School of Civil Engineering,Henan Polytechnic University
Henan Key Laboratory of Special Protective Materi⁃als
School of Civil Engineering,Xi’an University of Architecture and Technology

为进一步了解钢管砂轻混凝土短柱的轴压力学性能,基于已有试验数据,采用混凝土塑性损伤本构模型对试件进行有限元验证和全过程分析,研究不同变化参数对钢管砂轻混凝土短柱轴压力学性能的影响,采用灰色关联理论评估参数变化对钢管砂轻混凝土短柱极限承载力的关联程度。结果表明:计算的极限承载力和峰值位移在误差内均和试验值吻合,且对照试件的模拟破坏形态和试验破坏形态基本一致;钢管和核心砂轻混凝土的受力过程表现为协同作用;钢管屈服强度超过345MPa时,提高钢管屈服强度并不能明显提高试件的极限承载力;河砂取代率对钢管砂轻混凝土短柱的极限承载力影响最小。

In order to further understand the axial compression mechanical properties of sand- lightweight aggregate concrete-filled steel tubular stub columns,based on the available test data,the plastic damage model was then used to verify those specimens and perform he whole process analysis with a finite element.The effects of varying parameters on the compressive behavior of the specimens were investigated,and the extent to which these varying parameters related to the ultimate bearing capacity of SLACFST was assessed via a grey correlation analysis.Results showed that the calculated ultimate bearing capacity and peak dis‐placement could be consistent with the experimental value within the error,and the simulated failure modeof the control specimen was basically the same as the experimental failure mode.The mechanical process of the steel tube and the core sand-lightweight aggregate concrete showed a synergistic effect. As steel tube yield strength was more than 345 MPa,to improve the yield strength of steel tube couldn’t significantly im‐prove the ultimate bearing capacity of the specimen.The replacement ratio of river sand had the least influ‐ence on the ultimate bearing capacity of SLACFST stub columns.

国家自然科学基金资助项目(U1904188);河南省重点研发与推广专项项目(212102310288);河南省特种防护材料重点实验室开放课题(SZKFJJ202004);河南省高校基本科研业务费资助项目(NSFRF200320)