纵横梁拓宽加固既有T梁桥的参数分析

发布时间：2018-01-20 20:13

本文关键词： T梁桥拓宽加固纵梁横梁弯矩挠度有限元法参数分析　出处：《世界桥梁》2015年05期 　论文类型：期刊论文

【摘要】：为了指导既有T梁桥纵横梁拓宽加固设计,确定最优参数,以一座跨长20m、桥面宽6m的T梁桥拓宽加固为背景,建立T梁桥纵横梁拓宽加固主梁(拓宽后桥面宽9m)计算模型,对新建横梁的数量及位置、新建纵梁与横梁的刚度、新旧基础间相对沉降量等进行了参数分析。结果表明:对于跨长20m、桥面宽6m(拓宽后宽9m)的T梁桥,在跨中设置1道横梁较适宜;新建横梁的刚度越大,结构的整体性越好,但随着横梁刚度增大横梁自重增加,横梁的最佳截面尺寸为60cm×30cm;随着纵梁高度的增大,结构的最大挠度减小,旧主梁的最大弯矩减小,新主梁的弯矩增大,新建纵梁高度取250cm为宜;新旧基础间的相对沉降对结构支点截面T梁翼板根部受力影响较大,需采取有效的措施来减少相对沉降。
[Abstract]:In order to guide the design of widening and strengthening of longitudinal and transverse beams of existing T-beam bridges and determine the optimal parameters, a T-beam bridge with 20m span and 6m wide deck is used as the background. The calculation model of the main beam (9m width of the bridge deck after widening) is established. The number and position of the newly built beams and the stiffness of the new beams are also discussed. The relative settlement between the new and the old foundation is analyzed. The results show that for the T-beam bridge with 20m span and 6m wide deck width (9m width after widening), it is more appropriate to set 1 beam in the middle of the span. The greater the stiffness of the new beam, the better the integrity of the structure, but with the increase of the stiffness of the beam, the optimum cross-section size of the beam is 60cm 脳 30cm. With the increase of the height of the longitudinal beam, the maximum deflection of the structure decreases, the maximum moment of the old main beam decreases, the bending moment of the new main beam increases, and the height of the new longitudinal beam is 250cm. The relative settlement between the new and the old foundation has a great influence on the root of the flange of the T-beam with fulcrum section of the structure, so effective measures should be taken to reduce the relative settlement.
【作者单位】：长沙理工大学土建学院;湖南理工学院土建学院;长沙学院;
【基金】：湖南省教育厅青年项目(12B056) 长沙市科技计划项目(K1309003-11)
【分类号】：U448.212;U445.72
【正文快照】： 1概述随着经济的发展,许多低等级公路需要拓宽提质改造,道路上的桥涵成了拓宽提质改造工程的关键。部分桥涵由于建设时资金少、荷载等级低、施工技术水平不高及运营后因经费原因养护与管理难以到位、日久风化等原因,加上使用期间车流量剧增、超载现象严重,出现了许多影响使用

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