动剪切模量阻尼比试验误差及对地震动影响风险评价

发布时间：2018-03-17 17:31

本文选题：动剪切模量比和阻尼比　切入点：试验误差　出处：《振动与冲击》2017年19期 　论文类型：期刊论文

【摘要】：为认识动剪切模量比和阻尼比非线性试验误差及其对地震动的影响,采用试验和数值模拟手段,研究了动剪切模量比和阻尼比试验误差并提出其概率分布特征,以及这一误差对土层地震动计算结果的影响和规律,给出了其对地震动影响的风险水平。设计了离散性最大和最小的两种代表性试验组,通过单台共振柱仪试验给出了试验误差的概率统计指标。同时设计不同类别场地和不同地震波输入,完成风险分析。结果表明:两种类别组的动剪切模量比和阻尼比试验数据均服从正态分布,二者试验均值接近,但变异系数相差5倍左右;动剪切模量比和阻尼比试验误差对地震动计算结果有重要影响,影响程度随试验误差增大、场地变软和地震强度增加而增大,其中试验误差和场地类别起主要作用;以对场地地震动产生不可忽视影响为阈值,初级技术人员动剪切模量和阻尼比的试验误差对中硬场地的风险水平为35%,对软场地则为50%;就一般情况,应强化共振柱试验技术规程,提高试验人员技术水平,否则会对工程结构的地震动输入估计造成很大风险。
[Abstract]:In order to understand the nonlinear test errors of dynamic shear modulus ratio and damping ratio and their influence on ground motion, the experimental errors of dynamic shear modulus ratio and damping ratio are studied by means of experiment and numerical simulation, and their probability distribution characteristics are presented. As well as the influence and law of this error on the calculation results of soil motion, the risk level of its influence on ground motion is given, and two representative test groups with maximum and minimum discreteness are designed. The probabilistic and statistical indexes of the test error are given by means of a single resonant column instrument. At the same time, different kinds of sites and different seismic wave input are designed. The results showed that the test data of dynamic shear modulus ratio and damping ratio of the two groups were from normal distribution, the mean values of the two tests were close to each other, but the coefficient of variation was about 5 times different. The experimental error of dynamic shear modulus ratio and damping ratio has an important effect on the calculation results of ground motion, and the influence degree increases with the increase of test error, site softening and earthquake intensity, among which the test error and site type play a major role. Taking the influence on ground motion as the threshold, the risk level of the test error of dynamic shear modulus and damping ratio for primary technicians is 35 for the medium hard site and 50 for the soft site. In general, the technical specification for the resonance column test should be strengthened. Improving the technical level of the experimenter, otherwise it will cause great risk to the ground motion input estimation of the engineering structure.
【作者单位】：中国地震局工程力学研究所地震工程与工程振动重点实验室;滨州学院建筑工程学院;
【基金】：国家科技支撑计划项目(2015BAK17B01) 国家重点研发计划政府间国际科技创新合作重点专项(2016YFE0105500) 中央级公益性研究所基本科研业务费专项(2016A02) 滨州学院科研启动(2016Y26)
【分类号】：TU317

【相似文献】