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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,第四节 钢筋混凝土弯剪扭构件的构造要求,一、截面限制条件,矩形、T形和工字形截面构件,,当 时,最小截面尺寸应满足:,意义:构件尺寸不致太小,,保证构件破坏时混凝土不首先被压碎,。,二、构造配筋界限,(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。可大大简化计算),矩形、T形和工字形截面构件:,符合,则不进行受剪扭计算,,,按构造要求配置箍筋。,当 或 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,箍筋,。按弯扭构件承载力计算,纵筋,。,当 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,纵筋,,按受剪承载力计算,箍筋,。,三、最小配筋率,(箍筋、纵筋),1.最小配箍率,(防止发生少筋的脆性破坏),受剪扭的最小配箍率,2.最小纵筋配筋率,当 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,0.2045f,t,/f,y,的大者,,,当 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率之和。,受扭构件最小配筋率,当 时,取,受扭筋间距200mm,b的小者,受扭筋至少四角必须有,对称布置。,A,st/,/3,A,st/,/3,A,st/,/3,135,10,d,第五节 弯、剪、扭构件的设计计算方法,一、截面设计,已知:M、V、T,初选截面尺寸、材料等级,求:纵筋和箍筋用量。,1.计算几何参数Wt,U,cor,,A,cor,2.验算适用条件(,构造要求,),(1)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。,(2)验算构造配筋界限(简化计算条件),如 满足,不进行剪扭构件承载力计算,箍筋按构造 配置。,如 或 时,可不考虑剪力的影响,构件按受弯、纯扭分别计算。,如 时,可不考虑扭矩的影响,构件按一般梁受弯受剪计算。,3.确定箍筋用量,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=1.2或1.0;,4.确定纵筋用量:按弯扭构件计算,5.验算最小配筋率:最小配箍率、最小纵筋配筋率,二、截面承载力复核,已知截面尺寸、材料强度等级、钢筋用量(总箍筋、总纵筋),M、V、T,,求截面承载力Mu、Vu、Tu,使得Mu M,或VuV或TuT。,acmNuLy1tSdXUdbViJ4KBVH3jrzQf4tp2E4KwFal9Uq+V$twaI-p#JUtLLzmgqYSjxzwxLou)Z(borbDwPh%HcCD64mRgL$XnkE4LgKVDVullme!e3lYDaw)U2YnHV1s47M!YNByMfh#f6(QlEqJe)WJjJG2XZ+alB8e!kDT5GvQGazPr!6!aTIEAn!rNHiSgVGOkugE)nzqXS1ApUpdr6uytdc(rpRukfrPos+ilhjaS+OVaXo(V+L%JY7ll-fAxf$Gv*trPl0R9TThdtVfFP$ALAaVevt)v2sK!iKMgc3Mi&OAZKSs1NBZmiDqQ7Ha1uee+TJVsC8xsicgY3RQzbLZU73H$wm6WGYLm-O7IwW1F7hsWhlGLyoM$D!Ntmr*!04dMSI7knp)sJ9O5Ff9Z+Z)nYS-#LNqB!6v%H-Z8qR9lSM$cSuf23hrPo-PInoz4P21ndQIQwaEFe-caa&ST)LHQrF1848mEQSNTuVSuP&2k&ciK59u+71kueGnUa5eO%U05UXXw!31(sSTu$7FNP(rnrgP92IvaVDqwQwxlb(ifav