Lateral Elements Research Articles

Synaptonemal complex protects double-Holliday junctions during meiosis.

Chromosomal linkages formed through crossover recombination are essential for accurate segregation of homologous chromosomes during meiosis1. DNA events of recombination are spatially and functionally linked to structural components of meiotic chromosomes2. Imperatively, biased resolution of double-Holliday junction (dHJ) intermediates into crossovers3,4 occurs within the synaptonemal complex (SC), the meiosis-specific structure that mediates homolog synapsis during the pachytene stage5,6. However, the SC's role in crossing over remains unclear. Here we show that SC promotes crossover-specific resolution by protecting dHJs from unscheduled and aberrant resolution. When key SC components are conditionally inactivated during pachytene, dHJs are resolved into noncrossover products by Sgs1-Top3-Rmi1 (STR), the yeast ortholog of the human BLM complex7. Cohesin, the core component of SC lateral elements, plays a primary role in chromatin organization and is required to maintain both SCs and crossover recombination complexes (CRCs) during pachytene. SC central region component Zip1 is required to maintain CRCs even when dHJs are stabilized by inactivating STR. Reciprocally, SC stability requires continuous presence of CRCs, an unanticipated interdependence with important implications for SC dynamics. In conclusion, through hierarchical and interdependent functions of its key components, the SC enables crossover-specific dHJ resolution and thereby ensures the linkage and segregation of homologous chromosomes.

Enhanced seismic performance: A novel cable brace with bending energy dissipation for semi-rigid steel frames

Ordinary braces upon experiencing compressive buckling, reach a fully plastic state, rendering them ineffective against further seismic action. Moreover, their post-earthquake repair and reinforcement pose significant challenges. Addressing these issues, this research introduces an innovative lateral force-resisting element: the bending energy dissipation-cable brace. This novel design utilizes steel cables in a unique tension-only arrangement, effectively dissipating seismic energy by inducing bending in a steel plate. A semi-rigid steel frame was constructed, incorporating two variations of the cable brace, differentiated by the thickness of their energy-dissipating frames. These were subjected to quasi-static cyclic loading tests to evaluate their hysteretic behavior, deformation pattern, load-bearing capacity decay, and energy dissipation capacity. The experimental results reveal the superior seismic performance of the bending energy dissipation-cable brace, evidenced by a 22 % enhancement in energy dissipation and a 38 % increase in stiffness when the thickness of the energy-dissipating frame is doubled. These results offer a promising solution to the current limitations in energy dissipation and difficulty of application of the combined brace of steel cable and bending yielding energy dissipation devices.

The Preservation Technique for Incomplete Unilateral Cleft Lip Reconstruction.

The incomplete unilateral cleft lip shares many of the same phenotypic characteristics as a complete unilateral cleft lip, but key differences include an intact nasal sill, a relative excess of skin in the lateral lip element, and favorable skeletal support. Surgical techniques for incomplete unilateral cleft lips should be tailored to the specific anatomical characteristics, be simple and reliable to perform, and minimize the risk of secondary deformity. Here we describe the "preservation technique" for incomplete unilateral cleft lip reconstruction. The modified design from the anatomical subunit approximation technique uses a nasal sill flap and obviates the need for nasal sill and lateral lip excision. Tissues of the lip are opened out and reorientated to maximize the anatomical advantage.

Investigation of the Contribution of First Row Rock Anchors to the Retaining System by Variation of Anchor Bond Length

In deep foundation excavations, inclined, prestressed soil/rock anchors are commonly used as lateral support elements. During the construction of multi-row anchored excavation systems, sometimes it may not be possible to manufacture anchors in the first row. This situation is often encountered in the production of rock anchors. The presence of discontinuities, karstic voids, and/or historical water channels in the rock environment where these anchors will be manufactured, hinders the injection of the anchor bond length. Additionally, the presence of hard rock units or igneous intrusions in the rock environment prevents the anchor hole from being drilled to the desired length. The application of anchors that could not be drilled to the desired length or those that could not achieve the desired quality of bond zone injection is canceled and usually left as an empty hole. In this study, the usability of canceled rock anchors in the first row, as at least anchors with a short bond length has been investigated. A rock anchor designed to support a 5.0-meter excavation pit to be created in a weathered rock environment, with a prestressing load of 500 kN and a bond length of 6.0 meters, was analyzed using Plaxis 3D software for situations with shorter bond lengths. Accordingly, the function of the related rock anchor can also be fulfilled by an anchor with a bond length of 4.0 meters. When the bond length is 4.0 meters, the entire anchor bond length operates at full efficiency. In anchors with bond lengths smaller than 4.0 meters, the prestressing load of 500 kN causes pull-out failure. However, for example, an anchor with a bond length of 2.0 meters continued to contribute to the overall stability of the retaining system under the effect of a prestressing load of 250 kN.

