钢筋桁架叠合板计算书excel简支

钢筋桁架叠合板计算书（简支）,,,,,,,,,

砼等级,C25,,,,,,,,

砼标号,fc,fck,ft,ftk,Ec,,,,

C25,11.9,16.7,1.27,1.78,2.8,,,,

主筋等级,HRB400,,,,腹筋等级,HRB400,,,

牌号,抗拉fy,抗压fy',标准fyk,弹模Es,牌号,抗拉fy,抗压fy',标准fyk,弹模Es

HRB400,360,360,400,2,HRB400,360,360,400,2

,,,,,,,,,,

一、设计数据,,,,,,,,,

1、基本数据,,,,,,,,,

施工阶段结构重要性系数,,,0.9,,次梁间距l=,,,3000,mm

使用阶段结构重要性系数,,,1,,楼板厚度h=,,,110,mm

永久荷载分项系数,,,1.2,,左支承梁上翼缘宽度,,,200,mm

可变荷载分项系数,,,1.4,,右支承梁上翼缘宽度,,,200,mm

混凝土上保护层厚度,,,15,mm,模板在梁上的支承长度a=,,,50,mm

混凝土下保护层厚度,,,15,mm,单榀桁架计算宽度b=,,,188,mm

桁架高度,,,80,mm,钢筋桁架节点间距,,,200,mm

受拉区纵向钢筋的相对粘结特性系数,,,,1,,,,0.8,

构件受力特征系数,,,2.1,,相对受压区高度,,,0.518,

2、荷载,,,,,,,,,

,施工阶段：,模板自重+湿混凝土重量,,,2.75,,,,

,,施工荷载,,,1.5,,,,

,使用阶段：,楼板,,,2.75,,,,

,,面层,,,1,,,,

,,吊顶,,,0.5,,,,

,,楼面活荷载,,,5,,准永久系数,,0.5

二、使用阶段计算,,,,,,,,,

1、荷载计算,,,,,,,,,

,楼板净跨,,,,,2800,mm,,

,,,,,,,,,,

,楼板计算跨度,,,,,2850,mm,,

,除楼板自重外的永久荷载,,,(1+0.5)*b=,,0.282,,,

,使用荷载,,5*b=,,,0.94,,,

,除楼板自重外的永久荷载产生的弯矩,,,,,,,,

,,,,,,0.286,,,

,,,,,,,,,,

,使用荷载产生的弯矩,,,,,0.954,,,

,,,,,,,,,,

,楼板自重,,2.75*b=,,,0.517,,,

,,,,,,,,,,

,楼板自重产生的弯矩,,,,,0.525,,,

,,,,,,,,,,

,,,,,,1.241,,,

,,,,,,1.766,,,

,,,,,,2.310,,,

2、截面设计,,,,,,,,,

施工阶段简支且使用阶段也简支时，桁架上弦钢筋只在施工阶段起作用，故使用阶段截面设计时，,,,,,,,,,

应按单筋截面计算下弦受拉钢筋。,,,,,,,,,

,,,,,,,,,,

,,图1,,,,,,,

,如图1所示,,,,90,mm,,,

,混凝土受压区高度,,,,12.313,mm,,,

,,,,,,,,,,

,,,,,,,,,,

,受拉区钢筋截面面积,,,,76.519,mm^2,,,

,,,,,,,,,,

,,,,,,,,,,

,钢筋直径,,,,6.980,,,,

,,,,,,,,,,

,根据钢筋桁架模板表，初选,,,,,,,,

,上弦钢筋直径,,,,10,mm,,,

,下弦钢筋直径,,,,10,mm,,,

,腹杆钢筋直径,,,,4.5,mm,,,

3、配筋率验算,,,,,,,,,

,最大配筋率,,,,0.017,,,,

,最小配筋率取0.2%与中的较大值,,,,,,,,

,,,,,0.159,,,,

,,,最小配筋率=,,0.2%,,,,

,根据选用的模板确定,,,,90,mm,,,

,,,,,33.84,mm^2,,,

,,,,,289.520,mm^2,,,

,,,,,157.080,mm^2,,78.540,mm^2

,,,,,满足要求！,,,,

4、楼板下部钢筋应力控制验算,,,,,,,,,

施工阶段不设临时支撑时，裂缝宽度只与使用阶段增加的面层吊顶重量及使用荷载有关。,,,,,,,,,

,,楼板自重标准值作用下钢筋桁架下弦的拉力,,,,,,,

,,,,,7498.808036,N,,,

,楼板自重标准值作用下钢筋桁架下弦的拉应力,,,,,,,,

,,,,,,47.739,,,

,,,,,,,,,,

,在弯矩作用下楼板下部钢筋的拉应力,,,,,,,,

,,,,,,,,,,

,,,,,,100.876,,,

,,,,,,,,,,

,楼板下部钢筋的拉应力,,,,,148.615,,,

,,,,,,≤0.9fy，满足要求！,,,

5、最大裂缝宽度,,,,,,,,,

,构件受力特征系数,,,2.1,,,,,

,有效受拉混凝土截面面积,,,,,10340,mm^2,,

,纵向受拉钢筋的配筋率,,,,,0.015,,,

