提出了一种基于柱座式的装配式方钢管柱-桁架梁连接节点，以实现现场高效率、高精度的层装配式钢结构建筑的建造。该节点主要由柱座、带法兰方钢管柱和桁架梁等组成，其中柱座与桁架梁在工厂完成焊接，现场通过高强度螺栓将柱座与上下柱完成装配。为了研究该新型节点的抗震性能，对三个足尺十字形方钢管柱-桁架梁连接试件进行了滞回加载试验，考察了各试件的破坏模态，评估了梁柱截面尺寸及轴压比对滞回曲线、极限承载力、延性、耗能能力和刚度退化等抗震性能指标的影响规律。试验结果表明：三个试件均表现出良好的抗震性能，各个试件的破坏均始于桁架梁弦杆或腹杆的局部屈曲，结束于桁架梁弦杆或腹杆的开裂；柱壁厚及桁架梁弦杆厚度对试件的承载能力和初始刚度均有显著影响，而轴压比对试件的抗震性能影响较小。加载过程中所有试件的柱座并未发生破坏、法兰板之间无明显滑移，且柱座与桁架梁之间的裂缝未出现撕裂现象，满足“强节点,弱构件”的抗震设计原则。
Abstract
A prefabricated square steel tube column-truss beam connection node based on column seat type is proposed to realize the construction of high-efficiency and high-precision layer prefabricated steel structure building on site. The connection is mainly composed of column base, square steel tube column with flange and truss beam. The column base and truss beam are welded in the factory, and the column base is assembled with the upper and lower columns through high-strength bolts on site. In order to study the seismic performance of the new joint, the hysteresis loading test of three full-foot cross-shaped square steel tube column-truss beam connection specimens was carried out, the failure mode of each specimen was investigated, and the influence of parameters such as beam-column section size and axial compression ratio on seismic performance indicators such as hysteresis curve, ultimate bearing capacity, ductility, energy dissipation capacity and stiffness degradation was evaluated. The test results show that the three specimens show good seismic performance, and the failure of each specimen begins with the local buckling of the truss beam chord or web rod and ends with the cracking of the truss beam chord or web rod. The column wall thickness and truss beam chord thickness have a significant influence on the bearing capacity and initial stiffness of the specimens. During the loading process, there was no damage on the column seats of all specimens, no obvious slippage between the flange plates, and no tearing phenomenon between the column base and the truss beam, which satisfies the seismic design principle of “strong connections and weak components”.
关键词
方钢管柱 /
桁架梁 /
十字形节点 /
抗震性能 /
滞回试验
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Key words
Square hollow section column /
truss beam /
Cross connections /
seismic behavior /
cyclic test
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