某混凝土桥梁安全检测及研究

发布时间：2018-01-15 14:03

本文关键词：某混凝土桥梁安全检测及研究　出处：《广州大学》2015年硕士论文　论文类型：学位论文

【摘要】：本论文以某混凝土桥梁检测为工程背景,主要对其做基本检测与荷载试验。通过对比分析该桥结构的检测试验数据与有限元计算结果,结合桥梁相关规范的要求,判断该混凝土桥整体安全性工作能力。主要内容有:(1)介绍了桥梁外观缺陷检测、混凝土强度检测和混凝土中钢筋保护层检测等无损检测方法,对某混凝土桥进行检测。(2)采用Midas/civil通用有限元分析软件建立某混凝土桥模型,在城-A级设计荷载作用下,计算不同内力分布结果,其中跨中处最大挠度变形为4.47mm和最大正弯矩为1.01×104kN·m;经过Lancsos子空间迭代法计算出该桥模型的前5阶振型,得到前5阶自振频率和自振周期,该桥模型的基频为2.9025Hz,计算冲击系数为0.173。(3)在某混凝土桥结构上进行静载试验,采集桥梁控制截面处正载和偏载加载工况作用的应变和挠度变形值,把静载工况下的试验值和模型计算值作对比。工况1下应变的平均校验系数是0.82,挠度的平均校验系数是0.64。工况2下应变的平均校验系数是0.66,挠度的平均校验系数是0.62。(4)某混凝土桥进行脉动试验、跑车试验和跳车试验,采集其动力响应参量,分别作固有频率、冲击系数和阻尼比测试值与计算值对比分析。其中测得的最大冲击系数是1.079小于计算值1.173且平均冲击系数1.066占计算值的90.9%,阻尼比为0.0358。
[Abstract]:The detection of a concrete bridge as the engineering background, mainly to do the basic detection and load test. Through the comparison and analysis of test data and finite element calculation results of the bridge structure of the bridge, according to the relevant standard requirements, determine the overall safety of the working capacity of the concrete bridge. The main contents are as follows: (1) the detection the bridge appearance defects, concrete strength testing and reinforced concrete protective layer detection and nondestructive detection method, detection of a concrete bridge. (2) the establishment of a concrete bridge model using finite element analysis software Midas/civil, in the city - a design load, the internal force distribution of different calculation results, the maximum deflection of midspan the deformation is 4.47mm and the maximum positive moment is 1.01 * 104kN m; after Lancsos subspace iterative method to calculate the bridge model with 5 modes, the first 5 natural frequencies and vibration period, the The fundamental frequency of bridge model is 2.9025Hz, the calculation of impact coefficient of 0.173. (3) static load test in a concrete bridge structure, strain and deflection control section to acquire bridge load and bias load conditions of the deformation, the value calculated static load test under the condition of 0.82 is the average value and model. Check the status of the 1 strain coefficient, the average coefficient of deflection is 0.64. the average coefficient under the 2 conditions of the strain is 0.66, 0.62. is the average coefficient of deflection (4) of a concrete bridge fluctuation test, running test and jumping test, collecting the dynamic response parameters are natural frequency, impact coefficient and the damping value compared with the calculated value than the test. One of the biggest impact coefficient measured is 1.079 less than the calculated value of 1.173 and the average impact coefficient to calculate the value of 1.066 accounted for 90.9%, the damping ratio is 0.0358.

【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

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