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（中南建筑設(shè)計(jì)院，武漢 430071）
［摘要］大跨度預(yù)應(yīng)力次梁對(duì)主梁產(chǎn)生的扭矩與結(jié)構(gòu)施工順序有關(guān)。對(duì)武漢國(guó)際會(huì)展中心主樓32.0m×17.0m跨構(gòu)成的雙向正交部分預(yù)應(yīng)力混凝土梁進(jìn)行各個(gè)施工階段的內(nèi)力計(jì)算，表明主梁的抗扭設(shè)計(jì)不能簡(jiǎn)單地對(duì)主梁的扭矩乘以扭矩折減系數(shù)后進(jìn)行配筋，而應(yīng)先計(jì)算次梁在每個(gè)施工階段對(duì)主梁產(chǎn)生的扭矩，然后進(jìn)行疊加。同時(shí)也提出主梁所施加的預(yù)壓力Np0對(duì)主梁抗扭是有利的，在設(shè)計(jì)中可考慮這一有利因素。
［關(guān)鍵詞］正交；預(yù)應(yīng)力次梁；預(yù)應(yīng)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
作者簡(jiǎn)介：曹登武，副高，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email:znycaodw@163.com。
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