摘要
板肋加劲板是组成钢箱、钢拱、钢塔以及钢墩等桥梁结构的基本构件,其受压稳定问题是钢桥设计的重点.为研究板肋加劲板的受压整体稳定性能,设计了不同几何尺寸的板肋加劲板试件,进行轴向加载试验,测量各试件的初始几何缺陷,同时建立相应的有限元模型,考虑本构关系、残余应力与初始几何缺陷的影响,通过大量数值计算得到稳定折减系数,并与各国规范进行比较.分析结果表明,试件的几何缺陷沿板宽方向呈现中间高、两边低的形式,纵向初弯曲的方向具有一定的随机性.板肋加劲板整体稳定中长柱试件发生中部的弯曲失稳变形,且朝向被加劲板侧弯曲的极限承载力高于朝向板肋侧弯曲的极限承载力;整体稳定短柱试件主要发生肋间被加劲板的鼓曲与加劲肋端部的面外变形.随着长细比的增大,被加劲板侧弯曲试件的轴向平均应力-位移曲线的失稳特征更加明显.试验与有限元计算得到的稳定系数均高于中国钢桥规范中的b类柱子曲线的稳定系数,可偏安全采用规范中的b类柱子曲线进行板肋加劲板整体稳定计算.
I-rib stiffened plates are the basic components of steel boxes,steel arches,steel toweres and steel pieres in bridge structures.The stability of stiffened plate under compression is the focus of steel bridge design.To study the overall stability performance of stiffened plates,I-rib stiffened plate specimens with different geometric dimensions were designed for an axis compression test.The initial geometric imperfections of specimens were measured,and corresponding finite element models were established.The effects of the constitutive relationship,residual stress,and initial geometric imperfections were considered.The stability reduction coefficients were obtained by massive numerical calculations and compared with national codes.Analytical results show that the imperfections of the specimen are high in the middle and low on both sides along the plate width,and have randomness in the initial bending direction.For the medium and long column specimen,bending instability deformation occurs in the middle of the specimen,and the ultimate bearing capacity of the stiffened plate side bending is higher than that of the stiffener side.For the short column specimen,the out-plane-buckling deformation occurs in the middle of stiffened plates and stiffeners end.With the increase of slenderness ratio,the instability characteristic of axial average stress-displacement curve for the specimen with stiffened panel side bending is more obvious.The stability coefficients of test and finite element model are higher than the class B column curve in the Chinese steel bridge code.Using the class B column curve in the Chinese code for calculation is safe.
作者
赵秋
陈鹏
张骏超
余澳
蔡威
ZHAO Qiu;CHEN Peng;ZHANG Junchao;YU Ao;CAI Wei(School of Civil Engineering,Fuzhou University,Fuzhou 350108,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2023年第5期1297-1311,共15页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51108087,51478120)。
关键词
板肋加劲板
整体稳定
轴压试验
初始几何缺陷
数值模拟
稳定折减系数
柱子曲线
I-rib stiffened plate
overall stability
axial compression test
initial geometric imperfection
numerical simulation
stability reduction factor
column curve
