双向板按弹性方法计算实例1.楼盖平面布置双向板肋形楼盖梁板结构布置如图1,钢筋混凝土板厚150hmm,楼面面层为20mm厚水泥砂浆抹面(320/kNm),板底为15mm厚石灰砂浆粉刷(317/kNm)活载标准值25.4/kqkNm,混凝土为35C级,板中受力筋及分布筋采用HPB300级钢筋;梁中受力筋采用HRB335级钢筋;梁中箍筋和架立筋采用HPB300级钢筋。柱距为6900mm,板的弯矩折减系数为:B1为0.8;B2,B3均为1.0123456ABCDB1B1B1B2B2B3B2B2B3B2B3B2B2B3B2aabbbdbbddbbbdddccdccdLxLy图1楼盖平面布置2.板的荷载计算恒载】厚水泥砂浆抹面200.020.4KN/2m150mm钢筋混凝土板200.153.75KN/2m15mm石灰砂浆170.0150.26KN/2m标准值0.43.750.26=4.41kgKN/2m活载标准值5.4kqKN/2m可变荷载效应起控制作用,1.2G1.3Q设计值1.24.415.292gKN/2m,设计值1.35.47.02qKN/2m荷载设计值5.2927.0212.312pgqKN/2m/25.2927.02/28.80pgqKN/2m/27.02/23.51pqKN/2m3.板的内力计算及配筋2270/yfNmm,min0.45/0.451.57/2700.262%tyff2,minmin0.002621000150393sAbhmm3.1中间区格板1B计算跨度:6.9xlm6.9ylm/1.0xyll单位板宽弯矩(/KNmm)跨中弯矩:荷载按棋盘布xM=系数(6)2xpl+系数(1)2xpl=(0.02058.800.04293.51)26.915.76yM=系数(6)2xpl+系数(1)2xpl=(0.02058.800.04293.51)26.915.76注:10.02050.01760.01766,10.04290.03680.03686,泊松比16支座弯矩:荷载按满布a支座axM=系数(6)2xpl=20.051312.3126.930.07b支座byM=系数(6)2xpl=20.051312.3126.930.07配筋计算:s=0.95,0130xhmm,0120yhmm。跨中正弯矩配筋选用HPB300钢,跨中截面:62,min00.80.815.76103782700.95130xsxsysxMAmmAfh6200.80.815.76104102700.95120ysyysyMAmmfh实配钢筋28/10@150,429mm(x,y方向相同)a支座6200.80.830.07107212700.95130aaxsxysxMAmmfh实配钢筋212@150,754mm3.2边区格板2B计算跨度:6.9xlm,6.90.120.150.36.93ylm,/1xyll单位板宽弯矩(/KNmm)跨中弯矩:荷载按棋盘布(/KNmm)xM=系数(5)2xpl+系数(1)2xpl=2(0.02618.800.04293.51)6.918.11yM=系数(5)2xpl+系数(1)2xpl=2(0.02198.800.04293.51)6.916.34支座弯矩:荷载按满布b支座byM=系数(5)2xpl=20.0512.3126.929.31c支座cxM=系数(5)2xpl=20.0612.3126.935.17d支座dxM=系数(5)2xpl=20.0612.3126.935.17配筋计算:跨中截面62018.11105432700.95130xsxysxMAmmfh62016.34105312700.95120ysyysyMAmmfh实配钢筋210/12@150,639mm(x,y方向相同)支座截面b支座支座弯矩取板2B与板1B计算中的较大值30.07/KNmm6230.07109772700.95120bsyAmm实配钢筋210@75,1047mmc支座6235.171010552700.95130csxAmm实配钢筋210/12@75,1277mmd支座配筋计算见3B3.3角区格板3B计算跨度:6.90.120.150.36.93xlmm,6.93ylmm,/1.0xyll单位板宽弯矩(/KNmm)跨中弯矩:荷载按棋盘布(/KNmm)xM=系数(4)2xpl+系数(1)2xpl=2(0.02818.80.04293.51)6.9319.11yM=系数(4)2xpl+系数(1)2xpl=2(0.02898.80.04293.51)6.9319.45支座弯矩:荷载按满布d支座dxM=系数(4)2xpl=20.067712.3126.9340.03配筋计算:跨中截面62019.11105732700.95130xsxysxMAmmfh62019.45106322700.95120ysyysyMAmmfh实配钢筋210/12@150,639mm(x,y方向相同)d支座62040.031012002700.95130ddxsxysxMAmmfh实配钢筋210/12@75,1277mm