Modify equivalent linear method of finding soil seismic response with magnitude and distance parameters
-
摘要: 传统等效线性化波动法主要的缺陷之一，是当基岩输入地震动较强时，高频段算得的频响放大倍率比实际场地的实测结果明显偏低．该缺陷可能导致低估重大工程的设计地震动参数的严重后果，因而是亟待解决的重要问题．本文认为，现行基于土的剪切模量和阻尼比的频率相关性修正等效剪应变的做法有其合理性，但不便应用并可能具有较大的不确定性；由于震级可以影响地震动的频谱特征，通过震级调整等效剪应变的做法也可视为按照频率调整等效剪应变．由于距离与震级一样也可以影响地震动的频谱特征，本文提出通过震级M和距离R参数修正等效线性化的方法EQLM（M,R），并用算例说明，等效线性化方法的上述缺陷可以通过本文提出的EQLM（M,R）方法得到一定程度的改善．
-
关键词:
- 土层地震反应 /
- 等效剪应变 /
- 等效线性化方法 /
- 频率相关模量和阻尼比
Abstract: Abstract: One of important shortcomings of the traditional equivalent linear method（EQLM）is that for large input motions the magnification of high frequency components calculated is obviously lower than that observed. The defect may lead to a serious result of underestimating design ground motion parameters for key projects. So this important issue needs to be solved. Although it is reasonable to improve EQLM by using frequency dependent modules and damping ratios, it is not convenient to use and has great uncertainties. This article points out that, because magnitudes can affect spectra of ground motion, the method to improve EQLM by adjusting equivalent shear strain based on magnitudes may also be regarded as frequency dependent. Since distance can also affect the spectra, we suggest a method EQLM(M, R) to improve EQLM by the parameters of magnitudes and distances. An example of EQLM(M, R) is given to show that the above mentioned shortcoming of EQLM can be resolved to some extent. -
-
-
期刊类型引用(6)
1. 陆吉赟，路建波，周新民. 爆炸波土层动力响应对比分析. 地震工程学报. 2019(02): 412-417 . 
百度学术
2. 荆旭. 核设施一维土层地震反应分析中的参数不确定性. 震灾防御技术. 2017(02): 266-275 . 百度学术
3. 宋建希，李建波，林皋. 层状场址自由场动力分析的等价线性法研究. 地震研究. 2016(01): 126-130+182 . 百度学术
4. 孙锐，赵倩玉，袁晓铭. 液化与非液化场地加速度反应谱对比. 岩土力学. 2014(S1): 299-305 . 百度学术
5. 马宗源，乔蓓，王振华，党发宁. 等效线性及非线性方法的土坝地震反应分析. 水电能源科学. 2013(12): 80-82+79 . 百度学术
6. 沈建文，刘峥. 等效线性化地震反应的震级距离参数调整法及其在地震安全性评价中的应用. 震灾防御技术. 2011(03): 220-230 . 百度学术
其他类型引用(7)
计量
- 文章访问数: 1619
- HTML全文浏览量: 657
- PDF下载量: 127
- 被引次数: 13
下载:
