基于高墩连续刚构桥双悬臂状态的特点及横桥向一阶振型,考虑平均风荷载与结构脉动风荷载背景响应及共振响应,给出了方便工程应用的计算墩底横桥向弯矩和剪力等效风荷载及风载内力的简化计算方法。为验证简化计算方法的精度,分别采用抖振频域分析方法及简化计算方法对2个典型算例进行了分析,并与现行规范静阵风系数的结果进行比较。结果表明:简化计算方法具有较好的精度,适于工程应用;若忽略脉动风共振响应的影响,对高墩桥梁其结果将偏小较多;高墩桥梁的桥墩风荷载很大,其对墩底风载内力的影响甚至可能超过主梁,应引起足够重视。
Abstract
Based on characteristics of high pier continuous rigid frame bridge in double cantilever state and its transverse first order mode shape, considering resonant responses and background responses of average wind loads and structural fluctuating wind loads, a simplified calculation method of equivalent wind loads of transverse bending moment and shear force of pier-bottom and its internal force on high pier continuous rigid frame bridge was given. In order to verify calculated accuracy of the simplified calculation method, buffeting frequency domain analysis method and the simplified calculation method were used to analyze two typical examples. The calculated results by the two methods and static gust factor result of wind-resistant design specification were compared. The results show that the method has good accuracy, and is applicable to engineering application. The results will be far smaller for high pier bridges if resonant responses of fluctuating wind are neglected. The wind load on pier of high pier bridge is big, its influence on internal force of wind load at pier bottom even surpasses the influence of main beam on the internal force. It should induce much attention.
关键词
桥梁工程 /
高墩连续刚构桥 /
简化计算 /
等效风荷载 /
双悬臂 /
背景响应 /
共振响应
{{custom_keyword}} /
Key words
bridge engineering /
high pier continuous rigid frame bridge /
simplified calculation /
equivalent wind load /
double cantilever /
background response /
resonant response
{{custom_keyword}} /
中图分类号：
U441.2
{{custom_clc.code}}
({{custom_clc.text}})
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] DAVENPORT A G.The Application of Statistical Concepts to the Wind Loading of Structures[J].ICE Proceedings,1961,19(4):449-472.
[2]DAVENPORT A G.Buffeting of a Suspension Bridge by Storm Winds[J].Journal of the Structural Division,1962,88(3):233-270.
[3]DAVENPORT A G.The Response of Slender,Line-like Structures to a Gusty Wind[J].ICE Proceedings,1962,23(3):389-408.
[4]DAVENPORT A G.Gust Loading Factors[J].Journal of the Structural Division,1967,93(ST3):11-34.
[5]KASPERSKI M.Extreme Wind Load Distributions for Linear and Nonlinear Design[J].Engineering Structures,1992,14(1):27-34.
[6]HOLMES J D.Equivalent Time Averaging in Wind Engineering[J].Journal of Wind Engineering and Industrial Aerodynamics,1997,72:411-419.
[7]ZHOU Y,KAREEM A.Gust Loading Factor:New Model[J].Journal of Structural Engineering,2001,127(2):168-175.
[8]GB 50009—2001,建筑结构荷载规范[S].
GB 50009—2001,Load Code for the Design of Building Structures[S].
[9]JTG/T D60-01—2004,公路桥梁抗风设计规范[S].
JTG/T D60-01—2004,Wind-resistant Design Specification for Highway Bridges[S].
[10]项海帆.现代桥梁抗风理论与实践[M].北京:人民交通出版社,2005.
XIANG Hai-fan.Modern Theory and Practice on Bridge Wind Resistance[M].Beijing:China Communications Press,2005.
[11]刘志刚,陈艾荣.等长双悬臂梁等效风荷载实用计算方法[J].同济大学学报:自然科学版,2002,30(5):599-603,638.
LIU Zhi-gang,CHEN Ai-rong.Practical Method for Calculating Equivalent Wind Loads on Double Cantilever Bridges[J].Journal of Tongji University:Nat-ural Science,2002,30(5):599-603,638.
[12]李开言.双肢薄壁高墩刚构桥悬臂施工稳定性与风效应研究[D].长沙:中南大学,2005.
LI Kai-yan.Researches on Stability and Wind Effects of Rigid Frame Bridges with Flexible Twin Piers During Cantilever Erection[D].Changsha:Central South University,2005.
[13]龚巧艳.大跨连续刚构桥风荷载响应研究[D].长沙:中南大学,2006.
GONG Qiao-yan.Researches on Wind Response of the Long Span Continuous Rigid Frame Bridge[D].Changsha:Central South University,2006.
[14]宁晓骏,李 睿,杨昌正,等.超高墩设计研究[J].公路交通技术,2008(1):87-90.
NING Xiao-jun,LI Rui,YANG Chang-zheng,et al.Design Study on Supertall Pier[J].Technology of Highway and Transport,2008(1):87-90.
[15]DYRBYE C,HANSEN S O.Wind Loads on Structures[M].Chichester:John Wiley & Sons,1997.
[16]MENDES P A,BRANCO F A.Unbalanced Wind Buffeting Effects on Bridges During Double Canti-lever Erection Stages[J].Wind and Structures,2001,4(1):45-62.
[17]刘志刚.桥梁顺风向风荷载研究[D].上海:同济大学,2001.
LIU Zhi-gang.Researches on Along Wind Loads on Bridges[D].Shanghai:Tongji University,2001.
[18]陈政清.桥梁风工程[M].北京:人民交通出版社,2005.
CHEN Zheng-qing.Wind Engineering of Bridge[M].Beijing:China Communications Press,2005.
[19]TAMURA Y,KAWAI H,UEMATSU Y,et al.Wind Load and Wind-induced Response Estimations in the Recommendations for Loads on Buildings[J].Engineering Structures,1996,18(6):399-411.
[20]张相庭,王志培,黄本才,等.结构振动力学[M].2版.上海:同济大学出版社,2005.
ZHANG Xiang-ting,WANG Zhi-pei,HUANG Ben-cai,et al.Mechanics of Vibrations[M].2nd ed.Shanghai:Tongji University Press,2005.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
基金
浙江省交通厅科技计划项目(2008H38)
{{custom_fund}}
{{custom_fund}}
PDF全文下载(372 KB)
