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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,最小截面尺寸应满足:时,最小截面尺寸应满足:v意义:构件尺寸不致太小,意义:构件尺寸不致太小,保证构件破坏时混凝土保证构件破坏时混凝土不首先被压碎不首先被压碎。二、构造配筋界限二、构造配筋界限(简化计算)(简化计算)(当内力满足一定的条件时,不需计算配筋,只需构造配筋。当内力满足一定的条件时,不需计算配筋,只需构造配筋。可大大简化计算)可大大简化计算)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
2、则不进行受剪扭计算则不进行受剪扭计算,按构造要求配置箍筋。按构造要求配置箍筋。v当当 或或 时,剪力对构件承载时,剪力对构件承载力的影响可不考虑,按纯扭构件受扭承载力计算力的影响可不考虑,按纯扭构件受扭承载力计算箍筋箍筋。按弯扭构件承载力计算。按弯扭构件承载力计算纵筋纵筋。v当当 时,扭矩对构件承载力的影响可不考时,扭矩对构件承载力的影响可不考虑,按受弯正截面承载力计算虑,按受弯正截面承载力计算纵筋纵筋,按受剪承,按受剪承载力计算载力计算箍筋箍筋。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 (防止发生少筋的脆性破坏)(防止发生少筋的脆性破坏)受剪扭的最
3、小配箍率受剪扭的最小配箍率2.2.最小纵筋配筋率最小纵筋配筋率v当当 时,不考虑扭矩,最小纵筋配筋率按时,不考虑扭矩,最小纵筋配筋率按受弯构件考虑。最小配筋率取受弯构件考虑。最小配筋率取0.200.2045f45ft t/f/fy y的大的大者者,v当当 时,应考虑弯矩和扭矩作用,最小配时,应考虑弯矩和扭矩作用,最小配筋率为受弯构件的最小配筋率与受扭构件最小配筋筋率为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,取时,取 v受扭筋间距受扭筋间距200mm200mm,b b的小者的小者v受扭筋至少四角必须有,对称布置。受扭筋至少四角必须有
4、,对称布置。Ast/3Ast/3Ast/313510d第五节第五节 弯、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,初选截面尺寸、材料等级,求:,初选截面尺寸、材料等级,求:纵筋和箍筋用量。纵筋和箍筋用量。1.1.计算几何参数计算几何参数WtWt,U Ucorcor,A Acorcor2.2.验算适用条件(验算适用条件(构造要求构造要求)(1 1)验算截面尺寸是否满足。如不满足,则应加)验算截面尺寸是否满足。如不满足,则应加大截面尺寸或提高混凝土强度等级。大截面尺寸或提高混凝土强度等级。(2 2)验算构造配筋界限(简化计算条
5、件)验算构造配筋界限(简化计算条件)v如如 满足,不进行剪扭构件承载力计算,满足,不进行剪扭构件承载力计算,箍筋按构造箍筋按构造 配置。配置。v如如 或或 时,可不考虑剪力的时,可不考虑剪力的影响,构件按受弯、纯扭分别计算。影响,构件按受弯、纯扭分别计算。v如如 时,可不考虑扭矩的影响,构件按一时,可不考虑扭矩的影响,构件按一般梁受弯受剪计算。般梁受弯受剪计算。3.3.确定箍筋用量确定箍筋用量v按剪扭构件计算,选取扭矩和剪力都较大的按剪扭构件计算,选取扭矩和剪力都较大的截面进行计算。一般取截面进行计算。一般取=1.2=1.2或或1.0;1.0;4.4.确定纵筋用量:按弯扭构件计算确定纵筋用量:
6、按弯扭构件计算5.5.验算最小配筋率:最小配箍率、最小纵筋配验算最小配筋率:最小配箍率、最小纵筋配筋率筋率 二、截面承载力复核二、截面承载力复核v已知截面尺寸、材料强度等级、钢筋用量已知截面尺寸、材料强度等级、钢筋用量(总箍筋、总纵筋),(总箍筋、总纵筋),M M、V V、T T,v求截面承载力求截面承载力MuMu、VuVu、TuTu,使得,使得Mu M,Mu M,或或VuVVuV或或TuTTuT。+-YwPzL8Qr(mp(+o!A5zIoC6#TLt&5QU7F5zOF+Y0pTaohQN+BbUjAqQyzKX%Tmr!MKNMy-4HzGV-1Ve6q$EhXcdRO)s!lCx)&f
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