【作者】 王纪强； 王华林； 窦海岳； 陈平； 沈德秀；

【Author】 WANG Jiqiang;WANG Hualin;DOU Haiyue;CHEN Ping;SHEN Dexiu;Earthquake Administration of Shandong Province;

【机构】 山东省地震局；

【摘要】 山东省临沂天蒙山拟建一座双塔单跨吊悬人行索桥,工程结构最大自振周期约4.8 s,场地条件十分复杂,对工程抗震设计地震动参数有特殊要求。文中分析研究了该工程的地震构造背景、地震活动特征和场地工程地质条件,经过地震动衰减关系的适用性分析,利用地震危险性概率分析方法得到了场地两端塔基处50年超越概率10%和100年超越概率63%、10%、4%、2%的基岩加速度峰值。充分考虑到场地条件的复杂性和悬索桥的结构特点,对长周期设计反应谱进行了合理性分析,最终获得了阻尼比1%、2%、3%、5%的设计地震动参数。本研究结果为本工程的抗震设计提供了科学依据,为其他长周期悬索桥工程设计地震动参数的确定提供可供借鉴的经验和方法。更多还原

【Abstract】 There will be a two-tower single-span pedestrian suspension bridge in Linyi district,its maximum natural vibration period is about 4.8 s.Because of the complexities of the site conditions,special requirements for the seismic design of the ground motion parameters are called.In this paper,introductions to the seisotectonic background,seismic activity and surveys of engineering geological conditions were given.After applicability analysis of the attenuation relationship of ground motion,the bedrock seismic ground motion parameters of exceedance probability of10%in 50 years and of 63%、10%、4%、2%in 100 years,on both sides of the floor tower foundation,were given by using probabilistic seismic hazard analysis method.Fully considering the site conditions and the structural characteristics of the suspension bridge,we analyzed the rationality of long-period design response spectrum,and obtained the design ground motion parameters of damping ratio 1%,2%,3%and 5%.The results provided scientific basis for the seismic design of this project,and the experience and methods for determining the design parameters of ground motion of other long-period suspension bridges project.更多还原