Pylon Cable-stayed Bridge Research Articles

Experimental Study on the Steel-Concrete Composite Girder Joint of a Single Pylon Cable-Stayed Bridge

Hybrid girder cable-stayed bridges have been widely used around the world due to its advantages including the large-span viability of the main span with steel girder and the counterweight effect of the side span with concrete girder. The steel-concrete composite joint in hybrid girder cable-stayed bridges plays an important role in connecting the steel girder with the concrete girder and transferring the internal forces between two segments of different materials. Therefore, the performance and reliability of the composite joint is of great importance to such bridges. In order to examine the performance of the steel-concrete composite joint of a hybrid girder cable-stayed bridge with single pylon, a 1/4 scaled joint model was fabricated in the laboratory and static test was conducted. The stress distribution and the relative slip between concrete and steel under the combined action of axial force and bending moment were investigated. The test results showed that the maximum stresses of the steel and concrete components are within the allowable limits and the internal forces can be transferred smoothly between the steel girder and the concrete girder via the composite joint. The findings from this study provide useful reference and guidance for the design and testing of steel-concrete composite joints in hybrid girder cable-stayed bridges.

基于行波效应的矮塔斜拉桥抗震分析

基于行波效应的矮塔斜拉桥抗震分析

Estimation of Fatigue Life of Long-Span Bridge by Considering Vehicle- Bridge Coupled Vibration

To estimate the fatigue life of long-span steel bridge more accurately, this paper proposes a method for estimating the fatigue life of long-span bridges by considering vehicle-bridge coupled vibration. Firstly, the universal equation of vehicle-bridge vibration is derived based on triaxial standard multi-scale model of fatigue vehicle and bridge, and relevant program for vehicle-bridge coupled vibration is programmed. Secondly, a method for estimating the fatigue life of long-span steel bridge is proposed based on fracture mechanics theories, and the analysis process is expounded in details. Finally, the method for estimating fatigue life proposed in this paper is verified by taking a double pylon cablestayed bridge with orthotropic steel bridge deck slab as an example.

Data Interpretation and Continuous Modal Parameter Identification of Cable Stayed Bridge

For reliable identification of modal parameters, it is important to distinguish between abnormal data due to defects, malfunctioning, and anomalies in the sensors, from that of precise data. In case of long-term continuous monitoring data, it is imperative to identify any defects in the raw data very quickly and accurately to ensure that the identification is trustworthy. Exploratory Data Analysis (EDA) is employed for the purpose of quickly visualizing any defects and anomalies in the sensor’s data. Outlier analysis is employed to make some data treatment followed by auto and cross correlation to further elucidate any defects and anomalies in the collected data. Finally, covariance driven stochastic subspace identification (CO-SSI) with some improvements is employed to carry out the continuous modal parameter identification. The Sutong Yangtze river bridge, a long span Y-shape pylon cable stayed bridge with a main span of 1088m was chosen as a case study and the above proposed methods were applied. The result showed that the suggested method is very effective and can provide better and more accurate real life results in the continuous health monitoring of bridges.

Optimization of Stay Cables in the Double-Set Arch Pylon Cable-Stayed Bridge

The determination of post-tensioning cable forces is one of the most important issues for the design of arch pylon cable stayed bridge. In this paper, the optimization module implemented in MATLB, together with the commercial finite element software MIDAS, were employed to evaluate the minimum bending strain energy of the bridge. After optimizing the cable forces, the bending moment of the pylons were bigger than the values of original design. The bending moment of the main arch pylon within 55m to 70m height increased by 7280 kN•m, and the bending moment of the auxiliary arch pylon within 30m to 60m height increased by 3926 kN•m .The stress of the pylons was still far below the allowance value when the obtained cable forces were applied. However, for the girder, the difference between the maximum positive and maximum negative bending moments due to dead load can be lessened greatly by the application of the obtained cable forces. The results obtained revealed that the method presented could make full use of cable forces and lead to optimal structural performance.

Experimental study on pylon segment model of Sanguan Hanjiang low pylon cable-stayed bridge

Experimental study on pylon segment model of Sanguan Hanjiang low pylon cable-stayed bridge

Analysis on Vertical Swivel Construction of Cable-Stayed Bridge with Steel Arch Pylon

Single pylon cable-stayed bridge with its attractive appearance , economical advantages, become more and more widely. Vertical swivel construction of cable-stayed bridge with steel arch pylon has just begun in recent years. Similar to the construction of Bridges are rare in our country,so many of the key technologies and construction techniques remains to be further research and improvement. This project is to Gaoxin second road single pylon cable-stayed bridge as the engineering background, to research the key technologies of vertical swivel construction.

