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  王依群  康谷貽     （天津大學(xué)建筑工程學(xué)院 300072）

[提要]  從受剪和受純扭構(gòu)件最小配筋率入手，通過(guò)理論分析，給出了箱形截面剪-扭構(gòu)件最小配筋率計(jì)算公
式，并與實(shí)芯截面和規(guī)范GB50010-2002計(jì)算公式進(jìn)行了比較。理論分析表明，箱形截面剪-扭構(gòu)件最小受扭縱筋配筋率宜計(jì)及箱形截面的特性。在未作進(jìn)一步研究前，可偏安全地取與實(shí)芯截面相同。
[關(guān)鍵詞]  鋼筋混凝土  箱形截面構(gòu)件  扭轉(zhuǎn)  配筋率

From the minimum ratio of reinforcement for the members under shear and pure torsion, through theory analysis, the calculation formula for the minimum ratio of stirrup in the box cross-section members under shear and torsion is presented. It is compared with those in Code for design of concrete structures ( GB50010-2002). The results of theoretic analysis show that the characteristic of box cross-section should be considered in the calculation of the minimum reinforcement ratio of longitudinal bars for box cross-section members under shear and torsion.
Keywords:  RC box cross-section; members; torsion;reinforcement ratio