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（1 廣東工業(yè)大學(xué)工程學(xué)院 廣州 510640；2 貴州大學(xué)土建學(xué)院 貴陽(yáng) 550003）
【提要】 沿柱支承鋼扁網(wǎng)俊灸拉痢糠域施加適當(dāng)預(yù)應(yīng)力能降低結(jié)構(gòu)在使用階段的變形。以預(yù)應(yīng)力三階段設(shè)計(jì)為例分析預(yù)應(yīng)力施加對(duì)柱支承扁網(wǎng)殼靜力性能的影響。結(jié)果發(fā)現(xiàn)，預(yù)應(yīng)力可以降低支座水平推力，提高結(jié)構(gòu)剛度，但同時(shí)增大了結(jié)構(gòu)在負(fù)風(fēng)壓作用時(shí)的變形，加大了支座附近桿件的軸力。預(yù)應(yīng)力不能有效提高結(jié)構(gòu)的臨界荷載。
與其他布索方案相比，折線形索桁方案對(duì)網(wǎng)殼變形控制更有效。
【關(guān)鍵詞】 柱支承扁網(wǎng)殼 預(yù)【力 承浴寇力
Effect of Prestressing on Static Performance of Columnsupported Shallow Steel Lattice Shell Roofs/Xia Shaoquan1，Xiao Jianchun2(1 Faculty of Electromechanical Engineering, Gu
angdong University of Technology, Guangzhou 510090,China; 2  Department of Civil  Engineering,  Guizhou University, Guiyang 550003,China)
Abstract:It can efficiently control the structural deformation at serve period by suitablyprestressing a shallow steel lattice shell along its tension stress trajectories. The effect of practical prestressing on the static specialties of a kind of columnsupported lattice shallow spherical shells is studied through the example of threephase prestressing design. Analysis results show that: 1) suitably prestressing a columnsupported shallow shell can well control the deformation of the shell and can lower its bend moment at edge regions, but the internal force of many bars close to the shell supports are significantly enlarged; 2) prestressing cannot efficiently increase the critical load and significantly change the relationship curve of loaddisplacement; 3) it can control the deformation of the shell effectively by employing zigzagstring truss.
Keywords:columnsupported shallow lattice shell roofs; prestressing; bearing capability