整体式反应位移法在地下结构抗震设计中的应用

Application of Integrated Seismic Displacement Method in Seismic Design of Underground Structures

整体式反应位移法是地下结构抗震设计的重要方法之一,具有理论成熟、操作简便、适用性广和计算精度高等优点,但已有文献中并未详细介绍整体式反应位移法的操作步序,这易对方法的正确使用带来问题。针对工程界经常反馈的几个问题,结合北京地铁16号线阜外大街站主体结构设计方案,提供了一个完整的整体式反应位移法抗震分析例题详解,同时分析了土体侧向边界至结构侧壁距离对计算结果的影响,结果表明,此距离不宜小于2倍的结构横断面长度。本研究诣在解决整体式反应位移法在工程实践中的具体使用问题,有助于避免由操作不当带来的计算误差,具有较强的工程参考价值。

The Integrated Seismic Displacement Method(ISDM)is one of the most important methods for the seismic design of underground structures.ISDM has the advantages of the maturational theory,convenient operation,wide applicability and high computational precision,etc.However,the using flow of the method was not detailed in the literature.It may bring up troubles when one uses the method in the practice.To answer the hot queries proposed by the engineering designers,the study presents a detailed example of ISDM,based on the main-body structural design plan of the Fuwaidajie subway station,Beijing Subway Line 16,Beijing,China.In addition,the influence of the distance between the soil lateral boundary and the structure on the ISDM results was also analyzed.It shows that the distance should not be less than double length of the structural cross-section.The study aims to solve the usage problems of ISDM.It can help to avoid errors caused by mis-operation of ISDM and the study is valuable when it is referenced in the engineering practice.