楼梯配筋计算§1楼梯设计该楼梯为现浇整体板式楼梯,楼梯踏步尺寸150mm×280mm,楼梯采用C30混凝土2/3.14mmNfc,板和梁纵筋采用HRB335钢筋2/300mmNfy,楼梯活荷载标准值为2.5kN/㎡,平面图如下:图1楼梯平面图§2踏步板计算§2.1荷载计算取1米板宽带进行计算,踏步尺寸150mm×280mm,斜板的厚度取t=40mm,则截面的平均角度:88.0280150280cos22mmmmmm截面平均高度:mmh12088.0402150恒荷载:踏步板自重:mkNmkNmm/08.1/253.012.02.13踏步面层重:mkNmkNmm/34.0/65.015.028.02.12踏步抹灰重mkNmkNmm/19.0/1703.0318.02.13g=1.61kN/m使用活荷载q=1.4×2.5kN/㎡×0.28=0.98kN/m总计:g+q=2.59kN/m§2.2内力计算斜梁截面尺寸选用b×h=150mm×300,则踏步板计算跨度为:mmmmmmblln150015013500踏步板跨中弯矩:mkNlqgM73.05.159.28181220§2.3截面承载力计算踏步板计算截面尺寸:mmmmhb120300mmahh1002012002min2221022260172120300002.043.2/210/43.10.1100300017.0017.0211017.0/3.141003000.11073.0mmmmmmbhmmmmNmmNmmmmffbhAammNmmmmmmNfbhMaycsscs所以踏步板按构造配筋,每踏步采用28(2101sAmm),取踏步内斜板分布钢筋8@300mm。§3楼梯斜梁计算§3.1截面荷载计算踏步板传荷载:mkNmmmmkN/12.63.0115.0235.1/59.221斜梁自重:mkNmkNmmm/13.1894.01/2515.004.028.02.13斜梁抹灰:mkNmkNmmm/22.088.01/1702.004.028.02.123总计:7.74kN/m§3.2内力计算取平台梁截面尺寸:b×h=200㎜×400㎜,斜梁水平方向计算跨度为:mmmblln28.320.008.30,取斜梁跨中截面弯矩及支座截面剪力为:kNmmkNlqgVmkNmmkNlqgMn17.1188.028.3/74.721cos2141.1028.3/74.781812220§3.3承载力计算斜梁按T型梁截面进行配筋,取:030035265shhammmmmm,翼缘有效宽度`fb按倒L型截面计算;按梁的跨度考虑:mmmmlbf5476/32806/'按翼缘宽度考虑:mmmmmmsbbf8252/13501502/0'按翼缘高度考虑:10.0151.0265/40/0'mmmmhhf;取mmbf547';首先:按第一类T型截面进行试算:15.026540019.0025.0211211019.0/3.142655470.11041.100'22610mmmmhhmmNmmmmmmNfbhMfscs结构确定为第一种T型截面,故22min22210'90300150102.028.131/300/3.140.1265547019.0mmmmmmbhmmmmNmmNmmmmffhbAycfs故选用212(2226sAmm)kNkNNmmNmmmmfbht03.1379.391079.39/43.12651507.07.0320故按照构造配置箍筋,选用双肢箍,8@200。mmss200max§4休息平台§4.1荷载计算平台板厚120m,做30厚水磨石面层,20厚混合砂浆抹灰)恒载:平台板自重:23/0.3/25120.0mkNmkNm平台板面层重:2/65.0mkN平台板抹灰:23/34.002.0/17mkNmmkN恒载合计:2222/79.4/34.0/65.0/32.1mkNmkNmkNmkN活载合计:22/5.3/5.24.1mkNmkN总计:222/29.8/5.3/79.4mkNmkNmkNqg§7.4.2内力计算休息平台按双向板设计:(按塑性理论计算);mlx6.1mmmly4.32.06.3313.26.1/4.3/mmllnxy,按双向板设计,则2213.2/1/122.0n2则:xxyxmmlM4.3xxxxyxymmmlmlM35.06.122.0xxxxyyxxxyxxmmmlMMmmmlMM7.06.122.028.64.32''''代入基本公式:``````2221/12(3)xyxxyyxyxMMMMMMPLLLmmkNmmmmmkNmmmmmkNmmmmkNmmmmmyyyxxxxyxxxxx/3.015.02/36.168.02/15.067.022.0/68.06.14.336.129.812/17.0280.6235.024.32''2§4.3配筋计算由各区格跨内支座弯矩求得:取截面有效高度mmhx1000,mmhy900,即可求得0/0.95syAMfh。跨中:Lx方向:mmmmmNmmmmNfhmAyxxs/86.23/30010095.0/1068.095.022260Ly方向:mmmmmNmmmmNfhmAyyys/85.5/3009095.0/1015.095.022260支座:Lx方向:mmmmmNmmmmNfhmAyxxs/72.47/30010095.0/1036.195.022260'Ly方向:mmmmmNmmmmNfhmAyyys/7.11/3009095.0/103.095.022260'表1楼梯平台板配筋截面方向M(KN·M)选配钢筋实配钢筋跨中Lx方向0.6823.86100φ8@200251mm²/mLy方向0.155.8590φ8@200251mm²/m支座Lx方向1.3647.72100φ8@200251mm²/mLy方向0.311.790φ8@200251mm²/m2sA/mm0/hmm