体外预应力节段拼装轻型薄壁箱梁的荷载试验与有限元分析

发布时间：2018-04-22 23:16

本文选题：体外预应力 + 数值计算　；参考：《安徽理工大学》2015年硕士论文

【摘要】：与体内预应力是将预应力钢筋布置在混凝土结构内部相比,体外预应力将预应力钢筋安装在体外,对于它的锚固可以用混凝土浇筑锚固端进行锚固,钢筋的偏转可以在需要偏转的部位浇筑转向块使其偏转。芜湖长江公路二桥采用体外预应力技术与节段预制拼装箱梁,不仅能够节约混凝土用量,取得较好的经济效益,还能控制节段的施工质量,提高结构的耐久性,取得较好的质量保证。本文主要结合现场实际介绍了箱梁的荷载试验,总结了荷载试验的基本原则与基本过程,从荷载试验的分类,荷载试验的目的,荷载试验的准备工作等。通过ANSYS主要对预应力箱梁桥,在张拉预应力,自重荷载,车辆荷载工况下,进行了非线性有限元分析,然后从结构变形方面,混凝土开裂方面,混凝土受压屈服方面,进行了系统的定量的分析和比较。ANSYS建模过程过程中遇到的各种问题及解决和改进方案可以为今后箱梁施工及设计提供一些参考数据。
[Abstract]:Compared with the internal prestress, the prestressed steel bar is installed in the outside of the concrete structure, and the anchoring can be carried out with the anchoring end of the concrete. The deflection of the reinforcing bar can be made by pouring the steering block where it needs to be deflected. The second bridge of Wuhu Yangtze River Highway adopts the technology of external prestressing and precast box girder, which can not only save the amount of concrete, obtain better economic benefit, but also control the construction quality of section and improve the durability of structure. Obtain better quality assurance. This paper mainly introduces the load test of box girder, summarizes the basic principle and process of load test, from the classification of load test, the purpose of load test, the preparation work of load test, etc. Through ANSYS, the nonlinear finite element analysis of prestressed box girder bridge is carried out under the condition of tensioning prestress, deadweight load and vehicle load, and then from the aspects of structural deformation, concrete cracking and concrete compression yield, the nonlinear finite element analysis is carried out. The problems encountered in the process of modeling by ANSYS and the solutions and improvement schemes can provide some reference data for the construction and design of box girder in the future.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446.1

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