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首页> 外文期刊>Journal of Earthquake Engineering >EFFECTS OF AXIAL FORCE VARIATION IN THE SEISMIC RESPONSE OF BRIDGES ISOLATED WITH FRICTION PENDULUM SYSTEMS
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EFFECTS OF AXIAL FORCE VARIATION IN THE SEISMIC RESPONSE OF BRIDGES ISOLATED WITH FRICTION PENDULUM SYSTEMS

机译：轴力变化对摩擦摆系统隔震桥梁地震响应的影响

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摘要

The effects of the axial load variations on the seismic response of bridges isolated with friction pendulum systems (FPS) are investigated. A series of parametric time history non-linear analyses are performed for different bridge configurations, defined after an extensive investigation on typical existing cases. The influence of both horizontal and vertical components of the ground motion is considered. The behaviour of the pier-isolator-deck system is predicted using two analytical models characterised by hysteretic loops sensitive or insensitive to axial force variations, in order to compare the different responses. Level of axial force, maximum displacements and induced bending moment are investigated, as well as shear and torsion demand, caused by different shear actions acting on the isolator devices. A comparison between demand and resistance capacity of the bridge piers is performed, in order to investigate possible non-conservative approaches in the current design methods and to raise controversial issues on the subject.
机译：研究了轴向载荷变化对摩擦摆系统（FPS）隔离的桥梁的地震响应的影响。在对典型的现有案例进行了广泛研究之后，针对不同的桥梁配置执行了一系列参数时程非线性分析。考虑地面运动的水平分量和垂直分量的影响。为了比较不同的响应，使用两个分析模型来预测码头-隔离层-甲板系统的行为，该模型的特征是对轴向力变化敏感或不敏感的磁滞回线。研究了由作用在隔离装置上的不同剪切作用引起的轴向力，最大位移和引起的弯矩的大小以及剪切和扭转需求。为了研究当前设计方法中可能的非保守方法，并就该主题提出有争议的问题，对桥墩的需求量和抵抗能力进行了比较。

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