内力计算.doc
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1、 4 内力计算1) 梁、柱参数汇总:根据2.2截面参数计算,现将第轴横向框架梁、柱相关参数作一汇总:其中:第轴横向框架为中框架,考虑板对内力计算的影响(“T”型截面),对梁的惯性矩进行折算,折算惯性矩。线刚度按下式计算: (4.1)表3.4 第轴框架梁几何参数断面hb(mm2)跨度(mm)矩形截面惯性矩(mm4)折算惯性矩(mm4)线刚度i(Nmm)40030027001.60E+093.20E+093.32E+1060030063255.40E+0910.80E+094.78E+10同理,列表计算柱相关参数如下:表3.5 第轴框架柱参数类型层次断面hb(mm2)层高(mm)截面惯性矩(mm4
2、)线刚度i(Nm)KD值边柱850050042005.21E+093.47E+71.3790.4081.084E+04750050042005.21E+093.47E+71.3790.408 1.084E+04650050042005.21E+093.47E+71.3790.4081.084E+04550050042005.21E+093.47E+71.3790.4081.084E+04450050042005.21E+093.47E+71.3790.4081.084E+04350050042005.21E+093.47E+71.3790.4081.084E+04250050042005.21
3、E+093.47E+71.3790.4081.084E+04150050055505.21E+092.63E+71.8190.607 0.800E+04中柱850050042005.21E+093.47E+70.960/2.3390.324/0.5390.861E+04750050042005.21E+093.47E+72.3390.5391.432E+04650050042005.21E+093.47E+72.3390.5391.432E+04550050042005.21E+093.47E+72.3390.5391.432E+04450050042005.21E+093.47E+72.33
4、90.5391.432E+04350050042005.21E+093.47E+72.3390.7051.432E+04250050042005.21E+093.47E+72.3390.463 1.432E+04150050055505.21E+092.63E+73.085 0.597 0.0.938E+04表3.6 第轴框架各层D值汇总8层7层6层5层4层3层2层1层B轴边柱/1.084E+041.084E+041.084E+041.084E+041.084E+041.084E+040.800E+04C轴中柱0.861E+041.432E+041.432E+041.432E+041.432E
5、+041.432E+041.432E+040.0.938E+04D轴中柱1.432E+041.432E+041.432E+041.432E+041.432E+041.432E+041.432E+040.0.938E+04F轴边柱1.084E+041.084E+041.084E+041.084E+041.084E+041.084E+041.084E+040.800E+04本层D值3.377E+045.033E+045.033E+045.033E+045.033E+045.033E+045.033E+043.727E+04根据高规4.4.4“抗震设计的高层建筑结构,其楼层侧向刚度不宜小于相邻上部楼
6、层侧向刚度的70%或其上相邻三层侧向刚度平均值的80%”。验算如下: (满足)根据抗震规范5.5.1“钢筋混凝土框架结构应进行多遇地震作用下的抗震变形验算,其楼层内最大弹性层间位移应符合下式要求: (4.2)验算如下:地震作用变形验算层次层间刚度Di(KN/M)地震层间剪力(KN)层间位移 (M)层高(m)层间相对转角层间相对转角限值1.818E-03833772680.0024.24.794E-04满足75032668.260.00144.23.229E-04满足65032697.40.00194.24.608E-04满足550326121.690.00244.25.757E-04满足450
7、326141.120.00284.26.676E-04满足350326155.690.00314.27.366E-04满足250326167.020.00334.27.902E-04满足130269173.50.00575.551.033E-03满足2) 弯矩计算: 利用力矩二次分配法计算恒载作用下框架的弯矩。(1)计算杆固端弯矩: 将梯形或三角形分布荷载按固端弯矩等效的原则折算成均布荷载: 梯形荷载折算公式: (4.3) 其中: ; (4.4) 为梯形分布荷载的最大值。 三角形荷载折算公式: (4.5) 其中: 为三角形分布荷载的最大值。BC跨CD跨DF跨层次均布梯形等效均布三角形等效均布梯
8、形等效8/3.1912.9811.304.8322.7223.3774.8322.7223.373.1910.349.654.8318.1019.60164.8318.1019.603.1910.349.654.8318.1019.60现以8层DF和DC跨为例进行计算: a、顶层边跨(DF): b、顶层中跨(DC): 其余的计算方法同上。由以上所求均布荷载,可按下式求各杆固端弯矩:两段固支:其中与意义见下图4.1:图3.17 固端弯矩示意图8层: 7层:16层: 杆端弯矩以顺时针为正,逆时针为负。(2)分配系数: 分配系数计算公式: (4.6) 其中:为转动刚度,两端固支杆 ,n为该节点所连接
