【作者】 吴迪； 范坤诚； 熊焱； 宋丹丹；

【Author】 WU Di;FAN Kun-cheng;XIONG Yan;SONG Dan-dan;Guangzhou University Engineering Earthquake Research Center;Experimental Teaching Center of civil engineering Virtual Simulation in Guangdong Province;State Key Laboratory of Subtropical Building Science, South China University of Tech.;

【机构】 广州大学工程抗震研究中心； 广东省土木工程虚拟仿真实验教学中心； 华南理工大学亚热带建筑科学国家重点实验室；

【摘要】 沿海地区工程地质条件复杂,场地条件变化对中国高速铁路隔震桥梁的抗震和隔震性能影响不容忽视。首先,通过试验和数值模拟方法研究目前中国高速铁路中摩擦摆隔震支座的力学性能;其次,根据美国规范(FEMA450)的建议将工程场地分为五类,采用有限元软件(OpenSees)对我国高速铁路的通用简支梁桥(32m)进行建模分析,获得高铁桥梁在不同场地条件下的地震响应,研究不同场地条件下地震动对高速铁路隔震桥梁的影响;并以此建立不同场地条件下高速铁路隔震桥梁的概率地震需求模型。通过不同场地的地震反应谱特征,推演不同场地隔震桥梁第一周期反应谱的谱值与反应谱峰值的关系,研究比较不同场地条件下高速铁路隔震桥梁结构隔震装置的失效概率,研究结果显示相比其他场地类型,E类场地的条件下地震动的随机性造成的不确定最为显著,且隔震装置最易于发生失效。更多还原

【Abstract】 The engineering geological conditions in coastal areas are complex, and the impact of site conditions on the seismic and seismic isolation performance of China’s high-speed railway isolated bridges cannot be ignored. Firstly, the mechanical properties of the friction pendulum isolation bearing in China’s high-speed railway are studied through experiments and numerical simulation methods. Secondly, according to the recommendations of the American Code(FEMA450), the engineering sites are divided into five categories, using finite element software(OpenSees). The generalized simply supported beam bridge(32 m) of China’s high-speed railway is modeled and analyzed, and the seismic response of high-speed railway bridge under different site conditions is obtained. The influence of ground motion on high-speed railway isolation bridge under different conditions is studied. Probabilistic seismic demand model for high-speed railway isolated bridges under conditions. Based on the seismic response spectrum characteristics of different sites, the relationship between the spectral values of the first-cycle response spectrum of different sites and the peak of the response spectrum is derived. The failure probability of high-speed railway isolated bridge isolation structure under different site conditions is studied. The results show that the uncertainty caused by the randomness of ground motion under the conditions of Class E sites is the most significant compared to other site types, and the isolation device is the most prone to failure.更多还原