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对装配镍钛形状合金的外伸式端板连接进行综合参数研究。数值模拟方法是首先与7个足尺试验结果进行比较和验证。有限元分析结果与试验结果较为一致,尤其在变形模式、应变、弯矩-转角响应、残余变形和等效黏滞阻尼方面比较吻合。之后的有效性研究中,进行包括螺栓排列、螺栓长度、直径、梁-连接强度比、端板厚度、柱腹板变形和抗剪机制的影响在内的参数研究。为了解决参数研究中的主要问题,即剪切滑移,提出一个改进的高强度形状记忆合金的混合解决方案。方法之一是使用配备有可以承受一行螺栓变形的蝶形垫圈的高强螺栓,从而保证连接居中,并提供额外的能量耗散。建立一个详细的有限元模型来验证高强形状记忆合金混合连接的可行性,并提出这种连接的常用设计分析模型。给出在实际应用中使用的一组设计规范,并指出需要进一步研究的问题。
A comprehensive parameter study was conducted on the overhang type end plate connections equipped with NiTi shape alloy. The numerical simulation method is the first to compare and verify with seven full-scale test results. The results of finite element analysis are in good agreement with the experimental results, especially in terms of deformation mode, strain, moment-angle response, residual deformation and equivalent viscous damping. Subsequent validity studies included parametric studies that included the effects of bolt alignment, bolt length, diameter, beam-connection strength ratio, end plate thickness, column web deformation and shear mechanism. In order to solve the main problem in parametric studies, namely shear slippage, an improved hybrid solution of high-strength shape memory alloys is proposed. One way to do this is to use a high-strength bolt fitted with a butterfly washer that can withstand a row of bolt deformations, ensuring that the connection is centered and providing additional energy dissipation. Establish a detailed finite element model to verify the feasibility of high-strength shape memory alloy hybrid connection, and put forward a common design analysis of this connection model. Give a set of design specifications to be used in practical applications and point out the issues that need further study.