挑檐计算书(总3页)
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挑檐计算
阳台雨蓬挑檐计算书
项目名称_____________构件编号_____________
设 计_____________校 对_____________审核_____________ 计算时间 2014年12月10日(星期三)10:44
一、基本资料
1.设计规范: 《建筑结构荷载规范》(GB50009-2012) 《混凝土结构设计规范》(GB50010-2010) 《砌体结构设计规范》(GB50003—2001) 2.设计参数: 几何信息 荷载信息 类型: 挑檐 板端集中活载标准值Pk:
1.10kN/m 梁宽bb: 200mm
板上均布活载标准值qk: 梁高hb: 1078mm
2
0.50kN/m 挑板宽L: 1500mm
板上均布恒载标准值gk: 伸板宽bt: 2100mm
2
7.10kN/m 伸板厚ht: 120mm
伸板上均布活载标准值qk1: 梁槛高ha: 0mm
2
0.50kN/m 梁槛宽ba: 0mm
伸板上均布恒载标准值gk1: 墙厚bw: 200mm
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2.00kN/m 板下沉h0: 550mm
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混凝土容重gL: 25.00kN/m 板斜厚h1: 0mm
恒载分项系数gG: 1.20 板净厚h2: 150mm
活载分项系数gQ: 1.40 第一排纵筋至梁近边距离as: 25mm
指定梁上抗倾覆荷载Gr: 160.00kN/m 材料信息 混凝土等级: C30
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混凝土强度设计值fc: 14.30N/mm 主筋级别: HRB400
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主筋强度设计值fy: 360N/mm 箍筋级别: HPB300
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强度设计值fyv: 270N/mm 墙体材料: 砖
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砌体抗压强度设计值f: 1.700N/mm
二、计算过程
1.荷载计算
1.1 计算x0 x0 = 0.13l1, L1 = bw x0 = 26.00mm 1.2 倾覆荷载计算 qT = gG(gk + gT) + gQqk = 1.20×(7.10 + 3.75) + 1.40×0.50 =
2
13.720kN/m PT = gGgF + gQPk = 1.20×0.00 + 1.40×1.10 = 1.54kN/m 倾覆力矩
1
MOV = qT(L + x0)2 + PT(L + x0)
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2
= 18.32kN·m 1.3 挑板根部的内力计算 MTmax = MOV = 18.32kN·m VTmax = qTL + pT = 13.72×1500/103 + 1.54 = 22.12kN/m 1.4 伸板根部内力计算 gS = gLht/103 = 25.00×120/1000 = 3.00kN/m2 qS = gG(gk1 + gS) + gQqk1
2
= 1.20×(2.00 + 3.00) + 1.40×0.50 = 6.70kN/m
112
MSmax = qsb2t = ×6.70×4 = 14.77kN·m
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VSmax = qsbt = 6.70×2100 = 14.07kN 2.抗倾覆验算 l1 = bw = 200mm l2 = 0.5l1 = 100mm Gr产生的抗倾覆力矩 MrG = 0.8Gr(L2 - x0) = 0.8 × 160.00 × (100 - 26.0) = 9.472kN·m 过梁自重产生的抗倾覆力矩 MrL = 0.8×gL(0.5bb - x0) = 0.8 × 5.39 × (0.5 × 200 - 26.0) = 0.319kN·m 伸板产生的抗倾覆力矩 MrS = 0.8(gS + gk1)bt(0.5bt + bb - x0) = 0.8 × (3.00 + 2.00) × 2100 × (0.5 × 2100 + 200 - 26.0) = 10.282kN·m 总的抗倾覆力矩 Mr = MrG + MrL + MrS = 9.472 + 0.319 + 10.282 = 20.073kN·m> Mov = 18.325kN·m , 满足抗倾覆要求 3.挑板相关计算 3.1 挑板截面尺寸验算 h = h1 + h2 = 0 + 150 = 150mm h0 = h - as = 150 - 25 = 125mm
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0.25bcfcbh0 = 0.25×1.00×14.30×1000×125 = 446.9×10N Vmax = 22.12kN < 446.9kN, 截面尺寸满足要求 3.2 挑板截面负筋计算 3.2.1相对界限受压区高度xb ecu = 0.0033 - (fcu,k - 50)×10-5 = 0.0033 - (30 - 50)×10-5 = 0.0035 > 0.0033 取 ecu = 0.0033
b10.80
xb = = =0.52
fy3601 + 1 + 5
Esecu2.0×10×0.00330
3.2.2 受压区高度x A's = 0, A'p = 0
xM = a1fcbxh0 -
2
x = h0 - h - = 125 - a1fcb20
2M2×18.32×10
125 - =1.00×14.30×1000
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610.71mm 3.2.3 受拉钢筋截面积As
3
得
3.3 挑板分布钢筋计算 按照最小配筋率计算 最小配筋率 AsTbfb = rmin(h1 + 2h2)L/2 = 0.0020×(0 + 2×150)×1500/2 =
2
450.00mm 实际挑板分布钢筋配置,取直径为10mm,间距为200mm 4.伸板相关计算 4.1 伸板截面负筋计算 4.1.1相对界限受压区高度xb ecu = 0.0033 - (fcu,k - 50)×10-5 = 0.0033 - (30 - 50)×10-5 = 0.0035 > 0.0033 取 ecu = 0.0033
b10.80
xb = = =0.52
fy3601 + 1 + 5
Esecu2.0×10×0.00330
4.1.2 受压区高度x A's = 0, A'p = 0
a1fcbx = fyAs
a1fcbx1.00×14.30×1000×10.712
As = = =425mm
fy360
As> Asmin = rminA = 0.0020×150000 = 300mm2
xM = a1fcbxh0 -
2
x = h0 - h - = 95 - a1fcb20
2M2×14.77×10
95 - =
1.00×14.30×1000
2
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11.58mm 4.1.3 受拉钢筋截面积As a1fcbx = fyAs
a1fcbx1.00×14.30×1000×11.582
得 As = = =460mm
fy360
As> Asmin = rminA = 0.0020×120000 = 240mm2 4.2 伸板分布钢筋计算 按照最小配筋率计算 最小配筋率 AsShbfb = rminhtbt = 0.0020×120×2100 = 504.00mm2 实际伸板分布钢筋配置,取直径为10mm,间距为200mm 5.过梁截面配筋相关计算 5.1 计算过梁箍筋
ft1.43
rsv,min = 0.28 = 0.28× = 0.148%
fyv270
Asvmin = rsv,minb = 0.148% × 200 = 0.297mm2/mm s
取采用双肢箍筋(n=2),箍筋间距为330mm,箍筋直径为8mm相应的配筋率为 rsv = Asv/bs = 2×50.3/(200×330) = 0.152% > rsv,min = 0.148% 满足要求
5.2 计算过梁纵筋 按照最小配筋率计算 AsGL = rminhbbb = 0.0020×1078×200 = 431.20mm2 A'sGL = AsGL = 431.20mm2
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过梁纵筋实际配置:
腹板顶部纵向钢筋实际配筋:4D12 腹板底部纵向钢筋实际配筋:4D12
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