四川大学本科毕业设计圣安卓国际公寓结构设计-132-第四章楼梯结构设计§11号楼梯§1.1结构布置与截面尺寸1、根据楼梯建筑详图作出结构布置图如下页图,考虑到1号楼梯梯段较短和公共楼梯的卫生和美观要求,拟全部采用板式楼梯。2、平台板和踏步板板厚取一致mmlh7.862600301,考虑到砼强度为C30,较高取mmh80,平台梁取200×350mm§1.2平台板设计1、荷载清理楼梯活荷载为2/0.2mKNq平台板恒载:50mm厚面层:20.5251.25/KNm80mm结构层:20.08252.0/KNm200mm抹灰:20.02200.4/KNm23.65/kgKNm取3.72/KNm2、内力计算及截面设计楼梯只考虑恒载和活载的组合,其中荷载分项系数1.2,1.4GQ所以平台板的荷载设计值21.23.71.42.07.24/pKNm取1m板带计算其内力,0802060hmm近似取简支梁内力的80%。砼强度为C30,14.3,235,210cyfMPaHRBfMPa钢筋,各平台板内力计算及截面设计见表1.1表1.11#楼梯平台板内力计算及截面设计表板号0()Lm跨度202110(/)MpLKNm10scMfbh1120.35s10scyAfbhf选配实配PTB11.371.360.02640.0268109.56@120283PTB21.631.920.03730.0381566@120236PTB32.153.350.06510.06742756@100283PTB-42.592.590.05030.05162116@120236四川大学本科毕业设计圣安卓国际公寓结构设计-133-上TB-61350下上1350下2450TL-42.450-4.900层平面图1370PTB116.380-39.580层平面图13701370PTB17.900-10.796层平面图10010020020020808×260=215033502450TL-5TL-61003000135010013501002002002001001350PTB4下上上TB-8TB-8TL-3TL-1245023403350上9×260=TB-6189020020010010013503000200100135010030007×260=1820260上3350TB-4TL-3TB-52150100PTB38×260=2080上下TB-7PTB42008×260=39.580层平面图10020021503350100200100200245020801370TB-64.900-7.900层平面图8×260=TB-710.796-16.380层平面图200100PTB4下TL-730001350100135010020010033502150上1001350100200200PTB110013702001009×260=100300013501001002002001890PTB4h=803350上TL-5TL-330001001350100200PTB4TL-4TB-8TB-8TL-1PTB1200245020801370100PTB1245023401370100200TL-6PTB1上TB-72450-3.900-±0.000层平面图2002001001002001350300010013501002007×260=18202602250上TB-1335011×260=2860TB-11370100上TL-08×260=20806×260=1560±0.000-2.450层平面图10013702001001370PTB1h=80TL-21002005201040上3350163010020010013501630PTB2h=8020020010010013503000100下TL-11370100上TB-3PTB110013702450TB-2TL-2200四川大学本科毕业设计圣安卓国际公寓结构设计-134-其中min45451.43/2100.31%max0.31%0.2%tyff所以2min0.31%100060196sAmm分布筋及有关构造筋按构造要求配置,具体配置见施工图,此处略,以下构件照此处理。§1.2踏步板设计1、踏步板活载为2.0,恒载计算见表1.2表1.21#楼梯梯段板恒载计算表板号踏步尺寸50mm厚砼面层三角形踏步产生恒载80mm结构层产生荷载20mm厚抹灰产生荷载2/)kgKNm(TB-1169.57×2602.072.112.390.487.1TB-2153.13×2601.991.912.360.476.8TB-3153.125×2601.991.91相差不大,故取gk=7.1TB-4153.125×2601.991.91TB5153.125×2601.991.91TB-6150×2601.971.88TB-7155.11×2602.01.94TB-8161.11×2602.022.012、TB恒载统一取7.12/KNm,那么其荷载设计值21.27.11.42.011.32/pKNm内力计算及截面设计各参数同平台板部分。全部踏步板内力计算及截面设计见表1.3。其中TB-2为折板,其跨中最大弯矩计算需要考虑各段荷载(平直部分取平台板荷载),不同的影响,其具体计算过程略。