Analysis of Wind Load in a 15-Storey Building Using Various Lateral Load Resisting Techniques: A Review

Traditionally, outrigger and belt truss additions are used to strengthen the rigidity of tall buildings with central cores in order to control displacements. At the top of the structure, a single level outrigger can efficiently reinforce a building. The lateral stiffness of each outrigger level rises, although not as much as that of the top level. The primary lateral force-resisting elements of high-rise building structures are shear walls. Higher-performance shear walls are necessary because to the ever-increasing building code requirements and the rising height of high-rise and super high-rise structures. The conventional reinforced concrete shear wall is not very ductile, has a limited capacity to dissipate energy, and is not very deformable. Specifically, the base of a typical shear wall is particularly vulnerable to earthquake damage and is highly challenging to restore. In high-rise and super high-rise buildings, steel plate shear walls (SPSWs) and steel plate reinforced concrete composite shear walls (SPCSWs) are frequently used in place of regular reinforced concrete shear walls or shaped steel reinforced concrete composite shear walls to improve the seismic performance of building structures. Numerous structural methods seem to be able to withstand lateral stresses brought on by earthquakes, blasts, and wind. The more crucial it is to choose the optimal structural arrangement to counteract opposing horizontal loads. Keywords— High-rise structure, Outrigger, Shearwall, Damper etc.

Medaka Terb1 Mutant Displays Defects of Synaptonemal Complex Formation and Sexual Difference in Gametogenesis.

Formation of the synaptonemal complex (SC) is a prerequisite for proper recombination and chromosomal segregation during meiotic prophase I. One mechanism that ensures SC formation is chromosomal movement, which is driven by the force derived from cytoskeletal motors. Here, we report the phenotype of medaka mutants lacking the telomere repeat binding bouquet formation protein 1 (TERB1), which, in combination with the SUN/KASH protein, mediates chromosomal movement by connecting telomeres and cytoskeletal motors. Mutations in the terb1 gene exhibit defects in SC formation in medaka. Although SC formation was initiated, as seen by the punctate lateral elements and fragmented transverse filaments, it was not completed in the terb1 mutant meiocytes. The mutant phenotype further revealed that the introduction of double strand breaks was independent of synapsis completion. In association with these phenotypes, meiocytes in both the ovaries and testes exhibited an aberrant arrangement of homologous chromosomes. Interestingly, although oogenesis halted at the zygotene-like stage in terb1 mutant, testes continued to produce sperm-like cells with aberrant DNA content. This indicates that the mechanism of meiotic checkpoint is sexually different in medaka, similar to the mammalian checkpoint in which oogenesis proceeds while spermatogenesis is arrested. Moreover, our results suggest that spermatogenesis is mechanistically dissociable from meiosis.

Modification of Noordhoff Flap for Tubercle Reconstruction in Unilateral Cleft Lip Repair

Background: Tubercle aesthetics are under-emphasized in unilateral cleft lip repair. Teenagers and adults with repaired cleft lip often display a central whistle deformity medial to the cleft lip scar. Lateral segment vermillion elements that are often discarded at the time of the initial repair can be used for tubercle reconstruction. Methods: We obtained anthropometric measurements of the dry vermilion around the central tubercle in neonates with unilateral cleft lip to determine the extent and morphology of deficiencies. A modification of the Noordhoff vermillion flap is proposed with a trapezoidal configuration to precisely match the measured, dry vermillion deficiency. Results: Photographic documentation illustrates the surgical technique and results. Conclusions: Tubercle reconstruction is described using a modification of the Noordhoff flap. Four-year results are encouraging. Observations through maturity are needed.

