To achieve rational and precise seismic response predictions of large span spatial structures (LSSSs), the inherent non-uniformity and multidimensionality characteristics of earthquake ground motions should be properly taken into consideration. However, due to the limitations of available earthquake stations to record seismic rotational components, the effects of rocking and torsional earthquake components are commonly neglected in the seismic analyses of LSSSs. In this study, a newly developed method to extract the rocking and torsion components at any point along the area of a deployed dense array from the translational earthquake recordings is applied to obtain the rotational seismic inputs for a LSSS. The numerical model of an actual LSSS, the Dalian International Conference Center (DICC), is developed to study the influences of multi-support and multidimensional excitations on the seismic responses of LSSSs. The numerical results reveal that the non-uniformity and multidimensionality of ground motion input can considerably affect the dynamic response of the DICC. The specific degree of influence on the overall and local structural displacements, deformations and forces are comprehensively investigated and discussed.

为了实现大跨度空间结构（LSSS）的合理，准确的地震响应预测，应适当考虑地震地震动固有的非均匀性和多维性。但是，由于可用地震台站记录地震旋转分量的局限性，在LSSS的地震分析中通常忽略了摇摆和扭转地震分量的影响。在这项研究中，采用了一种新开发的方法来从平移地震记录中提取沿部署的密集阵列区域的任意点处的摇摆和扭转分量，以获取LSSS的旋转地震输入。实际的LSSS的数值模型，大连国际会议中心（DICC），旨在研究多支撑和多维激励对LSSS地震响应的影响。数值结果表明，地震动输入的不均匀性和多维性会极大地影响DICC的动力响应。对整体和局部结构位移，变形和力的具体影响程度进行了全面研究和讨论。