气柱共振对开洞结构内压风洞试验的影响  

Effect of gas resonance on wind tunnel experiment for internal pressure in a building with a dominant opening

作　　者：余先锋 谢壮宁[2] 刘海明[1] 张承[3] 王旭 董锐[1] YU Xianfeng;XIE Zhuangning;LIU Haiming;ZHANG Cheng;WANG Xu;DONG Rui(State Key Laboratory of Bridge Engineering Structural Dynamics,China Merchants Chongqing Communication Research&Design Institute Co.,Ltd.,Chongqing 400067,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China;Shenzhen Bridge Design&Research Institute Co.,Ltd.,Shenzhen 518052,China)

机构地区：[1]招商局重庆交通科研设计院有限公司桥梁工程结构动力学国家重点实验室,重庆400067 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510640 [3]深圳市桥博设计研究院有限公司,广东深圳518052

出　　处：《振动与冲击》2018年第4期55-59,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(51408227);桥梁工程结构动力学国家重点实验室开放基金(201601;201502;201403);重庆市基础与前沿研究计划一般项目(CSTC2017JCYJAXD187)

摘　　要：气柱共振对开洞结构内压风洞试验的影响不容忽视,尤其是连通的两空间或多空间结构。阐述了内压风洞试验相似律及体积补偿要求,即按原型与实验风速比的平方进行内部体积补偿,且体积补偿箱须遵守"深且窄"的原则。从往复压缩机管道系统引入了内压模型腔体的气柱共振频率计算公式。对两种补偿体积的开洞两空间结构进行内压风洞试验,试验结果证实了当体积补偿箱过于深长时,会出现气柱共振现象从而影响内压测量的精度。The effect of gas resonance on wind tunnel experiment for internal pressure in a building,especially in a two-compartment or multi-compartment building,with a dominant opening cannot be omitted.Similarity and additional internal volume requirements for internal pressure experiment were firstly described.The building internal cavity volume used at model-scale should be distorted by a factor equaling the square of the ratio of the full-scale to model-scale velocities,and the additional internal volume must be a deep and narrow cavity.Then,the gas natural frequency equation was introduced from the reciprocating compressor piping system into the wind tunnel studies on internal pressure.Finally,wind tunnel experiments on internal pressure for a two-compartment building with two kinds of additional distorted volumes were carried out.Results show that the measured internal pressure response will be inaccurate because of the influence of gas resonance when the additional distorted volumes are much deeper and narrower.

关 键 词：开洞结构 风致内压 气柱共振 风洞试验 相似定律 

分 类 号：TU312[建筑科学—结构工程] TU317