Bridge Connection Research Articles

Load Sensitivity Correlation Factor-Based Steady-State Power Flow Allocation Method for Independent DC Bus Structure Multiport Power Electronic Transformer

The independent DC bus structure multiport power electronic transformer (IDBS-MPET) is a novel power electronic transformer designed to integrate multiple DC sources and DC loads. Due to the configuration of DC ports, which are directly constructed by the parallel connection of dual active bridge (DAB) converters, the distribution of DC sources and DC loads among the three phases becomes unbalanced. In cases where the load power at certain ports is too high, this imbalance may lead to the over-modulation of the front-end H-bridge (HB). Since the output power at a certain port in the IDBS-MPET is constrained by the loads at other ports, this paper proposes a multiport steady-state power flow allocation method. This method establishes the load sensitivity correlation factor to enable all the ports to adjust power cooperatively based on it. By applying the proposed steady-state power flow allocation method, iterative calculations continuously update the priority of all the ports and their load sensitivity correlation factors. This process ensures that the power flow converges to a steady-state solution. Simulation results for two different IDBS-MPETs demonstrate that the power flow at all the ports effectively meets load requirements, while the front-end HB avoids over-modulation, ensuring the safe and stable operation of the IDBS-MPET. The results validate the effectiveness of the proposed steady-state power flow allocation method.

Determination of stresses in welded connections of railway bridges with the finite element method and global-local approach

Steel bridges are used due to their large spans with reduced self-weight, and therefore, are widely used for expanding the Brazilian railway network. However, due to the cyclic loading acting on the structure, and their limited damping capacity, the dynamic effects must be evaluated. In addition, due to the cyclic loading, the effects of fatigue must be considered. In bridges, fatigue failures account for most of the damage and collapse of structures. Thus, techniques are proposed for assessing their service life, considering fatigue failure effects. Fatigue life assessment can be performed considering the history of stresses acting on the structure, and obtaining stress history data using the finite element method yields more accurate results compared to normative methods, but it requires an extremely refined mesh to obtain adequate stress values. Therefore, this study presents a strategy for obtaining stress histories with the passage of a vehicle on a railway bridge using the commercial software Ansys Mechanical APDL v. 2020R1 and Python routines to assess the fatigue life of connections. A global-local methodology is proposed, in which a model of a bridge span using shell and beam elements is developed and subjected to the passage of a vehicle. Its displacement results are then transferred to a local connection model developed with solid elements, to determine stresses for future use in assessment of fatigue life.

Research on the Construction Mechanics and Stability Control Technology of Expressway Tunnel Based on Numerical Analysis

As an effective structural form, connecting arch tunnel has been widely used in practical engineering because of its smooth linear shape, small footprint and good bridge and tunnel connection. With the increase of domestic traffic volume year by year, the width of the even arch tunnel is gradually changed from two-way four lanes to two-way six lanes. I20 I-steel, spacing 0.75∼1 m, anchor length 3∼4 m, ring spacing 0.5∼1 m, the side ring spacing of the middle wall is 0.75 m, the side ring spacing of the side wall is 1 m, and the shotcrete thickness is 0.25∼0.3 m. The excavation span of a two-way six-lane continuous-arch tunnel is considerable, leading to complex stress characteristics, thereby posing risks to construction safety and structural stability. Following the construction of the initial tunnel, disturbance to the surrounding rock occurs, affecting subsequent excavation phases. The initial support requirements for subsequent excavations are more intricate, with increased internal forces compared to the initial tunnel segment. As the rear tunnel progresses, the surrounding rock near the middle wall shifts towards the rear tunnel, reducing internal forces in the concrete and steel arch frame. However, as the rear tunnel distance increases, concrete stress and axial forces on the middle wall side of the initial tunnel begin to rise. Throughout the construction, the steel arch frame’s internal forces and spray concrete stress on the middle wall side’s arch waist and foot are the highest, making them susceptible to disruption from construction on the opposite side, thus constituting critical tunnel components. Numerical simulations effectively capture surrounding rock and structural stress dynamics during large-span arch tunnel construction. Simulation outcomes align closely with field measurements, particularly in three-dimensional simulations, enhancing construction understanding and management.

