湍流强度对基底作用力的影响..docx

湍流强度对风振系数中各参数影响1.风振系数参数分析12荷载规范中给出了高耸结构第一阶阵型为在风振系数表达式子中后面一项表示脉动风作用，只和结构的自身特性（基本风压，阻尼比，自振周期）有关，而是空间位置关系，和脉动风特性相关的量。现在讨论湍流强度的提高对风振系数的影响。12荷载规范中，在B类地区湍流强度为06荷载规范中，在B类地区湍流强度为B类地区风压系数都取2.湍流强度改变对背景分量的影响12荷载规范上给出的计算写成离散形式为在三百米高度范围内，每10米一段，分别求和，其结果见表1表格 1 湍流强度的影响高度高度101.228071.2670521601.2625961.267052201.2366121.2670521701.2633621.267052301.2416361.2670521801.2640841.267052401.2452131.2670521901.2647681.267052501.2479951.2670522001.2654161.267052601.2502731.2670522101.2660341.267052701.2522011.2670522201.2666231.267052801.2538751.2670522301.2671861.267052901.2553521.2670522401.2677261.2670521001.2566761.2670522501.2682431.2670521101.2578741.2670522601.2687411.2670521201.2589691.2670522701.269221.2670521301.2599771.2670522801.2696811.2670521401.2609111.2670522901.2701271.2670521501.2617811.2670523001.2705581.267052图 1 湍流强度比值和风振系数变化值比值（300m高度）同上述计算方法，分别计算200m和100m高度的建筑，湍流强度的比值如下图 2 湍流强度比值和风振系数变化值比值（200m高度）图 3 湍流强度比值和风振系数变化项比值（100m高度）3.基地反力和弯矩分析某一烟囱高250m，受风宽度18m，第一频率为0.159，阻尼比为0.05，基本风压为，用新版规范计算在湍流强度变化的情况下，风振系数和基底反力的对比。解：计算得出表格 2风振系数对比高度高度101.910.0037511.007164101.910.0029661.005665201.910.0117011.022349201.910.0092521.017671301.910.0225061.042986301.910.0177961910.0355111.067826401.910.0280791.053631501.910.0502661.096008501.910.0397451.075913601.910.0664251.126872601.910.0525221.100317701.910.083711.159886701.910.066191.126423801.910.1018881.194606801.910.0805631.153875901.910.1207631.230657901.910.0954881.1823821001.910.1401641.2677131001.910.1108281.2116811101.910.1599431.3054911101.910.1264681.2415541201.910.1799751.3437521201.910.1423071.2718061301.910.2001481.3822831301.910.1582571.3022711401.910.2203661.4208991401.910.1742441.3328061501.910.2405461.4594431501.910.1902011.3632841601.910.260621.4977841601.910.2060731.3935991701.910.2805271.5358071701.910.2218131.4236631801.910.3002191.5734181801.910.2373841.4534031901.910.3196581.6105471901.910.2527541.482762001.910.3388121.6471312001.910.26791.5116892101.910.3576621.6831342101.910.2828041.5401562201.910.37619