厚软场地上大跨径桥梁设计反应谱研究(英文)  

Study on Response Spectra for Design of Large Span Bridge on Ground with Thick and Soft Soil Layers

作　　者：杨伟林[1] 高志兵[1] 陶小三[1] 高德潜[1] 崔爱华[1] 

机构地区：[1]江苏省地震局,南京210014

出　　处：《防灾减灾工程学报》2005年第4期394-400,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：江苏省自然科学基金项目(BK2004161);江苏省交通科学研究基金项目(04Y025)~~

摘　　要：大跨径桥梁塔高、跨径大、自振周期长,深厚、软弱场地的长周期地震动对桥体结构影响较大。我国《公路工程抗震设计规范(JT J004-89)》也只适用主跨不超过150 m的梁桥和拱桥,国内长期以来没有一个适用于大跨径桥梁的抗震设计规范或指南。本文结合大跨径桥梁工程实例,根据场地土层静、动力性能参数的原位测试和动三轴试验结果,进行厚软场地土层地震反应分析,研究厚软场地的地震动效应,讨论了不同地震动强度时厚软场地的设计反应谱特征,分析了现行规范设计反应谱应用的局限性,成果对相关工程有重要指导意义,对大跨径桥梁抗震设计规范的制定也有借鉴作用。Large span bridges have high towers and large spans with long natural-vibration cycle, and long vibration cycles of ground with thick and soft soil layers have significant effect on the bridge structures. The ＂Specifications of Earthquake Resistant Design for Highway Engineering of China （JTJ004-89）＂ can also be applied to girder bridges and arch bridges with a main span below 150 m, yet, there has been no anti-seismic design specification or guideline in China applicable to large span bridges. In this paper, the author has performed seismic response analysis for ground with thick and soft soil layer in conjunction with examples of large span bridge projects on the basis of the results of static and dynamic performance parameter in-situ tests of ground soils and dynamic triaxial test, studied the seismological effect of ground with thick and soft soil layers, discussed the design response spectrum characteristics of ground with thick and soft soil layer at different seismic intensities, and analyzed the limit of current specification of design response spectrum in actual applications. The results have important guiding significance to relevant projects, and can also be used in the promulgation of aseismic design code for large-span bridges.

关 键 词：厚软场地 场地地震动效应 大跨径桥梁 设计反应谱 

分 类 号：U448.17[建筑科学—桥梁与隧道工程] P315.9[交通运输工程—道路与铁道工程]