Finite Element Modal Analysis of the Cable-Stayed Bridge

In the process of modeling, ignoring the displacement of the pier directly replaced with fixed constraint, beam elements were adopted to simulate girder and pylon, and link elements were adopted to simulate the cable. The first ten order natural vibration mode and natural frequency were obtained, and the dynamic characteristics analysis of a single pylon cable-stayed bridge was discussed, which can provide certain reference and guidance for solving the problem of the cable-stayed bridge design.

Dynamic Characteristics of Pylon of Cable-Stayed Bridge with Inclined and Arched Tower during Construction

The structure of cable-stayed bridge with inclined and arched tower is complex and the force is complicated, especially the pylon, whose design and construction require detailed calculation and analysis. In case of the construction of Datong Nansanhuan Yuhe bridge project, in order to ensure the safety during its construction, the detailed construction plan was planned and the finite element model was established to analyse the dynamic performance of structure during construction of pylon. The result shows that, during the construction of low pylon, each frequency order of bridge structure is reduced to a steady level with the pylon completed gradually, and the low frequency changes moderately.

Research on Analysis Method of Seismic Response of Long Span Cable-Stayed Bridge

The response of the long-span cable-stayed bridges under seismic load is complex. Reasonable methods is very important to analyze the seismic performance. In this paper, a practical project is taken as research background which is double pylon cable-stayed bridge with main span of 416m. Two artificial seismic waves and two seismic records were selected to analyze the seismic behaviors by the response spectrum method, time history analysis method and power spectrum method. The result shows that seismic responses of the girder and main tower are basically identical under the effect of artificial seismic wave. The response spectrum analysis results of them are between the other two methods under the effect of the natural seismic wave. For stay cable, time history analysis results has great difference compared with results of other two methods. Therefore, different methods should be choosed base on specific circumstances to analyse the earthquake response of this structure.

Research of Loop Pre-Stress Tension Test for Cable-Stayed Bridge Pylon Based on Full-Scale Sectional Model

Based on full-scale sectional model experiment for cable pylon anchorage zone of cable-stayed bridge, this research tested the friction factor and deviation factor of the duct. The reason that tension elongation of loop prestressing tendon exceeded the provision of ±6% in specification was analyzed systematically. A correctional calculation formula was proposed, with quantitative analysis for influencing factors of tension elongation. The formula shows good applicability in practical engineering and has reference value for similar loop prestressing tendon.

Analyzing the Influence of Rigid Foundation on Seismic Response of Cable-Stayed Bridge Pylon

Bridges collapses triggered by the earthquake often happen in recent years, and bridge damage caused by the earthquake also results in the great effect due to the secondary disasters. In this paper, we use finite element analysis software ABAQUS to establish the bridge pylon model with rigid-framed pylon bottom to calculate the structural response of two seismic waves (modal analysis, displacement time history, acceleration time history and stress time history of the bridge pylon bottom), comparing the response characteristics of two pylon structures under seismic effect.

Full-Scale Model Test for Anchorage Zone of Pylon of Cable-Stayed Bridge

In this paper, the construction technology for main pylon of cable-stayed bridge is researched through test of full-scale model of anchorage zone of pylon of Guangzhou Bridge. Stress distribution and deformation condition of model under prestressed tendons and cable force are analyzed. Numerical simulation on this anchorage zone model is carried out. By comparing FEM results to the test results, some important conclusions are drawn out and give some advices to the optimum design of the bridge pylon. Parts of the achievements have been applied to actual bridge work and obtained successful engineering experience.

Huangpu Pearl River Bridge, China

The Huangpu Pearl River Bridge is a key project on the second ring highway of Guangzhou, which is the largest bridge in southern China. The total length of the bridge is 7049 m, including the northern approach bridge, northern channel bridge, central approach bridge, southern channel bridge and the southern approach bridges.The main bridge of the northern channel is a single pylon cable-stayed bridge with a main span of 383 m and steel box girder, which was constructed by balanced cantilever method. The main bridge of southern channel is a single span suspension bridge with a main span of 1108 m and steel box girder. This paper presents the tender design, the final design, the construction of the southern channel main bridge and the northern channel bridge including the foundation, pylon, main girder, main cable, main saddle and splay saddle.