Unified analytical theory of nonlinear optical diffraction by nonlinear gratings

When a pump laser shines upon a periodically poled lithium niobate (LN) thin plate nonlinear grating, second-harmonic generation (SHG) and its nonlinear diffraction occurs, with the nonlinear Raman–Nath diffraction (NRND), nonlinear Bragg diffraction (NBD), and nonlinear Cerenkov radiation (NCR) being several prominent examples. In this work we build and present a unified analytical theory to solve SHG for the NRND, NCR, and NBD processes from LN domains, domain walls, and defects. We find that the critical physical entity that governs the nonlinear diffraction is the effective nonlinear coefficient for each Fourier wave component. The analytical theory has a great generality and applicability scope. It allows us to retrieve and analyze everything about the dependence of SHG nonlinear diffraction on a series of physical and geometrical parameters such as the pump laser intensity, polarization, incidence polar and azimuthal angles, the LN thin plate thickness and its crystalline orientation, LN domain size and pitch, domain wall thickness and crystalline configuration, defect size and crystalline configuration, and the SHG diffraction beam angle and polarization. The analytical theory also enables us to analyze deeply the similarities and differences of the three nonlinear diffraction processes NRND, NCR, and NBD, build a smooth and broad connection bridge among these three processes, and construct a unified physical picture to understand, describe, and exploit these three processes of seemingly big difference. Besides, the analytical theory can be applicable to handle nonlinear diffraction by domains, domain walls, and defects in other more complicated 2D and 3D nonlinear gratings made from LN and other nonlinear crystals. Finally, the analytical theory can help to build a bridge connecting the extrinsic SHG nonlinear diffraction properties with the intrinsic domain poling and inversion material and physical properties of LN and other nonlinear crystals and explore novel nonlinear optical devices and technologies.

Ritual Meals of Chaṭha: Exploring Gastronomical Activities in a Religious and Festive Setting

Festivals and rituals have been pivotal for transmitting and preserving cultural values, with food assuming a central role in these communal observances. This study delves into the intricate interplay between culinary practices, cultural identity, and religious expression by examining the Hindu festival of Chat.ha. The investigation centers on the multifaceted nature of Chat.ha. By closely examining the processes of procurement, preparation, offering, and consumption of ritualistic foods during the festival, this research looks into how these gastronomic traditions contribute to fostering a sense of unity, highlighting cultural heritage, and intertwining between religious beliefs and societal norms. Exploring the culinary landscape of Chat.ha unveils the profound religious and sociocultural dimensions inherent in food-related practices, emphasizing how the daily act of sustenance transforms into a bridge for religious connection and collective bonding. Based on our fieldwork in Varanasi (Uttar Pradesh), Patna (Bihar), and Sahibganj (Jharkhand), we document several aspects of the festival food of Chat.ha and how they offer a window into the many culinary customs of societies, emphasizing the connections between food and cultural identity, interpersonal interactions, and religious beliefs.

Implementation of the Infrastructure Policy in the Construction of the Bridge Connecting Gampong Blang Mirou--Kumba Kec. Bandar Dua, Pidie Jaya Regency

Due to the lack of connecting facilities, residents in the Gampong Blang Mirou and Kumba Kec. Bandar Dua have to travel via another route. Although proposals to the district government are submitted every year, a response was received in 2018. In 2018, the construction of the Blang Mirou–Kumba steel truss bridge was carried out using the DAK budget, the tender process for this development package used a budget of 14 billion Rupiah. The purpose of this research is to determine and analyze the increase in social interaction and economic growth as a result of the construction of the bridge connecting Gampong Blang Mirou - Kumba District. Bandar Dua Kab. Pidie Jaya. The method used is descriptive qualitative. The data sources used are primary data and secondary data. The research uses data obtained through interviews, observation, and documentation. Based on the results of the research and findings in the field, the conclusion is that the implementation of this policy can provide practical implications for the people of Pidie Jaya Regency, especially the people of Gampong Blang Mirou and Gampong Kumba as well as the Pidie Jaya Regency Government so that social interaction between the regions and the regional economy both increases. An interesting finding was that when the road was widened to build a connecting bridge, the community gave their land for free without having to be compensated by the government. Keywords: policies, infrastructure, bridges, socio-economic community

Centrality and bridge connections between cognitive emotion regulation strategies and professional identity among Chinese undergraduate nursing students: A network analysis

