本文選題：延性交錯桁架 + 雙角鋼組合截面��； 參考：《西安建筑科技大學》2017年碩士論文

【摘要】：混合式交錯桁架結構在往復荷載作用下,常表現為斜腹桿的壓屈或拉斷,結構延性差,課題組提出延性交錯桁架結構體系的概念,即通過合理設計方法將空腹節(jié)間弦桿設計為延性區(qū)段,結構其余部分保持彈性,利用延性區(qū)段屈服耗散地震能量,從而提高結構整體抗震性能。延性區(qū)段弦桿的延性及耗能能力是延性交錯桁架結構抗震設計的關鍵。為研究延性交錯桁架鋼框架雙角鋼組合截面弦桿在延性區(qū)段的抗震性能,對8個雙角鋼組合截面足尺試件進行低周往復加載試驗,考察了填板間距、加勁肋布置及補強鋼板設置等因素對構件滯回性能的影響,同時建立了往復彎曲下雙角鋼組合截面構件恢復力模型。結果表明:減小填板間距可保證雙肢更好協(xié)同工作,提高試件的轉動能力;布置加勁肋并減小其設置間距可有效緩解板件屈曲,提高試件延性及耗能能力;增設補強鋼板可轉移塑性鉸發(fā)生位置,改善試件的延性及轉動能力;同時,角鋼腹板在連接部位過早斷裂的破壞模式致使其延性和耗能能力不足。本文提出的恢復力模型可以良好的表達延性交錯桁架鋼框架雙角鋼組合截面弦桿的承載力及剛度退化等特征,可為結構的彈塑性分析提供參考。研究豐富了延性交錯桁架鋼框架結構抗震性能的研究成果,也為雙角鋼組合截面受彎構件的其他工程應用提供參考。
[Abstract]:The composite staggered truss structure under reciprocating load is usually shown as bending or breaking of inclined web bar, and its ductility is poor. The concept of ductile staggered truss structure system is put forward by our research group. In other words, the hollow Internode chord is designed into ductile section by reasonable design method, the rest of the structure remains elastic, and the seismic energy is dissipated by yielding in the ductile section, thus improving the overall seismic performance of the structure. Ductility and energy dissipation capacity of chord in ductile section are the key to seismic design of ductile staggered truss structure. In order to study the seismic behavior of double angle steel composite section chord of ductile staggered truss frame in ductility section, the low cycle reciprocating loading test was carried out on 8 full-scale specimens with double angle steel composite section, and the spacing of filling plates was investigated. The effects of stiffener arrangement and reinforcement plate setting on the hysteretic behavior of the members are discussed. The restoring force model of the members with double angle steel composite section under reciprocating bending is established at the same time. The results show that reducing the spacing of the fill plate can ensure the joint work of the two legs and improve the rotation ability of the specimens, and the stiffening ribs and the space between the stiffeners can effectively alleviate the buckling of the plates and improve the ductility and energy dissipation capacity of the specimens. The location of plastic hinge can be transferred by adding reinforced steel plate, and the ductility and rotation ability of the specimen can be improved. At the same time, the failure mode of premature fracture of angle steel web leads to insufficient ductility and energy dissipation. The restoring force model presented in this paper can well express the bearing capacity and stiffness degradation of ductile staggered truss steel frame string with double angle steel composite section, which can provide a reference for the elastoplastic analysis of the structure. The study enriches the research results of seismic behavior of ductile staggered truss steel frame structures, and provides a reference for other engineering applications of flexural members with double angle steel composite section.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU391;TU352.11

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本文編號：1987319