设置结构缝的矩形高层建筑风荷载及风致响应研究  

Study on wind loads and wind-induced responses of rectangular tall buildings with structural joints

作　　者：袁家辉 陈水福[2] 夏俞超 刘奕[2] YUAN Jiahui;CHEN Shuifu;XIA Yuchao;LIU Yi(WISDRI City Construction Engineering&Research Incorporation Ltd.,Wuhan 430063,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]中冶南方城市建设工程技术有限公司,湖北武汉430063 [2]浙江大学建筑工程学院,浙江杭州310058 [3]浙江理工大学建筑工程学院,浙江杭州310018

出　　处：《中南大学学报（自然科学版）》2024年第7期2663-2676,共14页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51878607)。

摘　　要：大长宽比的矩形高层建筑往往需要设置结构缝,设缝后建筑物的风压分布仍由整体建筑外形决定,但各建筑单元的风荷载及风致响应与单一建筑相比会有很大不同。为探究设缝建筑中各单元的风荷载和风振特性,本文以长宽比为3的单一建筑为参照对象,对长宽比分别为6和9、在长边分别设置1道和2道结构缝的矩形高层建筑进行了同步测压风洞试验;分析正交风向下不同建筑单元的三分力系数、功率谱和整体体型系数特性;对不同建筑单元采用同一结构参数计算其风振响应,探讨不同单元的顶层位移和加速度响应随风向角的变化特点,考察正交风向下这些响应的频谱特性。研究结果表明:不同单元的气动力系数和气动力谱差别明显,且短边迎风时的差异大于长边迎风时的差异;考虑全风向角情况,设置结构缝的建筑两侧单元整体体型系数比同等长宽比的单一建筑的小,中间单元整体体型系数与单一建筑的基本相同;两侧单元的顶层平动风振响应比单一建筑的小,扭转风振响应比单一建筑的略大,中间单元的平动和扭转响应都明显比单一建筑的小。因此,设置结构缝的矩形高层建筑不同单元的抗侧力构件应采取差异化布置。Structural joints are required for rectangular tall buildings with large length-to-width ratios.Despite the presence of joints,the wind pressure distribution on the building is still affected by the overall building shape.Additionally,the wind loads and wind-induced responses of individual building units can differ significantly when a single and uninterrupted building is compared.In order to investigate the wind loads and wind-induced vibrations of building units in structures with joints,synchronous wind tunnel tests were conducted on rectangular tall buildings with length-to-width ratios of 6 and 9,each with one or two structural joints along the long sides.The three-force coefficients,power spectra,and overall shape coefficients of different building units in orthogonal wind directions were analyzed.Furthermore,the wind-induced responses of different units using the same structural parameters were calculated to explore their variations with wind direction angles.The spectral characteristics of these responses in orthogonal wind directions were also examined.The results show that significant differences exist in aerodynamic coefficients and aerodynamic spectra among different building units,with greater disparities observed when the shorter sides face the wind.When considering a 360°wind direction scenario,the overall shape coefficient of the building units on both sides of the structurally gapped buildings are smaller than those of a single building with an equivalent length-to-width ratio.The overall shape coefficient of the intermediate building unit is similar to that of the single building.The lateral responses of the building units on both sides are smaller than those of a single building.The torsional responses of these gapped buildings are slightly greater than those of the single building.However,the lateral and torsional responses of the intermediate building unit are significantly smaller than those of the single building.Therefore,for structurally gapped rectangular high-rise buildings,the lateral

关 键 词：高层建筑 风洞试验 结构缝 气动力系数 整体体型系数 风振响应 

分 类 号：TU312[建筑科学—结构工程]