Comprehensive Evaluation of Lateral Performance of Innovative Post in Sand

Under environmental loads such as wind and earthquakes, piles are subjected to large lateral loads. A foundation system denoted Innovative Post (IP) that is composed of an H-pile shaft and one or two steel plates (paddles) welded to its flanges, has been developed to resist large lateral loads on sound wall systems. The present study evaluates the performance of IP installed in layered cohesionless soils through a comprehensive full-scale lateral load testing program and finite element (FE) analysis considering various pile and plate configurations. The developed FE model was validated employing the field test data and was then employed to conduct a parametric study to evaluate the performance of IP considering different paddles geometry (i.e., number of paddles, single or double, width, and length). The results demonstrated that adding the plates significantly increased the lateral capacity of H-piles. A positive relationship was identified between paddle’s width and length and the load efficiency. Optimal parameter values for paddles are established based on the experimental and numerical results proposed.

Improving the survivability of a railway bridge with damage to a truss members

In the modern era, accidents and damage to individual structural elements of bridges are frequently recorded, so the issue of bridges survivability, as the ability to pass the transport load with damaged elements, is becoming more and more relevant. The timeliness is confirmed by the inclusion of new requirements for survivability testing in modern bridge design standards. The article gives a publications review in the field of survivability theory development, identifies the methods of its increase in relation to transport structures and conducts research on increasing the railway bridges survivability. The research review in the field of assessment and increase of structures survivability as applied to transport structures allowed to single out the methods of survivability increase by providing bearing capacity of structures key elements, optimisation of spatial performance of a building structure and development of special organisational measures of emergency situation exclusion. With regard to the superstructure with through main trusses of a railway bridge with a design length of 66 m, numerical methods have been used to investigate the possibilities of increasing the reliability by increasing the bearing capacity of key elements. It has been established that the positive effect of increasing the survivability by excluding the bottom chord member and struts from operation gives an increase in the bearing capacity of the bottom lateral bracing and struts, respectively. It is revealed that the most dangerous is the exclusion from operation of the upper chord truss members, and the bearing capacity increase of the key lateral bracing elements, as well as the increase of the degree of static indeterminacy of the lattice of links is ineffective. Organisational measures in case of damage and failure of the span truss element are proposed.

LOAD-BEARING TIMBER DSF ELEMENTS INFLUENCE ON RACKING STABILITY OF MULTI-STOREY PREFABRICATED TIMBER BUILDINGS

Application of double-skin façade (DSF) elements is an important approach in a designing process of contemporary multi-storey timber buildings. A double-skin facade is an envelope wall element that consists of two glass components separated by a cavity and can essentially improve building-physics properties of building envelope. In a sense to reduce global warming potential (GWP) an ecological solution with a timber frame is presented in this paper. Recently, many studies have analyzed thermal and acoustic performance of DSF elements, but practically none in a sense of structural behavior, especially in determination of racking resistance of such wall elements. Because costs of experiments performed on such full-scale DSF elements are very high and such experiments are also very time-consuming, a special mathematical model using a Finite Element Method (FEM) for analyzing the racking resistance and stiffness was further developed. Finally, a specially selected four-storey timber-framed building is subjected to a seismic analysis comparing the influence of the developed timber DSF elements on the overall racking behavior of that structure with non-resisting DSF function. It is demonstrated in the presented study on the selected case that the racking resistance (R) and a consequent seismic resistance of a whole building can be essentially improved if DSF elements are considered as lateral load-bearing wall elements. Consequently, such an approach by using DSF elements as additional bracing wall elements can essentially further increase a potential of designing also high-rise timber buildings with asymmetric position of transparent areas.

The N-terminal modification of HORMAD2 causes its ectopic persistence on synapsed chromosomes without meiotic blockade.

The dissociation of HORMA domain protein 2 (HORMAD2) from the synaptonemal complex is tightly regulated. This study reveals that the N-terminal region of HORMAD2 is critical for its dissociation from synapsed meiotic chromosomes. During meiosis, homologous chromosomes undergo synapsis and recombination. HORMA domain proteins regulate key processes in meiosis. Mammalian HORMAD1 and HORMAD2 localize to unsynapsed chromosome axes but are removed upon synapsis by the TRIP13 AAA+ ATPase. TRIP13 engages the N-terminal region of HORMA domain proteins to induce an open conformation, resulting in the disassembly of protein complexes. Here, we report introduction of a 3×FLAG-HA tag to the N-terminus of HORMAD2 in mice. Coimmunoprecipitation coupled with mass spectrometry identified HORMAD1 and SYCP2 as HORMAD2-associated proteins in the testis. Unexpectedly, the N-terminal tagging of HORMAD2 resulted in its abnormal persistence along synapsed regions in pachynema and ectopic localization to telomeres in diplonema. Super-resolution microscopy revealed that 3×FLAG-HA-HORMAD2 was distributed along the central region of the synaptonemal complex, whereas wild-type HORMAD1 persisted along the lateral elements in 3×FLAG-HA-HORMAD2 meiocytes. Although homozygous mice completed meiosis and were fertile, homozygous males exhibited a significant reduction in sperm count. Collectively, these results suggest that the N-terminus of HORMAD2 is important for its timely removal from meiotic chromosome axes.

