钢结构梁端翼缘腋形扩大式刚性梁柱连接试验研究

参考日本《钢构造接合部设计指针》对钢结构梁端翼缘腋形扩大式刚性梁柱连接给出的构造要求和梁翼缘腋形加强板的计算公式,结合我国有关规范设计了4个1/2缩尺模型的T形连接试件,试件的柱为箱形截面,梁为H形截面,梁端翼缘腋形扩大后与贯通的柱隔板对接焊接。设计时分别考虑了梁翼缘宽厚比、腹板高厚比及不同加强方式的影响,然后进行了低周往复荷载作用的伪静力试验,对试验现象及试验结果进行了分析。试验结果表明,该连接形式强度和刚度较好,能满足我国现行抗震规范的要求。但该连接构造形式塑性转动能力稍差,不能完全满足特殊抗弯钢框架连接塑性转动能力的要求。

Experimental study on steel moment resistant frame connections with enlarged beam flanges welded to column

The details and design formulae of steel moment resistant frame connections reinforced by haunch enlarged beam flanges welded to the column diaphragm were put forward based on the suggestion of "Recommendation for Design of Connections in Steel Structures" of Japan.Then,4 one-half scale T-shape specimens were designed based on the Chinese codes with enlarged flanges of H-shape beam welded to the diaphragm of diaphragm-through type columns.The specimens considered the influences of the width-to-thickness ratio of beam flanges and the height-to-thickness ratio of webs,together with different types of reinforcement.The experiment was carried out under cyclic beam bending with constant axial compression on column.The test results revealed that the connections of this reinforcement type had a good performance of the strength and rigidity,and may satisfy the demand of current Chinese code on seismic design.However,the plastic rotation was limited and could not fully satisfy the demand of special moment resistant frames.