,在最大裂缝宽度计算中，当小于0.01时，取0.01,,,,,,,,

,,,,,,0.015191454,,,

,纵向受拉钢筋应力或等效应力,,,,,100.876,Mpa,,

,裂缝间纵向受拉钢筋应变不均匀系数,,,,,,0.345,,

,根据混凝土规范，当时，取0.2；当时，取1,,,,,,,,

,,,,,,0.345003878,,,

,最外层纵向受拉钢筋外边缘至受拉区底边的距离,,,,,,,,

,,当<20时，取20；当>65时，取65，,,,,,20,,

,受拉区纵向钢筋的相对粘结特性系数,,,,1,,,,

,,,,,,,,,,

,受拉区纵向钢筋等效直径,,,,,10,mm,,

,最大裂缝宽度,,,,,0.033,mm,,

又,根据裂缝控制等级查出最大裂缝宽度限值,,,,,0.3,mm,,

,,,,裂缝宽度小于限值，满足要求！,,,,,

6、挠度计算,,,,,,,,,

,纵向受拉钢筋的配筋率,,,,,0.015,,,

,纵向受拉钢筋应力或等效应力,,,,,100.876,Mpa,,

,裂缝间纵向受拉钢筋应变不均匀系数,,,,,,0.345,,

,根据混凝土规范，当时，取0.2；当时，取1,,,,,,,,

,,,,,,0.345003878,,,

,钢筋弹性模量与混凝土弹性模量之比,,,,,7.143,,,

,纵向受拉钢筋配筋率,,,,,0.0093,,,

,,,,,,,,,,

,楼板的短期刚度,,,,,2.56E+11,,,

,,,,,,1.288,,,

,,,,,,1.766,,,

,考虑荷载长期作用下挠度增大系数，按规范取,,,,,,,,

,,纵向受拉钢筋配筋率,,,,0.0046,,,

,,,,,,1.800,,,

,受弯构件的刚度,,,,,1.6154E+11,,,

,楼面活荷载作用下楼板的挠度,,,,,4.999,mm,,

,,挠度限值,,8.143,mm,挠度小于限值，满足要求！,,,

,总挠度,,,,,9.248,mm,,

,,挠度限值,,11.400,mm,挠度小于限值，满足要求！,,,

三、施工阶段验算,,,,,,,,,

因桁架模型手算工作量太大，两位演示设计步骤，施工阶段内力按梁模型计算。结果有一定误差。,,,,,,,,,

1、荷载计算,,,,,,,,,

,施工阶段结构重要性系数,,,0.9,,,,,

,楼板自重,,2.75*b=,,,0.517,,,

,施工荷载,,1.5*b=,,,0.282,,,

,楼板自重产生的弯矩,,,,,,,,

,,,,,,0.525,,,

,施工荷载产生的弯矩,,,,,0.286,,,

,,,,,,0.811,,,

,,,,,,0.928,,,

,剪力,,,,,1.302,,,

2、截面特性计算,,,,,,,,,

,,,,如图2所示，,,,70,mm,

,,,,受压区钢筋截面面积,,,78.540,mm^2,

,,,,受拉区钢筋截面面积,,,157.080,mm^2,

,,,,腹杆钢筋截面面积,,,15.904,mm^2,

,,,,如图2所示，,,,90,mm,

,,,,,,,43.333,mm^2,

,图2,,,,,,,,

,,46.667,mm^2,,,,23.333,mm^2,

,截面有效惯性矩,,,,,,2.58E+05,mm^4,

3、上下弦强度验算,,,,,,,,,

,弦杆轴力,,,,,13252.43893,N,,

,,,,,,,,,,

,上弦钢筋受压应力,,,,,168.735,,,

,,,,,"≤0.9fy',满足要求！",,,,

,下弦钢筋受拉应力,,,,,84.368,,,

,,,,,"≤0.9fy,满足要求！",,,,

,,,,,,,,,,

4、受压弦杆及腹杆稳定性,,,,,,,,,

（1）对受压上弦杆,,,,,,,,,

,受压上弦杆节点间距,,,200,mm,,,,

,上弦杆计算长度,,,,180,mm,,,

,惯性矩,,,,490.874,mm^4,,,

,回转半径,,,,2.5,mm,,,

,长细比,,,72,,"λ<[150],满足要求！",,,

,有λ查得a类截面轴心受压构件稳定系数,,,,,0.683,,,

,上弦杆稳定验算,,,247.050,Mpa,"≤fy',稳定性满足要求！",,,

（2）对腹杆,,,,,,,,,

,,图3,,,,图4,,,

,如图4所示：,,,,,,,,

,,,,,100.405,mm,,,

,,,,,130.405,mm,,,

,,,,,79.267,mm,,,

,如图3所示：,,,,,,,,

,,,,,164.334,mm,,,

,,,,,99.891,mm,,,

,腹杆节点间距,,,,99.891,mm,,,

,腹杆计算长度,,,,69.924,mm,,,

,回转半径,,,,1.125,mm,,,

,长细比,,,62.154,,"λ<[150],满足要求！",,,

,有λ查得a类截面轴心受