风荷载标准值计算.doc

2.6风荷载标准值计算作用在屋面梁和楼面梁节点处的集中风荷载标准值：为了简化计算起见，通常将计算单元范围内外墙面的分布风荷载，化为等量的作用于楼面集中风荷载，计算公式如下：式中:基本风压；结构基本周期，取考虑风振影响。作用在屋面梁和楼面梁节点处的集中风荷载标准值为：w=βz·μs·μz·ωo，对于矩形平面μs＝1.3；μz可査荷载规范底层柱高取h=4.3+0.45=4.75m。计算过程如下表中所示Wk=zsz.。T12=0.5×0.32=0.045,由于地面粗糙度为C类，T12应乘以0.62，得0.0279查表ξ=1.15；H/B=16.45/82.5=0.20查表V=0.40。（1）各楼层位置处的值计算结果=1+ξVZ/H表2.6-1楼层号离地高度z(m)相对高度z/hξvμzβzi14.750.291.150.450.741.20280428.650.531.150.450.741.370642312.550.761.150.450.741.531486416.4511.150.450.751.69（2）各楼层位置处的风荷载标准值Fi=Aiμsωo表2.6-2楼层号离地高度z(m)μzβziμsiw0(kN/㎡)hihjAiF/(kN)416.450.751.691.30.53.90160.875132.5409312.550.741.531.30.53.93.9321.75236.785528.650.741.371.30.53.93.9321.75212.023614.750.741.21.30.54.753.9356.8125205.9522水平风荷载作用下框架内力分析1）柱端弯矩如图2.6-2图2.6-2柱端弯矩计算图2）梁端弯矩：根据结点平衡求出对于边柱如图2.6-33）对于中柱如图：2.4-3按两端线刚度分配图2.6-3梁端弯矩计算4)水平荷载引起的梁端剪力、柱轴力如图2.6-4所示：梁端剪力：柱轴力：边柱中柱图2.6-4梁端剪力计算1/1轴框架各柱的杆端弯矩、梁端弯矩计算过程见下表2.6-3表2.6-4表2.6-3A、D柱剪力和柱端弯矩计算层号Vi(kN)ΣDDimDim/ΣDVimyyhMc上Mc下4132.54450700.006300.000.0141.850.351.374.702.533369.33450700.006300.000.0145.160.401.5612.088.052581.35450700.006300.000.0148.130.451.7617.4314.261787.30297900.004600.000.01512.160.593.1126.0137.82B、C柱剪力和柱端弯矩计算层号Vi(kN)ΣDDimDim/ΣDVimyyhMc上Mc下4132.54450700.0010000.000.0222.940.391.546.954.523369.33450700.0010000.000.0228.190.451.7617.5814.382581.35450700.0010000.000.02212.900.491.9325.6624.851787.30297900.005800.000.01915.330.552.8936.2144.30表2.6-4梁端弯矩剪力MAB/MDCMBA/MCDMBC/MCBVAB/VCDVBC4.73.263.691.153.5114.6110.3711.733.6211.1725.4818.7921.256.4220.2340.2728.6632.409.9930.86横向水平风荷载作用下1/1轴的弯矩、剪力和轴力图如图2.4-5~图2.4-7所示。图2.6-5横向水平风荷载作用下1/1轴的M图（单位：kN·m）图2.6-6横向水平风荷载作用下1/1轴的V图（单位：kN）图2.6-7横向水平风荷载作用下1/1轴的N图（单位：kN）