城市立交小半径独柱墩弯桥梁体偏移分析

发布时间：2018-04-13 12:49

本文选题：弯梁桥 + 梁体偏移　；参考：《合肥工业大学》2015年硕士论文

【摘要】：随着我国公路和城市道路的迅速发展,高架道路及立体交叉工程愈来愈多,弯梁桥的运用越来越广泛。与直线梁桥相比,弯梁桥的弯扭耦合效应显著,对结构的受力不利而容易引起病害,而小半径独柱墩弯梁桥则甚为严重。针对近些年城市立交小半径独柱墩弯梁桥大量出现了横向偏移和支座破坏等病害,本文依托合肥市五里墩立交匝道桥,对城市立交小半径独柱墩弯梁桥梁体的侧向偏移问题进行了比较系统的研究,并提出来相应的合理的预防加固措施,论文研究具有重要的理论意义和工程实用价值。论文参考相关文献资料,论述了弯梁桥的发展状况、国内外研究概况及其计算理论等。结合该类桥梁出现的侧向偏移问题,本文重点研究分析了其成因,主要分两个方面：内在因素(如曲率半径、支撑方式、宽跨比、伸缩缝等)和外在因素(如车辆偏载、离心力作用、预应力作用、温度荷载等)。以合肥市五里墩立交桥某匝道消缺加固工程为背景,分别建立了基于梁单元和实体单元的全桥空间有限元模型,分析了不同的内在因素在相同的温度荷载作用(整体温升)下和不同的外在因素(主要是外部荷载)作用下,两种状况下弯桥梁体的偏移情况。结合城市立交小半径独柱墩弯梁桥和合肥市五里墩立交独柱匝道弯桥病害的实际情况,本文重点研究分析了温度效应对城市立交小半径独柱墩弯梁桥梁体偏移的影响,主要考虑季节温度和日照温度(包括竖向梯度温度和南北向温差)对梁体偏移的影响,最后结合加固后的A1匝道横向偏移监测数据,对不同温度荷载作用下的偏移进行分析,验证了温度对桥梁横向偏移影响的结论。通过对比分析得到,内外在因素综合影响着弯梁桥梁体的受力状态和偏移情况。我们可以从设计和施工上改善内外在影响因素对其横向位移的影响,同时在运营阶段加强对其管理和维修养护,从而保证该类桥梁长期安全稳定运营。
[Abstract]:With the rapid development of highway and urban road in our country, more and more viaduct and intersecting engineering are used, and the application of curved girder bridge is more and more extensive.Compared with the straight beam bridge, the bending and torsional coupling effect of the curved beam bridge is obvious, which is unfavorable to the structure and easily causes the disease, while the small radius single column pier curved beam bridge is very serious.In view of the large number of diseases such as lateral migration and support failure in the small radius single-column curved girder bridge of urban interchange in recent years, this paper relies on the ramp bridge of Wulidun interchange in Hefei.This paper makes a systematic study on the lateral displacement of the curved beam bridge with small radius and single column pier of urban interchange, and puts forward the corresponding reasonable preventive and reinforcement measures. The research in this paper has important theoretical significance and practical value in engineering.With reference to relevant documents, the paper discusses the development of curved girder bridge, research situation and calculation theory at home and abroad.Combined with the lateral displacement problem of this kind of bridge, this paper focuses on the causes of its formation, which are mainly divided into two aspects: internal factors (such as radius of curvature, support mode, ratio of width to span, expansion joint, etc.) and external factors (such as vehicle partial load).Centrifugal force, prestress, temperature load, etc.On the background of a ramp eliminating and strengthening project of Wulidun overpass in Hefei City, the spatial finite element models of the whole bridge based on beam element and solid element are established, respectively.Under the same temperature load (global temperature rise) and different external factors (mainly external load), the deflection of curved bridge body is analyzed under different internal factors under the same temperature load (whole temperature rise) and different external factors (mainly external load).Combined with the actual condition of the disease of the small radius single column pier curved beam bridge of urban interchange and the single column ramp bend bridge of Wuli pier interchange in Hefei, this paper focuses on the analysis of the effect of temperature effect on the deflection of the small radius single column pier curved beam bridge in the city interchange.The influence of seasonal temperature and sunshine temperature (including vertical gradient temperature and South-North temperature difference) on beam migration is considered. Finally, the migration under different temperature loads is analyzed by combining with the strengthened A1 ramp lateral migration monitoring data.The effect of temperature on the lateral displacement of the bridge is verified.Through comparison and analysis, it is concluded that internal and external factors affect the force state and deviation of curved beam bridge.We can improve the influence of internal and external factors on the lateral displacement in design and construction, at the same time, we can strengthen the management and maintenance of the bridge in the operation stage, so as to ensure the long-term safe and stable operation of this kind of bridge.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;U445.7

【相似文献】