作　　者： ; ; ; ;

机构地区： 广州大学

出　　处： 《土木工程学报》 2010年第9期77-87,共11页

摘　　要： 基于＂核心单元局部削弱相当于其他部位加强＂的新型防屈曲耗能支撑设计原理,设计6种不同构造的三重钢管防屈曲耗能支撑,每种支撑制作3~4个模型共22个支撑模型,对其进行低周反复加载试验,得到每个支撑模型在试验过程中的关键现象和力-位移滞回曲线,并研究核心单元钢管开孔类型、开孔位置数量以及钢管间的缝隙大小对支撑性能的影响。研究结果表明：三重钢管防屈曲耗能支撑核心单元钢管开孔可以减小支撑的屈服位移和屈服荷载,且开孔对支撑的承载力、耗能系数和等效黏滞阻尼比基本没有影响,用普通钢材实现了低屈服点钢的性能;核心单元钢管开孔可以使支撑具有定点屈服的功能,既明确了设计目标,又简化了设计和构造,避免了支撑端部加强制作工序,且开多排孔时可以起到分散钢管变形的作用,开孔式三重钢管防屈曲耗能支撑比不开孔支撑具有更加优良的性能。 Six types of triple-steel tube Buckling-Restrained Brace（BRB） were designed,according to the philosophy of ＂partially weaken the core element of the BRB to protect the other part＂.Low-cycle reverse loading tests are carried out for twenty-two BRBs,and key phenomenon and force-displacement curves are obtained from each BRB test.The influences of the perforation form,perforation position,perforation number,and gap size between the steel tubes of the BRB to the performance of the BRB are studied.Results show that because the core is perforated the yield displacement and yield load of the BRB are decreased,and there is little influence of the perforation to the bearing capacity,energy dissipation coefficient,and equivalent damping ratio of the BRB.Because of the perforation the deformation of the core steel tube can be preset,this does not only specifies the design objective,but also simplifies the design process and construction,which can avoid the manufacturing process to strengthen the ends of the core steel tube.The tube deformation is dispersed when the core has multi-row perforations.The perforation-type triple-steel tube BRB performs better than the non perforation-type triple-steel tube BRB.

关 键 词： 三重钢管 防屈曲耗能支撑 开孔 定点屈服 滞回性能

领　　域： [建筑科学]