装配式钢牛腿偏心受压力学性能试验与有限元分析  

Finite Element Analysis and Test of Mechanical Properties under Eccentricity Compression of Fabricated Steel Corbels

作　　者：钱斌 毛小勇[1] QIAN Bin;MAO Xiao-yong(School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China)

机构地区：[1]苏州科技大学土木学院,苏州215011

出　　处：《科学技术与工程》2021年第21期9050-9058,共9页Science Technology and Engineering

基　　金：国家自然科学基金(51778396);江苏省研究生科研创新计划(SJCX19_0836)。

摘　　要：装配式钢牛腿,因其结构简单、安装方便、使用安全得到广泛肯定。针对一种新型装配式钢牛腿开展研究。考虑肋板厚度、偏心距、锚板类型,进行了4个不同形式的装配式钢牛腿的偏心受压力学试验。测定了钢牛腿节点的荷载-变形曲线、应力分布状态、极限强度,观测其破坏形式,建立了有限元模型,分析研究了荷载-变形关系和节点弯矩-转角关系。结果表明:钢牛腿节点呈现出半刚性节点特征。牛腿有两种破坏形式,当锚板无支撑保护时,锚板在牛腿还未达到极限承载力时先屈曲破坏;当锚板有支撑保护时,牛腿的极限承载力取决于螺栓的抗剪强度。从应力分布上对比发现,结构刚度突变处应力集中。连接处的焊缝质量和螺栓的材质是受力的关键,改善它们将极大地提高节点的承载能力。钢牛腿肋板厚度越大,极限承载力越大;偏心距越小,极限承载力越大。节点的初始刚度随肋板的加厚小幅增加,偏心距对节点初始转动刚度影响效果不明显,侧板与锚板安装间隙过大会降低节点刚度,应尽可能减少制作误差。The fabricated steel corbel was widely recognized for its simple structure,convenient installation and safe use.A new type of fabricated steel corbel was studied.Considering the thickness of rib,eccentricity and the type of plate,four different forms of prefabricated steel corbels were tested for the mechanical resistance.The load-deformation curve,stress distribution,ultimate strength of steel corbels and failure modes of the specimens were recorded and presented,and a finite element model was established to analyze the load deformation relationship and the moment rotation relationship.The results show that the steel corbel joint is semi-rigid.There are two failure modes of corbel.When the anchor plate has no support protection,the anchor plate will buckle before the bracket reaches the ultimate bearing capacity.When the anchor plate is supported,the ultimate bearing capacity of the bracket depends on the shear strength of the bolt.From the comparison of stress distribution,it is found that the stress concentration occurs at the abrupt change of structural stiffness.The quality of weld joint and the material of bolt are the key to stress,and improving them will greatly improve the bearing capacity of the joint.The larger the thickness of steel corbel rib,the greater the ultimate bearing capacity.The smaller the eccentricity,the greater the ultimate bearing capacity.The initial stiffness of the joints increases slightly with the thickness of the rib,but the eccentricity does not exert an obvious effect on the initial rotational stiffness of joints.If the clearance between the side panel and the column wall is too large,the stiffness will decrease apparently,thus the fabrication error should be reduced as much as possible.

关 键 词：装配式 钢牛腿 偏心受压 静载试验 有限元模拟 

分 类 号：TU398[建筑科学—结构工程]