【作者】 韩冰； 朱淋峰； 王元丰；

【Author】 HAN Bing ZHU Lin-feng WANG Yuan-feng (School of Civil Engineering and Architecture,Beijing Jiaotong University,Beijing 100044,China)

【机构】 北京交通大学土木建筑学院；

【摘要】 钢管混凝土格构柱广泛应用于许多结构中,然而,它们的一些性能还没有得到较为充分的研究,例如徐变的影响.本文针对钢管混凝土的特点,将钢管混凝土轴心受压构件的徐变理论与有限元方法相结合, 建立模型计算钢管混凝土格构柱的徐变.该模型假设任一时间段内钢管混凝土格构柱分肢组合弹性棋量不变,计算应变增量,再计算折减的组合弹性模量,并对上述过程进行迭代计算获得钢管混凝土格构柱的徐变以及格构柱截面应力分布特点.应用建立的钢管混凝土格构柱徐变计算模型,对具体算例的徐变进行计算, 总结钢管混凝土格构柱的徐交规律,所得结论合理,表明了该模型具有一定的适用性.更多还原

【Abstract】 Concrete Filled Steel Tubular(CFST)lattice columns are used widely in many kinds of structures, however,their properties have not studied thoroughly at present,e.g.effects of creep,a basic behavior of concrete.According to the characteristics of CFST members,this paper has analyzed creep of CFST lattice columns by a constructed model which combines the creep theory of axially compressed CFST members with Finite Element(FE)method.Supposing that the composed elastic module of CFST lattice columns is invaria- ble during any little time segment firstly,the increment of strain is calculated by using the model,and then a discount composed elastic module is gotten.Accordingly,properties of the creep of CFST and the mainly stres- ses distribution among cross-sections of sub-legs in lattice columns can be obtained by iteration of above- mentioned procedures.Creep of lattice columns with three-legs is calculated by using the established meth- od,and according to the gotten results,it can be shown that the method presented in the paper is reasonable. At last,some conclusions of the creep of CFST lattice columns are summarized.In accordance with the con- clusions obtained by the paper,creep has an important influence on CFST lattice columns and should be paid enough attentions in actual engineering.更多还原