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目录1工程概况........................................................12板的计算........................................................22.1确定板厚h和梁截面...................................................22.2荷载计算.............................................................22.3板的承载力计算.......................................................22.4板的配筋.............................................................53支承梁的计算....................................................63.1长边支承梁中梁计算...................................................73.2长边支承梁边梁计算..................................................123.3短边支承梁中梁计算..................................................163.4短边支承梁边梁计算..................................................214板的验算.......................................................254.1荷载计算............................................................254.2弯矩计算............................................................254.3挠度变形验算........................................................275支承梁的验算...................................................285.1长边方向支承梁中梁的验算............................................285.2短边方向梁支承梁的验算..............................................30致谢.............................................................33参考文献.........................................................341工程概况根据初步设计成果,提出设计资料及数据如下:1、墙体厚度370mm,结构横向长mL91,结构纵向长mL72。楼梯位于该层面的外部,本设计不予考虑。楼盖采用整体式双向板肋形结构,两邻边采用支撑在墙上,另两邻边支撑在梁上;2、该建筑位于非地震区;3、建筑物安全级别为二级;4、结构环境类别一类;5、建筑材料等级:混凝土强度等级:C40;钢筋:板中分布钢筋,梁中箍筋及构造钢筋采用HPB300,板中受力钢筋采用HRB335级,梁中受力钢筋采用HRB400级;6、荷载:钢筋混凝土重力密度为325mkN,楼面面层为水磨石(25mm厚水泥砂浆,自重为320mkN);梁板天花为混合砂浆抹灰(15mm,重力密度为317mkN),楼面活荷载标准值37.3mkN;7、结构平面布置及初估尺寸:板在墙上的支承长度为120mm;两边梁在墙上的支承长度均为240mm。柱子计算高度为4m,尺寸mmmmhb400400;(如图1)8、使用要求:梁、板允许挠度、最大裂缝宽度允许值见规范;9、采用的规范:混凝土结构设计规范(GB50010-2010),建筑结构荷载规范(GB5009—2001)。图1梁板结构平面布置由图1可知,支承梁横向布置,跨度为9000mm,支承梁纵向布置,跨度为7000mm。22板的计算2.1确定板厚h和梁截面计算构件板的厚度mmmmmmllhoxox160,175140501401取(oxl为双向板的短向计算跨度,mmlox7000)。长边梁截面尺寸mmmmmmlhb800,112550018181取(l为横向梁间的间距,即mml9000),mmmmmmhbbb240,4002004121取。短边梁截面尺寸mmmmmmlhb500,87538918181取(l为纵向梁间的间距,即mml7000),mmmmmmhbbb240,3001504121取。2.2荷载计算25mm厚水泥砂浆25.020025.0mkN板自重2425160.0mkN15mm混合砂浆抹灰226.017015.0mkN恒载标准值276.4mkN恒载设计值243.635.176.4mkNg载设计值263.37.04.17.3mkNq合计206.10mkNqgp2.3板的承载力计算在求各区格板跨内正弯矩时按恒荷载均布及活荷载棋盘式布置计算,取荷载:2'25.8263.343.62mkNqgg,2'81.1263.32mkNqq在'g作用下各内支座均可视作固定,某些区格板跨内最大正弯矩不在板的中心点处,在'q作用下,各区格板四边均可视作简支,跨内最大正弯矩则在中心点处,计算时,可近似3取二者之和作为跨内最大正弯矩值。在求各中间支座最大负弯矩(绝对值)时,按恒荷载及活荷载均满布各区格板计算,取荷载:206.10mkNqgp按《混凝土结构设计》(第三版)沈蒲生主编附录8进行内力计算,计算简图及计算表格间表2.角区格板A计算跨度:mlnx76.6224.012.07,mballnxox94.6224.0212.076.622mlny76.8224.012.09,mballnyoy94.8224.0212.076.822(a是梁、板在墙上的支承长度,b是梁、板的中间支座宽度,h是板的厚度,nl是梁、板的净跨度)边区格板E计算跨度:mlnx76.6224.012.07,mballnxox94.6224.0212.076.622mllcoy9边区格板G计算跨度:mllcox7mlny76.8224.012.09,mloy94.8224.0212.076.8中间区格板I计算跨度:mllcox7,mllcoy9表1双向板弯矩计算区格AE跨内oyoxll78.094.894.677.0994.6计算简图0xmmmkN80.1994.681.10585.025.80370.02mmkN51.1794.681.10596.025.80310.02ymmmkN72.1094.681.10327.025.80198.02mmkN33.1194.681.10324.025.80214.0242.0xmmmkN94.2172.102.080.19mmKN78.1933.112.051.17ymmmkN68.1480.192.072.10mmkN83.1451.172.033.11支座计算简图'xmmmkN85.4394.606.100905.02mmkN30.3994.606.100811.02'ymmmkN48.3694.606.100753.02mmkN89.3494.606.100720.02区格GI跨内oyoxll78.094.8778.097计算简图0xmmmkN04.18781.10585.025.80318.02mmkN55.16781.10585.025.80281.02ymmmkN67.7781.10327.025.80118.02mmkN48.8781.10327.025.80138.022.0xmmmkN57.1967.72.004.18mmkN25.1848.82.055.16ymmmkN28.1104.182.067.7mmkN79.1155.162.048.8支座计算简图'xmmmkN13.36706.100733.02mmkN47.33706.100679.02'ymmmkN15.28706.100571.02mmkN65.27706.100561.02支座处的弯矩:A—G支座:mmkNmx99.3913.3685.4321'5A—E支座:mmkNmy69.3589.3448.3621'G—I支座:mmkNmy90.2765.2715.2821'G—I支座:mmkNmx39.3647.3330.3921'2.4板的配筋mmhhox14020,mmhhoy13030(跨内及支座截面),内力臂系数95.0,95.090.0ss取,板内受力钢筋采用HRB335,2300mmNfy,095.0hfMAys表2板的跨中配筋截面mkNMmmh02mmAs选配钢筋实配面积2mm跨中A区格oxl方向19.80140496180@1210532oyl方向10.72130289200@10393E区格oxl方向17.51140439200@1210479oyl方向11.33130306200@10393G区格oxl方向18.04140452180@1210532oyl方向7.67130207200@10393I区格oxl方向16.55140332200@10393oyl方向8.48130183200@10393注:2minmin3201000160%2.0mmbhAs(取1m板计算)6表3板的支座配筋截面mkNMmmh02mmAs选配钢筋实配面积2mm支座A-G39.991401002300@8150@141026=1194168A-E35.69140894300@8160@14962=1130168G-I27.90140699300@8180@1412742=910168E-I36.39140912300@8160@14962=11301683支承梁的计算长边方向梁的尺寸取mmmmhb800240,短边方向梁的尺寸取mmmmhb500240。双向板传给支承梁的荷载分布:双向板长边支承梁上荷载呈梯形分布,短边支承梁上荷载呈三角形分布,支承梁结构自重及抹灰荷载为均匀分布,如图2所示:7图2双向板支承梁计算简图3.1长边支承梁中梁计算(1)荷载计算梁自重mkN61.416.08.024.0252.1梁测抹灰mkN39.016.08.0015.0172.12梁传来的均布荷载mkNg539.061.41板传来的恒载(梯形荷载)mkNg01.45743.6传来的活荷载(梯形荷载)mkNq41.25763.3(2)计算跨度两端部搁置在墙上,支撑长度为mm240,柱的截面尺寸mmmm400400边跨:mln56.82.024.09mblmballnn97.82025.188.824.0224.056.8220
本文标题:弹性混凝土楼盖板设计
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