§1.3平台梁设计1、荷载计算由于各平台板荷载相差不大,其传荷给平台梁时按均布荷载考虑各平台梁荷载设计值计算见表1.4四川大学本科毕业设计圣安卓国际公寓结构设计-135-表1.3平台板截面设计板号0()Lm跨度202110(/)MpLKNm10scMfbh1120.35s10scyAfbhf选配TB-12.67.5620.1470.1665410@120TB-22.69.5650.1860.20784610@90TB-32.67.5620.1470.1665410@120TB-42.084.900.0950.104088@120TB-52.084.900.0950.104088@120TB-62.346.200.120.1295278@90TB-72.084.900.0950.104088@120TB-82.084.900.0950.104088@120其中恒载分项系数为1.2,活载分项系数1.4平台梁自重由227/GKNm,有0.2(0.350.08)271.458/gKNm表1.41#楼梯平台梁荷载计算表梁号自重/KNmTB传来平台板传来/kgKNm/kqKNmPTB1TB2平均TL-11.4589.239.239.233.0213.714.2322.4TL-29.239.239.232.5313.223.9721.4TL-37.3847.3847.3843.9812.824.2321.3TL-47.3847.3847.3842.5311.373.9719.2TL-57.8467.8467.8463.5012.814.2321.3TL-67.8467.8467.8462.5311.8343.9719.8TL-77.38403.983.989.134.2316.9四川大学本科毕业设计圣安卓国际公寓结构设计-136-可以看出TL1~TL6荷载相差不大,按同一配筋处理。2、内力计算及截面设计035035315hmm,计算跨度03.1lm。按倒L形截面进行计算,翼缘宽度0516,5006flbmm取2018Mpl2122.43.18=26.91KNm012Vpl122.42.82=31.4KN用HRB335级钢筋,300yfMPa'''1026910.5cfffMKNmfbhhh14.3500803150.580157.3/KNm属于第一类截面6'221026.91100.0379114.3500315scfMfbh1120.0386s'10114.35003150.0386289.8300cfsyfbhAfmaxmax450.2tyff=0.31%min0.31%200315195.3sA选配262402sAmm配置6@200箍筋,则斜截面承载力000.71.25svcstyvAVfbhfhs56.60.71.432003151.2521031520086.46KN由此可以看出平台梁配筋极少,且如按实际荷载计算TL-7所配筋小于最小配筋率要求,故TL-7也按TL-1至TL-6所配筋进行设计。四川大学本科毕业设计圣安卓国际公寓结构设计-137-§22、3、4号楼梯§2.12、3、号楼梯1、这三部楼梯大致相同,仅2.4500—4.900层有区别,详见结构布置简图。考虑到楼板较厚,则全部采用板式楼梯,便于施工和美观。踏步板最大跨度为3920,拟采用板厚120,平台板和踏步板取相同厚度。平台梁用200×3502、①活载23.5/qKNm②恒载:平台板50mm厚砼面层0.05×25=1.252/KNm120mm厚结构层0.12×25=3.02/KNm20mm厚底抹灰0.02×20=0.42/KNm24.654.7/kgKNm取楼梯段取相同荷载,以153.125×280踏步计算:50mm厚面层:(0.15313+0.28)×0.05×25/0.28=1.932/KNm三角形踏步:0.15313×0.28×0.5×25/0.28=1.912/KNm120厚结构层:cos0.8770.12×25/0.877=3.422/KNm20厚底抹灰:0.02×20/0.877=0.4562/KNm7.727.8kg取2/KNm3、截面设计梁纵筋采用HRB400,360yf,板采用HRB335,210yf301.43,1.43ctCff砼,max400,0.518,0.35bHRB板○1平台板总的荷载设计值GkQKPgQ1.21.4GQ其中,分项系数取和21.24.71.43.510.54/PKNm取1000宽带进行计算012020100hmin1.4345450.31%0.2210tyffmin0.31%1000100310sA四川大学本科毕业设计圣安卓国际公寓结构设计-138-16405607×280=1960120016405×280=14002960120018406E4#楼梯-3.900~±0.000层平面图3#楼梯±0.000~2.450层平面图6E300350162539001501502001625E72007TB-6TB-612×280=33602200上7200TL-2TL-6PTB1上1640350300200150150162516253900EF1640168024805×280=14004#楼梯±0.000~2.450层平面图720079×280=25203#楼梯2.450~4.900层平面图TB-7TL-7PTB4上7200TB-7TL-61640上PTB1F4E5×280=140029601640120016402#楼梯±0.000~2.450层平面图E15015016252001625360011PTB2300162516251501501503600200E72002#、3#、4#楼梯4.900~9.400层平面图TB-1TB-2TL-09×280=2529上TL-2TL-1PTB1F3600162520016251501501640上TB-5TB-5TL-5下14×280=3920上7200TL-2TL-5PTB1上1640150150162520016253003600DF1625300215016251503600200TB-1TB-2TL-1TL-0P