小计: 3.61kN/m2
均布活荷载标准值:卫生间2.5 kN/m2;住宿房间2.0 kN/m2;走廊、及楼梯3.5 kN/m2;储藏室5.0 kN/m2;
荷载设计值:
B1、B2、B3、B5、B7、B8板
g=1.2×3.61=4.332kN/m2 ,q=1.4×2.0=2.8kN/m2
q/2=1.4kN/m2,g+q/2=5.732kN/m2,g+q=7.132kN/m2
B10~B14板
g=1.2×3.61=4.332kN/m2 ,q=1.4×3.5=4.9kN/m2
q/2=2.45kN/m2,g+q/2=6.782kN/m2,g+q=9.232kN/m2
B4板(活载大于4.0 kN/m2,分项系数取1.3)
g=1.2×3.61=4.332kN/m2 ,q=1.3×5.0=6.5kN/m2
q/2=3.25kN/m2,g+q/2=7.582kN/m2,g+q=10.832kN/m2
B6、B9板
g=1.2×4.46=5.352kN/m2 ,q=1.4×2.5=3.5kN/m2
q/2=1.75kN/m2,g+q/2=7.102kN/m2,g+q=8.852kN/m2
2)弯矩计算
B9~B12为单向板,取1m板带进行计算,跨中弯矩:
其余为双向板,计算过程见表4.5
3)截面设计:
材料:
C30混凝土, 10或 12钢筋,
截面有效高度:
方向跨中截面的
方向跨中截面的
支座截面的
最小配筋率:
因为 ,故取ρsmin=0.215%,则Asmin=0.215%×1000×100=215mm2
截面设计时取用的弯矩设计值不考虑板的穹顶作用,弯矩设计值不折减,作为安全储备。为了便于计算,近似取γ=0.95,
计算过程见表4.5、表4.6和表4.7。
表4.5 二层楼盖弯矩值计算表
l01 (m) l02 (m) l01/l02 (kN•m)
(kN•m) (kN•m) (kN•m)
B1 4 5.5 0.727 (0.0407+0.2×0.0181) ×5.732×42+(0.0649+0.2×0.0307) ×1.4×42=5.656 (0.0181+0.2×0.0407) ×5.732×42+(0.0307+0.2×0.0649) ×1.4×42=3.385 -0.0963×7.132×42=-10.989 0 -0.0765×7.132×42=-8.730 0
B2 4 5.5 0.727 (0.0340+0.2×0.0102) ×5.732×42+(0.0649+0.2×0.0307) ×1.4×42=4.897 (0.0102+0.2×0.0340) ×5.732×42+(0.0307+0.2×0.0649) ×1.4×42=2.538 -0.0761×7.132×42=-8.684 -8.684 -0.0572×7.132×42=-6.527 0
B3 4.25 5.5 0.773 (0.0321+0.2×0.0116) ×5.732×4.252+(0.0593+0.2×0.0325) ×1.4×4.252=5.227 (0.0116+0.2×0.0321) ×5.732×4.252+(0.0325+0.2×0.0593) ×1.4×4.252=2.987 -0.0737×7.132×4.252=-9.494 -9.494 -0.0571×7.132×4.252=-7.356 0
B4 4 8 0.500 (0.0559+0.2×0.0079) ×7.582×42+(0.0965+0.2×0.0174) ×3.25×42=12.172 (0.0079+0.2×0.0559) ×7.582×42+(0.0174+0.2×0.0965) ×3.25×42=4.223 -0.1179×10.832×42=-20.433 0 -0.0786×10.83×42=-15.182 0
B5 1.7 2.5 0.680 (0.0357+0.2×0.0086) ×5.732×1.72+(0.0710+0.2×0.0286) ×1.4×1.72=0.930 (0.0086+0.2×0.0357) ×5.732×1.72+(0.0286+0.2×0.0710) ×1.4×1.72=0.434 -0.0783×7.132×1.72=-1.614 -1.614 -0.0572×7.132×1.72=-1.179 0 高校接待中心建筑与结构设计(6):http://www.751com.cn/gongcheng/lunwen_8127.html