十字形钢管束自密实混凝土短肢剪力墙轴压性能研究  

Study on axial compression behavior of self-compacting concrete short-leg shear wall with cross-shaped steel tube bundles

作　　者：李宏波[1,2,3] 李盛 延常玉 殷建光 张虎彪 童彧斐 LI Hongbo;LI Sheng;YAN Changyu;YIN Jianguang;ZHANG Hubiao;TONG Yufei(College of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Ningxia Research Center of Technology on Water-saving Irrigation and Water Resources Regulation,Yinchuan 750021,China;Ningxia Center of Research on Earthquake Protection and Disaster Mitigation in Civil Engineering,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]宁夏节水灌溉与水资源调控工程技术研究中心,银川750021 [3]宁夏土木工程防震减灾工程技术研究中心,银川750021

出　　处：《建筑结构》2024年第6期23-31,共9页Building Structure

基　　金：宁夏自然科学基金项目(2021AAC03080);国家自然科学基金项目(52069025);宁夏高等学校一流学科(水利工程学科)资助项目(NXYLXK2021A03)。

摘　　要：为研究十字形钢管束自密实混凝土短肢剪力墙的轴压受力性能,通过模型试验研究和ABAQUS数值模拟相结合的方法,对不同腔体数十字形钢管束自密实混凝土短肢剪力墙的轴压性能进行分析。首先,根据轴压试验结果对剪力墙的破坏形态和轴向荷载-应变曲线等轴压受力性能进行分析,提出轴压承载力计算公式。其次,建立剪力墙轴压有限元计算模型,将试验结果和模型计算结果进行对比以验证有限元模型的准确性。最后,根据有限元参数化分析结果验证并修正剪力墙轴压承载力计算公式。研究发现,剪力墙的轴向荷载-应变曲线在不同腔体数下具有相似的特征,表明其变形能力良好。在破坏过程中,钢管束对核心混凝土的约束作用显著,提高了试件的延性和承载能力,其中钢管束的破坏主要表现为多波鼓曲和焊缝开裂,尤其是在钢管束中部的1/4区域。此外,随着腔体数增加,剪力墙极限承载力提升,但其延性系数有所下降。本研究提出的简化公式与有限元分析结果的误差控制在10%以内,该公式可为工程设计应用提供理论借鉴。In order to study the axial compressive behavior of self-compacting concrete short-leg shear wall with cross-shaped steel tube bundles,the axial compressive behavior of self-compacting concrete short-leg shear walls with cross-shaped of steel tube bundles with different cavities was analyzed by model test and ABAQUS numerical simulation.Firstly,according to the results of axial compression test,the failure mode of shear wall and the axial load-strain curve under equal axial compression were analyzed,and the axial compression bearing capacity calculation formula was proposed.Secondly,the finite element calculation model of shear wall axial compression was established,and the test results were compared with the model calculation results to verify the accuracy of the finite element model.Finally,according to the results of finite element parameterization analysis,the calculation formula of axial compression bearing capacity of shear wall was verified and modified.The study reveals that shear walls exhibit similar characteristics in axial load-strain curves across different numbers of cavities,indicating good deformability.Throughout the failure process,the steel tube bundles significantly confine the core concrete,enhancing the specimens'ductility and load-bearing capacity.The failure of steel tubes is primarily characterized by multiple bulging and weld crackings,especially around the middle quarter of the steel bundles.Moreover,an increase in the number of cavities leads to improved ultimate load-bearing capacity of the shear walls,albeit with a reduction in ductility coefficient.The error between the simplified formula and the finite element analysis results is controlled within 10%.The formula can provide theoretical reference for engineering design applications.

关 键 词：钢管束 自密实混凝土 短肢剪力墙 轴压性能 极限承载力 

分 类 号：TU398[建筑科学—结构工程]