预制空心板体系梁桥受力性能试验研究

发布时间：2018-06-03 14:39

本文选题：空心板梁桥 + 铰缝　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：预制空心板体系梁桥在我国交通行业中发展中有着举足轻重的地位，尤其对于中小跨径桥梁，预制空心板的结构形式的应用是最为普遍的。它具有预制简单、施工方便、适应性强等诸多优点，承载着疏通公路、跨越沟壑的重任。然而，自预制空心板体系梁桥问世以来，困扰其发展的最大问题就是不断产生而又难以克服的病害问题。虽然诸多学者已经对空心板体系梁桥的特性进行了数十年的研究，空心板梁桥也在随着技术的发展而不断进化升级，但是仍然不能完全避免病害的发生。因此，深入的研究预制空心板梁桥受力性能，探讨病害产生根本原因，提出针对这种特殊结构形式的改进方法，具有很重要的工程实践意义。为此，本文通过试验和理论两个角度对空心板梁桥的受力性能进行如下分析：首先研究了空心板梁桥的受力特点，着重分析了荷载横向分布思想的基本原理和存在的问题，分别探讨了空心板主梁和铰缝各自的受力特点。研究了空心板梁桥现行设计方法的特点，找到了空心板梁桥设计中存在的问题和引起的误差。以吉林省白山市抚松互通立交省道302改道工程设计标段内的K0+638.5小桥的全尺寸模型试验为基础，利用试验测得的结果探究了空心板体系梁桥在荷载作用下荷载横向分布规律、铰缝内应力的变化规律以及桥梁破坏后裂缝的分布和发展规律。对全尺寸模型破坏试验中空心板梁桥的破坏过程和破坏机理进行了研究。利用有限元分析软件ANSYS建立了空心板全尺寸试验的有限元模型，从荷载横向分布、主梁挠度以及铰缝应力三个角度对比了模型计算结果与试验分析结果的内在联系和主要区别，发现了现行设计方法存在一定的保守性。综合了有限元与全尺寸模型试验分析结果，提出了针对空心板梁桥的三点改进建议，，即纵向拱形钢筋的构造形式、铰缝分层浇筑的施工方法以及新型的铰缝构造形式和横向抗弯钢筋构造形式。本文最大的成果就是用两种不同的方法分析了空心板梁桥整体结构从弹性工作阶段一直到破坏阶段的受力性能，为以后预制空心板体系的发展和研究提供了充分的理论依据和试验参考。
[Abstract]:Precast hollow slab girder bridges play an important role in the development of China's transportation industry, especially for small and medium-sized span bridges, the application of prefabricated hollow slab structure is the most common. It has many advantages, such as simple prefabrication, convenient construction, strong adaptability and so on. It carries the heavy task of dredging the highway and crossing the gully. However, since the advent of the precast hollow slab system beam bridge, the biggest problem puzzling the development of the bridge is the disease which is constantly produced and difficult to overcome. Although many scholars have studied the characteristics of hollow slab beam bridge for decades, and the hollow slab beam bridge is evolving and upgrading with the development of technology, it can not completely avoid the occurrence of disease. Therefore, it is of great significance in engineering practice to study the mechanical performance of prefabricated hollow slab girder bridge, to discuss the root cause of the disease, and to propose an improved method for this special structural form. Therefore, the mechanical behavior of hollow slab girder bridge is analyzed as follows: Firstly, the stress characteristics of hollow slab girder bridge are studied, the basic principle and existing problems of transverse load distribution are analyzed, and the stress characteristics of the main beam and hinge joint of hollow slab are discussed respectively. The characteristics of the current design method of hollow slab girder bridge are studied, and the problems and errors in the design of hollow slab girder bridge are found. Based on the full-scale model test of the K0 638.5 small bridge in the design section of Fusong Interchange Provincial Highway 302 in Baishan City, Jilin Province, the transverse distribution of the load on the hollow slab system girder bridge under load is investigated by using the test results. The variation of stress in hinge joints and the distribution and development of cracks after bridge failure. The failure process and failure mechanism of hollow slab girder bridge in full-scale model failure test are studied. The finite element model of full scale test of hollow slab is established by using finite element analysis software ANSYS. The internal relations and main differences between the results of model calculation and test analysis are compared from three angles of transverse distribution of load, deflection of main beam and stress of hinge joint. It is found that the current design method is conservative to some extent. Based on the results of finite element and full-scale model tests, three improvement suggestions for hollow slab girder bridges are put forward, that is, the structural form of longitudinal arch steel bars. The construction method and new type of hinge joint construction and transverse flexural steel bar construction are discussed in this paper. The greatest achievement of this paper is to analyze the mechanical behavior of the whole structure of hollow slab girder bridge from the elastic working stage to the failure stage by using two different methods. It provides sufficient theoretical basis and experimental reference for the development and research of precast hollow slab system.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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