高强度钢材板式加强型梁柱节点抗震性能和设计方法研究

The high strength steel has been applied in many projects all over the world, but there has been little research on the high strength steel beam-to-column connections. Also, learning from the damages of the American Northridge Earthquake, new beam-to-column connection configurations should be applied in the seismic steel frames to avoid brittle failure. The plate-reinforced beam-to-column connection is a new connection form that has good application prospects, but currently there has been little research on the seismic performance of this connection form. Considering the mechanical characteristics of plate-reinforced connections and the material properties of high strength steel, this project will conduct cyclic loading experiments on full scale high strength steel plate-reinforced connection specimens, develop numerical models to accurately simulate the constitutive model of high strength steel and the configuration parameters of plate-reinforced connections, and deeply investigate the seismic behavior, e. g. resistance, stiffness, ductility, etc, of this connection form and the influence of high strength steel constitutive properties and connection configuration parameters. Based on the research, the ductility evaluation method and index of this connection form will be proposed, a seismic design theory and the calculation method of high strength steel plate-reinforced beam-to-column connections will be proposed, and the corresponding formulae will be put forward. This research topic is based on the long-term research work of the applicant on high strength steel structures and steel beam-to-column connections, and is of high scientific value and innovation. This research will be significant and helpful to improve current steel structure seismic design theory and the connection design method, generalize innovative seismic connection form, promote the application of high strength steel structures, develop low-carbon economics and protect the environment.

高强钢已在国内外多个工程中得到应用，但对高强钢梁柱节点的研究很少；北岭地震震害表明抗震钢框架需采用新型梁柱节点以避免脆性破坏，板式加强型节点是应用前景较好的新型节点，但目前对其抗震性能的研究很少。本项目考虑板式加强型节点的受力特点和高强钢的材料特性，开展高强度钢材板式加强型节点足尺试件循环加载试验，发展可准确模拟高强钢本构关系及节点构造参数的数值模型，深入研究此类节点的承载力、刚度、延性等性能以及受高强钢本构关系和节点构造参数的影响，提出此类节点的延性评价方法和指标，建立高强度钢材板式加强型梁柱节点抗震设计理论和方法，提出计算公式。本项目基于申请人长期从事高强钢结构和钢结构节点研究工作，具有重要科学价值、创新性和应用前景，对于完善我国钢结构抗震设计理论和节点设计方法、推广新型抗震节点形式、促进高强钢结构的应用、保护环境以及发展低碳经济目标的实现，都具有前瞻性理论意义和应用价值。

高强度钢材钢结构是钢结构的重要发展趋势之一。可靠的梁柱连接节点是充分发挥高强度钢材强度优势、保证高强度钢材钢结构抗震性能的重要前提。项目以应用前景较好的高强度钢材板式加强型梁柱节点为研究对象，取得的主要研究成果如下：.（1）开展了8个盖板加强型和8个翼缘板加强型足尺梁柱节点试件的循环加载试验，考虑Q345、Q460两种强度钢梁与Q345、Q460、Q890三种强度钢柱的不同组合，变化加强系数、节点域强度系数等节点构造参数，分析了各试件的失效模式、承载力、刚度、耗能能力及节点域的力学性能，基于最大层间位移角、塑性层间位移角和延性系数评价了不同试件的延性。.（2）建立了可准确考虑节点主要构造参数的高强度钢材板式加强型梁柱节点的有限元模型，利用试验结果验证了有限元模型的准确性和可靠性，完成了52个盖板加强型节点和56个翼缘板加强型节点的有限元参数分析，得到了不同钢材组合和构造参数条件下板式加强型梁柱节点的力学性能指标；提出了剪切板剪力反转现象，建议设计中对加强板进行弯剪综合作用下的强度验算。.（3）基于试验和有限元结果讨论了现有的梁柱节点设计方法对高强度钢材板式加强型梁柱节点的适用性，提出了高强度钢材板式加强型梁柱节点的设计方法，包括：构造建议、刚度计算、承载力验算以及抗震设计。所提出的设计方法可为高强度钢材板式加强型梁柱节点在抗震设计中的应用提供参考。.（4）提出了翼缘焊接梁柱节点的弯矩-节点域剪切转角曲线模型和考虑节点域变形的钢框架分析模型，编制了使用平行四边形模型、剪刀模型和柱侧弹簧模型考虑节点域变形的计算程序，通过算例分析对比了不同模型的计算结果，分析了在高强度钢材钢框架设计中考虑节点域变形影响的必要性，提出了在钢框架分析中考虑节点域变形的实用方法。