钢筋混凝土损伤桥梁的加固及承载能力评定

发布时间：2018-04-09 19:21

本文选题：钢筋混凝土桥梁　切入点：损伤　出处：《太原理工大学》2014年硕士论文

【摘要】：桥梁受外界荷载等因素影响,在使用过程中会受到不同程度的损伤,其承载力和结构功能均会下降。加之近年来,交通量飞速增长,车辆重型化日趋严重,很多既有桥梁已经无法满足其使用要求,有些甚至面临坍塌的危险。因此,损伤桥梁的加固及加固效果的检测显得尤其重要,对桥梁的安全运营具有重要意义。本文对某既有钢筋混凝土损伤桥梁的加固进行了系统研究。首先对其损伤情况进行检查,根据检查结果和损伤评定确定加固方案,实施加固措施；然后对加固后的桥梁进行荷载试验包括承载能力和动力性能两方面的检测,确定加固方案的有效性。主要开展了如下工作： 1、归纳总结损伤类型和加固方法。归纳钢筋混凝土桥梁的损伤类型,并分析损伤机理和影响因素以及对桥梁结构的影响；总结钢筋混凝土桥梁的一般加固方法,阐述各个加固方法的优缺点和适用情况。 2、对该钢筋混凝土桥梁进行损伤检查。该钢筋混凝土桥梁为四孔一联的钢筋混凝土连续桥,通过对该桥进行上部结构、下部结构和路基边坡的整体外观检查,采用规范规定的评定标准对桥梁进行综合评定。以评定结论和专家意见设计加固标准,并确定加固方案,根据计算标准,通过理论计算初步验证加固方案的可行性。 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。本文首先利用MIDAS/CIVIL软件建立初始模型进行内力计算,确定静载试验的测试截面；其次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,通过比较静载实测值和模拟值,对加固后桥梁的承载能力和工作性能进行评定,确定加固效果显著。 4、对加固后的钢筋混凝土桥梁进行动力分析。通过对该加固后桥梁进行动载试验(包括跑车和刹车的激振试验),测试桥梁的结构频率,计算其阻尼比,分析其动力性能,验证加固方法的有效性。同时采用有限元软件ANSYS进行跑车试验模拟,进一步测定桥梁的动力特性并验证加固效果显著,为今后桥梁评定提供依据。
[Abstract]:Under the influence of external load and other factors, the bridge will be damaged in different degree, and its bearing capacity and structure function will decrease.In addition, in recent years, with the rapid growth of traffic volume, heavy vehicles are becoming more and more serious. Many existing bridges have been unable to meet the requirements of their use, and some even face the danger of collapse.Therefore, the reinforcement of damaged bridges and the detection of reinforcement effect are particularly important, which is of great significance to the safe operation of bridges.In this paper, the reinforcement of an existing reinforced concrete damaged bridge is systematically studied.First of all, the damage of the bridge is inspected, the reinforcement scheme is determined according to the results of the inspection and the damage evaluation, and the reinforcement measures are carried out. Then, the load test of the strengthened bridge includes the load bearing capacity and the dynamic performance of the strengthened bridge.Determine the effectiveness of the reinforcement program.The main tasks were as follows:1. Summarize the damage types and reinforcement methods.The damage types of reinforced concrete bridges are summarized, and the damage mechanism and influencing factors are analyzed. The general reinforcement methods of reinforced concrete bridges are summarized, and the advantages and disadvantages of each reinforcement method and its application are expounded.2. The damage of the reinforced concrete bridge is checked.The reinforced concrete bridge is a continuous reinforced concrete bridge with four holes. By checking the whole appearance of the superstructure, substructure and subgrade slope of the bridge, the comprehensive evaluation of the bridge is carried out according to the evaluation standard stipulated in the code.According to the evaluation conclusion and expert opinion, the reinforcement standard is designed, and the reinforcement scheme is determined. According to the calculation standard, the feasibility of the reinforcement scheme is preliminarily verified by theoretical calculation.3. Evaluate the bearing capacity and working performance of reinforced concrete bridge after reinforcement.In this paper, the initial model is established by MIDAS/CIVIL software to calculate the internal force, and the test section of the static load test is determined. Secondly, the load experiment of the bridge is carried out under the most unfavorable working conditions, and the static load simulation is carried out by the finite element method.By comparing the measured values of static load with the simulated values, the bearing capacity and working performance of the strengthened bridge are evaluated, and it is determined that the reinforcement effect is remarkable.4. Dynamic analysis of reinforced concrete bridge after reinforcement.Through the dynamic load test (including the exciting test of sports car and brake), the structure frequency of the strengthened bridge is tested, its damping ratio is calculated, its dynamic performance is analyzed, and the effectiveness of the reinforcement method is verified.At the same time, the finite element software ANSYS is used to simulate the sports car test, to further determine the dynamic characteristics of the bridge and to verify the remarkable reinforcement effect, which provides the basis for the evaluation of the bridge in the future.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U445.72

【参考文献】