板式连接中心支撑钢框架结构推覆试验研究

发布时间：2019-02-25 11:03

【摘要】：为研究板式连接中心支撑钢框架结构在水平荷载作用下的承载力、延性、结构影响系数、节点受力模式、屈服机制以及节点处梁柱附加弯矩分布规律,对两榀按1∶2.6缩尺的3层中心支撑钢框架进行了静力推覆试验。结果表明支撑失稳后楼层水平刚度明显降低,但由于人字形支撑受拉斜杆的存在,楼层能够维持足够的水平承载力。弹塑性层间侧移角远高于抗震规范要求,具有较大的延性系数和结构影响系数。支撑节点板附近的梁柱上存在附加弯矩,基于弹性极限状态,得到了附加弯矩指数的试验值。支撑端部深入节点板较多时,节点板在支撑失稳后以圆弧塑性铰线形式产生面外转动,仍具有高于支撑的极限承载力和塑性变形能力。结构屈服机制合理,体现为支撑屈曲或屈服在先,节点板屈服和梁柱屈服在后,符合抗震设计要求。
[Abstract]:In order to study the bearing capacity, ductility, structural influence coefficient, joint stress mode, yield mechanism and the distribution law of Liang Zhu additional moment at the joint, the load-carrying capacity, ductility, structural influence coefficient, stress mode of joint, yield mechanism and the distribution of Liang Zhu's additional moment at the joint are studied. Two three-story central braced steel frames with 1: 2.6 scale were tested by static push test. The results show that the horizontal stiffness of the floor is obviously decreased after the bracing is unstable, but the floor can maintain enough horizontal bearing capacity due to the existence of the herringbone bracing. The lateral displacement angle between elastic-plastic layers is much higher than that required by seismic code and has a large ductility coefficient and structural influence coefficient. There is an additional bending moment on Liang Zhu near the supporting joint plate. Based on the elastic limit state, the experimental value of the additional moment exponent is obtained. When the end of the support is deep into the joint plate, the joint plate rotates out of plane in the form of circular arc plastic hinge after the instability of the support, and still has higher ultimate bearing capacity and plastic deformation ability than the bracing. The yield mechanism of the structure is reasonable, which shows that the buckling or yielding of the brace is first, the yield of the joint plate and Liang Zhu is after the yield, which conforms to the requirements of seismic design.
【作者单位】：结构工程灾变与控制教育部重点试验室(哈尔滨工业大学);哈尔滨工业大学土木工程学院;河北科技大学建筑工程学院;
【基金】：国家自然科学基金面上项目(51178145,51208169) 河北省自然科学基金项目(E2014208115)
【分类号】：TU391

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