风荷载计算

B类地区50年一遇的风压计算6.0

m高的风荷载标准值对于平坦或稍有起伏的地地面粗糙度可分为A、B、

玻璃幕墙的风荷载标准值应按下式计算，并且不应小于1.00KN/m2

wk=βgzμsμzw0=1.674(KN/m2)

式中wk风荷载标准值(KN/m2)

βgz=1.860阵风系数，按GB-50009-2001规定采用

μs=1.2风荷载体型系数，一般墙面区取1.2,墙角区取2.0μz=1.000

风压高度变化系数，按GB-50009-2001规定采用

w0=

0.75基本风压(KN/m2),按GB-50009-2001规定采用

由上述计算可知，wk=1.67>

1.00(KN/m2)所以风荷载标准值wk=1.674(KN/m2)

ABCD2B

对于平坦或稍有起伏的地形，风压高度变化系数应根据地面粗糙类别按下表采用

糙度可分为A、B、C、D四类;

指近海海面和海岛、海岸、湖岸及沙漠地区

指田野、乡村、丛林、丘陵以及房屋比较稀疏的乡镇和城市郊区A

指有密集建筑群的城市市区

指有密集建筑群且房屋较高的城市市区

表7.2.1 风压高度变化系数μz离地面或海地面粗糙度类别平面高度(m)ABCD≥4503.123.123.123.124003.123.123.122.913503.123.122.942.683003.122.972.752.452502.992.802.542.192002.832.612.301.921502.642.382.031.611002.402.091.701.27902.342.021.621.19802.271.951.541.11702.201.861.451.02602.121.771.350.93502.031.671.250.84401.921.561.130.73301.801.421.000.62201.631.250.840.62151.521.140.740.62101.381.000.740.6251.171.000.740.62基本风压城市名北京0.45天津0.5上海0.55重庆0.4风压高度变化系数μz

离地面高度A类=1.379xEXP(0.24xLN(Z/11.220B类=EXP(0.32xLN(Z/10))1.000C类=0.616xEXP(0.44xLN(Z/10.740D类=0.318xEXP(0.60xLN(Z/10.620石家庄邢台张家口承德秦皇岛唐山保定沧州大同太原阳泉临沂包头呼和浩特通辽阜阳朝阳锦州鞍山沈阳本溪营口丹东大连四平长春吉林通化齐齐哈尔鹤岗绥化佳木斯哈尔滨牡丹江德州烟台威海0.350.30.550.40.450.40.40.40.550.40.40.40.550.550.550.60.550.60.50.550.450.60.550.650.550.650.50.50.450.40.550.650.550.50.450.550.65济南泰安潍坊青岛兖州莱阳徐洲淮阴南京南通常州杭州舟山金华衢州宁波温州蚌埠六安合肥安庆黄山赣州九江景德镇南昌樟树邵武南平福州龙岩厦门延安宝鸡西安汉中安康0.450.40.40.60.40.40.350.40.40.450.40.450.850.350.350.50.60.350.350.350.40.350.30.350.350.450.30.30.350.70.350.80.350.350.350.30.45酒泉张掖兰州平凉天水银川格尔木西宁玉树伊宁乌鲁木齐库尔勒哈密安阳新乡三门峡洛阳郑州许昌开封南阳驻马店商丘枣阳施恩宜昌天门武汉黄石岳阳吉首常德衡阳郴州长沙韶关梅县0.550.50.30.30.350.650.40.350.30.60.60.450.70.450.450.40.40.450.40.450.350.40.350.40.30.30.30.350.350.40.30.40.40.30.350.350.3广州汕头深圳湛江桂林柳州梧州南宁北海海口三亚绵阳成都内江涪陵遵义贵阳大理昆明丽江1180.50.80.750.80.30.30.30.350.70.750.850.30.30.40.30.30.30.650.30.3阵风系数βgz

6.0mA类离地面高度=0.92x(1+2μf)1.677=EXP(0.32xLN(Z/10))B类=0.89x(1+2μf)1.856=0.616xEXP(0.44xLN(Z/10))C类=0.85x(1+2μf)2.246=0.318xEXP(0.60xLN(Z/10))D类=0.80x(1+2μf)3.0846.0m脉动系数μf

=1.379xEXP(0.24xLN(Z/10))μf=0.387xEXP(μf=0.4115μf=0.5xEXP(-0.μf=0.5426μf=0.734xEXP(μf=0.8213μf=1.2248xEXPμf=1.4276表7.5.1.阵风系数βgz地面粗糙度类别离地面或海平面高度(m)ABC0.387xEXP(-0.12xLN(Z/10))510150.5xEXP(-0.16xLN(Z/10))2030400.734xEXP(-0.22xLN(Z/10))5060701.2248xEXP(-0.3xLN(Z/10))80901001502002503001.691.631.601.581.541.521.511.491.481.471.471.461.431.421.401.391.881.781.721.691.641.601.581.561.541.531.521.511.471.441.421.412.302.101.991.921.831.771.731.691.661.641.621.601.541.501.461.44D3.212.762.542.392.212.092.011.941.891.851.811.781.671.601.551.51