Seismic Response of Stiffness Irregularity at Ground Floor with and without Shear Walls

In today's scenario, one of the greatest challenges for structural engineers is designing and constructing seismic-resistant structures. Seismic activity, or earthquakes, poses a significant threat to civil engineering structures, and ensuring that buildings can withstand the forces generated during an earthquake is crucial for public safety and infrastructure resilience. Irregular configurations, whether in the building's floor plan or its elevation, are widely acknowledged as significant contributors to failure during seismic events. These irregularities can lead to uneven distribution of forces and stresses, compromising the building's ability to withstand the seismic forces and potentially resulting in structural failure. Soft storeys, typically located at ground levels for various functional purposes, pose challenges in seismic regions due to their lack of sufficient lateral load-resisting elements resulting in excessive lateral deformation and collapse during intensive earthquakes. Hence, the present study investigated the seismic response of irregular reinforced concrete structures possessing stiffness irregularity at ground floor with and without shear walls. A ten-storey regular frame is modified by incorporating vertical irregularity in elevation by increasing the height of the ground floor. The complete structural analysis and modeling are carried out by using the software ETABS 2020. The Time History method is applied, and the study is focused on seismic zones V in India. The performance of structures are compared based on criteria such as storey displacement, storey drift, storey shear and overturning moment. The results lead to the conclusion that a building structure exhibiting stiffness irregularity is prone to instability which is indicated by higher displacement and drift values. Structures incorporating shear walls have demonstrated greater stability compared to structures without shear wall as they exhibited higher base shear values and experienced a reduction in lateral displacement by more than 40%. The presence of shear walls also has enhanced the stability and strength of the structure, showing a linear response during critical earthquakes.

Multiple reorganizations of the lateral elements of the synaptonemal complex facilitate homolog segregation in Bombyx mori oocytes.

Although Lepidopteran females build a synaptonemal complex (SC) in pachytene, homologs do not crossover, necessitating an alternative method of homolog conjunction. In Bombyx mori oocytes, the SC breaks down at the end of pachytene, and homolog associations are maintained by a large oocyte-specific structure, which we call the bivalent bridge (BB), connecting paired homologs. The BB is derived from at least some components of the SC lateral elements (LEs). It contains the HORMAD protein HOP1 and the LE protein SYCP2 and is formed by the fusion of the two LE derivatives. As diplotene progresses, the BB increases in width and acquires a layered structure with a thick band of HOP1 separating two layers of SYCP2. The HOP1 interacting protein, PCH2, joins the BB in mid-diplotene, and by late-diplotene, it lies in the middle of the HOP1 filament. This structure is maintained through metaphase I. SYCP2 and PCH2 are lost at anaphase I, and the BB no longer connects the separating homologs. However, a key component of the BB, HOP1, remains at the metaphase I plate. These changes in organization of the BB occur simultaneously with the movement of the kinetochore protein, DSN1, from within the BB at mid-diplotene to the edge of the homologs facing the poles by metaphase I. We view these data in context of models in which SC components and regulators can be repurposed to achieve different functions, a fascinating example of evolution achieving homolog conjunction in an alternative way with recycling of SC proteins.

3D FE modeling of a complex multi-stage foundation underpinning for a high-rise building

ABSTRACT The piled foundation of an existing high-rise building in Cairo was assessed as inadequate. The building foundation consists of 370 piles arranged below the columns and walls. The building was constructed in 1977, and up to the start of this investigation in 2014, it was just a concrete skeleton without finishing. The existing foundation was subjected to underpinning in 1985 using micropiles to support new lateral load-resisting elements proposed by the project structural consultant. According to the new Egyptian codes of practice, underpinned foundations are still considered inadequate and it was proposed to add additional micropiles with a raft connecting the different pile groups. This paper presents the 3D FE modeling for this complex multi-stage foundation underpinning considering the construction sequence and the different interactions between the original piles, existing and proposed groups of micropiles, supporting soil and the capping raft. The load transferred by direct contact between the raft and the soil is also investigated. Available detailed geotechnical investigation and evaluation of the available micropiles loading tests were used to estimate the parameters of soil and pile−soil interface. The advanced 3D FE model is used to ensure that the proposed number of additional micropiles satisfies the required safety and stability. The outcome of the analysis proved to conservatively satisfy safety requirements. The raft transferred a considerable part of the total load directly to the soil, hence increasing the capacity of the combined piled raft foundation system.

