摘要
为研究高强钢外伸端板加劲螺栓连接节点的抗震性能和设计方法,基于EC3规范组件法和同步塑性设计理念,设计了3种不同屈服机制的Q690高强钢外伸端板加劲螺栓连接节点,通过循环加载试验研究了节点的破坏模式、刚度和承载力、耗能能力以及应变分布规律等,进一步验证了节点能力设计计算模型的有效性。研究结果表明:高强钢外伸端板加劲螺栓连接超强节点的能量耗散区主要集中在梁翼缘削弱区域,等强节点的能量耗散区主要分布于端板连接处以及梁翼缘削弱区域,两种节点均属于延性破坏模式;欠强节点仅依靠端板与梁翼缘间的焊缝裂纹不断扩展和闭合以及有限的端板塑性变形耗散地震能量,属于脆性破坏模式;高强钢外伸端板加劲连接节点的破坏模式、屈服机制以及耗能能力等均与节点的能力设计参数密切相关,基于EC3规范组件法的高强钢外伸端板加劲连接节点能力设计计算模型,可较准确地预测节点的破坏模式,但能力设计参数的合理取值有待继续研究。
To study the seismic performance and design method of extended stiffened(ES)end-plate bolted connections using high strength steel(HSS),three Q690 HSS ES end-plate bolted joints with different yield mechanisms were designed based on component method in EC3 code and synchronous plastic design concept.The failure mode,stiffness,bearing capacity,energy dissipation capacity and strain distribution of the joints were studied by low cyclic loading test,and the validity of the capacity design calculation model was further verified.The test results show that the energy dissipation zone of high strength joints is mainly concentrated in the weakened area of the beam flange,while the energy dissipation zone of equal-strength joints is mainly distributed in the end-plate connection and the weakened area of the beam flange,both of which are attributed to the ductile failure mode.The partial-strength joints only rely on the continuous expansion and closure of the weld crack between the end-plate and the beam flange,as well as the limited plastic deformation of the end-plate to dissipate the seismic energy,which is attributed to brittle failure mode.The failure mode,yield mechanism and energy dissipation capacity of the joint are closely related to the capacity design parameters.The capacity design calculation model of the Q690 HSS ES end-plate bolted joint based on the component method in EC3 code could accurately predict the failure mode,but the reasonable parameters need to be further studied.
作者
梁刚
郭宏超
刘云贺
杨迪雄
LIANG Gang;GUO Hongchao;LIU Yunhe;YANG Dixiong(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China;School of Water Resources and Hydropower,Xi’an University of Technology,Xi’an 710048,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2022年第3期57-67,共11页
Journal of Building Structures
基金
国家自然科学基金项目(51978571,51722907)
陕西省自然科学基金项目(2020JQ-628)。
关键词
外伸端板加劲螺栓连接
Q690高强钢
拟静力试验
转动能力
耗能能力
屈服机制
计算模型
extended stiffened end-plate bolted connection
Q690 high strength steel
quasi-static test
rotation capacity
energy dissipation capacity
yield mechanism
calculation model
