不同施工阶段拱肋风荷载特性试验研究  

Experimental Research on Wind Load Characteristics of Arch Ribs in Different Construction Stages

作　　者：王云峰 郑云飞 李君君[2] 战启芳[2] 庞同军 Wang Yunfeng;Zheng Yunfei;Li Junjun;Zhan Qifang;Pang Tongjun(The 5th Engineering Co.Ltd.of the 16th Bureau Group of China Railway,Tangshan 064000,China;Shijiazhuang Institute of Railway Technology,Shijiazhuang 050041,China)

机构地区：[1]中铁十六局集团第五工程有限公司,河北唐山064000 [2]石家庄铁路职业技术学院铁道工程系,河北石家庄050041

出　　处：《石家庄铁道大学学报（自然科学版）》2022年第4期28-33,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：河北省“三三三人才工程”资助项目(A202101034);中铁十六局集团科技研发课题(FJJDQJSYF2020001)。

摘　　要：在施工阶段由于拱肋的约束尚未完全形成,导致其容易风致振动。为了明确施工阶段拱桥拱肋风荷载的分布特性,以北海冯家江大桥为例,通过风洞试验的方法,采用1∶100的试验模型,研究了拱肋不同位置、不同风向角、不同施工阶段下的风荷载特性的分布规律。结果表明,在施工阶段不同位置最大阻力系数绝对值达到2.6,相较桥规中建议值偏于危险需要重点关注,当施工进行到一定阶段后,靠近拱脚位置的阻力系数不再发生明显改变,随着施工进行,拱肋迎风面的体型系数未发生明显改变,其余3个面体型系数逐渐减小。Due to the lack of restraint of the arch rib in the construction stage,wind-induced vibration is prone to occur.In order to clarify the distribution characteristics of the wind load on the arch rib during the construction stage,this study was carried out on the Fengjiajiang Bridge in Beihai city.Through the method of wind tunnel test and using the test model of 1∶100,the distribution law of the wind load characteristics of the arch rib at different positions,different wind direction angles and different construction stages were studied.The result shows:During the construction stage,the absolute value of the maximum drag coefficient at different positions might reach 2.6,which is more dangerous than the current criterion and needs to be studied.When the construction progresses to a certain stage,the drag coefficient near the arch foot will no longer change significantly.In different construction stages,the body shape factor of the windward side of the arch rib does not change significantly,and the shape factor of the remaining three surfaces gradually decreases with the construction progresses.

关 键 词：公路桥梁 钢拱肋 风洞试验 气动力 体型系数 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]