摘要
提出了一种采用T型钢连接的可拆换钢梁,在地震作用下T型钢集中耗散地震能量,并在震后通过更换T型钢实现使用功能的恢复。通过合理设计T型钢连接、钢梁中间段和悬臂段的抗弯承载力关系,定义设计承载力削弱系数的取值范围,从而实现T型钢集中损伤耗能,钢梁中间段和悬臂段保持弹性的屈服机制。为了使T型钢连接件实现预期的损伤和最优的耗能效果,设计了4个腹板采用不同截面和材料的T型钢连接件,并对T型钢连接的可拆换钢梁试件进行了低周往复加载试验和有限元分析。结果表明:T型钢连接的可拆换钢梁可以实现预期的屈服机制,达到T型连接件集中耗能的目的;T型钢腹板的残余变形和螺栓应力可以满足拆换条件,拆换后结构功能不变,实现了较为理想的可更换机制。狗骨式腹板截面的T型钢连接件塑性变形更均匀,耗能区域更大,耗能效率提高约30%,拆换时间和残余变形与普通截面相差不大,建议腹板采用狗骨式截面;采用低屈服点钢材可以提高T型钢的耗能效率约40%,在设计承载力系数取值合理的情况下,T型钢腹板可以选择低屈服点钢材。最后,基于试验和有限元结果,考虑到T型钢连接件的可拆换性和钢梁材料利用率,建议设计承载力削弱系数取值为0.65~0.85。
Here,a kind of demountable and replaceable steel beams connected by T-shaped steel was proposed.T-shaped steel could concentratively dissipate seismic energy under earthquake action,and structural functional recovery could be realized by replacing T-shaped steel after earthquake.By reasonably designing flexural bearing capacity relations among T-shaped steel connection,the middle segment and cantilever segment of the steel beam,the allowable range of weakening coefficient of design load-bearing capacity was defined to realize the yield mechanism for concentrated damage energy dissipation of T-shaped steel and keeping the elasticity of the middle segment and cantilever segment of the steel beam.In order to realize the expected damage and the optimal energy dissipation effect of T-shaped steel connectors,4 T-shaped steel connectors were designed with different cross-sections and materials for web.Low cycle reciprocating loading tests and finite element analyses were conducted for demountable and replaceable steel beam specimens connected with T-shaped steel.The results showed that demountable and replaceable steel beams connected by T-shaped steel can realize the expected yield mechanism to reach the goal of concentrated energy dissipation of T-shaped connectors;residual deformation and bolt stress of T-shaped steel web can satisfy detachment and replacement conditions,and the structural function remains unchanged after detachment and replacement,which indicates that the desirable replaceable mechanism is achieved.Plastic deformations of T-shaped steel connectors with dog bone type web cross-section are more uniform,energy dissipation area is larger,and energy dissipation efficiency increases by about 30%,replacement time and residual deformation are not obviously different from those with ordinary cross-sections,so it is recommended to use dog bone type web cross-section for web.Using low yield point steel can improve energy dissipation efficiency of T-shaped steel by about 40%;when the design load-bearing capacit
作者
门进杰
张谦
李家富
王家琛
张辉煌
徐超
MEN Jinjie;ZHANG Qian;LI Jiafu;WANG Jiachen;ZHANG Huihuang;XU Chao(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;MCC Capital Engineering&Research Incorporation Limited,Beijing 100176,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第7期115-125,143,共12页
Journal of Vibration and Shock
基金
国家自然科学基金(52178160,51878542)
国家重点研发计划国际合作重点专项项目(2019YFE0112900)
陕西省教育厅重点科学研究计划项目(21JY023)。
关键词
可拆换钢梁
T型钢连接件
屈服机制
抗震性能
可拆换性能
demountable and replaceable steel beams
T-shaped steel connectors
yielding mechanism
seismic performance
demountability and replaceability
