美国规范关于现浇钢筋混凝土双向 板楼盖结构的直.PDF

20 09 1 12 7 Fujian A rchitecture Co nstr uction N o1 2009 V ol 127 ( 361005) : 本文介绍了美国规范在设计双向板时采用的直 接设计法, 包括直 接设计法的 使用条件 总静 力弯矩及其 分配方式 合实例进行了计算, 得出了一些结论 : 现浇钢筋混凝土 双向板 直接设 计法 : T U 318 : A : 1004- 6135( 2009) 01- 0047- 03 并结 Direct Design Method Applied to Cast- in-situ Reinforced Concrete Two-way Slab Structure in American Code Cai Jun jie, Hao Yuan ( Depar tment o f Civil Engineering , X iamen U niv ersit y 361005) Abstract: T his essa y intro duce the dir ect design metho d used in ACI- 318, included the qualifications of direct desig n method, to- tal moment and how it is distr ibuted A nd g iv e an ex ample of the direct design method Keywords: cast- in- situ reinfor ced concrete tw o- w ay slab dir ect design method , ,, , , 1 2, , [2] ( 1) ( 2) ( 3) ( 4) ( 5) ( 6) , , ; , 3 , 10 % , , , , , [ 1] , 1 l22 / 2 l21 12 2 0 65l1 0 2~ 5 0 ; l2 ) ( l1 ; M0 , , , 2, 3 3 M0= ql 2 l 2 n 8 2 1/ 3 : , M U = 0 65M 0 M U = 0 35M 0 , ln ln , , , 2 : , 1984 : 2008- 10- 13 ,, , 1 1) M0 ( , 2009 1 127 A CI318- 05 , 1 M0 ( a) [2] 13 6 3 1 ( b) ( c) ( d) 5 ( e) ( a) ( c) ( e) 0 75 0 63 0 0 70 0 57 0 16 , ( b) , ( d) , , , 0 70 0 52 0 26 0 70 0 65 0 50 0 35 0 30 0 65 , 1, , 4 M0 1 , ,, , l2 / l1 E cb Ec s ; Ib Is 12 l1 l2 = E cb I b E cs I s , Ib b , 2 : , , , Is = bh3 / 12, , x , C= 1- 0 63 x y ;y , ,2 x3y 3 48 : 2 1 l2 / l1 85 % 1 l2 / l1= 0 1 l2 / l1 1 0 1l2 / l1= 0 1l2 / l1 1 0 1 l2 / l1= 0 1 l2 / l1 1 0 t= 0 t 25 t= 0 t 25 1 , l1 1 l2/ l1 0~ 1 , 05 75 90 100 75 100 90 60 90 l2 / l1 10 75 75 100 75 100 75 60 75 20 75 45 100 75 100 45 60 45 5 3, 12 0m m , g k= 8kN/ m2 , 500 m m , 300 600mm 400mm 400mm 600mm 600mm[ 3] 6000 8000mm, pk= 2kN / m2 , 30 0 C 30 400mm 600mm 2 : C t= E cb C 2EcsI s 3 51 q= 1 2gk + 1 4pk = 1 2 8+ 1 4 2 = 12 4( kN/ m2 ) ; 1: M0= q l2 l 2 n 8 = 1 8 12 4 4 ( 6- 0 3) 2 t ,t = 201 438( kN m) ; 2: M0 = 1 8 12 4 8 ( 6- 0 3) 2= 402 876( kN m) ; ,C A: M 0= 1 8 12 4 3 ( 8- 0 3) 2 = 275 699( kN m) ; 2009 1 127 B: M0 = 1 8 12 4 6 ( 8- 0 3) 2= 551 379( kN m) ; 52 ,