考虑损伤断裂的新型梁柱节点抗连续倒塌研究  

Anti-collapse study of new beam-column joints considering damage and fracture

作　　者：魏建鹏 田黎敏[2] 郭杨[1] 乔惠云[3] WEI Jianpeng;TIAN Limin;GUO Yang;QIAO Huiyun(Anhui Province Key Laboratory of Green Building and Assembly Construction,Anhui Institute of Building Research and Design,Heifei 230031,China;Institute of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;College of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]安徽省建筑科学研究设计院绿色建筑与装配式建造安徽省重点实验室,安徽合肥230031 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]福建工程学院土木工程学院,福建福州350118

出　　处：《华中科技大学学报（自然科学版）》2023年第7期77-83,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(52178161,51608433);绿色建筑与装配式建造安徽省重点实验室课题(2021-JKYL-001);安徽建工集团项目(2021-19JF).

摘　　要：基于3个典型焊接钢框架梁柱节点的抗倒塌试验,验证抗倒塌分析准确性.提出半跨梁简化分析模型,研究损伤断裂模拟;给出双重断裂节点构造及其关键参数确定方法,并在模拟方法基础上,分析双重断裂节点的抗连续倒塌性能.结果表明:损伤断裂参数仅影响峰值荷载点位置,考虑应力三轴度,峰值荷载及对应位移平均下降15.7%和22.2%.双重断裂节点构造简单、力学原理清晰,通过增设松弛钢索及配合锚固部件能够实现双重断裂过程.为防止节点两侧钢梁变形不对称,钢索在节点域应不连续.双重断裂节点可以形成较强的二次拉结作用,进而充分发挥钢梁拉结能力.Three anti-collapse tests of typical welded joints were adopted to validate the anti-collapse analysis.A simplified halfspan beam was proposed to study damage and fracture simulation.Finally,a double-fracture joint and the determination method of its key parameters were presented.Based on previous simulation method,the progressive collapse resistance of the double-fracture joints was analyzed.The results showed that the damage and fracture parameters only affect the position of peak load point.Considering stress triaxiality,the peak load and corresponding displacement decreased by 15.7%and 22.2%.The double-fracture joint possessed simple constitution and clear mechanical performance.The double-fracture process can be realized by adding relaxed cables and anchoring components.To avoid asymmetric deformation of the steel beams,the cables should be discontinuous in the joint region.The double-fracture joints can form a strong secondary tensile effect to fully utilize tension capacity of the steel beam.

关 键 词：钢框架 梁柱节点 连续倒塌 损伤断裂 钢索 

分 类 号：TU391[建筑科学—结构工程]