全钢自复位屈曲约束支撑理论数值分析.pdfVIP

全钢自复位屈曲约束支撑理论与数值分析 曾 鹏 陈 泉 王春林 孟少平 东南大学混凝土及预应力混凝土结构教育部重点实验室，江苏南京210096 摘要：为控制地震作用下框架结构的最大层间位移和残余变形，给出一种基于全钢屈曲约束支撑的自复位耗能支 撑的设计思路。这种自复位屈曲约束支撑采用预应力钢绞线作为自复位系统，所以被称为全钢自复位屈曲约束支 撑。为克服预应力钢绞线极限弹性变形的限定，给出一种串联两束预应力筋的设计构造。理论分析表明：这种串 联两束预应力筋自复位系统使得自复位屈曲约束支撑的轴向变形是单束预应力钢绞线作为自复位系统时的两倍； 同时指出，预应力筋的初始预张力应大于给定值，才能够保证自复位屈曲约束支撑的性能；根据上述分析同时给出 了一种可能的全钢自复位屈曲约束支撑的设计方案；数值模拟表明减小自复位屈曲约束支撑核心板屈服段的长度 可以提高支撑的耗能能力。 关键词：全钢屈曲约束支撑；自复位系统；残余变形；钢绞线 TU352.1;TU391 A Theoreticalandnumericalinvestigationsonanall-steelself-centering buckling-restrainedbrace ChenQuan WangChunlin MengShaoping KeyLaboratoryofConcreteandPrestressedConcreteStructuresoftheMinistryofEducation,SoutheastUniversity,Nanjing210096,China Abstract:Anewself-centeringenergy-dissipativebraceisdevelopedbasedontheall-steelbuckling-restrainedbraceto controlmaximumandresidualdriftofframestucturessubjectedtoseveralearthquakes.Thisenergy-dissipativebrace employsthesteelprestressingtendonsastheself-centeringsystem.Therefore,itiscalledtheself-centeringall-steel buckling-restrainedbraceinthispaper.Toovercomethelimitationofelasticdeformationoftheprestressingtendons,an enhanced-elongationdual-tendonsystemhasbeendesigned.Theoreticalstudyshowsthatthisdual-tendonsystemallows forElf-centeringresponseovertwotimestherangeachievedwiththeoriginalself-centeringsystemwiththeprestressing tendon.Furthermore,whentheinitialprestressingforceislargerthanthegivenvalue,theperformanceoftheserf- centeringbuckling-restrainedbracecanbeachieved.Basedonthediscussion,onepossiblerealizationofthissystem, whichcombinesthemeritsofbothself-centeringdevicesandbuckling-restrainedbraces,ispresented.Numericalresults showsthatifthelengthoftheyieldingsegmentofthecorebraceisdecreased,theperformanceoftheself-centeringBRB isimproved. Keywords