深圳大学学报理工版

研究组装式钢货架焊接式柱脚节点,分析此种节点绕立柱截面对称轴的抗弯性能,以及轴力对节点抗弯性能的影响.试验中节点的主要变形为底板扭曲,在立柱转角较大时,立柱角部附近腹板的焊缝被撕裂. 结果表明, 立柱中的轴力可增加节点的初始刚度和极限弯矩. 有限元模拟结果与试验结果吻合较好.通过对比参数发现,立柱轴力对柱脚节点初始刚度的增强效果会随着轴力的增大而减弱; 轴力较大的试件具有较长的节点弯矩-转角曲线弹性段; 增加立柱底板厚度可有效提高柱脚节点的刚度和抗弯承载力.

The tests of column base connections in assembled storage racks were carried out to investigate the bending behavior of the connections rotating around the column section's symmetry axis. The effect of column axial force on the bending property of connections was taken into consideration. The main deformation of tested connections was the distortion of the baseplate and the tear at the column corner weld. Tests indicate that the column axial force is a positive factor for initial stiffness and ultimate moment of connections. These connection tests are numerically simulated using the finite element method, and the test results demonstrate the reliability of the simulation. The conclusions obtained by parameter comparisons include: ① The increase of the column axial force is able to enhance the initial stiffness of connection. ② The connection with a larger column axial force has a longer elastic stage in moment-rotation curves. ③ The increase of baseplate thickness is also an efficient method for heightening the stiffness and bending capacity of column base connections.

引言
1 试验概况
2 结果及分析
3 有限元模拟
4 柱脚节点刚度的影响
5 结语

图1 横梁式货架及其节点类型<br/>Fig.1 Selective pallet rack and its base connections

图1 横梁式货架及其节点类型
Fig.1 Selective pallet rack and its base connections

图2 柱脚节点构造图(单位:mm)<br/>Fig.2 Details of tested column base connection(unit:mm)

图2 柱脚节点构造图(单位:mm)
Fig.2 Details of tested column base connection(unit:mm)

表1 构件的材性性能<br/>Table 1 Material properties of components

表1 构件的材性性能
Table 1 Material properties of components

图3 试验装置示意图<br/>Fig.3 Schematic diagram of the test setup

图3 试验装置示意图
Fig.3 Schematic diagram of the test setup

图4 试验和数值计算得到的荷载-位移曲线<br/>Fig.4 Test and calculated moment-rotation curves of specimens

图4 试验和数值计算得到的荷载-位移曲线
Fig.4 Test and calculated moment-rotation curves of specimens

图5 确定极限弯矩方法<br/>Fig.5 Method for calculating the ultimate moment

图5 确定极限弯矩方法
Fig.5 Method for calculating the ultimate moment

表2 试件初始刚度和极限弯矩<br/>Table 2 Initial stiffness and ultimate moment of specimens

表2 试件初始刚度和极限弯矩
Table 2 Initial stiffness and ultimate moment of specimens

图6 节点变形<br/>Fig.6 Deformation of connections

图6 节点变形
Fig.6 Deformation of connections

图7 试件弯矩-水平荷载曲线<br/>Fig.7 Moment-lateral force curves of specimens

图7 试件弯矩-水平荷载曲线
Fig.7 Moment-lateral force curves of specimens

图8 柱脚节点有限元模型<br/>Fig.8 Finite element models of column base connection

图8 柱脚节点有限元模型
Fig.8 Finite element models of column base connection

表3 有限元模型分类1)<br/>Table 3 Classification of finite element models

表3 有限元模型分类1)
Table 3 Classification of finite element models

表4 节点模型初始刚度的对比<br/>Table 4 Comparison of initial stiffness of models 单位:kN·m/rad

表4 节点模型初始刚度的对比
Table 4 Comparison of initial stiffness of models 单位:kN·m/rad

图9 节点荷载-位移曲线的对比<br/>Fig.9 Comparison of moment-rotation curves of connections

图9 节点荷载-位移曲线的对比
Fig.9 Comparison of moment-rotation curves of connections

图10 立柱的计算模型<br/>Fig.10 Calculation model of columns

图10 立柱的计算模型
Fig.10 Calculation model of columns

图11 梁刚度对立柱计算长度系数的影响<br/>Fig.11 Influence of Kc on effective length factor of columns

图11 梁刚度对立柱计算长度系数的影响
Fig.11 Influence of Kc on effective length factor of columns

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备注

引言

1 试验概况

2 结果及分析

3 有限元模拟

4 柱脚节点刚度的影响

5 结语

期刊信息

备注