| Reinforced Concrete encased Steel Truss Structure is one type of SRC structure that consists of reinforced concrete and steel,which steel is the main skeleton and angle cross is placed to the end of beam truss so that it gives good performance to Energy consumption.This paper put forward the Reinforced Concrete encased steel truss beam-SRC Column inner joint, and took T shape steel instead of traditional Angle as force frame beam, which avoided the weakness of Angle instability, and connected with solid-web steel reinforced concrete columns to form the new joints.Considering Three parameters, this paper designed eight shear destruction inner joints, and low reversed cyclic loading tests were carried out to study the joints ductility performance, hysteretic properties and other seismic energy dissipation performance, the main work and achievements are as follows:(1)In order to study the seismic behaviors of Reinforced Concrete encased Steel Beam Truss-SRC Column inner Joints,this paper designed and manufactured 8 shear destruction inner joints that considered three factors(axial compression ratio,the size of steel and angle steel),and low reversed cyclic loading tests were carried out to study the failure pattern of Reinforced Concrete encased Steel Beam Truss-SRC Column inner Joints,and obtained the loading and displacement values and each state strain values. The failure pattern of Reinforced Concrete encased Steel Beam Truss-SRC Column inner Joints can be concluded in this paper into three stages:elastic stage, elastic-plastic stage and failure stage.(2)Obtained The load-displacement hysteretic curves, load-displacement curve by experiment. According to the load displacement hysteretic curve and load displacement curve, calculated displacement ductility coefficient, energy consumption indicators, and analyzed the influence of the axial compression ratio, the amount of steel, angle size on the ductility and energy dissipation capacity, bearing capacity. Experiments showed that:Axial compression ratio had a certain influence on the ductility,the deformation and bearing capacity,which the relatively small axial compression member skeleton curve was flat, and ductility was slightly better than the larger axial compression ratio of components, and deformation ability is stronger.For the larger axial compression ratio components, large axial compression ratio can improve the shear bearing capacities appropriately, but reduce the ductility and deformation capacity;Specimens with greater amount of steel show that the shear bearing capacity is larger, and seismic performance is better.(3)Combining with the test data, established restoring force that suits Reinforced Concrete encased Steel Beam Truss-SRC Column inner Joints,,and test model can fit the skeleton curve well.(4) Combined with the test results, joints design Suggestions and structural measures are given.On shear bearing capacity calculation, it is concluded that the calculation method of the solid-web steel reinforced concrete frame joints is suitable for the reinforced concrete encased steel truss. |
