（中南建筑设计院，武汉 430071）
［摘要］大跨度预应力次梁对主梁产生的扭矩与结构施工顺序有关。对武汉国际会展中心主楼32.0m×17.0m跨构成的双向正交部分预应力混凝土梁进行各个施工阶段的内力计算，表明主梁的抗扭设计不能简单地对主梁的扭矩乘以扭矩折减系数后进行配筋，而应先计算次梁在每个施工阶段对主梁产生的扭矩，然后进行叠加。同时也提出主梁所施加的预压力Np0对主梁抗扭是有利的，在设计中可考虑这一有利因素。
［关键词］正交；预应力次梁；预应力主梁；主梁扭矩
Design and analysis of orthogonal two-way long-span partially prestressed concrete beam
Cao Dengwu,Chen Yangui(Central-South Architectural Design Institute，Wuhan 430071,China)
Abstract:The torque of main beam that produced by long-span prestressed concrete secondary beam has a relationship with-construction sequence. Take Wuhan International Convention and Exhibition Centre as an example,it calculated internal force of each construction stage of orthogonal two-way(32.0m×17.0m) partially prestressed concreted beams.It indicates that in the torsional design of main beam,it should not simply multiply the torque of the main beam to the torque reduction factor before reinforcement.It should first calculate the torque of main beam generated by the secondary beam at each construction stage, and then superimpose.It also suggests that pre-pressure of main beam Np0 is favorable to torsion,this positive factor can be considered in design.
Keywords:orthogonal; prestressed secondary beam; prestressed main beam; torque of  main beam
作者简介：曹登武，副高，一级注册结构工程师，Email:znycaodw@163.com。
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