This article investigates seismic demands of underground structures with a rectangular section in a two-dimensional framework subjected to complete passage of shear wave field of motion. The wave field is considered to have different incident angles with the structure. Using the finite element approach, frequency-dependent strain transfer functions for different parts of the structure are estimated. The transfer functions convert maximum free field shear strains to the uppermost strains imposed on structural sections. It is shown that maximum demands would not happen simultaneously for different parts of the structure. Also, critical frequencies of excitation and dominant incident angles may differ from each structural section to the other one. In the last part, simplified equations that cover dynamic characteristics of the problem and influences of different incident angles are suggested as correction factors to modify the strains commonly calculated from traditional static approaches.

本文研究了二维框架中矩形截面地下结构在剪切波运动场完全通过的情况下的抗震要求。波场被认为与结构具有不同的入射角。使用有限元方法，估计结构不同部分的频率相关应变传递函数。传递函数将最大自由场剪切应变转换为施加在结构截面上的最高应变。结果表明，对于结构的不同部分，最大需求不会同时发生。此外，激励的临界频率和主入射角可能因每个结构部分而异。在最后一部分，