Finite Element Analysis of Thermal Stress for Cable-Stayed Bridge Tower with Cracks

The application of ABAQUS in thermal stress analysis of mass reinforced concrete, focusing on the temperature field, crack propagation, ABAQUS modeling, finite element analysis approaches of thermal stress, is reviewed first in this paper. Then, based on the observation of one cable-stayed bridge pylon, a finite element analysis of existing crack tips in temperature stress is done, and the simulation results are compared with the measured ones to verify the validity and accuracy of the finite element calculation.

Full-Scale Segment Model Test and Stress Analysis of Abnormally Shaped Anchorage Zone of Cable-Stayed Bridge Pylon

The anchorage zone of pylon is the key part of the cable-stayed bridge, and it is also the difficult and important part in designing and construction of cable-stayed bridge. Especially for an abnormally shaped anchorage zone, it is hard to analyze the actual stress distribution on the bridge pylon by a simple mechanical method. The full scale segment model test of the abnormally anchorage zone of Maling River cable-stayed bridge pylon was described. In the test, the cracks, stress and deformation were observed and analyzed. Further more, the finite element analysis for the segment model was carried out. Through the contrast analysis between the model test and the finite element analysis, some important conclusions are drawn such as the model test and the finite element analysis have a good agreement, “the joints outside” and “the polyline inside” are the easy cracking zones, the cracking resistance coefficient of the model is no less than 1.3 and the destroy safety coefficient is no less than 1.6, which can provide important theoretical basis for the design and construction.

Full-Scale Segment Model Test and Stress Analysis of Abnormally Shaped Anchorage Zone of Cable-Stayed Bridge Pylon

The anchorage zone of pylon is the key part of the cable-stayed bridge, and it is also the difficult and important part in designing and construction of cable-stayed bridge. Especially for an abnormally shaped anchorage zone, it is hard to analyze the actual stress distribution on the bridge pylon by a simple mechanical method. The full scale segment model test of the abnormally anchorage zone of Maling River cable-stayed bridge pylon was described. In the test, the cracks, stress and deformation were observed and analyzed. Further more, the finite element analysis for the segment model was carried out. Through the contrast analysis between the model test and the finite element analysis, some important conclusions are drawn such as the model test and the finite element analysis have a good agreement, “the joints outside” and “the polyline inside” are the easy cracking zones, the cracking resistance coefficient of the model is no less than 1.3 and the destroy safety coefficient is no less than 1.6, which can provide important theoretical basis for the design and construction.

Model Test and Finite Element Analysis for the Pylon of the Jointed Pylon Cable-Stayed Bridge

In order to roundly investigate the whole structural behavior of the jointed pylon of cable-stayed bridge, 3:40 scaled-down model test and space finite element analysis （FEA） were presented by taking Yongjiang super-large bridge as an example. Test objective, model design principle, the ratio of similarity, test cases, loading method and the strain test point arrangement were introduced in detail. By comparison of two unfavorable cases, most test data were quite agreeable with the theoretical data, which verified the design concept. The results indicate that the whole resistant behavior is well and the structure is safe and reliable. FEA which is conducted using commercial program ANSYS is a reliable method for predicting the complex stress distribution in the jointed pylon structure.

Model Test and Finite Element Analysis for the Pylon of the Jointed Pylon Cable-Stayed Bridge

In order to roundly investigate the whole structural behavior of the jointed pylon of cable-stayed bridge, 3:40 scaled-down model test and space finite element analysis （FEA） were presented by taking Yongjiang super-large bridge as an example. Test objective, model design principle, the ratio of similarity, test cases, loading method and the strain test point arrangement were introduced in detail. By comparison of two unfavorable cases, most test data were quite agreeable with the theoretical data, which verified the design concept. The results indicate that the whole resistant behavior is well and the structure is safe and reliable. FEA which is conducted using commercial program ANSYS is a reliable method for predicting the complex stress distribution in the jointed pylon structure.

Model Test for the Pylon of Cable-Stayed Bridge with Double-Tower-Connected and Four Cable Planes

Yongjiang Bridge in Ningbo is a double-tower-connected cable-stayed bridge which new structure system is very complex and the first one in China. In order to roundly investigate the structural behavior of the double-tower-connected, 3:40 scaled-down model test and space finite element analysis were presented. Test objective, model design principle, the ratio of similarity, test cases, loading method and the strain test point arrangement were introduced in detail. By comparison of two unfavorable test cases, most test data were quite agreeable with the theoretical data, which verified the design concept. The results indicate that the whole resistant behavior is well and the structure is safe and reliable.