高墩大跨PC连续刚构桥荷载试验评价关键参数研究

发布时间：2018-10-24 22:27

【摘要】：PC连续刚构桥是公路桥梁中常见的桥型之一，如何快速、准确、经济地对桥梁结构进行承载力检测已成为国内外桥梁界的研究热点。目前，我国已建成的高墩大跨预应力混凝土连续刚构桥荷载试验测试并没有统一的规范标准可以参考，承担测试的单位基本上都是依照专业通用标准、专业专用标准以及已有的PC连续刚构桥荷载试验测试项目及加载工况。因此高墩大跨PC连续刚构桥荷载试验在荷载效率系数的取值、荷载试验工况的选取、校验系数的合理取值范围等方面还不是很完善。因此，有必要对上述问题进行研究。针对目前高墩大跨PC连续刚构桥荷载试验存在的这些问题，本文主要研究了以下三个方面的问题：（1）对高墩大跨PC连续刚构桥荷载效率系数进行了降低优化研究。本文以湖北省宜昌市魏家洲特大桥荷载试验工况为例，，对其第一工况和第四工况的荷载效率系数进行了优化研究，最后以湖北省兴山县竹溪墓大桥荷载效率系数的降低优化为例，验证了本文所提方法在实际工程中的实用性与准确性。（2）根据高墩大跨PC连续刚构桥自身结构特点，提出了荷载试验加载工况的合并优化问题，即将多个荷载试验加载工况合并成一个试验工况进行加载测试。最后，以三水河特大桥的荷载试验工况优化为例，确定了高墩大跨PC连续刚构桥结构可以进行合并的工况。（3）分部位对高墩大跨PC连续刚构桥主梁的校验系数取值范围进行了研究。确定出了高墩大跨PC连续刚构桥主梁各部位校验系数服从95%置信区间的取值范围，并把校验系数的取值范围分为A类、B类、C类、D类、E类5个类别。通过对魏家洲特大桥及竹溪墓大桥荷载效率系数的优化研究，可以确定高墩大跨PC连续刚构桥荷载效率系数的取值可以适当降低；通过对三水河特大桥荷载试验工况的优化研究，可以得出第11跨和第14跨主梁最大正弯矩工况和挠度工况可以合并为一个工况；通过分析国内大量高墩大跨PC连续刚构桥主梁各部位校验系数，可以得出高墩大跨PC连续刚构桥主梁主要测试工况校验系数的合理取值范围。
[Abstract]:PC continuous rigid frame bridge is one of the most common bridge types in highway bridges. How to test the bearing capacity of bridge structures quickly, accurately and economically has become a hot research topic in the field of bridges at home and abroad. At present, there is no uniform standard for load test of long-span prestressed concrete continuous rigid frame bridges with high piers built in our country. The units that undertake the tests are basically in accordance with the general professional standards. Professional standards and existing PC continuous rigid frame bridge load test items and loading conditions. Therefore, the load test of PC continuous rigid frame bridge with high pier and long span is not perfect in terms of load efficiency coefficient, load test condition, reasonable range of check coefficient and so on. Therefore, it is necessary to study the above problems. Aiming at these problems existing in load test of PC continuous rigid frame bridge with high pier and long span, this paper mainly studies the following three problems: (1) the load efficiency coefficient of PC continuous rigid frame bridge with high pier and long span is reduced and optimized. In this paper, the load efficiency coefficients of Weijiazhou Bridge in Yichang City, Hubei Province, are optimized under the first and fourth working conditions. Finally, taking the reduction and optimization of load efficiency coefficient of Zhuxi Tomb Bridge in Xingshan County, Hubei Province as an example, the practicability and accuracy of the proposed method in practical engineering are verified. (2) according to the structural characteristics of PC continuous rigid frame bridge with high piers and large spans, The combined optimization problem of load test loading condition is put forward, which combines multiple load test conditions into one test condition to carry out load test. Finally, taking the load test condition optimization of Sanshui River Bridge as an example, The condition that the structure of PC continuous rigid frame bridge with high pier and long span can be combined is determined. (3) the range of check coefficient of the main beam of PC continuous rigid frame bridge with high pier and long span is studied. The range of check coefficient of each part of PC continuous rigid frame bridge with high pier and long span is determined from 95% confidence interval, and the range of check coefficient is divided into five categories: class A, class B, class C, class D and class E. Based on the optimization of load efficiency coefficients of Weijiazhou Bridge and Zhuxi Tomb Bridge, it can be determined that the load efficiency coefficient of PC continuous rigid frame bridge with high piers and long span can be reduced appropriately. By optimizing the load test conditions of Sanshuihe Bridge, it can be concluded that the maximum positive moment and deflection of the 11th span and the 14th span of the main girder can be combined into one working condition. By analyzing the check coefficients of the main beam of a large number of high pier and long span PC continuous rigid frame bridges in China, the reasonable range of the check coefficients of the main girder of the high pier and long span PC continuous rigid frame bridge under the main test conditions can be obtained.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446.1

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