石化压缩机厂房矩形钢管混凝土柱刚度计算对比分析

COMPARATIVE ANALYSIS OF STIFFNESS CALCULATION OF CONCRETE-FILLED RECTANGULAR STEEL TUBE COLUMNS IN PETROCHEMICAL PLANTS

利用Midas软件建模,对比计算了矩形钢管混凝土、混凝土和H型钢3种不同截面类型柱工业厂房的侧向位移,结果显示钢管混凝土柱刚度提高优势明显。钢管混凝土是1种组合材料,基于目前组合材料刚度的叠加折减理论,列举了国内外规范换算刚度的计算公式,相关规范将混凝土和钢管的线性叠加折减得到钢管混凝土组合截面刚度刚度,混凝土刚度的折减考虑混凝土开裂。为了研究钢-砼组合构件界面间相互作用的影响,通过Abaqus软件对钢管混凝土柱中钢-砼组合构件的相互作用建模并进行有限元分析,对比了钢管混凝土柱在受压,受弯等不同的工况下应力应变状态,分析了钢管混凝土容易破坏的部位,为计算和设计提供了依据。

Using Midas modeling,the lateral displacement of industrial columns with three different cross-section types,i.e.,concrete-filled rectangular steel tube,concrete and H-shaped steel,was compared and calculated.The results show that concrete-filled steel tube column has significant advantages in increasing stiffness.Concrete-filled steel tube is a kind of composite material,and calculation formulas for equivalent stiffness from domestic and international specifications were listed based on the current theory of the superposition and reduction of composite material stiffness.Relevant domestic and international specifications consider the linear superposition and reduction of concrete and steel tubes in the calculation of the section stiffness of concrete-filled steel tube composite structures,and the reduction of concrete’s stiffness takes into account the concrete cracking.In order to study the mutual constraints between concrete and steel tubes in practical applications,finite element analysis was carried out using Abaqus to model the interaction between steel and concrete in concrete-filled steel tube columns,and the stress-strain states of concrete-filled steel tube columns under different conditions such as compression and bending were compared.The analysis identified the parts of the structure that are prone to failure,providing a basis for calculation and design.