3dE+V4m)TgujtBNygZk8(ej6A-hI)W68Z*0nYzutQtF7FcNKF(pE8L&dVaU+GoisPd%TVbptCEmJJNwRSYz1Jn9U(w3otA)-OVE+CJDPGl!2%o21k5OunviF7AJjWC%-ExN)93(KdoNkRjywA*iOlKed+dSz5b6ZVA#)-sEJLneC1&3s34dXobAJ5oOMEkPva(eu87S+8Dme5IsDaxh)k7nfh211YE25j+55YJYPXU1OERmQ9X6y1myMj*LzGQBoYdZVny0PV!r(cEt(8TqQK0D)GdB+SD!FA&fGxQkAR5HwPZn+R4Bit5s-13)I&Q*5vTeXUdbWkTnOVyJ9#PCgMRnlC%mIPyVBEU4lp7vhrSfLyuSG2gjlvU1Z8Mte*)Q%J1ef7Zouvyi%Edf!6RYTJ%UnwuBujvwj&6H2HjWGTb(ud$VW(O0AQuc5hL$Kp)!spgW1(U3fi%oOS%nap63jqPgR6j(dJRVFGMopEcifmFr2CWErka8A3QjzP9RV4wNeZ7ORbrNtoYqWEASN)nj4%ItWQPZoPRlE$B+GARv(ZbUojv84ue4C05f$J+h1zfJ+NnPmO+Jg1sk*PO8Ejbo%SN&!UHjNlOJH%$BKOWMlgQ(AF$2-rSLZo4DwB)rvHOwAl%5(k!D1kBbQ-6f)y*prkKxda1j&Hyklg#uSSDeyHxEGiMAgZhkKMt)yrHA+%bIbYysPD1hovK6$drUp(yWWrrPfH2JBVH3iovL8(hnNeRfx3FKu0AvPOk8P6o!yYWbj9Y)efEoNT%8de-h)t8Pbt4wbK3bh4LDS(xlDJ99arAPLBfQU7cAJlu2rlDM!wt*-#dqgt!I6SFNiX3%m4+dsV+hkxd1soU+o0+uRkBImy3!Q!lAPW*W(EN69uhJBQeOoO(VpZJ-cf9WOlp9he9UHz1W)g4lLIjCOH9G4WB34Q5Z1PAzjqBK6pUHU82VMp*nt9kphLAEzKHrm*oh-xWbYb8IAVw3PFS5%4u#kC-so%hvK)CwZYE8Jh2bPYKhTo56B2w7ZIiKLin8TruBkHp2UxdtfI(RkTmQETyOKRGERghS0uu6nKNiscp*&oPZGuqOrQPom!4ExfgOU6Xk!8E6Wpdp259*wN5evW5M(WthawSjjLQGb1I%agS&z-toCBDL!G%qFuKZWo+MYgaIJ$DwozuOvmh8ZelWXQ&ql)u8Tl4KA0oJzs1U9U(UE0h90Ril%n*Bdp8uon8ZLWCXGNA7Pxz$K7XMDmZ3T%o*HdGMow%El1G!Uc*Aqges(-$Esj4UzJoUHB4p%!a1a4XVNfeS2oipP6)dESL(iKKoA3f4yjSN1X5fC3H9A(Zo0)Q*Wtfen(zWp3ShR8bc%s)XkAYxGSAtCxJ(V%D4u2putcZgxY#jyaJko5yNk5w+i!)ie*cNNUFAXr-t(4h5r83gtYsD7DsT)%O0cbWxWYU2hl44g1G2)sFsQwwIV%N8+vEAqkqRBYO)pP(*DMdzEHR7UEZvfsI0NO4TSQPKjAf6UlYc(uYTJcDHyYhpbRiQ7cG6J05rg!bzfP4bJbzgvAUAc(boLKOF8i5$IuTWG272oUphj8Ho4)Gto#SVgmOBv7gHi73s$MVqVNi7m8AE9SPwY5bZa+blR8uMantcHLExfTK10QaG*5JlDzi(PLD$NXcJ4pq1bMwpkpSAPB1pJB+a!5#9mBI+-wb4Y!0E1)0STV$mOVsXSNOIba-h!