波形钢腹板桥梁车桥耦合振动及冲击系数研究
发布时间：2018-11-14 17:12
【摘要】：波形钢腹板箱梁桥是用波形钢腹板替代混凝土腹板或平钢腹板的一种新型桥梁结构。这种新型箱梁结构有诸多优点，例如，波形钢腹板具有较高的抗剪及抗拉能力，彻底解决了混凝土腹板箱梁一直存在的腹板开裂问题；由于波形钢在纵向具有褶皱效应，使得纵向刚度几乎为零，，减少了对混凝土顶、底板的徐变、收缩约束，大大的提高了顶、底板中预应力的效应等等一些优点。国内外一些学者对这种结构进行了很多的静力方面研究，但是动力学方面一直处于滞后状态。本文对该种结构动力学方面做了一些研究，具体如下所述。 推导了并求解车桥耦合振动方程。车辆振动方程推导首先由简单到复杂，依次分别为四分之一车辆模型、二分之一二轴车辆模型、二分子一三轴车辆模型、整车三轴车辆模型。将桥梁与车辆作为两系统来考虑，对振动方程分开建立，并由桥梁和车轮间的接触点几何相容条件与力的平衡关系来进行耦合；由于直接采用桥梁的有限元几何模型时计算自由度多，工作量也增加，为了减少计算自由度，采用模态综合技术并运用Newmark法来求解方程。 桥面不平度被认为是影响车桥耦合振动的主要因素之一。本文运用谐波叠加法与国家标准GB/T703186对应的A、B、C三级路面不平度的重构，并基于数值计算软件MATLAB编制出相应的计算程序。 了解横隔板的布置及数量对波形钢腹板箱梁动力特性的影响。利用通用有限元软件ANSYS建立了五种简支箱梁模型，分别为：①无横隔板波形钢腹板箱梁；②三块跨中横隔板波形钢腹板箱梁（横隔板位置：1/4、1/2及3/4跨）；③两块端横隔板波形钢腹板箱梁；④五块横隔板波形钢腹板箱梁(横隔板位置：两块端横隔板及1/4、1/2及3/4跨）。⑤混凝土腹板箱梁。分别提取各模型前十阶振动特性进行对比分析。为了验证Ansys软件计算结果的准确性，还分别采用了Midas-Civil软件对有关算例进行了分析。 以泼和大桥为工程背景，通过ANSYS建立桥梁有限元模型，分析了车辆行驶速度、路面不平顺、桥梁阻尼对桥梁冲击系数值的影响。总结了各国规范对冲击系数的定义，得出其相应值，并且与数值解进行了对比分析。
[Abstract]:Corrugated steel web box girder bridge is a new type of bridge structure which uses corrugated steel web to replace concrete web or flat steel web. This new type of box girder structure has many advantages, for example, the corrugated steel web plate has higher shear and tensile resistance, which completely solves the web cracking problem of concrete web box girder. Because the corrugated steel has fold effect in the longitudinal direction, the longitudinal stiffness is almost zero, which reduces the creep and shrinkage constraints on the concrete roof and floor, greatly improves the roof effect and the effect of prestress in the bottom slab, and so on. Some scholars at home and abroad have done a lot of static research on this structure, but the dynamics has been lagging behind. In this paper, the dynamics of this kind of structure has been studied, as follows. The coupled vibration equation of vehicle and bridge is derived and solved. The derivation of vehicle vibration equation is from simple to complex, which are 1/4 vehicle model, two parts two axle vehicle model, two molecule one three axle vehicle model and the whole vehicle three axle vehicle model respectively. Considering the bridge and vehicle as two systems, the vibration equation is established separately and coupled by the geometric compatibility condition of the contact point between the bridge and the wheel and the balance of the force. In order to reduce the degree of freedom, the modal synthesis technique and the Newmark method are used to solve the equations in order to reduce the degree of freedom. Deck roughness is considered to be one of the main factors affecting the coupled vibration of vehicle and bridge. In this paper, the harmonic superposition method is used to reconstruct the unevenness of the third grade road surface corresponding to the national standard GB/T703186, and the corresponding calculation program is compiled based on the numerical calculation software MATLAB. To understand the influence of the layout and quantity of transverse diaphragm on the dynamic characteristics of corrugated steel web box girder. Five kinds of simply supported box girder models are established by using the general finite element software ANSYS. They are as follows: 1 box girder with no transverse diaphragm waveform steel web girder, 2 with three spans of middle transverse diaphragm steel web girder (1 / 4 / 1 / 2 and 3 / 4 span); (3) two end transverse diaphragm corrugated steel web box girders, 4 5 transverse diaphragm wave steel web box girders (transverse division board position: two end transverse divisions and 1 / 4 4 / 2 and 3 / 4 span). 5 concrete web box girders. The first ten vibration characteristics of each model were extracted for comparative analysis. In order to verify the accuracy of the calculation results of Ansys software, some examples are analyzed by using Midas-Civil software. In this paper, the finite element model of the bridge is established by ANSYS, and the influence of the vehicle speed, the road surface irregularity and the bridge damping on the impact coefficient of the bridge is analyzed. The definition of impact coefficient is summarized and the corresponding values are obtained and compared with the numerical solution.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