FEATURES OF THE CREATION OF THE MACLURA TRICUSPIDATA (CARRIÈRE) BUREAU COLLECTION PLANTING IN THE CONDITIONS OF THE KHOROL BOTANICAL GARDEN

An introductory study of Maclura tricuspidata (Carrière) Bureau in the Khorol Botanical Garden is shown. It is singled out as an important stage of the creation of a collection plantation, which is used to establish the degree of stability of the species in new conditions of growth and the prospects of its distribution and cultivation both in the research region – in the Poltava Region, and in the natural and climatic zone - the Forest Steppe of Ukraine.
 It is noted that in the process of developing plants, seeds soaked for one day were sown in a nursery with a substrate of one part of the soil and two parts of river sand, where the soil fertility was about 40%, and the growth during the growing season was 15–20 cm. After growing, the seedlings were grafted by the method of improved copulation and split into the varieties ‘Che Seedless’, ‘Norris’ and pollinator. Grafting was done in the root neck, which allowed the seedling to be transplanted to a permanent place of growth in a botanical garden with a depth of 15 cm at the site of grafting into the soil in order to preserve varietal characteristics in case of loss of the aerial part of the plant due to damage by frost with critical sub-zero temperatures for the species.
 The expediency of protecting the root system from the effects of low temperatures in the cold season, when the lower part of young plants and the circle around the stem are covered with a thick layer of fallen leaves, and with this agrotechnical method, the soil around the root system does not freeze to depth, which has a positive effect on the state of wintering - plants do not freeze.
 For visual identification by external features of the M. tricuspidata samples available in the collection, photofixation of the leaves, linear measurements of the leaf blade and spines as lateral elements of the shoot, and description of the shape of the leaf blade were made.
 In this way, a collection plantation of M. tricuspidata was established using the varieties of foreign selection ‘Che Seedless’, ‘Norris’, their pollinator and seedling form. Further enrichment of the collection with a variety of introductory material will contribute to the successful implementation of selection research tasks on the selection of local resistant forms.

The comparison of X-braced frame and moment frame on structural building (case study: government office of North Toraja, South Sulawesi, Indonesia)

The seismic force can damage the building and harm the occupants. Therefore, its structure needs to be designed seismic-resistant. One of the essential things in seismic-resistant building is the effect of lateral force to its structural rigidity. It can be improved by using the lateral resistant element such as bracing and shear wall. The lateral element used in this study is concentric X-bracing. This study conducted an optional structural model of the office of North Toraja Regent, Panga, South Sulawesi. The building was originally analyzed as a whole unit structure, but it has already rotated in its first mode shape due its irregularity. The comparison analysis is conducted by using the same existing structure configuration, except with the addition of X-bracing. The analysis results of the dynamic response are the fundamental building period, mode shape, base shear, lateral displacement and P-delta effect. The fundamental building period using X-bracing is smaller than moment frame building. It indicates that the use of X-bracing lead to the stiffer building. The use of the X-bracing results in a larger base shear value than the moment-frame building. The difference in base-shear between X-braced frame with moment frame is about 211.77% and 212.10% for seismic force with X-direction and Y-direction respectively.

Rationale for white skin roll flap in unilateral cleft lip repair: A retrospective anthropometric measurement analysis

Although the "white skin roll" of the lip is often considered a line, it is better defined as the subunit between the vermilion border and the upper lip horizontal groove. In many unilateral cleft lip repair techniques, this structure is approximated between both sides of the cleft without restoration. This study aimed to analyze the white skin roll height in patients with unilateral cleft lip. This retrospective cohort study included 134 consecutive infants with unilateral cleft lip aged 3-6 months who underwent lip repair in a single institution between January 2019 and July 2021. White skin roll heights at the peak of the Cupid's bow on the non-cleft side (CPHIR), cleft medial element (CPHIL), and cleft lateral element (CPHIL') were measured, and differences in their averages were analyzed. The mean height was 1.70±0.30mm at CPHIR, 0.98±0.33mm at CPHIL, and 1.28±0.32mm at CPHIL.' The mean difference in height between CPHIR-CPHIL, CPHIR-CPHIL,' and CPHIL-CPHIL' groups was significant for each paired sample (p<0.01). No difference was found between the complete and incomplete clefts or left and right clefts (p>0.01). A significantly reduced mean height of the white skin roll was present more markedly on the cleft medial element than on the cleft lateral element. Therefore, we strongly support using a white skin roll flap on the cleft lateral element for unilateral cleft lip repair, embracing the concepts of subunits and lip contour lines.

