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

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，验证结果表明有限元模型建立准确。研究考虑工字钢参数为，工字钢放置方向（纵向放置工字钢(ZG)、横向放置工字钢(HG)）、工字钢高度(GD)(25 mm、50 mm、75 mm、100 mm、125 mm)、工字钢宽度(KD)(25 mm、50 mm、75 mm、100 mm、125 mm)、工字钢翼缘厚度(YH)(10 mm、15 mm、20 mm、25 mm、30 mm)、工字钢腹板厚度(FH)(10 mm、15 mm、20 mm、25 mm、30 mm)。结果表明当含钢率小于34%时，ZG-FH参数变化对局压承载力影响较大，当含钢率大于34%时，HG-YH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，ZG-KD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，经过本文模拟结果验证，计算公式得出承载力误差位于0.9 - 1.1，计算结果较为准确。

Finite element analysis of local compressive behavior of circular end concrete filled steel tubular short columns with built-in I-steel

In order to study the local compressive performance of circular end concrete-filled steel tubular (CECFST) short columns with built-in I-steel, through the finite element software ABAQUS is used to investigate, and the existing research data are used to verify and the result of the finite element model show the establish accuracy. The parameters of I-beam considered in this paper are I-beam placement direction (longitudinal (ZG) and transverse (HG)), I-beam height (GD) (25 mm, 50 mm, 75 mm, 100 mm and 125 mm), I-beam width (KD) (25 mm, 50 mm, 75 mm, 100 mm and 125 mm), I-beam flange thickness (YH) (10 mm, 15 mm, 20 mm, 25 mm and 30 mm), I-beam web thickness (FH) (10 mm, 15 mm, 20 mm, 25 mm and 30 mm). The result show that when steel ratio is less than 34%, the change of ZG-FH parameters has a great impact on the local compressive bearing capacity, When steel ratio is greater than 34%, the change of HG-YH parameters has a great impact on the local compressive bearing capacity. Compared with the impact of the change of I-beam height and I-beam width on the local compressive bearing capacity, the change of ZG-KD parameters has a great impact on the local compressive bearing capacity. At the same time, the calculation formula of local compressive bearing capacity is proposed. Verified by the simulation results in this paper, the calculation formula shows that the bearing capacity error is 0.9 - 1.1, and the calculation result is more accurate.