矩形截面高层建筑的横风向基底弯矩系数均方根值研究  

Study of the RMS values of across-wind aerodynamic base moment coefficients of high-rise buildings with square or rectangular sections

作　　者：全涌[1] 张正维[1,2] 顾明[1] 熊勇[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]南通大学,江苏南通226019

出　　处：《土木工程学报》2012年第4期63-70,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(50878159;50621062;90715040);上海市浦江人才计划(08PJ1409500);教育部高等学校博士学科点专项科研基金(200802471005)

摘　　要：利用高频天平技术,在4种不同风场中对71种不同外形尺寸的矩形截面高层建筑刚性模型进行风洞试验,测得高层建筑横风向基底弯矩系数,考察建筑厚宽比、长细比及所处风场类型对高层建筑横风向基底弯矩系数均方根值的影响。试验结果表明,厚宽比的影响效果最显著,长细比的影响可以忽略不计,风场类型的影响随着厚宽比的不同而不同。基于这些风洞试验数据,给出基底弯矩系数均方根值的拟合公式并对拟合公式进行误差分析,通过与国内外相关研究成果的比较,验证拟合公式的精度与合理性,可以为荷载规范的修订和补充提供很好的参考。A total of 71 rigid models of tall buildings with typical square or rectangular sections are tested using high frequency force balance （HFFB） technique in four simulated wind fields, to obtain their crosswind base moment coefficients. Effects of parameters such as wind field, model aspect ratio and side ratio on the RMS values of the across-wind aerodynamic base moment coefficients are studied. The test results indicate that the side ratio has a strong effect on the across-wind fluctuating forces, the influence of model aspect ratio is negligible, and the influence of wind fields varies with different side ratios. New formulas for the RMS values of across-wind base moment coefficients are formulated by using the nonlinear least squares method, and the errors of the empirical formula are analyzed. The study provides technical support for the revisions and supplements of the load codes. By comparison with the wind tunnel test results and data in the literature, the accuracy and applicability of the present formulas are verified.

关 键 词：矩形高层建筑 风洞试验 横风向基底弯矩系数均方根值 拟合公式 

分 类 号：TU973.213[建筑科学—结构工程] TU317.1