抗风索式张弦梁抗风性能静力试验研究  

STATIC EXPERIMENTAL RESEARCH ON WIND RESISTANCE OF BEAM STRING STRUCTURE WITH WIND CABLE

作　　者：翟福胜 白正仙[1,2] 张腾飞[1] ZHAI Fusheng;BAI Zhengxian;ZHANG Tengfei(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京工业大学,工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《工业建筑》2018年第7期127-134,共8页Industrial Construction

基　　金：国家重点研发计划(2016YFC0701504);北京市教委科技计划面上项目(KM201310005024)

摘　　要：为验证抗风索有效性,探究抗风索对延迟下弦索松弛及松弛后整体刚度影响,以及抗风撑杆高度和不对称风荷载对结构抗风性能的影响规律,以拱形张弦梁结构为研究对象,进行了抗风索式张弦梁静力加载试验及相应数值分析。试验模型由跨度3 m、矢高120 mm、垂度180 mm、榀间距1 m的3榀张弦梁组成。施加节点集中荷载,采用自主设计的张弦梁抗风撑杆节点,通过改变抗风撑杆高度、抗风索索力和荷载类型等方式共设计了3种模型和9个加载工况。研究结果表明：有限元分析结果能与试验结果较好吻合,提高了抗风索的张弦梁抗风性能,抗风索的存在会改善结构的整体刚度;通过将模型倒置再静力加载方式模拟风吸力,张弦索逐渐松弛,抗风索成为主要抗风构件;抗风撑杆高度对张弦梁抗风性能影响较大,模型1对应抗风撑杆高度较为合理;张弦梁结构对非对称风荷载较为敏感,增大抗风撑杆的高度能有效提高结构的整体刚度,从而有效抵抗不对称风荷载。To verify the validity of anti-wind cable of beam string structure,to explore the effect of anti-wind cable on delaying string＇s relaxation and the overall stiffness,the static loading test of arch-shaped beam string structure with anti-wind cable was carried out and the corresponding numerical analysis was followed. The experimental model consisted of three pieces of beam string structure,which span 3 m,rise 120 mm,sag 180 mm and spacing distance1 m. Three modes and nine loading conditions were designed with variation of the height of anti-wind strut,wind cable tension and load type. Self-designed connection between anti-wind strut and anti-wind cable was used,and centralized nodal loads were applied. The results of finite element method analysis are consistent with those from the experiment.The wind-resistant performance and overall stiffness of structure with anti-wind cable are improved compared with those without anti-wind cable. The anti-wind cables play a key role to resist the wind when the string is loose,where the model was inverted and applied vertical static load to simulate wind suction. The wind resistance performance is obviously related to the height of anti-wind cable strut,and model 1 is the most reasonable choice here. Due to serious sensitivity to the asymmetric wind load than symmetric wind for beam string structure,increasing the height of the wind resistance strut can effectively improve the overall stiffness and the asymmetric wind performance.

关 键 词：张弦梁 抗风索 抗风撑杆高度 不对称荷载 试验研究 

分 类 号：TU352.2[建筑科学—结构工程]