AimTo construct a network structure for cognitive emotion regulation among Chinese undergraduate nursing students and identify central nodes and to explore the bridge connections between cognitive emotion regulation strategies and professional identity from the perspective of network analysis. BackgroundUndergraduate nursing students are currently in a poor psychological condition and cognitive emotion regulation strategies can help them use positive approaches to regulate their emotions. There may be a link between cognitive emotion regulation strategies and professional identity. DesignThis was a cross-sectional study that used network analysis. MethodA total of 218 Chinese undergraduate nursing students were selected and surveyed using the Cognitive Emotion Regulation Questionnaire and the Professional Identity Questionnaire. A network analysis model was constructed and the related indices were calculated using R 4.3.0 software. ResultsNetwork analysis showed that the central nodes of undergraduate nursing students’ cognitive emotion regulation strategies were positive reappraisal, refocusing on planning and catastrophising; In the bridge network of cognitive emotion strategies and professional identity, professional self-concept, positive reappraisal, benefits of stay and risk of resignation and refocusing on planning were the nodes with the strongest bridge strength. ConclusionThe salient central and bridge nodes can serve as potential targets for interventions aimed at improving the mental health of undergraduate nursing students. Nursing educators must be trained in cognitive emotion regulation and appropriately guided to use positive emotion regulation strategies in their studies and work. Educators should focus on the relation between cognitive emotion regulation and professional identity to improve the mental health of nursing students and stabilise the nursing workforce.

Plastic Limited Numerical Modelling on Contact Friction Effects of Steel–Concrete Connection for Composite Bridges

This research employs plastic limit analysis to examine load combinations, contact interactions, and friction effects on steel–concrete connections. A nonlinear finite element model was developed using ABAQUS 2021, incorporating the concrete damage plasticity model and contact friction interactions. The model’s validity was confirmed through laboratory experiments. Results indicate that contact elements and friction between the top flange, concrete slab, and studs significantly influence structural behavior. Unlike conventional push-out tests, real deck–slab connections exhibit different load-displacement responses due to the self-weight and additional loads, such as vehicular traffic. Under horizontal loading, extensive failures with large deformations along the studs occur, while vertically compressive loads lead to failures around the connections.

An improved bridge reference network for 3-D SAR tomography based on regional growing strategy

ABSTRACT The utilization of synthetic aperture radar tomography (TomoSAR) technology for the three-dimensional imaging of urban areas has garnered significant attention. In the case of multi-pass spaceborne TomoSAR, eliminating the atmospheric phase screen (APS) is a critical step. At present, a two-tier network method is widely employed for APS removal from extensive regions. However, challenges persist in the construction of first-tier reference networks using the Delaunay triangulation and bridge reference network methods, such as low network coverage ratios and linear correlation problems associated with near-parallel bridges. Consequently, a notable portion of the inversion results for buildings or artificial structures are either absent or characterized by low accuracy. To fully harness the observational information from all small connecting networks, this study introduces an improved bridge reference network construction method based on a region-growing strategy. This method merges small subnetworks with surrounding reference networks using high-quality bridge connections to maximize the coverage of the largest reference network. To validate the feasibility and effectiveness of the proposed approach, 27 TerraSAR-X images, which were collected in Shenzhen, China were utilized to construct a reference network and estimate building heights. The results clearly indicate that the proposed method effectively overcomes the limitations of existing methods.

Optimizing Seismic Design of Multi-Tower Buildings Using Sky Bridge Isolation and BIM: A Case Study

This research aims to extend prior knowledge of sky bridge isolations in a design case study that complies with building codes, focusing on the design of a multi-tower building linked with a sky bridge and its isolation system. Building Information Modeling (BIM) is used during the design process. Linear time history analysis is performed to capture seismic responses without statistical distortion of response combinations. Link elements are used to simulate the isolations, and the ground motions are excited in bidirectional directions. The experimental results demonstrate that using an isolation system at the sky bridge connection improves torsional behavior, as evidenced by a 12% reduction in torsional mass contribution in the fundamental mode shape of the buildings. Other notable improvements include better lateral force distributions and optimization of reinforcement volume by 36.91% at maximum. Additionally, convenient post-design procedures, such as automated design visualizations and quantity surveys of reinforcements are reported through using BIM.

