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工程科学与技术:2010,42(2):58-63
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车辆荷载作用下混凝土箱梁桥桥面板局部振动分析
(1.昆明理工大学建筑工程学院,云南 昆明 650051;2.同济大学 桥梁工程系)
Local Dynamic Response in Deck Slab of a Concrete Box Girder Bridge
(1.Faculty of Civil Eng. and Architecture,Kunming Univ. of Sci. and Technol.,Kunming 650051,China;2.Dept. of Bridge Eng.,Tongji Univ.)
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投稿时间:2008-12-30    修订日期:2009-10-09
中文摘要: 研究车-桥耦合振动条件下,混凝土箱梁桥桥面板局部振动规律。推导车-桥耦合动力平衡方程,用板单元建立简支箱梁桥有限元模型,采用3维7自由度车辆模型,由路面功率谱密度函数模拟得到等级分别为“理想”、“好”和“差”的路面不平度函数。通过数值模拟计算桥面板不同位置的竖向位移、纵向弯矩和横向弯矩的动力放大系数(DAF)。分别对车道位置、路面等级、车速和桥梁阻尼进行了参数分析。结果表明,车辆荷载作用下,桥面板不同位置的局部DAF值、同一位置由不同响应量得到的DAF值之间均存在很大差异,采用统一的DAF来计算车辆对桥面板的冲击作用不甚合理。路面不平度是影响桥面板车致振动最为重要的因素;而车速次之,且很难找到明确的函数关系用于描述车速对箱梁桥面板的局部动力放大系数的影响。
Abstract:With the effect of vehicle-bridge coupling considered, the local dynamic response in deck slabs of concrete box girder bridges was analyzed under the condition of vehicle-bridge coupling vibration. The mathematical model assumed a finite element representation of the slabs with shell elements. The vehicle simulation used a 3 dimensional linear vehicle model with 7 independent degrees of freedom. A well-known power spectral density of road pavement profiles was used to define the road surface roughness as Perfect, Good and Poor roads, respectively. Response data were produced on concrete highway bridge decks made of straight box section girder. In this way, a parametric study was conducted to analyze the effects of factors such as road surface roughness, vehicle speed, and bridge damping on the bridge dynamic amplification factors (DAFs). The analytical results suggested that the local DAFs in different locations of the slab or in the same location but made of different response vary widely. It is irrational to account for the impact effect of vehicles on the slab with a single DAF. Road roughness is the most important parameter affecting the dynamic behaviour of deck slabs. There is no critical speed or clear relationship between the DAFs and speed.
文章编号:200800713     中图分类号:    文献标志码:
基金项目:云南省应用基础研究资助项目(2008ZC026M);昆明理工大学科学研究基金(2008-044);昆明理工大学建筑工程学院科学研究基金
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杨建荣,李建中.车辆荷载作用下混凝土箱梁桥桥面板局部振动分析[J].工程科学与技术,2010,42(2):58-63.
Yang Jianrong,Li Jianzhong.Local Dynamic Response in Deck Slab of a Concrete Box Girder Bridge[J].Advanced Engineering Sciences,2010,42(2):58-63.