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1、第四节第四节 钢筋混凝土弯剪扭构件的构造要求钢筋混凝土弯剪扭构件的构造要求一、截面限制条件一、截面限制条件v矩形、矩形、T T形和工字形截面构件,形和工字形截面构件, 当当 时,最小截面尺寸,最小截面尺寸应满足:足:v意意义:构件尺寸不致太小,:构件尺寸不致太小,保保证构件破坏构件破坏时混凝土混凝土不首先被不首先被压碎碎。二、构造配筋界限二、构造配筋界限(简化计算)(简化计算) ( (当内力当内力满足一定的条件足一定的条件时,不需,不需计算配筋,只需构造配筋。算配筋,只需构造配筋。可大大可大大简化化计算)算) v矩形、矩形、T T形和工字形截面构件:形和工字形截面构件: 符合符合 则不不进行受
2、剪扭行受剪扭计算算,按构造要求配置箍筋。按构造要求配置箍筋。v当当 或或 时,剪力,剪力对构件承构件承载力的影响可不考力的影响可不考虑,按,按纯扭构件受扭承扭构件受扭承载力力计算算箍筋箍筋。按弯扭构件承。按弯扭构件承载力力计算算纵筋筋。v当当 时,扭矩,扭矩对构件承构件承载力的影响可不考力的影响可不考虑,按受弯正截面承,按受弯正截面承载力力计算算纵筋筋,按受剪承,按受剪承载力力计算算箍筋箍筋。 三、最小配筋率三、最小配筋率 (箍筋、纵筋)(箍筋、纵筋)1. 1. 最小配箍率最小配箍率 (防止(防止发生少筋的脆性破坏)生少筋的脆性破坏) 受剪扭的最小配箍率受剪扭的最小配箍率2. 2. 最小最小纵
3、筋配筋率筋配筋率v当当 时,不考,不考虑扭矩,最小扭矩,最小纵筋配筋率按筋配筋率按受弯构件考受弯构件考虑。最小配筋率取。最小配筋率取0.200.2045f45ft t/f/fy y的大的大者者,v当当 时,应考考虑弯矩和扭矩作用,最小配弯矩和扭矩作用,最小配筋率筋率为受弯构件的最小配筋率与受扭构件最小配筋受弯构件的最小配筋率与受扭构件最小配筋率之和。率之和。v受扭构件最小配筋率受扭构件最小配筋率v当当 时,取,取 v受扭筋受扭筋间距距200mm200mm,b b的小者的小者v受扭筋至少四角必受扭筋至少四角必须有,有,对称布置。称布置。Ast/3Ast/3Ast/313510d第五节第五节 弯、
4、剪、扭构件的设计计算方法弯、剪、扭构件的设计计算方法一、截面设计一、截面设计v已知:已知:M M、V V、T T,初,初选截面尺寸、材料等截面尺寸、材料等级,求:,求:纵筋和箍筋用量。筋和箍筋用量。1. 1. 计算几何参数算几何参数WtWt,U Ucorcor,A Acorcor2. 2. 验算适用条件(算适用条件(构造要求构造要求)(1 1)验算截面尺寸是否算截面尺寸是否满足。如不足。如不满足,足,则应加加大截面尺寸或提高混凝土大截面尺寸或提高混凝土强度等度等级。(2 2)验算构造配筋界限(算构造配筋界限(简化化计算条件)算条件)v如如 满足,不足,不进行剪扭构件承行剪扭构件承载力力计算,算
5、,箍筋按构造箍筋按构造 配置。配置。v如如 或或 时,可不考,可不考虑剪力的剪力的影响,构件按受弯、影响,构件按受弯、纯扭分扭分别计算。算。v如如 时,可不考,可不考虑扭矩的影响,构件按一扭矩的影响,构件按一般梁受弯受剪般梁受弯受剪计算。算。3. 3. 确定箍筋用量确定箍筋用量v按剪扭构件按剪扭构件计算,算,选取扭矩和剪力都取扭矩和剪力都较大的大的截面截面进行行计算。一般取算。一般取=1.2=1.2或或1.0;1.0;4. 4. 确定确定纵筋用量:按弯扭构件筋用量:按弯扭构件计算算5. 5. 验算最小配筋率:最小配箍率、最小算最小配筋率:最小配箍率、最小纵筋配筋配筋率筋率 二、截面承载力复核二
6、、截面承载力复核v已知截面尺寸、材料已知截面尺寸、材料强度等度等级、钢筋用量筋用量(总箍筋、箍筋、总纵筋),筋),M M、V V、T T,v求截面承求截面承载力力MuMu、VuVu、TuTu,使得,使得Mu M,Mu M,或或VuVVuV或或TuTTuT。acmNuLy1tSdXUdbViJ4KBVH3jrzQf4tp2E4KwFal9Uq+V$twaI-p#JUtLLzmgqYSjxzwxLou)Z(borbDwPh%HcCD64mRgL$XnkE4LgKVDVullme!e3lYDaw)U2YnHV1s47M!YNByMfh#f6(QlEqJe)WJjJG2XZ+alB8e!kDT5GvQ
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