基于荷载试验的简支空心板梁桥影响因素敏感性分析
发布时间：2019-05-07 11:09
【摘要】：随着我国桥梁工程技术的发展,桥梁荷载试验技术和理论水平不断发展完善,桥梁荷载试验结果和实际状况之间的相关程度一直是桥梁荷载试验追求的目标。鉴于桥梁实际结构的复杂性,荷载试验实测值和理论计算值之间存在显著差异,荷载试验校验系数一般都小于理想值1,其间的影响因素是多方面的,在结果分析评定时,不宜单独考虑某一个参数的影响,在影响因素综合考虑方面还需要进一步的研究。论文选取20米空心板梁桥,设计了荷载试验方案,利用试验车辆进行中载和偏载试验,得到了荷载的横向分布、应变、挠度的实测值。基于正交法设计了三因素三水平正交表,综合考虑桥面铺装、护栏、混凝土弹性模量变化对荷载试验结果的影响,得到9个不同水平组合的理论计算工况。分别计算这些理论计算工况下各主梁的截面特性,利用桥梁计算程序,对实桥进行建模和试验车辆模拟加载,计算不同水平组合下的荷载横向分布系数、应变、挠度的理论值,并与实验值进行对比。最后通过正交数值计算分析三个影响因素的主次顺序和最不利水平组合。论文研究成果能够对荷载试验分析评定、工程设计和结构加固提供一定的参考,对推动桥梁荷载试验技术的发展具有一定意义。
[Abstract]:With the development of bridge engineering technology in China, the bridge load test technology and theoretical level continue to develop and perfect. The correlation between the bridge load test results and the actual situation has always been the goal of bridge load test. In view of the complexity of the actual bridge structure, there is a significant difference between the measured value of the load test and the calculated value of the theory. The calibration coefficient of the load test is generally less than the ideal value of 1, and the influencing factors are various. When the results are analyzed and evaluated, the results are analyzed and evaluated. It is not suitable to consider the influence of a certain parameter alone, and further study is needed in the comprehensive consideration of the influence factors. In this paper, a 20-meter hollow slab girder bridge is selected to design a load test scheme. The load distribution, strain and deflection of the bridge are measured by using the test vehicle in mid-load and off-load tests. Based on the orthogonal method, a three-factor three-level orthogonal table is designed. Considering the influence of bridge deck pavement, guardrail and concrete elastic modulus on the load test results, nine theoretical calculation conditions of different level combinations are obtained by considering the influence of bridge deck pavement, guardrail and concrete elastic modulus on the load test results. The cross-section characteristics of the main beams under the conditions of these theoretical calculations are calculated respectively. By using the bridge calculation program, the real bridges are modeled and tested by vehicle simulation, and the theoretical values of the transverse distribution coefficient, strain and deflection of the loads under different horizontal combinations are calculated, and the theoretical values of the load transverse distribution coefficient, strain and deflection are calculated. The results were compared with the experimental data. Finally, the order of primary and secondary factors and the most unfavorable level combination of the three factors are analyzed by orthogonal numerical calculation. The research results can provide some reference for load test analysis and evaluation, engineering design and structural strengthening, and have certain significance for promoting the development of bridge load test technology.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;U448.21
本文编号：2471028
[Abstract]:With the development of bridge engineering technology in China, the bridge load test technology and theoretical level continue to develop and perfect. The correlation between the bridge load test results and the actual situation has always been the goal of bridge load test. In view of the complexity of the actual bridge structure, there is a significant difference between the measured value of the load test and the calculated value of the theory. The calibration coefficient of the load test is generally less than the ideal value of 1, and the influencing factors are various. When the results are analyzed and evaluated, the results are analyzed and evaluated. It is not suitable to consider the influence of a certain parameter alone, and further study is needed in the comprehensive consideration of the influence factors. In this paper, a 20-meter hollow slab girder bridge is selected to design a load test scheme. The load distribution, strain and deflection of the bridge are measured by using the test vehicle in mid-load and off-load tests. Based on the orthogonal method, a three-factor three-level orthogonal table is designed. Considering the influence of bridge deck pavement, guardrail and concrete elastic modulus on the load test results, nine theoretical calculation conditions of different level combinations are obtained by considering the influence of bridge deck pavement, guardrail and concrete elastic modulus on the load test results. The cross-section characteristics of the main beams under the conditions of these theoretical calculations are calculated respectively. By using the bridge calculation program, the real bridges are modeled and tested by vehicle simulation, and the theoretical values of the transverse distribution coefficient, strain and deflection of the loads under different horizontal combinations are calculated, and the theoretical values of the load transverse distribution coefficient, strain and deflection are calculated. The results were compared with the experimental data. Finally, the order of primary and secondary factors and the most unfavorable level combination of the three factors are analyzed by orthogonal numerical calculation. The research results can provide some reference for load test analysis and evaluation, engineering design and structural strengthening, and have certain significance for promoting the development of bridge load test technology.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;U448.21
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相关期刊论文 前1条
1 潘松林,张红阳;公路桥梁检测概述[J];城市道桥与防洪;2003年05期
相关硕士学位论文 前1条
1 刘利军;梁桥静载试验结果评定分析[D];长安大学;2011年
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