往复加载下隔板贯通式箱型中柱-削弱型H型钢梁节点破坏机理研究  

Fracture Mechanism of Diaphragm-through Type Joints of Steel Box Column and Reduced H-style Steel Beam under Low Cyclic Reversed Loading

作　　者：童科挺 王万祯[1] 郭戈[1] 王伟焘 孙韶江 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2015年第4期53-58,共6页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：浙江省公益性技术应用研究计划(2013C31058);浙江省自然科学基金(LY12E08008);浙江省151人才工程项目(11-3-079);宁波市自然科学基金(2013A610192)

摘　　要：为研究箱型柱-H型钢梁节点在强震时的脆断机理和延性节点构造,对4个隔板贯通式箱型中柱-H型钢梁节点试验（1个常规节点和3个对接焊缝扩大头及梁翼缘圆孔削弱型节点）进行了低周往复循环加载试验和基于结构钢椭球面断裂模型及偶联的椭球面屈服模型的断裂分析.结果表明：隔板贯通式箱型中柱-H型钢梁常规节点在应力高度集中的梁翼缘对接焊缝处脆断;扩大头构造消除了对接焊缝沿梁翼缘宽度的几何突变,降低了对接焊缝的应力集中程度和脆断风险;梁翼缘上开设的圆孔构造促使塑性铰形成于远离节点区的梁削弱截面;对接焊缝扩大头及梁翼缘圆孔削弱型节点的承载力较常规节点降低5.5%~9.4%.In order to study the fracture mechanism, the test on ductile joints of steel box column for the H-style steel beam under the seismic loading and low cyclic reversed loading is conducted on four diaphragm-through type joints of steel box interior column and H-style steel beam, including one conventional joint and three joints with enlarged juncture and opening holes in the beam. The test is based on an elliptical fracture model coupled with an elliptical yield model of constructional steel. The results show that the conventional joint brittle fractures at butt weld between beam flange and diaphragm where the stress is highly concentrated. Enlarged juncture eliminates geometry mutation of butt welds along the beam flange width, and reduces the degree of stress concentration and the risk of brittle fracture of the butt weld. Plastic hinge causes the weaken beam section distant from the panel zone due to the opening holes at beam flanges. The load bearing capacity of the joint with enlarged juncture and opening holes at the beam flanges reduces by 5.5%-9.4% compared with that of the conventional joint.

关 键 词：箱型柱-H型钢梁节点 椭球面断裂模型 椭球面屈服模型 扩大头 塑性转角 承载力 

分 类 号：TU391[建筑科学—结构工程]