Experimental Study And Feasibility Analysis Of A New-typed First Class High-rise Steel Structure Residential System

In the policy background of housing industrialization and prefabricated steel structure development, many kinds of prefabricated steel structure housing emerged. In this paper, a new-typed steel structure system is conceived for the first class high-rise residential buildings in the 9~16 layer. The loading bearing system of new residential system is “box column+truss beam +part support+floor deck”. And following work was done:1. Experimental research was carried out on the assembled joints of the new steel structure residential system. The influence of the column thickness, axial compression ratio and oblique support on the rotation performance and load carrying capacity of the joints were studied. Research on the stress characteristics and failure modes were studied. The finite element analysis software of ABAQUS was used to carry out the finite element analysis of all experimental joints, and compared experiment and finite element analysis results.2. The loading mode of the experimental joints were to impose a hinge constraint on both ends of the column, and to impose axial force on the column end, and the truss beams were subjected to monotonic or hysteretic loading. Experiment and finite element analysis results showed that: with column axial pressure ratio increased, node failure mode from buckling of beam end gradually changed for column instability; The truss beam web was easily in the loading process yield or fracture, later in the design should consider strengthening; The failure of the joint with diagonal braces were destroyed on the support, but the setting of the diagonal braces changed the beam transfer mode of the beam-column joints, which greatly improved the bearing capacity of the truss beam.3. For the practical engineering, in the same architectural plan and arrangement of column, the three schemes of "concrete structure", "Changsha Yuanda system", and " new residential system ", we carried on the theory analysis, the optimization design, the comprehensive comparison of its technology and the economical index.4. By using MIDAS/GEN to analyze three project, and analyzed new completely assembling steel structure Pushover at rare occurrence earthquake and examined the earthquake resistance of new system.5. The modal and inter-story drift of three system meet requirements.Throughing Pushover analysis of the new system under rare earthquake,it could get the performance points of capacity spectrum and demand spectrum curve in rare earthquake intensity of 8 degrees(0.30g), the elastic plastic displacement angle corresponding to the performance point meets the requirement of the specification. Member in this point only emerge plastic hinge at part bottom chord or web chord. It is proved the system meet requirements of earthquake resistance under 8 degree(0.20g) condition of Taiyuan area by the indirect method, and show that new system seismic behavior is good.6. Comprehensive comparing technical and economic analysis, building use function, time limit and other factors of three kinds of structural system, new type of assembling steel structure is the best project, verify the feasibility of new type of assembling steel structure.New type of Assembling Steel Structure in this paper meets the requirements of green building and future development; at the same time this paper can provide some reference for the research of assembly structure, also put forward the problems of further analysis.