方钢管柱内套筒-T型件新型装配式组合节点受力性能研究及设计

Fabricated beam-to-column connection, which is a kind of technology innovation, plays a key role in steel structure of industrial production progress. The project studies on H-beam to square tubular column composite connections with inner-tube and T-stub, which considering combined action effect of profiled sheet-concrete composite slabs. This kind of connection has the advantages of simple configuration, convenient and fast construction, environmental protection, energy conservation and emission reduction, especially there are avoiding the disadvantage of field welds in site as much as possible. Through the methods of experimental investigation, finite element numerical simulation and theoretical analysis, the project achieves the following objectives：the complicated mechanical behavior of composite connections, which considers the effect of key factors, under cyclic loading conditions is studied. The reasonable value range of configuration factors such as sheet thickness and length of inner-tube, thickness of T-flange, diameter of bolts, bolt arrangements are given. Calculation model and simple design methods of composite connections are accumulated through the comprehensive analysis of connections properties. The seismic design configuration details of composite connections have been suggested with comparing of the seismic performance and ductility of connections in different strengthen ways. The above works achieve the goal to accumulate a theoretical basis for H-beam to square tubular column composite connections with inner-tube and T-stub, and lay a foundation for popularization and application the new fabricated composite connections widely.

装配式梁柱连接节点的应用对于钢结构建筑工业化生产起到关键作用，是一种技术创新。本项目针对考虑压型钢板组合楼板共同作用的方钢管柱H型钢梁内套筒—T型件新型装配式组合节点展开研究。该节点构造简单，施工方便快捷，且大大减少焊缝带来不利影响，是一种环保、高效、受力性能良好的连接形式。通过试验、数值模拟及理论分析方法，研究考虑关键因素影响的组合节点复杂的循环加载受力行为，给出内套筒壁厚及长度、T型件翼缘厚度、螺栓直径及布置间距等构造参数合理的取值范围。综合分析连接节点力学特性给出节点计算模型及简化设计方法，比较分析不同加强方式对连接节点抗震性能及延性的改善作用，给出最佳抗震构造设计建议。上述研究工作将积累方钢管柱装配式梁柱组合节点受力性能基础数据资料，为其推广应用奠定理论基础。

方钢管柱内套筒-T型件梁柱连接是一种新型钢结构装配式节点形式，具有装配化程度高、施工速度快、劳动效率高、施工成本低等特点，是一种经济效益良好的新型装配式连接。该节点符合工业化生产的发展趋势，符合我国当前提倡装配式建筑的政策导向，具有广阔的应用前景。.方钢管柱内套筒-T型件梁柱装配式连接节点中内套筒厚度及长度、T型件翼缘厚度及螺栓布置等关键构造参数对连接节点受力性能产生影响，本项目针对方钢管柱内套筒-T型件新型装配式节点及重要传力构件T型件的受力性能进行了试验研究、数值模拟计算和理论分析。主要研究内容有：分析了内套筒厚度、内套筒长度变化对连接节点承载力、滞回性能、耗能能力等力学性能的影响，给出了内套筒厚度、内套筒长度的合理取值范围。针对新型装配式连接中重要的传力构件T型件进行了研究。分析了T型件翼缘厚度、螺栓直径及布置间距等构造参数变化对连接承载力、关键部位应力发展及高强度螺栓受力等性能产生的影响，得出各构造参数最佳取值建议。在试验、数值模拟计算研究结果基础上进行理论分析，提出了高强度螺栓拉力的简化设计公式、高强度螺栓弯矩的半经验公式、高强度螺栓最大应力拟合方程。.项目研究取得了一些有益结论，为方钢管柱内套筒-T型件梁柱新型装配式连接节点推广应用提供了受力特性研究基础，为该新型连接节点构造设计提供了参考。