钢管混凝土边框密肋复合墙轴压性能研究  

Study on axial compression performance of multi-ribbed composite walls with CFST columns

作　　者：王苏[1,2] 朱倩 赵均海[1] 李英旭[1] 冯振东 胡家源 WANG Su;ZHU Qian;ZHAO Junhai;LI Yingxu;FENG Zhendong;HU Jiayuan(School of Civil Engineering,Chang'an University,Xi'an 710061,China;Infrastructure Department,Chang'an University,Xi'an 710018,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]长安大学基建处,陕西西安710018

出　　处：《建筑结构学报》2025年第2期156-170,共15页Journal of Building Structures

基　　金：国家自然科学基金项目(51878056);陕西省自然科学基金项目(2021JM-170,2018JQ5023)。

摘　　要：为研究钢管混凝土边框密肋复合墙的轴压性能,设计并完成3个1/4缩尺试件的单调竖向加载试验,考察各复合墙的受力机理、破坏形态、荷载-位移曲线及应变发展规律,分析了不同肋格形式、有无填充砌块对复合墙轴压性能的影响。采用ABAQUS软件建立有限元模型,对比数值模拟与试验得到的峰值荷载、变形特性及破坏模式。研究结果表明:复合墙在轴压作用下呈现出从砌块到肋柱再到边框柱的失效机制,且具有多道防线的特点;肋格形式可以调节墙体刚度,合理改善墙体的协同工作性能;填充砌块承担的应力占比为8%~11%,其作用主要是为肋格提供侧向支撑,提升墙体平面外稳定性。基于叠加原理计算轴向刚度计算,量化各组件的刚度分担比率,其中边框柱刚度占比在46.1%~50.4%之间,可用于墙体初步优化设计。依据建立的轴压承载力计算方法,开展基于关键参数变化的轴压性能对比研究,计算值与试验结果吻合较好,且发现肋柱混凝土强度、钢管壁厚对提升承载力效果显著。In order to investigate the axial compression performance of multi-ribbed composite walls with concrete filled steel tubular(CFST)columns,three 1/4 scaled specimens were designed and tested under monotonic vertical loading.The force mechanism,failure morphology,load-displacement curves and strain development law of specimens were observed.The influences of different rib forms and the presence or absence of filling block were further analyzed.Moreover,finite element models were developed by ABAQUS software,followed by the comparison between numerical and experimental results,including peak load,deformation performance and failure mode.The results show that the specimen under axial compression exhibits a failure mechanism from blocks to rib columns to frame columns,and has the characteristics of multiple lines of defense.Meanwhile,the proposed composite wall with different rib forms exhibits flexible stiffness adjustment and favorable cooperative working performance.The stress ratio of the filled block is 8%-11%,which mainly provides lateral support to the ribs and improves the out-ofplane stability of the specimen.Based on the superposition theory,the calculation results of axial compression stiffness were presented.Then the stiffness sharing ratio of each component was quantified and therein the frame column accounts for 46.1%-50.4%for the preliminary optimization design of the wall.According to the established formulas,a comparative study of axial compression performance was carried out with consideration of diverse key parameters.The theoretical predictions are found to be in better agreement with test results.It also indicates that the concrete strength of ribbed column and steel tube thickness have significant effect on the ultimate bearing capacity of walls.

关 键 词：钢管混凝土密肋复合墙 轴压试验 数值模拟 轴压刚度 承载力 

分 类 号：TU398[建筑科学—结构工程] TU317.1