黄坪大桥加固技术及静载试验研究

发布时间：2018-04-03 07:04

本文选题：箱型拱桥　切入点：病害分析　出处：《西南科技大学》2017年硕士论文

【摘要】：我国的钢筋混凝土箱形拱桥多建于上世纪60~90年代,距今已有数十年历史桥梁受外界荷载、自然环境等因素影响,在使用过程中会造成不同程度的损伤,其结构功能和承载力均会下降。因此,既有桥梁的病害、损伤调查,并及时加固有病害的桥梁显得尤为重要,对桥梁的安全运营具有重要意义。论文对某既有钢筋混凝土箱形拱桥的加固设计和静载试验进行了系统研究,首先对既有桥梁损伤情况进行检查,根据检查结果和技术状况评定并结合数值模拟研究确定合理的加固方案,实施加固措施,并对加固后桥梁进行荷载试验检测,以确定加固方案的有效性。论文主要进行了以下几个方面工作:1.通过大量的实桥调研和资料收集,归纳总结了钢筋混凝土桥梁的病害、损伤类型,并分析其损伤机理和影响因素以及对桥梁结构的影响;总结钢筋混凝土拱桥的一般加固方法和承载能力评定方法,阐述了各个方法的优缺点和适用情况。2.论文以黄坪大桥加固工程作为研究背景,通过对该桥进行整体外观检查,了解桥梁的病害情况,分析损伤因素,并依据规范进行技术状况综合评定。依据评定结论,建立全桥有限元计算模型,并拟定了多种加固方案,分析计算不同方案的优劣,比选出最适合该桥的方案,最后进行加固设计并实施加固工程。3.对加固后的钢筋混凝土桥梁进行承载能力和工作性能评定,首先利用有限元软件进行内力计算,确定静载试验的测试截面,选取最不利工况对桥梁进行荷载实验,并通过有限元进行静载模拟,比较静载实测值和有限元模拟值,对加固后桥梁的承载能力和工作性能进行评定,以评价其加固效果。
[Abstract]:Most of the reinforced concrete box arch bridges in China were built in the 1960s and 1990s. The bridges have been affected by external loads, natural environment and other factors for decades, which will cause damage to different degrees in the process of use.Its structure function and bearing capacity will decrease.Therefore, it is very important to investigate the damage and disease of the existing bridges and to strengthen the damaged bridges in time, which is of great significance to the safe operation of the bridges.In this paper, the reinforcement design and static load test of an existing reinforced concrete box arch bridge are studied systematically. Firstly, the damage of the existing bridge is inspected.According to the evaluation of inspection results and technical conditions and combined with the numerical simulation study, the reasonable reinforcement scheme was determined, the reinforcement measures were implemented, and the load test was carried out on the strengthened bridge to determine the effectiveness of the reinforcement scheme.The thesis mainly carries on the following several aspects of work: 1.Through a large number of real bridge investigation and data collection, summarized the disease, damage type of reinforced concrete bridge, and analyzed its damage mechanism, influence factors and influence on bridge structure;This paper summarizes the general reinforcement method and load capacity assessment method of reinforced concrete arch bridge, and expounds the advantages and disadvantages of each method and its application.This paper takes the strengthening project of Huangping Bridge as the research background, through the inspection of the whole appearance of the bridge, understand the disease situation of the bridge, analyze the damage factors, and carry on the comprehensive evaluation of the technical condition according to the specification.According to the evaluation conclusion, the finite element calculation model of the whole bridge is established, and various reinforcement schemes are drawn up. The advantages and disadvantages of the different schemes are analyzed and calculated. The best scheme for the bridge is selected. Finally, the reinforcement design is carried out and the reinforcement engineering is carried out.To evaluate the bearing capacity and working performance of reinforced concrete bridge after reinforcement, the internal force is calculated by using finite element software, the test section of static load test is determined, and the most unfavorable condition is selected to carry out load experiment on the bridge.The static load simulation is carried out by finite element method, and the static load measured value and the finite element simulation value are compared to evaluate the bearing capacity and working performance of the strengthened bridge in order to evaluate its strengthening effect.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.72

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