本文選題：防屈曲耗能支撐 + CFRP　； 參考：《東南大學》2016年碩士論文

【摘要】：防屈曲耗能支撐(BRB)是高層建筑耗能減震的常用構件,全鋼型BRB由于其制作簡單、組裝方便,目前應用非常廣泛,其中一字型截面是最常用的截面形式之一。但試驗研究表明,一字型截面形式的全鋼型BRB目前還存在以下問題：承載性能不足,特別是外約束剛度較小時,內芯易發(fā)生多波整體屈曲,導致受壓性能較差；耗能性能不足,內芯截面在拉壓過程中易形成薄弱點,內芯端部區(qū)域易過早發(fā)生低周疲勞破壞,進而影響其耗能性能。為彌補上述不足,作者首次提出了采用碳纖維增強復合材料(CFRP)-鋼組合板作為內芯的新型BRB, CFRP-鋼組合板是由鋼板和粘貼于其表面的CFRP布組成。本文對新型CFRP-鋼組合內芯BRB進行了性能研究。首先對新型CFRP-鋼組合內芯BRB進行了擬靜力滯回性能試驗研究。試驗分為兩組,分別為外約束剛度較強的組裝式防屈曲耗能支撐(ABRB)和外約束剛度較弱的鋼管式防屈曲耗能支撐(SBRB),每種構件均設計了相應的普通全鋼型BRB作為對比構件。根據試驗結果,分別對兩種不同形式的BRB從破壞模式、滯回性能、承載力性能、塑性變形性能和剛度等方面進行了比較分析。試驗分析結果表明,對于外約束剛度較強的ABRB,采用CFRP-鋼組合板作為內芯能夠使其屈曲變形沿縱向分布更均勻,截面受力也更均勻,對于其滯回耗能性能、承載力性能、塑性變形性能及剛度等方面均有較高的提升,并且這些性能的提升主要集中在內芯進入塑性變形階段,而CFRP布未完全剝離或被拉斷；對于外約束剛度較弱的SBRB,采用CFRP-鋼組合板作為內芯也能夠對其滯回性能、承載力性能、塑性變形性能及剛度有一定程度的提升,但不能解決鋼管式BRB的本質缺陷問題。其次利用通用有限元軟件ABAQUS建立了兩種新型CFRP-鋼組合內芯BRB及對應的全鋼型BRB的有限元模型。對內聚力單元做了詳細的介紹,建立了鋼板-膠層-CFRP布的有限元模型,并對有可能影響有限元數(shù)值模擬結果的各種因素進行了討論。將有限元數(shù)值模擬得到的構件試驗過程和實際試驗現(xiàn)象、滯回曲線進行對比分析,發(fā)現(xiàn)本文建立的有限元模型對兩個ABRB構件以及普通鋼板內芯的SBRB-1構件的試驗過程和滯回性能模擬吻合較好,證明了本文建立的有限元模型具有良好的可靠性和適用性,可以作為參數(shù)化研究新型CFRP-鋼組合內芯BRB性能的有力輔助手段。
[Abstract]:Buckle-proof energy dissipation braces (BRB) are commonly used in high rise buildings. Due to their simple fabrication and convenient assembly, the all-steel BRB is widely used, one of which is one of the most commonly used cross-sections. However, the experimental results show that there are still some problems in the single-section BRB, such as insufficient bearing capacity, especially when the external restraint stiffness is small, the inner core is prone to multi-wave integral buckling, which leads to poor compression performance and insufficient energy dissipation. The inner core cross section is easy to form a weak spot in the process of tension and compression, and the low cycle fatigue failure occurs prematurely in the inner core end region, thus affecting its energy dissipation performance. In order to make up for these shortcomings, a new type of BRBs with carbon fiber reinforced composite (CFRP) steel composite plate as inner core is proposed for the first time. CFRP- steel composite plate is composed of steel plate and CFRP cloth attached to its surface. The performance of a new type of CFRP-steel composite core BRB is studied in this paper. First, the quasi-static hysteretic behavior of new CFRP- steel composite core BRB is studied. The test is divided into two groups, one is assembled anti-buckling energy dissipation bracing (ABRB) with strong external restraint stiffness, the other is steel tube anti-buckling energy dissipation bracing (SBRB) with weak external restraint stiffness. According to the experimental results, the failure modes, hysteretic properties, bearing capacity, plastic deformation properties and stiffness of two different BRB forms are compared and analyzed respectively. The experimental results show that the CFRP- steel composite plate can make the buckling and deformation distribution along the longitudinal direction more uniform, and the stress on the cross section is more uniform for ABRBs with strong external restraint stiffness. For the hysteretic energy dissipation performance, the bearing capacity of ABRBB can be improved by using CFRP- steel composite plate as inner core. The plastic deformation properties and stiffness of CFRP cloth are improved, and the improvement of these properties is mainly concentrated in the core into the plastic deformation stage, but the CFRP cloth is not completely peeled or broken; For SBRBs with weak external restraint stiffness, CFRP- steel composite plate can improve the hysteretic performance, bearing capacity, plastic deformation performance and stiffness to some extent, but it can not solve the intrinsic defect of BRB. Secondly, two new CFRP- steel composite core BRB and corresponding full steel BRB finite element models are established by using the general finite element software Abaqus. The cohesion element is introduced in detail, the finite element model of plate-rubber layer CFRP cloth is established, and various factors which may affect the numerical simulation results of finite element are discussed. The experiment process of finite element numerical simulation is compared with the actual experimental phenomenon, and the hysteresis curve is compared and analyzed. It is found that the finite element model established in this paper is in good agreement with the experimental process and hysteretic performance simulation of two ABRB members and SBRB-1 members with common steel core. It is proved that the finite element model established in this paper has good reliability and applicability. It can be used as a parameterized means to study the BRB properties of new CFRP- steel composite cores.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TU398.9

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