Research on seismic performance of steel tubed reinforced concrete column frame structures considering the influence of joint region
In recent years,steel tubed reinforced concrete(STRC)column structures have become one of the research hotspots in composite structures.The disconnection of the steel tube at the end of the column could fully exerts its confinement effect on core concrete,enhancing the bearing capacity and seismic per-formance of the column.However,the joint region will become relatively weak.When conducting structural performance analysis traditionally,joints are often regarded as rigid region,without considering the deform-ation and damage of the joints on the structure.This will cause certain safety hazards in the analysis and de-sign of STRC column structures.This article utilizes the joint element Joint2D to simulate the entire process of joint deformation in the STRC frame structure,analyzes the influence of joint elements on seis-mic performance simulation results,as well as the seismic vulnerability evaluation and collapse resistance performance of structures with different strong joint coefficients.The results indicate that the analysis re-sults without considering joint performance will overestimate the structural performance,resulting in per-formance indicators that do not meet the code limit requirements being analyzed as meeting the require-ments.The strong joint coefficient 1.5 for the first level seismic resistance in the code Technical Standard for Steel Tube Confined Concrete Structures will tend to be unsafe in rare earthquakes.To meet the safety and collapse resistance of the structure,it is recommended to take a strong joint coefficient of 1.7.
万方数据
维普
