水平土层地震响应地面峰值加速度可靠度研究  

Reliability of peak ground acceleration in the seismic response analysis on stratified soil

作　　者：梁师俊[1] 蒋蓓[1] LIANG Shijun;JIANG Bei(Department of Architecture Engineering,Zhejiang College of Construction,Hangzhou 311231,China)

机构地区：[1]浙江建设职业技术学院建筑工程学院,杭州311231

出　　处：《振动与冲击》2022年第6期30-36,85,共8页Journal of Vibration and Shock

摘　　要：针对地震随机性及场地条件随机性两种不确定影响下地面峰值加速度(ground peak acceleration,GPA)可靠性问题,该研究基于等效场地剪切波速的概率分布,推导了水平成层地基场地地震响应地面峰值加速度解析解的表达式,得出了场地地面峰值加速度的概率密度分布函数。通过收集到的浙江某科技城100例场地土层实测数据,用Flac3D软件模拟分析了场地地面峰值加速度数值解,拟合了场地地面峰值加速度的概率密度分布函数,在此基础上,给出了场地地面峰值加速度在任意可靠度水平下的置信区间方程。结果表明,不管是解析分析还是数值分析,得到的水平成层地基场地地震响应地面峰值加速度都符合正态分布,且由解析分析得到的地震响应地面峰值加速度置信区间最大允许偏差值较由数值分析得到的最大允许偏差少,由数值分析得到的地面峰值加速度较由解析分析得到的地面峰值加速度分布更离散。Aiming at the reliability of ground peak accelerations(GPA)under the uncertain influences of the randomness of earthquake and site conditions,based on the probability distribution of an equivalent site shear wave velocity,the analytical solution of ground peak accelerations in the seismic response analysis of horizontally layered foundations was derived,and the probability density distribution function of the ground peak accelerations of the site,was obtained.By virtue of the collected 100 actual soil measurements data from the site in a science and technology city in Zhejiang province,the procedure Flac3 D software was used to simulate and analyze the numerical solution of the ground peak accelerations,and the probability density distribution function of the ground peak accelerations of the site was fitted.On this basis,the confidence interval equation of the ground peak accelerations of the site at any reliability level was given.The results show that the seismic response ground peak accelerations of the horizontal layered foundation site obtained by analytical or numerical analysis conform to the normal distribution,and the maximum allowable deviation of their confidence interval obtained by the analytical analysis is more than that obtained by the numerical analysis.Moreover,the distribution of the peak ground accelerations obtained by numerical analysis are more discrete than those obtained by analytical analysis.

关 键 词：均质土层 峰值加速度 概率密度分布 置信区间 

分 类 号：P315.9[天文地球—地震学] TU471.3[天文地球—固体地球物理学]