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3次梁计算3.1次梁选取本次计算选取B板和C板间次梁进行计算,梁两端支座按固定支座进行计算,不考虑连续梁的荷载不利组合,按照弹性理论方法进行计算。5004500/12375h,梁宽200bmm。3.2材料选用混凝土:采用C30(2214.3/,1.43/ctfNmmfNmm)。钢筋:采用HPB335(2300/yfNmm)。3.3荷载组合系数永久荷载的分项系数:1.20G可变荷载的分项系数:1.40G3.4荷载统计恒荷载设计值:由板传来:2322323.33.33.34.5kN/m1224.54.54.24.24.24.5kN/m125.84/24.54.5mmkNm次梁自重325/0.2(0.50.1)2.0/KNmmmmKNm梁上墙重30.2(3.00.5)20/4.3/mmmkNmKNm两侧抹灰3217/0.02(3.00.10)1.972/KNmmmmKNm合计19.814/KNm活荷载设计值:由板传来:2322323.33.33.32kN/m1224.54.54.24.24.22kN/m122.51/24.54.5mmkNm荷载设计值1.21.427.291/gqKNm3.5内力计算跨内弯矩127.291/4.54.523.02724KNmmmKNm支座弯矩127.291/4.54.546.05412KNmmmKNm支座剪力127.291/4.561.4052KNmmKN3.6配筋计算按弹性理论进行计算,次梁采用C30混凝土,钢筋采用HRB335,查表得:2300/yfNmm,0.550b,214.3/cfNmm,min0.215%,21.43/tfNmm。设置一排受拉钢筋:050035465hmm楼板与梁整体浇筑,故按T型截面进行计算fb与梁的跨度的确定:翼缘与厚度fh有关,《规范》规定T形梁截面受弯构件翼缘计算跨度fb取01/3,,12'nflbsbh三者中的最小值。按梁的计算跨度考虑:04500150033flbmm250(4500150150)4400fnbbsmm因0/100/4650.210.1,fhh故12200121001400ffbbhmm取上面三者的最小值,'1400fbmm。判断T形截面类型:10()114.31400100(465100/2)83123.027cffffbhhhkNmMkNm属于第一类截面。钢筋面积的计算:622123.027100.00530114.31400465scfMfbh1121120.00530.00530.550sb,满足。0.5(112)0.5(1120.0053)0.998ss62023.027101363000.998465sysMAmmfhmin/()136/(200500)100%0.136%0.215%sAbh选用214,2308sAmm斜截面计算:max61.405VkN0465100365wfhhhmm/365/2001.8254whb,属于一般梁。0max0.250.25114.3200465332.4861.405ccfbhkNVkN截面尺寸满足要求。00.70.71.01.4320046593.1max61.405htfbhkNVkN按构造要求:选配6@150(228.3svAmm)验算最小配筋率:min/()228.3/(200150)100%0.189%0.24/0.241.433000.114%svsvtyvAbsff满足要求。
本文标题:次梁计算
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