9、的杆件数。计算跨中弯矩时,应按分布荷载计算,然后叠加杆端弯矩在跨中的1/2,得到实际跨中弯矩。计算过程采用EXCEL进行,模拟手算弯矩二次分配。活载弯矩计算过程同恒载弯矩计算过程,因此不在赘叙。计算结果见活载弯矩分配表,因不考虑活载最不利布置,所以将跨中弯矩乘以1.2。图3.19 恒载弯矩二次分配计算简图活载弯矩图:图3.20 恒载作用下弯矩图风荷载在柱中产生弯矩剪力计算,采用D值法。计算过程是,利用前面计算的各柱的D值,将各楼层层间剪力进行分配,得到各柱剪力。(2)反弯点高度 (4.7)其中:为标准反弯点高度,其值与结构总层数n,该柱所在层次j、框架梁柱线刚度比及侧向荷载形式有关;表示上下横
10、梁线刚度比对反弯点高度的影响;与表示层高变化对反弯点的影响,以上系数均可查表;利用公式,,这样可以计算出各柱柱上下端弯矩。 风荷载作用下柱端弯矩及剪力层 次 hi层间剪力风载DDiKiyVi风M风上M风下F84.212.351.2710.4081.3790.3883.96 10.19 6.46 74.228.231.8940.4081.3790.456.08 14.05 11.49 64.242.871.8940.4081.3790.4699.23 20.60 18.19 54.255.921.8940.4081.3790.46912.05 26.87 23.73 44.267.81.8940
11、.4081.3790.514.61 30.67 30.67 34.278.211.8940.4081.3790.516.85 35.38 35.38 24.287.381.8940.4081.3790.518.82 39.53 39.53 15.5596.682.6240.6071.8190.60922.36 48.53 75.59 D84.212.351.2710.5392.3390.455.24 12.10 9.90 74.228.231.8940.5392.3390.4678.03 17.98 15.76 64.242.871.8940.5392.3390.512.20 25.62 25
12、.62 54.255.921.8940.5392.3390.515.91 33.42 33.42 44.267.81.8940.5392.3390.519.29 40.52 40.52 34.278.211.8940.5392.3390.522.26 46.74 46.74 24.287.381.8940.5392.3390.524.87 52.22 52.22 15.5596.682.6240.7053.0850.5525.98 64.87 79.29 C84.212.351.2710.3240.960.4953.15 6.68 6.55 74.228.231.8940.5392.3390.
13、4678.03 17.98 15.76 64.242.871.8940.5392.3390.512.20 25.62 25.62 54.255.921.8940.5392.3390.515.91 33.42 33.42 44.267.81.8940.5392.3390.519.29 40.52 40.52 34.278.211.8940.5392.3390.522.26 46.74 46.74 24.287.381.8940.5392.3390.524.87 52.22 52.22 15.5596.682.6240.7053.0850.5525.98 64.87 79.29 B874.228.
14、231.8940.4081.3790.456.08 14.05 11.49 64.242.871.8940.4081.3790.4699.23 20.60 18.19 54.255.921.8940.4081.3790.46912.05 26.87 23.73 44.267.81.8940.4081.3790.514.61 30.67 30.67 34.278.211.8940.4081.3790.516.85 35.38 35.38 24.287.381.8940.4081.3790.518.82 39.53 39.53 15.5596.682.6240.6071.8190.60922.36
15、 48.53 75.59 注:层间刚度D值均采用相对值。地震荷载作用下柱端弯矩及剪力层 次 hi(米)地震荷载DDiKiyVi地震M地震上M地震下F84.2681.2710.4081.3790.38821.83 56.11 35.57 74.268.261.8940.4081.3790.4514.70 33.97 27.79 64.297.41.8940.4081.3790.46920.98 46.79 41.33 54.2121.691.8940.4081.3790.46926.21 58.46 51.64 44.2141.121.8940.4081.3790.530.40 63.84 63
16、.84 34.2155.691.8940.4081.3790.533.54 70.43 70.43 24.2167.021.8940.4081.3790.535.98 75.56 75.56 15.55173.52.6240.6071.8190.60940.14 87.10 135.65 D84.2681.2710.5392.3390.4528.84 66.61 54.50 74.268.261.8940.5392.3390.46719.43 43.49 38.10 64.297.41.8940.5392.3390.527.72 58.21 58.21 54.2121.691.8940.539
17、2.3390.534.63 72.72 72.72 44.2141.121.8940.5392.3390.540.16 84.34 84.34 34.2155.691.8940.5392.3390.544.31 93.04 93.04 24.2167.021.8940.5392.3390.547.53 99.82 99.82 15.55173.52.6240.7053.0850.5546.61 116.42 142.29 C84.2681.2710.3240.960.49517.33 36.77 36.04 74.268.261.8940.5392.3390.46719.43 43.49 38
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