摘要
提出了一种新型变截面可更换耗能梁段,通过扩大截面并与非耗能构件采用全螺栓等强连接,不仅使耗能区域的塑性变形更易集中,而且螺栓拼接更易于保证弹性设计。为了研究变截面可更换耗能梁段的抗震性能,试验设计了3种不同形式的变截面可更换耗能梁段,分别为低屈服点LYP160钢耗能区域无削弱试件LYP-VRL,Q235钢耗能区域开洞试件C-VRL,Q235钢耗能区域开长圆孔试件LC-VRL,采用拟静力试验方法考察耗能梁段的抗震性能。研究结果表明:塑性变形基本集中在耗能区域内,耗能区域内孔洞周边的鼓曲、撕裂成为主要的破坏特征。低屈服点钢试件超强系数超过3.0,其滞回曲线饱满,耗能性能优越,塑性转角达0.18 rad。长圆孔试件具有较大的超强系数和塑性变形能力,但是由于截面削弱,其耗能能力较差;开圆洞试件的初始弹性刚度与低屈服点钢试件接近,均比开长圆洞试件高约84%。研究结果将为变截面可更换耗能梁段的应用提供参考依据。
This paper presents a novel type of replaceable shear link with a variable cross-section.The proposed design involves expanding the cross-sectional area and employing fully bolted connections to the non-energy-dissipating components.This design approach not only facilitates the concentration of plastic deformation within the energy-dissipating region but also ensures easier implementation of elastic design due to the bolted connections.To assess the seismic performance of the variable cross-section replaceable link,three distinct section configurations were designed for cyclic loading tests:a low-yield-point(LYP160)specimen without weakening in the energy-dissipating region,a Q235 ordinary steel specimen with an opening in the energy-dissipating region,and an ordinary steel specimen with a long oval opening in the energy-dissipating region.Through the cyclic loading tests,the seismic performance of the replaceable shear link was examined thoroughly.The experimental results indicate that plastic deformation primarily occurs within the energy-dissipating region,with buckling and tearing observed around the openings in this region as the primary failure characteristics.The low-yield-point specimen exhibits an overstrength coefficient exceeding 3.0,featuring a complete hysteresis curve,superior energy dissipation capacity,and a plastic rotation of 0.18 rad.Although the specimen with elongated openings demonstrates significant overstrength coefficient and plastic deformation capacity,its energy dissipation capability is compromised due to the weakened section.The specimens with circular openings exhibit an initial elastic stiffness similar to that of the low-yield-point steel specimens,surpassing the stiffness of the specimens with elongated openings by approximately 84%.These findings provide valuable insights for applying variable cross-section replaceable links.
作者
李慎
丁琪
杜宁军
李晓蕾
LI Shen;DING Qi;DU Ningjun;LI Xiaolei(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2024年第6期214-226,共13页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金青年基金项目(52108175)。
关键词
变截面可更换耗能梁段
耗能区域
抗震性能
超强系数
塑性变形
variable cross-section replaceable link
energy-dissipating region
seismic performance
overstrength coefficient
plastic deformation