Impact of anti-corrosion coatings and maintenance on high-strength bolt friction connections in C4 marine environment

High-strength bolt friction connections (HSBFCs) in steel constructions often employ exterior anti-corrosion coatings, and some connections in steel bridges extend these coatings to their friction surfaces. However, previous studies on HSBFCs have overlooked the influence of external anti-corrosion coatings and coatings on friction surfaces. This research investigates the impact of internal and external anti-corrosion coatings on shear performance through experimental testing. Shear tests were conducted on 43 connections under 17 different conditions, varying the presence of anti-corrosion coatings on friction surfaces and external coatings, including conditions of construction and maintenance. Calibration tests revealed varying anti-slip coefficients: sandblasted surfaces measured 0.44, below specification; epoxy zinc-rich primer coatings measured 0.27; and alcohol-soluble inorganic anti-rust primers measured 0.50, both meeting or exceeding specifications. Simulated C4 atmospheric corrosion environments and dry-wet alternating copper accelerated acetic acid salt spray tests were performed. Results indicate predictable indoor corrosion acceleration and significant shear capacity degradation (4.9 % to 19 %) despite external coating use. Coatings on friction surfaces delayed degradation, while external anti-corrosion coating effectiveness declined post-construction and maintenance. Analysis shows shear capacity degradation in unprotected connections was 1.5 to 1.8 times higher than protected counterparts, attributed to reduced anti-slip coefficients and bolt pre-tension loss.

Syntheses and Applications of Coumarin-Derived Fluorescent Probes for Real-Time Monitoring of NAD(P)H Dynamics in Living Cells across Diverse Chemical Environments.

Fluorescent probes play a crucial role in elucidating cellular processes, with NAD(P)H sensing being pivotal in understanding cellular metabolism and redox biology. Here, the development and characterization of three fluorescent probes, A, B, and C, based on the coumarin platform for monitoring of NAD(P)H levels in living cells are described. Probes A and B incorporate a coumarin-cyanine hybrid structure with vinyl and thiophene connection bridges to 3-quinolinium acceptors, respectively, while probe C introduces a dicyano moiety for replacement of the lactone carbonyl group of probe A which increases the reaction rate of the probe with NAD(P)H. Initially, all probes exhibit subdued fluorescence due to intramolecular charge transfer (ICT) quenching. However, upon hydride transfer by NAD(P)H, fluorescence activation is triggered through enhanced ICT. Theoretical calculations confirm that the electronic absorption changes upon the addition of hydride to originate from the quinoline moiety instead of the coumarin section and end up in the middle section, illustrating how the addition of hydride affects the nature of this absorption. Control and dose-response experiments provide conclusive evidence of probe C's specificity and reliability in identifying intracellular NAD(P)H levels within HeLa cells. Furthermore, colocalization studies indicate probe C's selective targeting of mitochondria. Investigation into metabolic substrates reveals the influence of glucose, maltose, pyruvate, lactate, acesulfame potassium, and aspartame on NAD(P)H levels, shedding light on cellular responses to nutrient availability and artificial sweeteners. Additionally, we explore the consequence of oxaliplatin on cellular NAD(P)H levels, revealing complex interplays between DNA damage repair, metabolic reprogramming, and enzyme activities. In vivo studies utilizing starved fruit fly larvae underscore probe C's efficacy in monitoring NAD(P)H dynamics in response to external compounds. These findings highlight probe C's utility as a versatile tool for investigating NAD(P)H signaling pathways in biomedical research contexts, offering insights into cellular metabolism, stress responses, and disease mechanisms.

Epimuscular myofascial force transmission between nerve and myotendinous unit: A shear-wave elastography study

IntroductionEpimuscular myofascial force transmission can occur bidirectionally between muscles and nerves through a connecting neurovascular tract. The purpose of this study was to determine whether a neurodynamic stress test produces stiffness changes in the adjacent myotendinous complex. The authors also assessed which anatomical variables had an impact on elasticity changes provoked by the maneuver. MethodsA convenience sample of healthy adults (n = 39) recruited from a university population who met the inclusion criteria participated voluntarily in this study. Using Shear-Wave elastography, stiffness data were obtained for the ulnar nerve, flexor carpi ulnaris tendon and muscle before and after a neural tensioning maneuver. ResultsFollowing an ulnar nerve stretch, statistically significant differences were obtained in neural stiffness increase in nerve (p < 0.001), tendon (p < 0.001) and muscle (p = 0.046), with a moderate (d = 0.538), small (d = 0.485) and small (d = 0.224) effect sizes, respectively. The changes obtained were greater in those individuals with a smaller anatomical distance between nerve and tendon. ConclusionsAlterations in peripheral neural tissue tension involves elasticity changes in adjacent musculoskeletal tissue mediated by the neurovascular tract. Collateral force transmission was determined by the individual anatomical differences of each subject.Future research should assess whether the observed increase in myotendinous stiffness due exclusively to the passive transmission of force through the connective bridges between the two tissues studied or if there is a “neuroprotective” muscle contraction following neural stress.

