介绍了路口人行天桥采用的正交预应力系杆空间刚架的特征、静动力分析和结构设计.用系杆对整个刚架施加预应力,用支座使空间刚架实现完全对称、减震、消能,经体系转换,将分段预制的构件组成空间刚架.采用空间梁单元建模,进行了自振频率核算及地震力计算,并进行了截面、岔口区域及刚架角隅的设计,可供同类设计时参考. The characteristics, static and dynamic analysis and structural design of the orthogonal prestressed tie-rod spatial rigid frame adopted at the intersection pedestrian bridge are introduced.The prestressing force is applied to the whole rigid frame by the tie rod, the symmetry of the space rigid frame is achieved by the support, and the damping , Energy dissipation, the system is transformed, the prefabricated pieces of the composition of the space frame.Using the spatial beam element modeling, the calculation of natural frequency and seismic force calculation, and the cross section, fork region and rigid frame corner Design, reference for similar design.