[精品]第四節(jié) 鋼凝土彎剪扭構件的構造要求

1、第四節(jié)第四節(jié) 鋼筋混凝土彎剪扭構件的構造要求鋼筋混凝土彎剪扭構件的構造要求一、截面限制條件一、截面限制條件v矩形、矩形、t t形和工字形截面構件，形和工字形截面構件， 當當 時，最小截面尺寸應滿足：時，最小截面尺寸應滿足：v意義：構件尺寸不致太小，意義：構件尺寸不致太小，保證構件破壞時混凝土保證構件破壞時混凝土不首先被壓碎不首先被壓碎。/6whb 00.250.8cctvtfbhw二、構造配筋界限二、構造配筋界限（簡化計算）（簡化計算） ( (當內力滿足一定的條件時，不需計算配筋，只需構造配筋。當內力滿足一定的條件時，不需計算配筋，只需構造配筋?？纱蟠蠛喕嬎悖┛纱蟠蠛喕嬎悖?v矩形、矩形、

2、t t形和工字形截面構件：形和工字形截面構件： 符合符合 則不進行受剪扭計算則不進行受剪扭計算，按構造要求配置箍筋。按構造要求配置箍筋。00.7ttvtfbhwv當當 或或 時，剪力對構件承載時，剪力對構件承載力的影響可不考慮，按純扭構件受扭承載力計算力的影響可不考慮，按純扭構件受扭承載力計算箍筋箍筋。按彎扭構件承載力計算。按彎扭構件承載力計算縱筋縱筋。v當當 時，扭矩對構件承載力的影響可不考時，扭矩對構件承載力的影響可不考慮，按受彎正截面承載力計算慮，按受彎正截面承載力計算縱筋縱筋，按受剪承，按受剪承載力計算載力計算箍筋箍筋。 00.35tvf bh00.8751.0tvf bh0.175t

3、ttfw三、最小配筋率三、最小配筋率 （箍筋、縱筋）（箍筋、縱筋）1. 1. 最小配箍率最小配箍率 （防止發(fā)生少筋的脆性破壞）（防止發(fā)生少筋的脆性破壞） 受剪扭的最小配箍率受剪扭的最小配箍率2. 2. 最小縱筋配筋率最小縱筋配筋率v當當 時，不考慮扭矩，最小縱筋配筋率按時，不考慮扭矩，最小縱筋配筋率按受彎構件考慮。最小配筋率取受彎構件考慮。最小配筋率取0.200.2045f45ft t/f/fy y的大的大者者，v當當 時，應考慮彎矩和扭矩作用，最小配時，應考慮彎矩和扭矩作用，最小配筋率為受彎構件的最小配筋率與受扭構件最小配筋筋率為受彎構件的最小配筋率與受扭構件最小配筋率之和。率之和。10.2

4、8/svsvtyvnaffbs0.175tttfw0.175tttfwv受扭構件最小配筋率受扭構件最小配筋率v當當 時，取時，取 v受扭筋間距受扭筋間距200mm200mm，b b的小者的小者v受扭筋至少四角必須有，對稱布置。受扭筋至少四角必須有，對稱布置。min0.6stlttltlyaftbhvbf2 .0tv b2.0tvbast/3ast/3ast/313510d第五節(jié)第五節(jié) 彎、剪、扭構件的設計計算方法彎、剪、扭構件的設計計算方法一、截面設計一、截面設計v已知：已知：m m、v v、t t，初選截面尺寸、材料等級，求：，初選截面尺寸、材料等級，求：縱筋和箍筋用量。縱筋和箍筋用量。1.

5、 1. 計算幾何參數計算幾何參數wtwt，u ucorcor，a acorcor2. 2. 驗算適用條件（驗算適用條件（構造要求構造要求）（1 1）驗算截面尺寸是否滿足。如不滿足，則應加）驗算截面尺寸是否滿足。如不滿足，則應加大截面尺寸或提高混凝土強度等級。大截面尺寸或提高混凝土強度等級。00.250.8cctvtfbhw（2 2）驗算構造配筋界限（簡化計算條件）驗算構造配筋界限（簡化計算條件）v如如 滿足，不進行剪扭構件承載力計算，滿足，不進行剪扭構件承載力計算，箍筋按構造箍筋按構造 配置。配置。v如如 或或 時，可不考慮剪力的時，可不考慮剪力的影響，構件按受彎、純扭分別計算。影響，構件按受

