独柱墩弯梁桥抗倾覆稳定性及典型车辆过桥单车最大荷载研究

发布时间：2018-06-01 04:28

本文选题：独柱墩连续弯梁桥 + 倾覆破坏　；参考：《长安大学》2014年硕士论文

【摘要】：曲线梁桥是实现交通汇流分流的重要结构，近年来我国交通运输的发展和我国城市化进程的迅速进行，独柱墩连续弯梁桥得到大力发展，在高速公路的互通式立交和城市交叉口的立交匝道桥都得到广泛应用。由于独柱墩连续弯梁桥自身构造特点，桥台的内外侧支座的反力分布可能不均匀，易引发出现支座脱空的现象。以往发生了多起连续弯梁桥倾覆性破坏事故。桥梁工程作为民生工程，因此有必要对独柱墩弯梁桥的抗倾覆性能进行深入研究，特别得对超载车辆作用下结构的安全性能有必要进行细致的探究。本文将要进行的研究内容是拟在弯桥分析理论的基础上，基于梁格法建立独柱墩连续弯梁桥有限元模型，分别建立相同跨径跨数时不同曲率半径、相同曲率半径时不同跨数桥梁的有限元模型，分析并找出梁端内侧恒载支座反力的变化规律，研究并归纳出支座合理偏心距的确定方法，同时对交通流中典型超载车辆过桥时单车最大荷载确定方法进行探究。主要拟研究内容如下： (1)分析并找出梁端内、外侧恒载支座反力的变化规律，以及合理支座偏心距的取值方法，即跨数较大、半径较大的弯梁桥，对支座偏心比较敏感，需要相对小的支座偏心距，而跨数小、半径小的弯梁桥，，对支座偏心不敏感，需要相对大的支座偏心距。 (2)分析并找出各工况在城市A级车道荷载及车辆荷载作用下支座反力变化规律。 (3)研究结构在不同活荷载工况下抗倾覆稳定系数，找出并比较不同结构抗倾覆稳定系数变化规律，即相对而言，跨数多、半径小的弯梁桥抗倾覆能力大于跨数少、半径大的弯梁桥。 (4)选择交通流典型超载车辆进行最不利布载，分别研究和确定在承载能力极限状态和正常使用极限状态下典型车辆过桥单车最大荷载，给今后的桥梁设计工作提供有益的参考。
[Abstract]:The curved beam bridge is an important structure to realize the diversion of traffic flow . In recent years , the development of transportation in China and the rapid progress of urbanization in China have been widely applied . Due to the structural characteristics of the continuous curved beam bridge of single - column pier , the reverse force distribution of the inner and outer supports of the abutment may not be uniform , and it is easy to initiate the phenomenon of collapse of the support . As a result , it is necessary to study the anti - overturning performance of the single - column pier curved beam bridge , and it is necessary to study the safety performance of the structure under the action of overload vehicles .

Based on the analysis theory of curved bridge , the finite element model of the continuous curved beam bridge of single column pier is built on the basis of beam - lattice method . The finite element model of different span bridges with different radius of curvature and the same radius of curvature is established . The method of determining the reasonable eccentricity of the bearing is analyzed and summarized . At the same time , the method of determining the maximum load of the single vehicle is studied in the traffic flow . The main research contents are as follows :

( 1 ) Analysis and find out the changing law of the reaction force of the inner and outer constant - load bearing of the beam , and the value of reasonable support eccentricity , that is , the bending beam bridge with large span and large radius , which is sensitive to the eccentricity of the support , needs a relatively small support eccentricity , and the span of the curved beam bridge with small span and small radius is not sensitive to the eccentricity of the support , and a relatively large offset distance of the support is required .

( 2 ) Analysis and find out the change rule of the support reaction force under the load of Class A lane and the load of vehicle under the action of vehicle load .

( 3 ) To study the anti - overturning stability coefficient of the structure under different live load conditions , and find out and compare the variation law of anti - overturning stability coefficient of different structures , that is , the bending beam bridge with small span and small radius is larger than the span and large radius curved beam bridge .

( 4 ) Select traffic flow typical overload vehicle to carry on the most unfavorable load , respectively study and determine the maximum load of typical vehicle bridge single vehicle under the limit state of carrying capacity and normal use limit state , and provide beneficial reference for future bridge design work .
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.2

【共引文献】