论文部分内容阅读
以试件截面宽厚比为主要变化参数,对5根薄壁方钢管柱的轴压静力性能进行了试验研究,通过试验得到试件的破坏形态、荷载-压缩位移曲线以及极限承载力等数据,并采用ANSYS对其进行数值模拟计算分析,研究结果表明:(1)有限元模拟结果、试验结果与按《冷弯薄壁型钢结构技术规范》所计算的稳定极限承载力吻合良好,可以采用有限元做大量参数分析。(2)所有试件在柱脚发生局部屈曲导致试件迅速失稳破坏,宽厚比为40和60的试件的承载力较低,钢材未达到屈服强度,管壁就已经发生局部屈曲,钢材性能未得到充分发挥。(3)随着宽厚比的减小,柱的应力重分布能力增强,柱的延性性能和极限承载力得到提高,结合结构的正常使用极限状态、使用条件以及考虑经济性的要求,提出选择恰当的宽厚比限值要求。
The axial compressive and static properties of 5 thin-walled square steel tubular columns were studied by taking the aspect ratio of the specimens as the main variation parameter. The failure morphology, load-displacement curve and ultimate bearing capacity of the specimens were obtained by experiments. The results of numerical simulation with ANSYS show that: (1) Finite element simulation results show that the test results agree well with the calculated ultimate bearing capacity according to “Technical Specification for Cold-formed Thin-walled Steel Structures” Do a lot of parameter analysis. (2) Local buckling of all specimens at the column foot resulted in rapid failure of the specimens. The bearing capacity of specimens with aspect ratios of 40 and 60 was low, and the yield strength of steel did not reach. Performance is not fully demonstrated. (3) As the aspect ratio decreases, the stress redistribution ability of the column increases, and the ductility and ultimate bearing capacity of the column are improved. Based on the normal use limit state of the structure, the service conditions and the economic requirements, The aspect ratio requirements.