Perceived functions and importance of digital media use and adolescent depression and suicidal ideation.

Although social media (SM) use is nearly ubiquitous among adolescents, there is a lack of clarity concerning the relationship between SM use and mental health outcomes like depression and suicidal ideation (SI), which increase during adolescence. Much of the previous literature has focused on the frequency of SM use; however, the current study examined the relationship between the perceived importance of three types of interactions and functions of SM use and depressive symptoms and suicidal ideation. A sample of 4057 adolescents (M age = 14.6; 47.0% girls; 69.0% Non-Hispanic/Latine White) were recruited via an online survey manager between February and March 2019. Participants completed the Adolescent Digital Technology Interactions and Importance (ADTI) Scale, which assessed the perceived importance of bridging online and offline experiences (bridging), going outside one's identity or offline experience (identity), and facilitating social connections (social). Participants also completed measures of depressive symptoms and SI and a self-report measure of SM use. A series of path analyses were conducted to examine the relationship between bridging, identity, social, and depressive symptoms and SI. After accounting for covariates (gender identity, racial identity, age, and SM use), bridging was negatively associated with depressive symptoms, whereas identity was positively associated with depressive symptoms. Bridging and social connection were negatively associated with SI, whereas identity was positively associated with SI. Gender moderated these relationships; however, racial identity did not. The results highlight the importance of understanding adolescent SM use beyond screen time in relation to depression and SI.

Maternal Depressive Symptoms and Offspring Internalizing Problems: A Cross-Lagged Panel Network Analysis in Late Childhood and Early Adolescence.

The present study investigated the relations between maternal depressive symptoms and internalizing problems in offspring during late childhood and early adolescence, examining sex differences using symptom network analysis. A total of 885 Chinese youths in late childhood (n = 497, 38.6% girls; age = 9.58 years, SD = 0.24) and early adolescence (n = 388, 48.5% girls; age = 11.30 years, SD = 0.24) and their mothers (Mage = 37.34 years, SD = 5.42) were recruited. Cross-lagged panel network (CLPN) analysis was used to explore bridge symptoms (i.e., symptoms connecting two or more mental disorders) and identify transmission pathways between maternal depressive symptoms and offspring's internalizing problems at these two developmental stages. The CLPN results revealed that in late childhood, the bridge connections in the network model were boys feeling worried to mothers feeling distractible, and girls feeling worried to mothers feeling powerless. In early adolescence, the bridge connections were boys experiencing depressed mood to mothers feeling powerless, and mothers feeling bad to girls experiencing depressed mood. These findings highlight the network-level relations between maternal depressive symptoms and offspring internalizing problems. They provide insights into the developmental differences and similarities in symptoms during these periods and suggest ways to break the vicious cycle of psychopathology between mothers and their children.

5G and IoT Bridging Connectivity with Security in the Age of Smart Devices&amp;quot;

5G and IoT Bridging Connectivity with Security in the Age of Smart Devices&amp;quot;

Analysis and Real-Time Monitoring of the Influence of Wind Load on a High-Altitude Steel Connecting Bridge with Small Spacing

With the development of steel-structure construction technology in high-rise buildings, the design and construction of high-rise steel structures tend to be complicated. Based on the Zhuhai Tiejian Square project, the fluid-structure coupling calculation analysis and on-site monitoring are carried out in view of the wind load of the high-altitude steel-structure connecting bridge in the hoisting stage of the Zhuhai Tiejian Square project. The main structure of the project is four towers and five high-altitude, small-spacing steel structures connecting the four towers. The lifting process of the third zone is taken as the analysis object, and the hoisting idea of “low-altitude hoisting, overall lifting” is adopted. Because the span of the high-altitude steel-structure connecting bridge is small and the installation height is high, the influence of wind load on the hoisting process cannot be ignored. Therefore, the unidirectional fluid-structure coupling model of the high-altitude small-space steel-structure connecting bridge in the third zone was established by using CFD calculation software ANSYS Fluent 2022 R1, and the corresponding flow field and solid calculation results were obtained and analyzed. The analysis results show that the lifting structure still produces a certain deformation when the wind speed is 5 m/s or 10 m/s, and the calculation results show that the stress calculation results are still within the safe range of steel strength for the sensitivity of the lifting structure under wind load. With the increase of wind speed, the local maximum stress of the structure increases greatly, but the overall deformation remains stable, which indicates that the greatest challenge of hoisting steel structures under wind load may be the stability direction rather than the strength, so it is necessary to strictly monitor the displacement deformation of the structure during construction. Then, through the monitoring of the overall lifting process of the high-altitude, large-span, steel-connected structure of Zhuhai Tiejian Square from pre-lifting to formal lifting, real-time monitoring and data analysis show that the lifting process of the high-altitude steel bridge of Zhuhai Tiejian Square is safe and reliable, the force transformation of each component is reasonable, the lifting process is relatively stable, the external environment has little impact, and the expected monitoring effect has been achieved. The calculation simulation and on-site monitoring in this paper can provide theoretical and practical guidance for the construction safety under the influence of wind load in the construction process of high-altitude steel-structure hoisting, and provide an important reference value for similar projects.

