内置工字钢圆端形钢管混凝土短柱局压性能的有限元分析

Finite Element Analysis of Local Compressive Behavior of Circular End Concrete Filled Steel Tubular Short Columns with Built-in I-steel

为研究内置工字钢圆端形钢管混凝土短柱局压性能,通过有限元软件ABAQUS进行建模分析,并使用现有试验数据进行验证,研究了工字钢参数变化对内置工字钢圆端形钢管混凝土短柱局压性能影响。结果表明,有限元模型建立准确;当含钢率小于34%时,纵向放置工字钢腹板厚度参数变化对局压承载力影响较大;当含钢率大于34%时,横向放置工字钢翼缘厚度参数变化对局压承载力影响较大;对比工字钢高度与工字钢宽度变化对局压承载力的影响,纵向放置工字钢宽度参数变化对局压承载力影响较大。同时提出局压承载力计算公式,经过模拟结果验证,所提公式计算承载力与模拟承载力比值为0.86~1.06,计算结果较为准确。

In order to study the local pressure performance of circular end concrete-filled steel tubular(CECFST)short columns with built-in I-steel circular ends,the finite element software ABAQUS was used for modeling and analysis,and the existing test data was used for verification.The influence of I-steel parameters on the local compression behavior of concrete-filled steel tubular short columns with embedded I-steel circular ends was studied.The results show that the finite element model is accurate.When the steel ratio is less than 34%,the change of the thickness parameters of the longitudinally placed I-steel web has a great influence on the local compression bearing capacity.When the steel ratio is greater than 34%,the change of the thickness parameter of the I-steel flange placed transversely has a great influence on the local pressure bearing capacity.Comparing the influence of the change of the height and width of the I-steel on the local pressure bearing capacity,the change of the width parameter of the longitudinally placed I-steel has a greater influence on the local pressure bearing capacity.At the same time,the calculation formula of local compressive bearing capacity was proposed.Through the verification of simulation results,the ratio of calculated bearing capacity and simulated bearing capacity of the proposed formula is 0.86~1.06,and the calculation results are relatively accurate.