基于Marc二次开发实现粘弹性人工边界和振型分解反应谱法  

Viscoelastic artificial boundary and response spectral method of mode decomposition based on Marc second development

作　　者：王少伟 包腾飞 WANG Shaowei;BAO Tengfei(School of Environmental and Safety Engineering,Changzhou University,Changzhou 213164,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]常州大学环境与安全工程学院,江苏常州213164 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《世界地震工程》2018年第3期129-137,共9页World Earthquake Engineering

基　　金：国家自然科学基金(51709021);水文水资源与水利工程科学国家重点实验室开放研究基金(2016491111)

摘　　要：新版《水电工程水工建筑物抗震设计规范》(NB35047-2015)中规定:"抗震设防类别为甲类的混凝土坝应考虑远域地基的辐射阻尼效应"。针对通用商业有限元软件Marc在振型分解反应谱法中的不足,且缺少时程分析法中模拟地基辐射阻尼效应的粘弹性人工边界,采用Fortran语言编制相应的独立程序及二次开发程序,以便在Mrac软件中精确实现新规范要求下的混凝土坝抗震安全评价。数值算例和工程实例分析结果验证了基于Marc二次开发实施思路和自编程序的正确性;重力坝抗震薄弱部位主要为坝体断面突变处,考虑无限地基的辐射阻尼效应后,坝体地震动力响应明显下降。According to the new code for seismic design of hydraulic structures for hydropower projects （ NB35047 - 2015 ）, the radiation damping effect of the distant foundation should be considered for concrete dams with seismic fortification A-class. However, the general commercial finite element software Marc cannot directly output the stress response when using response spectral method of mode decomposition, and lacks the viscoelastic artificial boundary for simulating the radiation damping effect of foundation in time history analysis. In order to evaluate seismic per- formance of concrete dams under the new specification by Marc software, realization methods of the viscoelastic arti- ficial boundary and the response spectral method of mode decomposition based on Marc are proposed, and the cor- responding independent programs and second development programs are compiled based on the Fortran language Results of both numerical simulation and engineering analysis verified the correctness of the implementation ideas and the compiled programs. The seismic weak parts of gravity dams are mainly the abrupt change of the section of dam body, and the seismic dynamic response of the dam body decreases obviously when considering the radiation damping effect of the infinite foundation.

关 键 词：粘弹性人工边界 振型分解反应谱法 MARC 二次开发 

分 类 号：P315.9[天文地球—地震学]