风荷载计算 (1)

本工程位于所以按照类地区50年一遇的风压计算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现计算27.9m高的风荷载标准值地面粗糙度可分为A、B、C、D四类;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/m2Awk=βgzμsμzw0=1.615(KN/m2)B式中Cwk风荷载标准值(KN/m2)Dβgz=1.850阵风系数，按GB-50009-2001规定采用3μs=1.2风荷载体型系数，一般墙面区取1.2,墙角区取2.0Cμz=0.970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1.621.00(KN/m2)1.615(KN/m2)由上述计算可知，wk=所以风荷载标准值wk=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A地面粗糙度可分为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风压高度变化系数μz离地面高度ABCD≥4503.123.123.123.12A类=1.379xEXP(0.24xLN(Z/10))4003.123.123.122.911.7643503.123.122.942.683003.122.972.752.45B类=EXP(0.32xLN(Z/10))2502.992.802.542.191.3892002.832.612.301.921502.642.382.031.61C类=0.616xEXP(0.44xLN(Z/10))1002.402.091.701.270.967902.342.021.621.19802.271.951.541.11D类=0.318xEXP(0.60xLN(Z/10))702.201.861.451.020.620602.121.771.350.93502.031.671.250.84401.921.561.130.73301.801.421.000.62201.631.250.840.62151.521.140.740.62101.381.000.740.6251.171.000.740.62城市名基本风压北京0.45天津0.5上海0.55重庆0.4地面粗糙度类别离地面或海平面高度(m)石家庄0.35邢台0.3张家口0.55承德0.4秦皇岛0.45唐山0.4保定0.4沧州0.4大同0.55太原0.4阳泉0.4临沂0.4包头0.55呼和浩特0.55通辽0.55阜阳0.6朝阳0.55锦州0.6鞍山0.5沈阳0.55本溪0.45营口0.6丹东0.55大连0.65四平0.55长春0.65吉林0.5通化0.5齐齐哈尔0.45鹤岗0.4绥化0.55佳木斯0.65哈尔滨0.55牡丹江0.5德州0.45烟台0.55威海0.65济南0.45泰安0.4潍坊0.4青岛0.6兖州0.4莱阳0.4徐洲0.35淮阴0.4南京0.4南通0.45常州0.4杭州0.45舟山0.85金华0.35衢州0.35宁波0.5温州0.6蚌埠0.35六安0.35合肥0.35安庆0.4黄山0.35赣州0.3九江0.35景德镇0.35南昌0.45樟树0.3邵武0.3南平0.35福州0.7龙岩0.35厦门0.8延安0.35宝鸡0.35西安0.35汉中0.3安康0.45酒泉0.55张掖0.5兰州0.3平凉0.3天水0.35银川0.65格尔木0.4西宁0.35玉树0.3伊宁0.6乌鲁木齐0.6库尔勒0.45哈密0.7安阳0.45新乡0.45三门峡0.4洛阳0.4郑州0.45许昌0.4开封0.45南阳0.35驻马店0.4商丘0.35枣阳0.4施恩0.3宜昌0.3天门0.3武汉0.35黄石0.35岳阳0.4吉首0.3常德0.4衡阳0.4郴州0.3长沙0.35韶关0.35梅县0.3广州0.5汕头0.8深圳0.75湛江0.8桂林0.3柳州0.3梧州0.3南宁0.35北海0.7海口0.75三亚0.85绵阳0.3成都0.3内江0.4涪陵0.3遵义0.3贵阳0.3大理0.65昆明0.3丽江0.361阵风系数βgz脉动系数μf27.9m离地面高度27.9m=1.379xEXP(0.24xLN(Z/10))A类=0.92x(1+2μf)μf=0.387xEXP(-0.12xLN(Z/10))1.550μf=0.3422=EXP(0.32xLN(Z/10))B类=0.89x(1+2μf)μf=0.5xEXP(-0.16xLN(Z/10))1.645μf=0.4243=0.616xEXP(0.44xLN(Z/10))C类=0.85x(1+2μf)μf=0.734xEXP(-0.22xLN(Z/10))1.846μf=0.5857=0.318xEXP(0.60xLN(Z/10))D类=0.80x(1+2μf)μf=1.2248xEXP(-0.3xLN(Z/10))2.240μf=0.9003表7.5.1.阵风系数βgzABCD0.387xEXP(-0.12xLN(Z/10))51.691.882.303.21101.631.782.102.76151.601.721.992.540.5xEXP(-0.16xLN(Z/10))201.581.691.922.39301.541.641.832.21401.521.601.772.090.734xEXP(-0.22xLN(Z/10))501.511.581.732.01601.491.561.691.94701.481.541.661.891.2248xEXP(-0.3xLN(Z/10))801.471.531.641.85901.471.521.621.811001.461.511.601.781501.431.471.541.672001.421.441.501.602501.401.421.461.553001.391.411.441.51地面粗糙度类别离地面或海平面高度(m)