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。 In order to understand the nonlinear experimental error of dynamic shear modulus ratio and damping ratio and its influence on ground motions, the experimental and numerical simulation methods were used to study the error of dynamic shear modulus ratio and damping ratio test and to propose its probability distribution characteristics. And the effect and rule of this error on the calculation of soil ground motion are given. The risk level of the impact on ground motion is also given. Two representative test groups with the largest and the smallest discreteness were designed. The probability and statistical indexes of the test error were given through a single resonance column test. At the same time, different types of sites and different seismic wave inputs are designed to complete the risk analysis. The results show that the dynamic shear modulus ratio and the damping ratio test data of the two kinds of groups both follow a normal distribution. The mean values ​​of the two tests are close to each other, but the coefficient of variation is about 5 times different. The dynamic shear modulus ratio and damping ratio test error Which has an important influence on the calculation results of ground motion. The influence degree increases with the increase of experimental error, the soft ground of the site and the increase of the earthquake intensity. The experimental error and the type of site play a major role. With the threshold that can not be ignored due to ground motion, The primary technical staff’s dynamic shear modulus and damping ratio test error is 35% for the medium hard site and 50% for the soft site. In the general case, the technical regulations of resonant column test should be strengthened to improve the technical level of the experimenter , Otherwise it will pose a great risk to the earthquake structure input estimation.