6、彎、純扭分別計算。v如如 時，可不考慮扭矩的影響，構件按一時，可不考慮扭矩的影響，構件按一般梁受彎受剪計算。般梁受彎受剪計算。000.7tvtfbhw,mintl00.35tvf bh00.8751.0tvf bh0.175tttfw3. 3. 確定箍筋用量確定箍筋用量v按剪扭構件計算，選取扭矩和剪力都較大的按剪扭構件計算，選取扭矩和剪力都較大的截面進行計算。一般取截面進行計算。一般取=1.2=1.2或或1.0;1.0;4. 4. 確定縱筋用量：按彎扭構件計算確定縱筋用量：按彎扭構件計算5. 5. 驗算最小配筋率：最小配箍率、最小縱筋驗算最小配筋率：最小配箍率、最小縱筋配筋率配筋率 二、截面承

7、載力復核二、截面承載力復核v已知截面尺寸、材料強度等級、鋼筋用量已知截面尺寸、材料強度等級、鋼筋用量（總箍筋、總縱筋），（總箍筋、總縱筋），m m、v v、t t，v求截面承載力求截面承載力mumu、vuvu、tutu，使得，使得mu m,mu m,或或vuvvuv或或tuttut。hpdmaj7f4c0z)w&s!pymujrfocl9h6e3b+y(u%r#owltiqenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&a

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29、i7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qynvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rznwkthpembj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$rznwkskshpemaj7g4c1z)w&t!pymvjrgocl9i6e3b0y(v%r#oxltiqfnbk8g5d2a-x*u$qznvkshpdmaj7f4c0z)w&s!pymujrfocl9h6e3b+y(v%r#ow

30、ltiqenbk8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmujrfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0z)v&s#pxmuirfock9h5e2b+x(u%rzowkthqembj8g4d1z-w*t!qynvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodl9i6f3b0y)v%s#oxluiqfnck8h5d2a+x*u$rznwkshpemaj7g4c1z)w&

31、;t!pymvjrgocl9i6e3b0y(v%s#oxltiqfnbk8h5d2a-x*u$qznwkshpdmaj7f4c1z)w&s!pymujrgocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owlthqenbj8g5d1a-w*t$qynvksgpdlai7f3c0z)v&s#pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxluirfnck9h5

32、e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodlai6f3b0y)v%s#pxluiqfnck8h5e2a+x*u$rznwkthpemaj7g4c1z-w&t!pymvjrgodl9i6e3b0y(v%s#oxltiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!p!pymujrgocl9i6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owltiqenbj8g5d1a-x*t$qynvks

33、gpdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3b0y)v%s#pxluiqfnck8h5e2a+x*u$rznwkthpembj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b0y(v%r

34、#oxltiqfnbk8g5d2a-x*u$qznvkshpdmaj7f4c0z)w&s!pymujrfocl9h6e3b+y(u%r#owltiqenbj8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmujrfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u%rzowkthqembj8g4d1z-w*t!qynvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rznwkthpembj7g4c1z-w&

35、amp;t!qymvjsgodl9i6f3b0y)v%s#oxluiqfnck8h5d2a+x*u$rznwkshpemaj7g4c1z)w&t!pymvjrgoclcl9i6e3b0y(v%r#oxltiqfnbk8g5d2a-x*u$qznvkshpdmaj7f4c1z)w&s!pymujrgocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmujrfock9h6e2b+y(u%r#owlthqenbj8g5d1a-w*t$qynvksgpdlai7f3c0z)v&s#pxmuirfo

36、ck9h5e2b+x(u%rzowkthqembj8g4d1z-w*t!qynvjsgodlai6f3c0y)v&s#pxluirfnck9h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodl9i6f3b0y)v%s#oxluiqfnck8h5d2a+x*u$rznwkthpemaj7g4c1z-w&t!pymvjrgodl9i6e3b0y(v%s#oxltiqfnbk8h5d2a-x*u$qznwkshpdmaj7f4c1z)w&s!pymujrgocl9h6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qzn

37、vkshpdmai7f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owlthqenbj8g5d1a-w*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxluirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3b0y)v%s#pxluiqfnck8h5e2a+x*u$rznwkthpemaj7g4c1z-w&t!pymvjrgodl9i6f3b0y(v%s%s#oxluiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmaj7f4c0z)w&s!pymujrfocl9h6e3b+y(u%r#owltiqen