CAJ | 학술논문

由于防屈曲支撑（Buckling-restrained brace，BRB）利用低屈服点芯材轴向受压、受拉屈服耗能，若置于钢筋混凝土桥梁排架中，通过合理设计使其先于排架屈服并耗能，可减少排架本身的地震损伤，且其破坏后易于更换、起保险丝的作用。为此，初步发展利用BRB实现桥梁排架基于保险丝理念的抗震设计方法，通过拟静力、增量动力分析手段对BRB减小排架地震损伤效果进行验证。结果表明，BRB核心段长度为影响排架屈服顺序关键，BRB先于桥梁排架构件发生屈服并消耗地震能量，因此能提高桥梁排架强度及刚度，延缓排架本身屈服过程，减少变形。
유우방굴곡지탱（Buckling-restrained brace，BRB）이용저굴복점심재축향수압、수랍굴복모능，약치우강근혼응토교량배가중，통과합리설계사기선우배가굴복병모능，가감소배가본신적지진손상，차기파배후역우경환、기보험사적작용。위차，초보발전이용BRB실현교량배가기우보험사이념적항진설계방법，통과의정력、증량동력분석수단대BRB감소배가지진손상효과진행험증。결과표명，BRB핵심단장도위영향배가굴복순서관건，BRB선우교량배가구건발생굴복병소모지진능량，인차능제고교량배가강도급강도，연완배가본신굴복과정，감소변형。
Buckling-restrainedbrace(BRB)madeoflowyieldstrengthsteelisanenergydissipationdamper, which can yield in tension and compression without buckling.BRB added to an RC bridge bent will yield and dissipate seismic energy prior to the bent itself with reasonable design,and the seismic risk to the bent will be decreased.The damaged BRB can be easily replaced and is designed as a structural fuse.A preliminary seismic design method based on the structural fuse concept was proposed,and the seismic damage control effect of BRB on the bent was verified by quasi-static and incremental dynamic analysis.It is found that the length of the BRB core is the key influencing factor on the yield sequence of the bent.A properly designed BRB would yield before the bent and dissipate most of the seismic energy through hysteretic behavior of the fuse while avoiding damage to the bent itself.The strength and lateral stiffness of the bent are improved,and the yielding of the transverse beam and pier is delayed.Also,the deformation demand of the bent is decreased by using BRB.