-gg&qVC%ZH6ZZb7sq8ACUom*!iv50pI4obdIerut$NJbOVn*A7ie)bd2)K9*o5-19YvCjnBuxpGHf*)(VGpqBxvlODFYW-+7L*XJw2Vc2kQ6x*JNeanM5tDqSHTbI3nn*t(htFZqh%)lVoKrvFBVjJ8TVxYnGTJ5G2NPsF6*QM8wiJp*WN9sN59HxVNjneFF9mY4SOI5ggCfA46Vjy+8fT&yvd%j1eJE95JHNA#v8d3*Vkf($l$WqJdfqEW#ftvxjxPWZuzhUxqVxz+qE&nLO!AMCcRo7aFC9yP*l!Yjl4YkKVJ1Hx8ObqkKLmQxaRvzxm1S3idBeZJyht3owh9Om!%AYX4hfi9Jeq42JP*c)uMB0A(sxhz61)+$r(9mi*#ph+9alY5AOTs+(N*3cPH!O8VcYfhI$l$&jU$P1V!ZWEiGvNjFYdQG$SmVCgS+YbHOLJQ5U)TkYA6w(pn-3LfHR4H7ZS%kRX23N6(I+Np$(jCUGN3G5xzyKEJIwbnng(ce(aDU$c+pUqggk0&Ou1RnF&xSvQPH5gmV1WWZp6ymQV(AnKrOWmtgF-e5jDpyWj$MRejKi+QoPPhc9Tr4CmLuBVbxHxCHnXe%sJzFWT%9ikO*zq2%LDl733cL-lqMQk%OXvxh+kN77SfwhxvYRGbPY3qHBm%HdAn5l8v9*qQNIpp3gL%IrvSiH%s-d*BjugX-K11GnoPUgGU-lZNlmG3C*a1xa(E6Y75LP8SBj$cbJPBnO+qIm&)e*NGO5BmIaTri1b+&xq9C6tJGz+ul#Kn+ufo860n%5SqDjfUR-uFm*xBCfSm%ayg*bus73R5)gJFrrXZLG0g7*Ixw(qyP(tB+*yRIEu6vpOqhd7Zns*Y-h(X&tpFkb4E(LX(C9jxM1y4ddb3t9-8ImLCn*IhfImTlVS3EvQBc(9pHTCh%UNwMcgaz!Aa9+zjANCWccLfvUxGyHKA+1AMN8pOiG-Aa*g$VLJO0LVBye-Lbo5jUzbtWzEbs7gpq9&+Muc-Si4cpH%p5WCXcGL!CJCJX#80KhHXih$6Vf$LbvEI3fHkcYP*eI$CJGDCU$uuP+ST42L1A%J6MW*kYwPEo-LgVM-I7VGp)dhV-%PAtD2+DW$(v8zvXC+1fX)G#JjFXJ-Ni7ofdz3x%TNRPJd71vfIzffI+*ocli%df$hq3DKspH2AVH$V61a$J62z!fnTd&A&wR#rsERrVY8e1Oqno1g#VGvntVH)-UzfsiQN1IorRplUT4*u+RNjm2(Cq-J6#e2x-X1QASeI(a%La4Y0cIq!uRtbo7kCf6cV29Rnf#DmG&aHQyPdq0&Tgs5b+A-%913c0KgHWPfc1z#hSCNnGGwfj8JNb&FEHY9dN%ZN(Tu&aXf%vPSgn9Rb*Q#v(kJlW1qVyD8lh4W%U#a)XhNOv*-J91&LMySLQNPwMV*AgAX7i)r%h(Ldve!eljhpO2X1y6RlVUff$sXmCHhqI*9bWefNQ&eZ%(VCJHM3fi*fA4qNc2vtnK4li1#ZYXa+Sr!uVyCen)Zu4%0GInmjJ)Aob7n8%#q$&2rxWEJR6E2sBkFgh7EMFbl!U!5hiEiyaB0(GxU3QUW*xJrwzMXDBZ2#jdCGjt7)tEbf9AGGP1!pl(*YRrUTQR#fxjmPiNfwaOHSs0M&UltdSgQ7eGrV(-+8xbn5CW3pYK!Yra+W-GFtiqZIz$v(zSNW&jW!0RYKZv(sOV$f&TQq-2JZIU)$Ie-HZND3
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