体外预应力加固空心板桥的非线性分析

发布时间：2018-01-08 12:17

本文关键词：体外预应力加固空心板桥的非线性分析　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着交通量的增大和车辆超载问题的日益严重,出现越来越多的桥梁病害问题,造成桥梁承载力下降,对我国经济的发展和人民的生命和财产造成威胁。桥梁病害是不可避免的,因此桥梁的维修加固是桥梁建设工程中最关键的部分之一。工程中常用的桥梁的维修加固方法有体外预应力加固法。体外预应力加固法不仅可以用于旧桥的维修改造和加固,还适合于新建工程,具有不影响交通、拉索布置灵活且可以调换、方便检修、耐久性好等优点。国内外的专家学者已经对体外预应力加固结构体系进行了深入的研究,但目前并没有关于折线形和直线型相结合的体外预应力加固空心板桥的研究。本文中结合空心板桥的破坏试验,采用有限元软件ABAQUS对体外预应力加固空心板桥进行模拟分析,研究体外预应力加固空心板桥在外部荷载作用过程中的受力状态,以及不同的转向块高度和锚固位置对体外预应力加固效果的影响。通过对既有T梁试验进行有限元建模分析,验证了采用混凝土弥散裂缝模型是可靠的。考虑了体外预应力加固T梁中体外预应力筋的布置形状、锚固位置和转向块的数量等因素对体外预应力加固技术效果的影响。本文还研究了不同高度的转向块和不同的锚固位置对加固单块空心板效果的影响,得出合理的转向块高度和锚固位置。利用有限元软件ABAQUS,结合东孟姜女桥破坏试验对空心板桥进行非线性的模拟分析,模拟空心板桥在外部荷载下的受力状态和采用体外预应力加固之后的受力状态。通过对加固前后的模拟结果进行对比分析,得到空心板梁的荷载挠度曲线和应力曲线,证明体外预应力加固法可以明显降低桥梁的变形,提高桥梁的承载力。
[Abstract]:With the increasing traffic and the overloading of vehicles is becoming more and more serious, more and more problems appear bridge disease, caused by the fall of bearing capacity of the bridge, a threat to China's economic development and people's lives and property. The bridge is inevitable, so the bridge maintenance and reinforcement is one of the most important part of the bridge construction. The bridge commonly used in engineering maintenance and reinforcement method of external prestressing reinforcement method. External prestressing method can be used not only for the maintenance and reinforcement of old bridge, also suitable for new construction, does not affect the traffic, the layout of cables and flexible exchange, convenient maintenance, durability and good. Domestic and foreign experts and scholars have to external prestressing structure system is studied, but there is no hollow slab bridge external prestressing reinforcement of broken line and linear combination. The failure test of hollow slab bridge in this paper, using the finite element software ABAQUS of externally prestressed reinforced hollow slab bridge simulation analysis of external prestressed reinforcement hollow slab in external load in the process of stress state and different steering block height and the reinforcement effect of externally prestressed anchor position. Based on the existing T beam test analysis of finite element modeling, verified using the smeared crack model of concrete is reliable. Considering the layout form of external prestressed tendons in T beams strengthened with external prestressing, affect the anchor position and turn to the number of blocks and other factors on the external prestressing effect. Effect of steering block and different position of the reinforcement anchorage the effect of single hollow slab is studied with different height, block height and that the steering anchor position reasonable. Using the finite element software ABAQUS. Meng Jiangnu East Bridge failure simulation test analysis on nonlinear simulation of hollow slab, hollow slab in external load state and after strengthened by external prestressing force. Through the analysis and comparison of the simulation results of before and after reinforcement, get the load deflection curve of hollow slab beam and the stress curve that external prestressing the strengthening method can significantly reduce the bridge deformation, improve the bearing capacity of bridges.

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.72

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