地下结构动力响应分析中人工边界的影响  

Effect of artificial boundary on seismic response of underground structure

作　　者：谷拴成[1] 朱彬[1] 杨荣尚 

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]陕西西汉高速公路有限责任公司,陕西西安710054

出　　处：《辽宁工程技术大学学报（自然科学版）》2007年第3期375-377,共3页Journal of Liaoning Technical University (Natural Science)

基　　金：陕西省教育厅专项科研计划资助项目(03JK141)

摘　　要：基于有限元分析方法,运用大型通用软件ANSYS对某地下结构进行了地震载荷下的动力响应分析,分别比较了自由边界、固定边界和粘性边界的精度。当采用固定边界时,计算结果与实际偏差较大,同粘性边界相比,其内力增大了2倍左右;而自由边界与粘性边界相比,计算结果则增大了1.5倍左右。因此,当采用固定边界和自由边界计算时,地下结构的地震响应被过高的估计了;而粘性边界能够使地震波动能量向地基远域逸散,其结果更为准确。Based on finite element method, the seismic responses of a tunnel are analyzed by using the ANSYS program. The computing precisions of three types of conditions such as free boundary, viscous boundary and fixed boundary are compared. The results show that fixed boundary is not reasonable; its internal force is two times than that of the viscous boundary. And the internal force of free boundary is one and a half times than that of the viscous boundary too. The earthquake responses of the tunnel are overestimated when free and fixed boundary is used. The results indicate that the viscous boundary is more reasonable than free and fixed boundary.

关 键 词：地下结构 动力响应 人工边界 地震 

分 类 号：TU435[建筑科学—岩土工程]