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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。
The torque generated by the long-span prestressed secondary beams on the main beam is related to the construction sequence. The calculation of internal forces at each construction phase of a bidirectional orthogonal partially prestressed concrete beam with a span of 32.0m × 17.0m in the main building of Wuhan International Convention and Exhibition Center shows that the torsional design of the main girder can not simply multiply the torque of the main girder by the torque reduction After the coefficient of reinforcement, but should be calculated in the construction of secondary beams in each stage of the main beam torque, and then superimposed. At the same time, it is also proposed that the pre-pressure Np0 exerted by the main beam is favorable to the torsion of the main beam, and this favorable factor can be considered in the design.