Self-centric cyclic resistance of reinforced concrete shear wall with Shape Memory Alloy: Numerical and experimental large-scale model

Over several decades, numerous researches have been routed to forge ahead in enhancing the building performance against dynamic loads. Nowadays, smart materials such as Shape Memory Alloy (SMA) have found profound impact in many applications of civil engineering. Nickel titanium alloy (NiTi) is one of the most famous among types of SMA. The current paper studies the behavior of shear wall, representing one of the most efficient lateral bracing element, structured by NiTi subjected to cyclic loading. Due to the unique characteristics of NiTi particularly in capacity to restore its original shape after unloading, the improvement in shear wall displacement recovery, wall ductility, hysteric behavior and inter-story drift ratio is presented. For this purpose, experiment study on large scale shear walls with aspect ratio 1.9 is conducted to investigate the effect of the intensity of NiTi on cyclic response. Two ordinary walls, as reference structures, and two hybrid walls are set up in order to perform the study. In addition, the validation of numerical simulation is examined by comparing its results with that obtained by the experiments and a pretty much in agreement is found. Hence, three-dimensional modeling by mean of ANSYS19 is extended to study the effect of NiTi length throughout the wall height on the shear wall response. The results showed that the existing of NiTi controls the cracks propagation and confines the majority in the lower third of the wall. Furthermore, for NiTi-wall, the study showed remarkable enhancement in recover capacity by 77 % and significantly increase in drift capacity ratio by 16.5 % relies on the NiTi ratio. Besides, some significant observations like the profile of wall curvature and energy dissipation are analyzed in this paper.

Compact beamforming network for producing multiple orthogonal beams in a limited field of view phased array antenna

AbstractDue to the advent of high-throughput communication satellites in a geostationary orbit, the development of multiple beam phased array antenna (MBPAA) technology has become a necessity. This paper presents the design and implementation of the constituent unit of a beamforming network (BFN), which feeds an MBPAA with interleaved sub-arrays. The proposed BFN generates multiple orthogonal sub-beams with a very tiny angular distance between adjacent sub-beams in a limited field of view. The BFN consists of sub-array beamforming networks (SABFNs) with unequal number of beam ports and antenna ports, which can feed both the arrays lateral elements and the interleaved core sub-arrays for pattern shaping and side-lobe level reduction. A microwave circuit for this SABFN has been designed and fabricated in C-band. The microstrip lines have been printed on the two sides of a suspended substrate. This technique leads to size reduction of the circuit by twice a value compared to a conventional microstrip circuit. Measurements have been compared to simulations, and good conformity has been observed. The insertion loss in the path of beam ports to the antenna ports is 3.5 dB for a relative bandwidth of 10%.

Seismic Performance of SFRC Shear Walls with Window Opening and the Substitution Effect for Steel Bars

Shear walls are important vertical and lateral bearing element in structures. While shear walls with openings are fragile due to stress concentration and the quasi-brittle behavior of concrete in tension. Therefore, additional strengthening rebars are required for the shear walls with openings. However, it aggravates the problem of dense reinforcement which increases the steel cage manufacturing and concrete compaction problem and still lacks countermeasures against concrete damage and cracking. To reduce the rebar demand and improve the damage tolerance of squat reinforced concrete (RC) shear walls with openings, an optimized steel-fiber-reinforced concrete (SFRC) was adopted to understand the seismic performance by cyclical loading test. The tested specimens included a plain RC shear wall without strengthening bar around the opening (for comparison), an SFRC shear wall, and an SFRC shear wall with a reduced distributed steel bar. This paper mainly studies the effect of using SFRC to improve the seismic performance of the open shear wall and to replace the reinforcement around the opening and the shear reinforcement. The hysteresis curves, skeleton curves, stiffness degradation, bearing capacity degradation and energy dissipation of the specimens were analyzed. The results show that the failure can be delayed and relieved, the deformation capacity and energy dissipation can considerably improve, and rebars can be partially replaced by using SFRC.