汽车荷载对桥梁不同截面的冲击效应分析
发布时间：2019-01-07 12:24
【摘要】：随着我国桥梁事业的迅速发展,车流量、行车速度和载荷的提高,决定了需要不断提高桥梁结构的设计要求,而冲击效应作为一个主要的指标来评价桥梁结构的行车性能和桥面平整度,越来越受到研究者的关注。我国04规范中规定了冲击系数的规范计算方法,特别说明了连续梁桥支点负弯矩截面的冲击系数计算不应用基频进行计算,基于规范这一说明,本文通过收集的常规连续梁桥和拱桥试验样本,根据数值计算模拟和试验样本统计分析的方法,分别对连续梁桥边跨最大正弯矩截面及中支点负弯矩截面、拱桥的L/4截面及跨中截面的冲击系数或应变增大系数及结构频率进行统计分析,拟合并分析上述测试截面的冲击系数或应变增大系数与结构频率间的数学模型关系曲线,得出两者间较合适的关系曲线,并按照冲击效应规范取值的意义和95%的保证率进行修正得到估算公式。利用ABAQUS有限元软件分别建立平昌县星光工业园区基础建设工程2×30m预应力混凝土小箱梁桥和巴河大桥的分析模型,分析得出两桥的自振频率理论值并将其与实测值进行对比分析,同时结合静载试验分别验证上述两座桥梁的实际刚度;根据试验车速分别对两桥施加试验车辆荷载建立车桥耦合模型,计算得到不同车速下两桥测试截面的理论冲击系数或应变增大系数,并分别按照车速将理论计算值、实测值、规范取值及估算公式取值进行对比分析,分别验证上述桥梁估算公式的合理性并评价其结构的安全性能。
[Abstract]:With the rapid development of bridge industry in China, the increasing of traffic flow, driving speed and load determines the need to continuously improve the design requirements of bridge structure. The impact effect, as a main index to evaluate the driving performance and deck smoothness of bridge structure, has been paid more and more attention by researchers. The calculation method of impact coefficient is specified in Code 04 of our country. It is especially explained that the calculation of impact coefficient of negative moment section at fulcrum of continuous beam bridge is not calculated by fundamental frequency, based on this specification, According to the method of numerical simulation and statistical analysis of test samples of conventional continuous beam bridges and arch bridges, the maximum positive moment section and the negative moment section of the middle fulcrum of the bridge side of the continuous beam bridge are respectively studied in this paper. The impact coefficient or strain increase coefficient and structural frequency of the L- / 4 section and the mid-span section of the arch bridge are statistically analyzed, and the mathematical model curves between the impact coefficient or strain increase coefficient of the above test section and the frequency of the structure are analyzed together. A more suitable relationship curve between the two is obtained, and the estimation formula is obtained according to the significance of the criterion of impact effect and the 95% guarantee rate. The analysis models of the 2 脳 30m prestressed concrete small box girder bridge and the Bahe Bridge are established by using the ABAQUS finite element software, respectively. The theoretical values of the natural vibration frequencies of the two bridges are obtained and compared with the measured values. At the same time, the actual stiffness of the above two bridges is verified by static load test. The vehicle-bridge coupling model is established according to the vehicle load applied to the two bridges by the test speed, and the theoretical impact coefficient or strain increase coefficient of the two bridge test sections under different speeds are calculated, and the theoretical values are calculated according to the speed of the two bridges, and the measured values are measured. The rationality of the bridge estimation formula is verified and the safety performance of the bridge structure is evaluated by comparing and analyzing the standard values and the estimation formula values.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.2
本文编号：2403662
[Abstract]:With the rapid development of bridge industry in China, the increasing of traffic flow, driving speed and load determines the need to continuously improve the design requirements of bridge structure. The impact effect, as a main index to evaluate the driving performance and deck smoothness of bridge structure, has been paid more and more attention by researchers. The calculation method of impact coefficient is specified in Code 04 of our country. It is especially explained that the calculation of impact coefficient of negative moment section at fulcrum of continuous beam bridge is not calculated by fundamental frequency, based on this specification, According to the method of numerical simulation and statistical analysis of test samples of conventional continuous beam bridges and arch bridges, the maximum positive moment section and the negative moment section of the middle fulcrum of the bridge side of the continuous beam bridge are respectively studied in this paper. The impact coefficient or strain increase coefficient and structural frequency of the L- / 4 section and the mid-span section of the arch bridge are statistically analyzed, and the mathematical model curves between the impact coefficient or strain increase coefficient of the above test section and the frequency of the structure are analyzed together. A more suitable relationship curve between the two is obtained, and the estimation formula is obtained according to the significance of the criterion of impact effect and the 95% guarantee rate. The analysis models of the 2 脳 30m prestressed concrete small box girder bridge and the Bahe Bridge are established by using the ABAQUS finite element software, respectively. The theoretical values of the natural vibration frequencies of the two bridges are obtained and compared with the measured values. At the same time, the actual stiffness of the above two bridges is verified by static load test. The vehicle-bridge coupling model is established according to the vehicle load applied to the two bridges by the test speed, and the theoretical impact coefficient or strain increase coefficient of the two bridge test sections under different speeds are calculated, and the theoretical values are calculated according to the speed of the two bridges, and the measured values are measured. The rationality of the bridge estimation formula is verified and the safety performance of the bridge structure is evaluated by comparing and analyzing the standard values and the estimation formula values.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.2
【参考文献】
相关期刊论文 前4条
1 姜维成;于立新;;基于阻尼对连续梁桥冲击系数影响的研究[J];吉林建筑工程学院学报;2007年03期
2 王少钦,岳祖润,马殠;车辆对桥梁动力作用简化方法的研究[J];石家庄铁道学院学报;2005年03期
3 谭国辉;桥梁与车辆相互作用的系统模拟[J];土木工程学报;1996年03期
4 宋一凡,贺拴海;公路桥梁冲击系数的影响因素分析[J];西安公路交通大学学报;2001年02期
相关硕士学位论文 前1条
1 赵剑;梁式桥汽车冲击振动研究与分析[D];重庆交通大学;2009年
，本文编号：2403662
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