發(fā)布時間：2019-02-24 19:39

【摘要】：為了給蘭州乃至西北地區(qū)的地震安全性評價和重大工程抗震設計提供參考,在蘭州地區(qū)選取4個不同類別場地,完成由10家單位參加、使用不同儀器剪切波速現(xiàn)場測試誤差專項實驗,研究該地區(qū)剪切波速實測誤差分布規(guī)律,討論測試誤差對地表加速度反應譜影響的統(tǒng)計特征,并給出該地區(qū)剪切波速測試誤差評價。結(jié)果表明:蘭州地區(qū)各單位剪切波速測試誤差具有明顯規(guī)律性,測試誤差絕大部分符合標準正態(tài)分布,且誤差大小不隨深度和場地類別而改變;蘭州地區(qū)波速測試水平優(yōu)于全國平均水平,Ⅰ類、Ⅱ類和Ⅲ類場地的剪切波速測試精度較高,偏差較小,其平均標準差可以定為10%;就蘭州地區(qū)而言,其1倍波速測試標準差引起PGA最大偏差為25%,2倍標準差為50%;給定波速測試誤差下反應譜變化程度與輸入波形相關(guān),輸入波頻率成分與場地頻率成分接近的地震輸入下,誤差影響較大,反之則影響較小。
[Abstract]:In order to provide a reference for seismic safety evaluation and seismic design of major projects in Lanzhou and even the northwest region, four different types of sites were selected and 10 units participated. In this paper, a special experiment of measuring error of shear wave velocity in different instruments is used to study the error distribution of shear wave velocity in this area, and the statistical characteristics of the influence of test error on the response spectrum of surface acceleration are discussed. The error evaluation of shear wave velocity measurement in this area is also given. The results show that the measurement error of every unit shear wave velocity in Lanzhou area has obvious regularity, most of the measurement errors accord with the standard normal distribution, and the error does not change with depth and site category. The testing level of wave velocity in Lanzhou area is better than the national average level. The accuracy and deviation of shear wave velocity measurement of class 鈪，

本文編號：2429868