DYNAMIC ANALYSIS OF EXISTING CONTINUOUS BRIDGE
DYNAMIC ANALYSIS OF EXISTING CONTINUOUS BRIDGE
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DOI：
10.1061/(asce)1084-0702(1998)3:1(28
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发表时间：
1998-02
影响因子：
3.6
通讯作者：
M. Fafard;M. Laflamme;M. Savard;Mallikarjuna Bennur
中科院分区：
文献类型：
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作者：
M. Fafard;M. Laflamme;M. Savard;Mallikarjuna Bennur
本文研究了动荷载对既有连续桥梁动力放大系数（DAF）的影响。一个三维分析模型，以理想化的车辆和有限元模型来分析桥梁已经开发。魁北克交通部对这座现有桥梁进行了实验性测试。两个车辆模型，有7和11自由度和/或没有拖车，被认为是在桥梁和车辆之间的相互作用的分析。根据国际标准化组织的规范，引道和桥面的路面粗糙度是从非常好、良好和平均道路的功率谱密度函数中产生的。从本模型得到的解决方案进行了比较与实验结果为不同的车速。DAF是从当前有限元模型中计算的，用于三种不同类型的测量（位移、应变和反应）。数值结果表明，由位移计算的DAF小于由应变和反力估计的DAF。结果表明，现行设计规范往往低估了动力放大系数，特别是对大跨度连续梁桥。
This paper presents the investigation of the effect of dynamic loads on the dynamic amplification factors (DAFs) of an existing continuous bridge. A three-dimensional analytical model to idealize the vehicle and a finite element model to analyze the bridge have been developed. Experimental testing of this existing bridge has been conducted by the Ministry of Transportation, Quebec. Two vehicle models, having 7 and 11 degrees of freedom with and/or without trailers, are considered in the analysis of the interaction between the bridge and vehicles. Based on International Standards Organization specifications, the road-surface roughness of the approach roadways and bridge deck is generated from the power-spectral density function for very good, good, and average roads. The solutions obtained from the present models are compared with the experimental results for different vehicle speeds. The DAFs are computed from the present finite element model for three different types of measurements (displacements, strains, and reactions). The numerical results show that the DAFs computed with displacements are less than those estimated from strains and reactions. It is concluded that current design codes tend to underestimate dynamic amplification factors, especially for long-span continuous bridges.