采用随机振动理论的功率谱法，对双向张弦梁结构在多维地震作用下的动力性能及抗震计算两方面问题进行了探讨。
以一个90m×90m 的双向张弦梁屋盖结构为算例，分析了结构的自振特性、多维地震下的位移和内力响应特点、各地震动分量
对结构响应的贡献以及上下部协同工作的影响等。在地震作用计算方面，对组合振型数的选取、预应力效应的影响、阻尼比
的敏感性以及《建筑抗震设计规范》（GB50011）的多维地震效应组合方法的有效性进行了考察。文中对双向张弦梁结构的一
些非常规地震响应特点给予了强调，提出抗震计算方面的建议，可供设计人员参考。

Based on the power spectrum method of stochastic vibration theory, the seismic response and its computation of two-way
Beam String Structure (BBS) under multi-dimensional earthquake excitation are discussed. By means of an illustrative 90m × 90m
two-way BBS roof, dynamic properties and characteristics of multi-dimensional earthquake responses are presented. Structural
response contributions from different ground motion component and interactions between roof and supporting frame are also
analyzed. Some aspects on seismic computation of two-way BBS are further investigated, including the reasonable number of
participation modes, the impact of initial prestress distributions and the sensitivity of damping ratios. The validity of
multi-dimensional seismic effect combination method, suggested in China Code for Seismic Design of Buildings (GB50011), is also
probed. Unconventional dynamic response characteristics of two-way BBS are emphasized. Some suggestions on the seismic
computation are also ard for the design of two-way BBS.