本文编号：2331795
[Abstract]:Corrugated steel web box girder bridge is a new type of bridge structure which uses corrugated steel web to replace concrete web or flat steel web. This new type of box girder structure has many advantages, for example, the corrugated steel web plate has higher shear and tensile resistance, which completely solves the web cracking problem of concrete web box girder. Because the corrugated steel has fold effect in the longitudinal direction, the longitudinal stiffness is almost zero, which reduces the creep and shrinkage constraints on the concrete roof and floor, greatly improves the roof effect and the effect of prestress in the bottom slab, and so on. Some scholars at home and abroad have done a lot of static research on this structure, but the dynamics has been lagging behind. In this paper, the dynamics of this kind of structure has been studied, as follows. The coupled vibration equation of vehicle and bridge is derived and solved. The derivation of vehicle vibration equation is from simple to complex, which are 1/4 vehicle model, two parts two axle vehicle model, two molecule one three axle vehicle model and the whole vehicle three axle vehicle model respectively. Considering the bridge and vehicle as two systems, the vibration equation is established separately and coupled by the geometric compatibility condition of the contact point between the bridge and the wheel and the balance of the force. In order to reduce the degree of freedom, the modal synthesis technique and the Newmark method are used to solve the equations in order to reduce the degree of freedom. Deck roughness is considered to be one of the main factors affecting the coupled vibration of vehicle and bridge. In this paper, the harmonic superposition method is used to reconstruct the unevenness of the third grade road surface corresponding to the national standard GB/T703186, and the corresponding calculation program is compiled based on the numerical calculation software MATLAB. To understand the influence of the layout and quantity of transverse diaphragm on the dynamic characteristics of corrugated steel web box girder. Five kinds of simply supported box girder models are established by using the general finite element software ANSYS. They are as follows: 1 box girder with no transverse diaphragm waveform steel web girder, 2 with three spans of middle transverse diaphragm steel web girder (1 / 4 / 1 / 2 and 3 / 4 span); (3) two end transverse diaphragm corrugated steel web box girders, 4 5 transverse diaphragm wave steel web box girders (transverse division board position: two end transverse divisions and 1 / 4 4 / 2 and 3 / 4 span). 5 concrete web box girders. The first ten vibration characteristics of each model were extracted for comparative analysis. In order to verify the accuracy of the calculation results of Ansys software, some examples are analyzed by using Midas-Civil software. In this paper, the finite element model of the bridge is established by ANSYS, and the influence of the vehicle speed, the road surface irregularity and the bridge damping on the impact coefficient of the bridge is analyzed. The definition of impact coefficient is summarized and the corresponding values are obtained and compared with the numerical solution.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
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