Complete phylogeny of Micrathena spiders suggests multiple dispersal events among Neotropical rainforests, islands and landmasses, and indicates that Andean orogeny promotes speciation.

The Neotropical region is the most diverse on the planet, largely owing to its mosaic of tropical rainforests. Multiple tectonic and climatic processes have been hypothesized to contribute to generating this diversity, including Andean orogeny, the closure of the Isthmus of Panama, the GAARlandia land bridge and historical connections among currently isolated forests. Micrathena spiders are diverse and widespread in the region, and thus a complete phylogeny of this genus allows the testing of hypotheses at multiple scales. We estimated a complete, dated phylogeny using morphological data for 117 Micrathena species and molecular data of up to five genes for a subset of 79 species. Employing event-based approaches and biogeographic stochastic mapping while considering phylogenetic uncertainty, we estimated ancestral distributions, the timing and direction of dispersal events and diversification rates among areas. The phylogeny is generally robust, with uncertainty in the position of some of the species lacking sequences. Micrathena started diversifying around 25 Ma. Andean cloud forests show the highest in-situ speciation, while the Amazon is the major dispersal source for adjacent areas. The Dry Diagonal generated few species and is a sink of diversity. Species exchange between Central and South America involved approximately 23 dispersal events and started ~20 Ma, which is consistent with a Miocene age for the Isthmus of Panama closure. We inferred four dispersal events from Central America to the Antilles in the last 20 Myr, indicating the spiders did not reach the islands through the GAARlandia land bridge. We identified important species exchange routes among the Amazon, Andean cloud forests and Atlantic forests during the Plio-Pleistocene. Sampling all species of the genus was fundamental to the conclusions above, especially in identifying the Andean forests as the area that generated the majority of species. This highlights the importance of complete taxonomic sampling in biogeographic studies.

Otoritas Pengetahuan Islam di Ruang Virtual: antara Inklusivisme dan Eksklusivisme bagi Pemustaka UIN Sunan Ampel Surabaya

Islamic authority continues into the era of information technology development, the most striking thing is the shift in authority in the current era. Virtual space has become a connecting bridge and producer of religious knowledge for Muslims. Every Muslim is their own authority, Muslims produce their religious understanding on each of their social media accounts. The question is whether religion in virtual spaces has lost its prominence in religious knowledge, or has this virtual world become a platform for spreading inclusive teachings. This research uses qualitative methods, by taking field data and then processing it with several theoretical perspectives. The result of the study in this research is that the presence of virtual space has given rise to a new typology of Islamic authority within the academic scope of UIN Sunan Ampel, namely virtual world Islamic authority

Family Environmental Risk and Perceived Stress in Adolescent Depressive Symptoms: A Network Analysis.

This study, grounded in the Process-Person-Context-Time framework, investigates the complex interplay of family environmental factors and their influence on adolescent depressive symptoms, focusing on the role of 'perceived stress'. Using network analysis, we examined data from 735 junior high students (52.1% female adolescents) from three provinces in China (Jiangsu, Shandong, and Henan), with an average age of 13.81 ± 0.92 years, ranging from 12 to 16 years, exploring the relationships between depressive symptoms, perceived stress, and seven family risk factors. The analysis identified three distinct communities. The incorporation of perceived stress led to its integration into a community that included depressive symptoms, parental restrictive monitoring, and family economic strain. Perceived stress emerged as the strongest predictor of depressive symptoms, surpassing parental restrictive monitoring. Furthermore, it overtook depressive symptoms as the node with the strongest bridging connection within its community. These findings underscore the importance of interventions targeting both family conditions and the internal processing of these stressors by adolescents, especially in challenging family environments, to mitigate the risk of depression and promote resilience.