刘红波^{1, 2}，刘晓娜²，孟祎²，陈志华^{1, 2}
AuthorsHTML:刘红波^{1, 2}，刘晓娜²，孟祎²，陈志华^{1, 2}
AuthorsListE:Liu Hongbo^1,2，Liu Xiaona ²，Meng Yi²，Chen Zhihua ^1,2
AuthorsHTMLE:Liu Hongbo^1,2，Liu Xiaona ²，Meng Yi²，Chen Zhihua ^1,2
Unit:1. 滨海土木工程结构与安全教育部重点实验室(天津大学)，天津 300072；
2. 天津大学建筑工程学院，天津 300072
Unit_EngLish:1. Key Laboratory of Coast Civil Structure and Safety of Ministry of Education(Tianjin University)，Tianjin 300072，China；
2. School of Civil Engineering，Tianjin University，Tianjin 300072，China
Abstract_Chinese:板式节点是铝合金空间网格结构中应用最为广泛的节点形式，其力学性能会对铝合金空间网格结构的承载性能产生显著影响．目前，针对铝合金板式节点力学性能的研究主要集中在单层板式节点，双层板式节点作为一种新型节点形式，其力学性能及设计方法尚待研究．本文在试验的基础上，分别对单层和双层板式节点的力学性能进行了数值分析和理论分析，并运用ABAQUS软件建立了大量节点模型进行参数化分析，考虑了腹板厚度、腹板高度、节点板厚度、翼缘板厚度、翼缘板宽度及螺栓布置形式对单层和双层板式节点力学性能的影响．基于破坏线理论和螺栓破坏理论，引入材料等效强度破坏系数和双层铝合金板式节点极限承载力增强系数，提出了节点极限承载力的计算方法．研究结果表明：单层和双层板式节点的极限承载力随着节点板厚度的增加，先增大后减小；腹板越厚越高、翼缘板越厚越宽，单层和双层板式节点的极限承载力越高；双层板式节点极限承载力高于单层板式节点，根据计算分析建议双层板式节点极限承载力增强系数取2.3；螺栓布置对节点力学性能影响显著；理论计算结果与数值计算结果吻合程度较好，验证了理论计算方法的准确性，可为实际工程应用提供依据．
Abstract_English:Gusset joints are most widely used in aluminum alloy spatial grid structures，and their mechanical properties have a significant effect on the bearing capacities of aluminum alloy spatial grid structures. At present，research on the bearing capacity of aluminum alloy gusset joints focuses on single-layer gusset joints. As a new type of joint，the mechanical properties and design methods of double-layer gusset joints still need to be investigated. In this study，on the basis of experiments，theoretical analysis and numerical simulation of the mechanical properties of single and double-layer aluminum alloy gusset joints were conducted. A large number of joint models were established using the ABAQUS software for parametric analysis. The effects of certain parameters such as the thickness of the web，height of the web，thickness of the flange plate，thickness of the gusset plate，width of the flange plate，and layout of the bolts on the mechanical properties of single and double-layer gusset joints were considered. On the basis of the theories of failure lines and bolt failures，the equivalent strength failure coefficient and the ultimate bearing capacity strengthening coefficient of double-layer gusset joints were introduced and the calculation methods of the ultimate bearing capacity of joints were proposed. Results showed that the ultimate bearing capacity of the two kinds of joints initially increases and subsequently decreases with the increase of the thickness of the gusset plate. The thicker and higher the web and the thicker and the wider the flange plate are，the higher the ultimate bearing capacity of single and double-layer aluminum alloy gusset joints. The ultimate bearing capacity of double-layer gusset joints is higher than that of single-layer gusset joints. According to the analysis and calculation，the recommended value of the ultimate bearing capacity strengthening coefficient of double-layer gusset joints is 2.3. The layout of the bolts has a significant effect on the mechanical properties of joints. The theoretical calculation results are consistent with the numerical calculation results，which verifies the accuracy of the theoretical calculation methods and provides a basis for practical engineering application.
Keyword_Chinese:铝合金板式节点；双层板式节点；力学性能；设计方法
Keywords_English:aluminum alloy gusset joint；double-layer gusset joint；mechanical property；design method

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