| Nowadays,the state vigorously promotes green and environmental protection building technology.Therefore,prefabricated building technology appeared along with the people’s attention.Compare with the previous construction techniques,the technology of prefabricated construction can effectively shorten the construction period and improve the efficiency of construction.And it is a part of the new construction industry.For prefabricated building structures,the quality of prefabricated components can be guaranteed,however these prefabricated components need to be fitted together at the site,so the joints are important for the whole building.Therefore the thesis studied the connection mode of beam-column joint of prefabricated frame structure,and improved a dry-type joint with bolt connection.And the thesis studied the mechanical properties of the improved joint by using finite element software.(1)This thesis introduced a new beam-column joint,and the joint are mainly connected by H-beam and Angle steel.The H-beam is embedded in the prefabricated column as the main stress member.The thesis carried out the stress analysis of each connecting member of the node and gave the bearing capacity formula for the connecting members.(2)In this thesis the size and the steel of the joint are designed by combing a practical project.Through the ABAQUS software,the author established three kinds of node model.The three models include a improved-joint,a concrete bolt-connected joint and a cast-inplace joint.Compared the failure modes,stress distribution,energy dissipation,bearing capacity and ductility of the three nodes,this result indicated that the improved joint having the highest bearing capacity,which is increased by 51.8%.In terms of the energy consumption and the ductility,the performance of concrete bolt-connection joint was the worst,other two types of nodes is similar.Compared the failure modes,the improved assembly nodes show better safety and reliability.(3)This thesis studied the influence of different factors on the performance of the improved joint,using numerical simulation to study the influence of the change of axial compression ratio,angle steel ribbed,h-beam length,h-beam section height and concrete strength on the performance of the joint.The finding suggested that the joint showed good performance when the axial compression ratio is between 0.55 to 0.6.Improving the grade of precast concrete strength and change the structure of angle steel can improve the bearing capacity of joints.The overhang length and height of H-beam should be controlled within a certain range.When the overhang length of H-beam is 250 mm and the height is 200 mm,the joint performance is the best. |
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