【摘要】 对常温下方钢管混凝土(CFSST)中的钢材和混凝土的受力情况分别进行了分析,在此基础上,总结了常用的本构关系模型;介绍了高温后CFSST中钢材和混凝土的本构关系模型;提出了一种新的,考虑钢材侧向约束作用的,恒高温后CFSST中钢材和混凝土的本构关系模型;用实验验证了该模型的有效性。结果表明理论计算和实验结果吻合良好,所提模型是合理有效的。更多还原

【Abstract】 The performance and behavior of steel and concrete in concrete-filled square steel tube(CFSST) at ambient temperature is described firstly.Meanwhile the constitutive relation model widely used is also analyzed and summed up.A constitutive relation model between steel and concrete in CFSST after high temperature is introduced.A new constitutive relation model of steel and concrete after high temperature,which could allow for the effect of steel-tubular-lateral-confinement on core concrete is presented.The validity of the proposed model is illustrated by test results.The result shows that the theoretical analysis is in good agreement with the test results and the proposed model is reasonable and effective.更多还原