Response history analyses are usually conducted to evaluate seismic performance of buildings. Since azimuth-dependent buildings are quite common in practice, bidirectional ground motions are considered to be important input motions for the analyses. Based on RotDpp target response spectrum that is widely used to characterize seismic loads of bidirectional ground motions, this study proposes a method to generate spectrum-matched bidirectional time histories using Hilbert–Huang Transform (HHT). To demonstrate applicability of the proposed method, 15 pairs of spectrum-matched bidirectional time histories are generated by the proposed method for a nuclear power plant site. The study further discusses compatibility between these generated bidirectional time histories and the RotDpp target response spectrum. After that, these spectrum-matched time histories are applied to calculate floor response spectra of a service building for a nuclear power plant. After analyzing relative errors of the calculated floor response spectra, advantages of the proposed method are demonstrated. The study finds that, bidirectional time histories generated by the proposed method well match the RotDpp target response spectrum, and they could also provide accurate seismic response analysis of three-dimensional buildings.

响应历史分析通常用于评估建筑物的抗震性能。由于方位相关的建筑物在实践中非常普遍，因此双向地面运动被认为是分析的重要输入运动。基于广泛用于表征双向地震动载荷的RotDpp目标响应谱，本研究提出了一种使用Hilbert-Huang变换（HHT）生成谱匹配双向时程的方法。为了证明该方法的适用性，该方法为核电站生成了 15 对频谱匹配的双向时程地点。该研究进一步讨论了这些生成的双向时间历史与 RotDpp 目标响应谱之间的兼容性。之后，这些频谱匹配的时间历程被应用于计算核电站服务楼的楼层响应谱。在分析了计算的地板响应谱的相对误差后，证明了该方法的优点。研究发现，该方法生成的双向时程与RotDpp目标响应谱非常匹配，还可以提供准确的三维建筑物地震响应分析。