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ANALYSIS OF BEARING CAPACITY OF COLD-FORMED THIN-WALLED STEEL DOUBLE-LIMB BATTENED-PLATE LATTICE COLUMNS UNDER AXIAL COMPRESSION
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摘要: 为了满足特殊低层轻型房屋结构的大刚度和高承载要求，提出一种缀板式冷弯薄钢双肢格构柱，并对其进行轴压承载力研究。采用ABAQUS有限元软件，分析了柱二次卷边长度、腹板厚度、缀板数对薄钢格构柱轴压承载力的影响机制，得到了各工况格构柱的荷载-位移曲线、应力发展趋势及破坏模式。研究表明：相同截面的冷弯薄钢格构柱承载力随柱长增加而降低，构件破坏模式从强度破坏转向整体失稳破坏且同时伴有局部屈曲和畸变屈曲；增加板件厚度对提高冷弯薄钢格构柱轴压承载力效果明显，而二次卷边长度和缀板数对薄钢格构柱轴压承载力的影响非正增长。经对比分析，缀板式双肢薄钢格构柱在轴压作用下承载能力高、抗侧刚度好。在所研究的格构柱截面尺寸参数范围内，建议格构柱薄钢厚度取1.0~1.5 mm、缀板间距取300 mm、二次卷边长度取截面高度1/3，为构件设计提供参考。Abstract: In order to meet the requirements of high stiffness and high bearing capacity of special low-rise light-weight building structure,a kind of cold-formed thin-walled steel double-limb battened-plate lattice column was proposed to study the axial bearing capacity.The influence mechanism of the edge stiffener length,web thickness and the number of batten plates on the bearing capacity of thin-walled steel lattice columns under axial compression was analyzed by using ABAQUS finite element software.The load-displacement curve,stress development trend and failure mode of the grid columns under various working conditions were obtained.The results showed that the bearing capacity of cold-formed thin-walled steel lattice columns with the same section decreased with the increase of the length of the columns,and the failure mode of the members changed from strength failure to overall instability failure,and the local buckling and distortion buckling were accompanied.The increase of plate thickness had a great influence on the axial compression capacity of cold-formed thin-walled steel lattice columns,while the influence of the edge stiffener length and the number of batten plates on the bearing capacity of the thin-steel lattice column under axial compression was not positive.Through comparative analysis,the thin-walled steel double-limb battened-plate lattice columns had high bearing capacity and good lateral stiffness under axial compression. Within the range of section size parameters of lattice columns,it was suggested that the thickness of thin-walled steel of lattice columns should be 1.0-1.5 mm,the spacing of batten plates should be 300 mm,and the length of edge stiffeners should be 1/3 of the section height,so as to provide a reference for the design of members.
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