方钢管型钢再生混凝土偏压柱力学性能非线性有限元分析  

Nonlinear finite element analysis on mechanical behavior of SRRC filled square steel tube eccentric compression columns

作　　者：马辉[1] 陈云冲 贾梦璐 崔航 赵艳丽 李哲[1] Ma Hui;Chen Yunchong;Jia Menglu;Cui Hang;Zhao Yanli;Li Zhe(School of Civil Engineering and Architecture,Xi'an University of Technology,710048,Xi'an,China;Research and design institute of water conservancy and hydropower,Xi'an University of Technology,710048,Xi'an,China)

机构地区：[1]西安理工大学土木建筑工程学院,西安710048 [2]西安理工大学水利水电研究设计院,西安710048

出　　处：《应用力学学报》2021年第5期2069-2078,共10页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51408485);陕西省自然科学基础研究计划(2019JM-193);陕西省住房城乡建设科学技术计划(2015-K129);西安理工大学科学研究计划(2016CX028)。

摘　　要：结合方钢管型钢再生混凝土柱偏心受压试验研究,采用ABAQUS软件建立偏压柱有限元模型并进行数值分析,对比计算结果与试验结果,验证模型的合理性,进一步分析参数对该偏压柱受力性能的影响规律。结果表明:偏压柱跨中截面挠度变形明显,构件发生典型的压弯破坏形态;偏心距、长细比或者宽厚比的增加对偏压柱的承载力不利,其中偏心距及长细比对偏压柱承载力的影响最为显著,随着偏心距和长细比的增大,偏压柱承载力最大降幅分别为25%和29%;另外,提高再生混凝土或钢材强度可以有效地增加偏压柱的承载力;同时,偏压柱的延性随钢材强度的提高而增加,随再生混凝土强度的提高而降低;提高再生骨料取代率会降低试件的承载力,全再生混凝土试件的偏压承载力相对于普通混凝土试件降低了17.2%,但对试件的延性影响不明显。基于叠加原理与现有规范,提出了偏压柱承载力实用计算公式,计算值与试验值比值的均值为1.08,方差为0.114,能够满足工程计算要求。Based on the eccentric compression test of steel reinforced recycled concrete filled square steel tube columns,the finite element model of eccentric compression column were established and numerically analyzed by ABAQUS software.The calculated values were compared with the experimental values,and the rationality of the finite element model of columns was verified.Besides,the influence of design parameters on the mechanical properties of columns was analyzed in detail.The results show that the deflection of columns in the mid-span section was obvious,the bending failure mode occurred to the columns under eccentric compression loads.The increase of the eccentricity,slenderness ratio or width-thickness ratio of specimens is detrimental to the bearing capacity,respectively.Among them,the eccentricity and slenderness ratio have the most significant influence on the bearing capacity of columns.With the increase of eccentricity and slenderness ratio,the maximum reduction of the bearing capacity of specimens is 25%and 29%,respectively.In addition,increasing the strength of recycled concrete or steel can effectively increase the bearing capacity of eccentrically loaded columns.At the same time,the ductility of eccentrically loaded columns increases with the increase of steel strength,and decreases with the increase of recycled concrete strength.The bearing capacity of columns decreases with the increase of recycled coarse aggregate replacement percentage.The bearing capacity of columns fully using recycled coarse aggregates is 17.2%lower than that of ordinary concrete columns,but the ductility of columns is not significantly affected.A practical formula for calculating the eccentric compressive bearing capacity of the columns is proposed.The mean of the ratio of calculated values to experimental values is 1.08,the variance is 0.114.The calculated values are in good agreement with the experimental ones.

关 键 词：方钢管混凝土 型钢再生混凝土 偏压柱 受力性能 有限元分析 

分 类 号：TU323.1[建筑科学—结构工程]