预应力混凝土空心板加固试验研究
发布时间：2018-11-25 12:00
【摘要】： 钢筋混凝土简支梁桥长期以来是我国的主导桥型,由于其设计简单,施工简便,为我国经济发展时期的常采用的形式。但是由于设计、施工、养护的原因和设计标准的改变,加之交通量的急剧增加、大型载重车辆和超载车辆的因素,在役的简支钢筋混凝土桥梁已经出现不同程度的缺陷和损伤,因此对在役桥梁的结构检测和承载力的评定与提高迫在眉睫。 本文首先对未加固的空心板相关指标以及结构理论承载能力等进行了系统的检测、计算和理论研究分析,并通过未加固的预应力混凝土空心板破坏荷载试验研究,对空心板受荷破坏机理和极限承载能力进行评定。以此为基础,分别采用受压区加大截面法和受拉区粘贴碳纤维布的方法对预应力混凝土空心板进行加固,并通过加固后的预应力混凝土空心板的破坏荷载试验研究,探讨不同结构补强措施对旧桥预应力混凝土空心板极限承载力、受荷破坏机理等的影响,并提出合理可行的旧桥预应力混凝土空心板加固补强方案及相关建议。结合有限元思想,分别采用MIDAS和ANSYS计算程序对结构进行内力计算分析,与试验结果符合比较一致,两种加固补强措施对结构承载力都有不同程度的提高,进一步论证了对于目前中小跨径桥梁,基于“单板受力”的情况采用这两种加固方法加固的实用性和可靠性,为旧桥加固施工提供了依据和理论基础。
[Abstract]:The reinforced concrete simply supported beam bridge has been the dominant bridge type in China for a long time. Because of its simple design and simple construction, it is often adopted in the period of our country's economic development. However, due to the changes in design, construction, maintenance and design standards, as well as the sharp increase in traffic volume, and the factors of large load vehicles and overloaded vehicles, the simply supported reinforced concrete bridges in service have appeared various degrees of defects and injuries. Therefore, it is urgent to evaluate and improve the structure and bearing capacity of existing bridges. In this paper, the relevant indexes of unreinforced hollow slabs and the theoretical bearing capacity of the structures are systematically tested, calculated and analyzed, and the failure load test of unreinforced prestressed concrete hollow slabs is carried out. The failure mechanism and ultimate bearing capacity of hollow slabs are evaluated. On this basis, the prestressed concrete hollow slabs are strengthened by the method of increasing the section under compression and the method of affixing carbon fiber sheets to the tensile areas, and the experimental study on the failure load of the strengthened prestressed concrete hollow slabs is carried out. This paper discusses the influence of different structural reinforcement measures on the ultimate bearing capacity and failure mechanism of prestressed concrete hollow slabs of old bridges, and puts forward some reasonable and feasible reinforcement schemes and relevant suggestions for prestressed concrete hollow slabs of old bridges. Combined with the idea of finite element method, the internal force of the structure is calculated and analyzed by MIDAS and ANSYS program, which is consistent with the test results. The two reinforcement measures can improve the bearing capacity of the structure in different degrees. This paper further demonstrates the practicability and reliability of these two reinforcement methods for small and medium span bridges based on the condition of "single slab force", which provides the basis and theoretical basis for the reinforcement of old bridges.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2007
【分类号】：U446.1
本文编号：2356024
[Abstract]:The reinforced concrete simply supported beam bridge has been the dominant bridge type in China for a long time. Because of its simple design and simple construction, it is often adopted in the period of our country's economic development. However, due to the changes in design, construction, maintenance and design standards, as well as the sharp increase in traffic volume, and the factors of large load vehicles and overloaded vehicles, the simply supported reinforced concrete bridges in service have appeared various degrees of defects and injuries. Therefore, it is urgent to evaluate and improve the structure and bearing capacity of existing bridges. In this paper, the relevant indexes of unreinforced hollow slabs and the theoretical bearing capacity of the structures are systematically tested, calculated and analyzed, and the failure load test of unreinforced prestressed concrete hollow slabs is carried out. The failure mechanism and ultimate bearing capacity of hollow slabs are evaluated. On this basis, the prestressed concrete hollow slabs are strengthened by the method of increasing the section under compression and the method of affixing carbon fiber sheets to the tensile areas, and the experimental study on the failure load of the strengthened prestressed concrete hollow slabs is carried out. This paper discusses the influence of different structural reinforcement measures on the ultimate bearing capacity and failure mechanism of prestressed concrete hollow slabs of old bridges, and puts forward some reasonable and feasible reinforcement schemes and relevant suggestions for prestressed concrete hollow slabs of old bridges. Combined with the idea of finite element method, the internal force of the structure is calculated and analyzed by MIDAS and ANSYS program, which is consistent with the test results. The two reinforcement measures can improve the bearing capacity of the structure in different degrees. This paper further demonstrates the practicability and reliability of these two reinforcement methods for small and medium span bridges based on the condition of "single slab force", which provides the basis and theoretical basis for the reinforcement of old bridges.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2007
【分类号】：U446.1
【引证文献】
相关硕士学位论文 前1条
1 颜苓;新型预应力体系加固桥梁[D];华南理工大学;2011年
，本文编号：2356024
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2356024.html
