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Lei B.,Zhejiang Institute of Communications | Lv Y.Z.,Highway Administration of Hangzhou | Ren W.,Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications
Applied Mechanics and Materials | Year: 2014

Against the current problem of large errors in the test result of short cable force, this paper, based on energy method principle, introduces the concept of simply-supported modal participation factor. On the premise of considering the impact of such factors as flexural rigidity and boundary conditions, etc. on cable force test, this paper corrects the existing prediction models for short cable force, to provide a computational formula based on compound boundary conditions for the short cable force. Field measured data is combined to compare the prediction accuracy of the existing formulas, to draw a conclusion that the error of short cable force is almost always greater than 5% when calculation is based on simple-supported boundary conditions, and the error of short cable force is always greater than 10% when calculation is based on consolidation boundary conditions, while the error of short cable force is always less than 5% when calculation is based on the compound boundary conditions presented in this paper. © (2014) Trans Tech Publications, Switzerland. Source


Lv Y.Z.,Highway Administration of Hangzhou | Chen G.Q.,Highway Administration of Hangzhou | Lei B.,Zhejiang Institute of Communications | Ren W.,Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications
Applied Mechanics and Materials | Year: 2014

Aimed to solve the problem that the reasonable finished state (RFS) of space-twisting cable leaning tower cable-stayed bridge (SLCSB) is inconsistence with actual finished state. The numerical analysis and field test methods are used. Firstly, based on comprehensive studying of the interaction between influencing factors of the finished state and construction state, analysis methods of coupling RFS and rational construction state(RCS) are proposed with the thought of construction process control implanting into design stage. Secondly,a main span of 220m SLCSB is used as example, the coupling analysis method proposed in the paper was proved. Finally, with some data measured from actual project, it shows that: this method can ensure the cable tension, the main beam and the main tower bending moments forming RFS at the same time, while the problems of the inconsistency between RFS and one-step bridge status is solved. © (2014) Trans Tech Publications, Switzerland. Source


Lei B.,Zhejiang Institute of Communications | Lv Y.Z.,Highway Administration of Hangzhou | Ren W.,Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications
Applied Mechanics and Materials | Year: 2014

In order to study the differences between spaces twisted backstay inclined tower cable-stayed bridge and conventionally cable-arranged cable-stayed bridge in mechanical property, this paper, taking a single-stay inclined tower space twisted backstays cable-stayed bridge as the study project, adopting FEM by changing the form of the backstays, makes a contrastive analysis on the difference between space twisted backstays cable arrangement(TBCA) and fan-shaped backstays cable arrangement(FBCA) in such aspects as static performance, dynamic property and stability. Some conclusions are concluded: the TBCA is easy to cause such problems as uneven distributed cable force, larger girders' bending moment and stress; the integral rigidity of TBCA is less than that of FBCA; in stability, these two differ little, etc. As far as the overall comparison is concerned, TBCA is basically rational from the point of stress. However, while obtaining a certain visual effect, its mechanical property decreases somewhat. © (2014) Trans Tech Publications, Switzerland. Source


Ren W.,Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications | Gai Y.-T.,China Communications Construction Company Ltd. | Yan L.,Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition) | Year: 2014

In order to study the FRP-concrete interfacial debonding failure mechanism and make up for the inadequacy of the method of observation, the article, on the basis of 9 groups double shear model test, used numerical analysis method, applied Concrete Damaged Plasticity Model, Cohesive behavior method and bilinear traction-separation model to the analysis, and implemented the simulation of concrete damage and FRP concrete interface slip. Research shows that the ultimate load values of the components without in depth processing are smaller, and the largest FRP strength utilization is only 48.31%. Increasing the number of FRP paste layers can effectively improve the ultimate load, but at the same time the utilization rate of FRP material strength decreases obviously. The ultimate load obtained by using the analysis method in this paper is closer to the test results. The maximum deviation is about 10%. FRP-concrete interface crack depth is about 1 cm and the damage width is 1. 5 to 2.0 times of FRP paste the range. The slippage at the peak stress of the interface is about 0.5 to 0.7 mm, while the limit sliding is 1.5 mm to 2.0 mm. Through the comparison with the measured values, the reliability and scientificity of the method in this paper is verified and it offsets the deficiency of the test method. Source


Ren W.,Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications | Gai Y.,China Communications Construction Company Ltd. | Huang Y.,Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2014

In view of the deficiency of seismic research on widen bridge at soft soil area, the paper, based on an unequal span continuous beam bridge at Pearl River Delta, took pile-soil effect into consideration. Fiber inelastic beam element, finite element program Midas/civil is used to do elastic-plastic seismic response analysis on existing bridge model and widen bridge model under two field soil conditions. The paper researched displacement response of the structure's key position corresponding with different input direction of seismic wave, the occurrence moment, position and failure mode of plastic hinge. Researches showed that the seismic response displacement extreme of widen bridge at soft soil field was the biggest, which was nearly 1. 15 times of it at the sand field. Under hierarchical vertical and lateral seismic loads, plastic hinge firstly occurred at pier of widen bridge at soft soil field, where failure happened easily and the failure moment was earlier. By contrasting existing bridge model with widen bridge model, structure widening was bad for aseismatic action, the paper suggested that seismic checking requirements of widen bridge should be enhanced. Source

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