混合梁桥接头复合剪力连接件受力分析
[Abstract]:Composite-concrete hybrid continuous beam bridge (the middle-span section of the beam is in the form of a steel-concrete composite beam. As a new type of hybrid structure bridge, the side-span and the section of the beam extending into the middle span will be one of the important directions for the development of the bridge system because of its good mechanical properties. The prestressed concrete beam is used as the form of the prestressed concrete beam in the side-span and the middle-span. As the main force transfer member between steel and concrete, the mechanical performance of shear connector plays an important role in the overall economy, usability and durability of the bridge structure. At present, welded nail connector and PBL shear connector are the most widely used shear connectors in hybrid structure system. The mechanical properties of welded pin joints are relatively simple. Because they do not need to consider the direction of force, they are convenient to be arranged, and they have a certain anti-separation capability. It is one of the commonly used joints in early mixed structures, but when this connection mode is adopted, it is easy to be arranged. It is difficult to weld in the joint steel cell, and it is not convenient to construct when there are many welding nails. As a kind of flexible shear joint, the fatigue resistance of the welded pin is poor. PBL shear connector has strong bearing capacity and is convenient to construct compared with the welded nail. Because of its good fatigue resistance, it is widely used in hybrid beam bridges. The load transfer mainly depends on the pin action of the concrete in the circular hole on the slab, but the existence of the perforated plate also affects the integrity of the concrete filled in the joint. Based on the background of a three-span composite-concrete hybrid continuous beam bridge, based on the advantages and disadvantages of the welded stud and the PBL shear connector, a new type of connection-composite shear connector is designed in this paper. That is, the welded nail connector and the PBL shear connector are used in the steel beam webs of the joint, and the welded nail connectors are adopted respectively by using the general finite element analysis software ANSYS. The local model of the composite-concrete hybrid continuous beam bridge of PBL shear connector and composite shear connector is simulated and analyzed. The results show that the load of the three joints does not exceed their ultimate bearing capacity and can be used safely under the design load. Compared with PBL shear connector, the joint of welded nail connector and composite shear connector is used to fill the concrete with smooth stress transition, and the stress is the best. Along the lateral side of the bridge, the shear force distribution of the welded stud connector is more uniform, and the stress distribution of the composite shear connector is very uneven. In addition, the shear distribution of composite shear connector is not uniform, and the shear value of PBL shear connector with larger stiffness is larger than that of welded nail connector with smaller stiffness, and the farther away from the bearing plate, the greater the shear value is borne by the same type of connector. The PBL shear connectors on the web bear about 70% of the shear force, while the welded studs bear about 30% of the shear values.
【学位授予单位】:吉林建筑大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:U441
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