摘要
合理有效的地震波动输入是进行土-结构动力相互作用分析的关键环节,文章基于波动法理论,提出一种新的基于内部子结构的地震波动输入方法。新方法中等效输入地震荷载由计算模型内部截取的子结构的动力分析直接获得,从而使地震波的外源输入问题转化为内源波动问题。与波动法和基于人工边界子结构的地震波动输入方法相比,内部子结构法有效提高等效输入地震荷载求解和地震波动输入的效率;同时在地震波动输入的过程中避免人工边界的参与,从而彻底摆脱以往地震波动输入方法对于人工边界条件的限制,因此该方法更具普适性。文章详细介绍了基于内部子结构的地震波动输入方法在土-结构动力反应分析中的实现方法,并通过地震波斜入射下的自由场算例与土-结构动力相互作用算例,验证新方法的有效性。
The reasonable and effective seismic wave input method is the key for the soil-structure dynamic interaction analysis.A new seismic wave input method based on the internal substructure is proposed based on the theory of wave method,in which the equivalent input seismic loads are directly obtained from the dynamic analysis of the internal substructure intercepted from the computational model.By doing so,the free wave field and the scattered wave field are separated,and the external seismic wave input problem is transformed into the internal wave problem of the calculation domain.The proposed wave input method effectively improves the efficiency of the equivalent input seismic load calculation and the seismic wave input.On the other hand,it avoids the participation of artificial boundaries in the process of inputting seismic waves.Thus the limitations on the type of artificial boundaries are completely reduced,which makes this method be able to be adopted more universally.In addition,the implementation steps of the proposed wave input method in the soil-structure dynamic interaction analysis are introduced in detail.The effectiveness of this new method is verified through the numerical examples of the free wave field and the soil-structure interaction system under obliquely incident waves.
作者
刘晶波
宝鑫
谭辉
王东洋
李述涛
Liu Jingbo;Bao Xin;Tan Hui;Wang Dongyang;Li Shutao(Tsinghua University,Beijingl00084,China;China Academy of Railway Sciences,Beijingl00081,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第8期87-96,共10页
China Civil Engineering Journal
基金
国家自然科学基金(51878384,U1839201)
国家重点研发计划(2018YFC1504305)。
关键词
地震波动输入
土-结构动力相互作用
内部子结构
人工边界
等效输入地震荷载
seismic wave input
soil-structure dynamic interaction
internal substructure
artificial boundaries
equivalent input seismic loads
