节点域尺寸对钢框架节点塑性损伤分布规律的影响

Influence of Node Domain Size on Plastic Damage Distribution Law of Node in Steel Frames

为了研究节点域尺寸对钢框架节点塑性损伤分布规律的影响,以钢框架结构中常见的"十字型"梁柱节点为研究对象,通过节点域受力的平衡准则,着重对柱类型(箱型、钢管)、柱轴压比、梁柱截面高度比、柱宽度与层高比及结构跨高比等基本参量进行了分析。分析结果表明:梁、柱及其节点域组成的钢框架节点的塑性铰位置按不考虑节点域尺寸来判断时可能会出现误差。随柱轴压比、梁柱截面高度比增加,节点域与柱的强度比增加;而随跨高比的增加,节点域与柱的强度比减小。箱型柱钢框架结构的柱轴压比小于等于0.4时,柱强度为节点域强度的1.0倍至2.5倍。实际工程柱梁尺寸范围内,钢管柱钢框架的节点域强度大于同截面的柱强度。

In order to study the influence of the node domain size on the plastic damage distribution law of the node in the frames,the cross-shaped node of beam and column in the steel frames was selected. The column type( box,steel tube),the axial compression ratio of column,the ratio of section to height of column and beams,the ratio of the width to the height of the column,and the ratio of height to span of the structure were analyzed by the force balance principle of the node domain. The results show that the location of the plastic hinge of the node made of beam or column and the node domain may be inaccurate without considering the size of the node domain. With the increase of the axial compression ratio of column and the ratio of section to height of beam and column,the strength ratio of the node domain to the column grows. With the increase of the ratio of span to height of the structure,the strength ratio of node domain to column diminishes. When the axial compression ratio of the box column in the steel frame is less than or equal to 0. 4,the strength of the column is 1. 0 or 2. 5 times than the strength of node domain. In the size range of column and beam of the actual engineering,the strength of the node domain of steel tube in steel frame is greater than that of steel tube column with the same section.