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Effects of vertical excitation on the seismic performance of a seismically isolated bridge with sliding friction bearings 被引量:2
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作者 Wang Changfeng Zhao Jikang +1 位作者 Zhu Long Bao Yijun 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2016年第1期187-196,共10页
A finite element model is constructed for a sliding friction bearing in a seismically isolated bridge under vertical excitation with contact/friction elements. The effects of vertical excitation on the seismic perform... A finite element model is constructed for a sliding friction bearing in a seismically isolated bridge under vertical excitation with contact/friction elements. The effects of vertical excitation on the seismic performance of a seismically isolated bridge with sliding friction bearings and different bearing friction coefficients and different stiffness levels (pier diameter) are discussed using example calculations, and the effects of excitation direction for vertical excitation on the analysis results are explored. The analysis results shows that vertical excitation has a relatively large impact on seismic performance for a seismically isolated bridge with sliding friction bearings, which should be considered when designing a seismically isolated bridge with sliding friction bearings where vertical excitation dominates. 展开更多
关键词 vertical excitation seismically isolated bridge sliding friction bearing seismic analysis
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Dynamic performance analysis of a seismically isolated bridge under braking force 被引量:1
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作者 Yu Fang Wen Liuhan·heisha +1 位作者 Zhou Fulin Ye Lieping 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2012年第1期35-42,共8页
In order to study the dynamic performance of seismically isolated bridges under the most unfavorable loads in the longitudinal direction, a dynamic equation for vehicle braking in the longitudinal direction is establi... In order to study the dynamic performance of seismically isolated bridges under the most unfavorable loads in the longitudinal direction, a dynamic equation for vehicle braking in the longitudinal direction is established. A four or five- order Runge-Kutta method is adopted to obtain the time-history response of a wheel set under braking force. The quadratic discretization method is then used to transform this time-history into a braking and bending force time-history of a structural fixed node, and a dynamic response analysis of the seismically isolated bridge under the vehicle's braking force is carried out using ANSYS, a universal finite element analysis software. According to the results, seismic isolation design results in a more rational distribution of braking force among piers; the influence of the initial braking velocity on the vehicle braking force is negligible; the location where the first wheel set leaves the bridge is the most unfavorable parking location; a seismic isolation bridge bearing constructed according to typical design methods enters into a yield stage under the braking force, while the shearing force at the bottom of the pier declines as the isolation period is extended; the design requirements can be met when the yield displacement of the seismic isolation bearing is less than 5 mm and the yield strength is greater than the braking force. 展开更多
关键词 seismically isolated bridge braking force coupling vibration quadratic discrete dynamic analysis
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Experimental and Finite Element Analysis for Multi-lead Rubber Bearings:A Comparative Study
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作者 聂肃非 江宜城 +1 位作者 叶志雄 李黎 《Journal of Southwest Jiaotong University(English Edition)》 2010年第2期134-139,共6页
The mechanical properties of multi-lead rubber bearings (MLRBs) were investigated by experiment and finite element analysis. First, the vertical stiffness, horizontal stiffness and yielded shear force were tested fo... The mechanical properties of multi-lead rubber bearings (MLRBs) were investigated by experiment and finite element analysis. First, the vertical stiffness, horizontal stiffness and yielded shear force were tested for four MLRB specimens and two specimens of the single-lead rubber bearings ( SLRBs). Then, the MLRBs were modeled by the explicit finite element analysis software ANSYS/ LS-DYNA, in order to evaluate the horizontal force-displacement hysteretic curves under static vertical and dynamical horizontal loadings. The disagreement between the tested and theoretical values was less than 11.4%, and MLRBs and SLRBs were similar in vertical stiffness, pre-yield stiffness and yield stiffness. 展开更多
关键词 bridge seismic isolation Multi-lead rubber bearing Nonlinear mechanical properties Experimental study Explicit finite element analysis
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