新型FRP-钢组合内芯防屈曲耗能支撑性能研究

发布时间：2018-07-10 04:44

本文选题：防屈曲耗能支撑 + CFRP　；参考：《东南大学》2016年硕士论文

【摘要】：防屈曲耗能支撑(BRB)是高层建筑耗能减震的常用构件,全钢型BRB由于其制作简单、组装方便,目前应用非常广泛,其中一字型截面是最常用的截面形式之一。但试验研究表明,一字型截面形式的全钢型BRB目前还存在以下问题：承载性能不足,特别是外约束刚度较小时,内芯易发生多波整体屈曲,导致受压性能较差；耗能性能不足,内芯截面在拉压过程中易形成薄弱点,内芯端部区域易过早发生低周疲劳破坏,进而影响其耗能性能。为弥补上述不足,作者首次提出了采用碳纤维增强复合材料(CFRP)-钢组合板作为内芯的新型BRB, CFRP-钢组合板是由钢板和粘贴于其表面的CFRP布组成。本文对新型CFRP-钢组合内芯BRB进行了性能研究。首先对新型CFRP-钢组合内芯BRB进行了拟静力滞回性能试验研究。试验分为两组,分别为外约束刚度较强的组装式防屈曲耗能支撑(ABRB)和外约束刚度较弱的钢管式防屈曲耗能支撑(SBRB),每种构件均设计了相应的普通全钢型BRB作为对比构件。根据试验结果,分别对两种不同形式的BRB从破坏模式、滞回性能、承载力性能、塑性变形性能和刚度等方面进行了比较分析。试验分析结果表明,对于外约束刚度较强的ABRB,采用CFRP-钢组合板作为内芯能够使其屈曲变形沿纵向分布更均匀,截面受力也更均匀,对于其滞回耗能性能、承载力性能、塑性变形性能及刚度等方面均有较高的提升,并且这些性能的提升主要集中在内芯进入塑性变形阶段,而CFRP布未完全剥离或被拉断；对于外约束刚度较弱的SBRB,采用CFRP-钢组合板作为内芯也能够对其滞回性能、承载力性能、塑性变形性能及刚度有一定程度的提升,但不能解决钢管式BRB的本质缺陷问题。其次利用通用有限元软件ABAQUS建立了两种新型CFRP-钢组合内芯BRB及对应的全钢型BRB的有限元模型。对内聚力单元做了详细的介绍,建立了钢板-胶层-CFRP布的有限元模型,并对有可能影响有限元数值模拟结果的各种因素进行了讨论。将有限元数值模拟得到的构件试验过程和实际试验现象、滞回曲线进行对比分析,发现本文建立的有限元模型对两个ABRB构件以及普通钢板内芯的SBRB-1构件的试验过程和滞回性能模拟吻合较好,证明了本文建立的有限元模型具有良好的可靠性和适用性,可以作为参数化研究新型CFRP-钢组合内芯BRB性能的有力辅助手段。
[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.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU398.9

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