Research status and analysis progress of steel tube-confined reinforced concrete column-beam joints
Steel tube-constrained reinforced concrete(STRC)columns have superior mechanical properties.However,when STRC columns are used in frame structures,there is often a problem that it is difficult to meet the seismic design requirements of"strong nodes and weak members".In order to improve the seismic performance of the STRC column-beam joints,the current structural form and reinforcement mechanism of the STRC column-beam joints were summarized,and various structural forms of joints were compared from the aspects of working mechanism,reinforcement effect,and ease of construction."composite joint"is considered as the best way to solve the weak problem of STRC column frame joints.The axial compression performance,seismic performance and theoretical design methods of the STRC column joints with different structural forms were further analyzed.The results show that the ring beam has a significant increase in the axial compression bearing capacity of the joints.The axial compression and seismic performance of steel tube-constrained joints are good,and the design theory is relatively mature.Finally,the urgent problems in this research field and the research development direction were analyzed based on experimental and theoretical research.
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