大跨度连续梁桥非一致地震响应分析

发布时间：2018-03-18 12:35

本文选题：连续梁桥　切入点：行波效应　出处：《大连交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：通常情况下,桥梁结构的地震反应分析是假定所有桥墩墩底的地震波振动是一致的,这种假定计算的结果存在较大的误差,为了使有限元软件计算的结果更贴切实际情况,采用非一致输入法对连续梁桥进行分析。以丹大快速铁路花园口1号路连续梁桥为研究对象,采用ANSYS有限元软件分析了行波效应对连续梁桥固定墩墩底剪应力、固定墩墩底拉应力和墩间最大相对位移的影响,通过加载同强度等级的不同地震波,寻找响应结果的数值之间存在差异性的原因。研究结果表明：在同强度等级不同地震波的非一致激励下,桥梁固定墩墩底剪应力、固定墩墩底拉应力及墩间最大相对位移的响应存在差异性；行波效应对连续梁桥固定墩墩底剪应力、固定墩墩底拉应力和墩间最大相对位移的影响明显,墩高对行波效应下固定墩墩底剪应力和固定墩墩底拉应力的响应存在影响,但影响的程度不大；行波效应增强了连续梁桥墩间的最大相对位移响应,墩高对行波效应下墩间最大相对位移的响应存在影响,但是影响的程度不大；沿纵桥向改变行波的输入方向,对连续梁桥固定墩墩底剪应力、固定墩墩底拉应力和墩间最大相对位移的影响很小。为验证ANSYS计算结果的正确性,进行了简单的解析分析,通过将解析分析的结果和ANSYS计算的结果相对比,可以证明ANSYS计算结果的正确性,通过解析分析的结果,发现固定墩墩底剪应力受地震波行波作用的影响因素有：地震波表面视波速、地震波卓越频率和结构固有频率。为研究不同跨度的连续梁桥在行波效应下的响应结果,将丹大快速铁路汤池连续梁桥与花园口1号路连续梁桥做对比研究,研究结果表明：跨度不同的两座连续梁桥,固定墩墩底剪应力、固定墩墩底拉应力和墩间最大相对位移的变化程度受行波效应的影响是不同的。
[Abstract]:In general, the seismic response analysis of bridge structures assumes that the seismic wave vibration at the bottom of all piers is the same, and there is a large error in the results of this assumption. In order to make the results of the finite element software more appropriate to the actual situation, The nonuniform input method is used to analyze the continuous beam bridge. Taking Huayuankou No. 1 continuous beam bridge of Danda Express Railway as the research object, the effect of traveling wave effect on the shear stress at the bottom of the fixed pier, the tensile stress at the bottom of the fixed pier and the maximum relative displacement between the piers of the continuous beam bridge is analyzed by ANSYS finite element software. By loading different seismic waves of the same intensity grade, the reasons for the difference between the values of the response results are found. The results show that the shear stress at the bottom of the pier of the fixed pier of the bridge is subjected to the non-uniform excitation of different seismic waves of the same intensity grade. The effect of traveling wave effect on shear stress at the bottom of fixed pier, tensile stress at the bottom of fixed pier and maximum relative displacement between piers is obvious, and the effect of traveling wave effect on the shear stress at the bottom of fixed pier and the maximum relative displacement between two piers is obvious. The height of the pier has an effect on the responses of shear stress at the bottom of the fixed pier and the tensile stress at the bottom of the fixed pier under the traveling wave effect, but to a lesser extent, the traveling wave effect enhances the maximum relative displacement response between the piers of continuous beam and bridge. The height of piers has an effect on the response of maximum relative displacement between piers under the traveling wave effect, but to a lesser extent, the shear stress of the fixed pier bottom of a continuous beam bridge is changed along the longitudinal bridge direction by changing the input direction of the traveling wave. The influence of the tensile stress on the bottom of the fixed pier and the maximum relative displacement between the piers is very small. In order to verify the correctness of the ANSYS calculation results, a simple analytical analysis is carried out. By comparing the analytical results with the results of the ANSYS calculations, the correctness of the ANSYS calculation results can be proved. It is found that the influencing factors of shear stress at the pier bottom of fixed pier are as follows: apparent wave velocity on the surface of seismic wave, excellent frequency of seismic wave and natural frequency of structure. In order to study the response results of different span continuous beam bridges under traveling wave effect, a comparative study is made between the Tangchi continuous beam bridge and Huayuankou Road 1 continuous beam bridge in Danda Express Railway. The results show that two continuous beam bridges with different spans are used. The shear stress at the bottom of the fixed pier, the tensile stress at the bottom of the pier and the maximum relative displacement between the piers are affected by the traveling wave effect.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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