CAJ | 학술논문

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(JTJ004-89)>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.
대과경교량탑고、과경대、자진주기장,심후、연약장지적장주기지진동대교체결구영향교대.아국<공로공정항진설계규범(JTJ004-89)>야지괄용주과불초과150 m적량교화공교,국내장기이래몰유일개괄용우대과경교량적항진설계규범혹지남.본문결합대과경교량공정실례,근거장지토층정、동력성능삼수적원위측시화동삼축시험결과,진행후연장지토층지진반응분석,연구후연장지적지진동효응,토론료불동지진동강도시후연장지적설계반응보특정,분석료현행규범설계반응보응용적국한성,성과대상관공정유중요지도의의,대대과경교량항진설계규범적제정야유차감작용.
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.