钢网格支撑钢框架抗震性能研究
Seismic Performance of Steel Grid Braced Steel Frames
文中提出了一种钢网格支撑钢框架结构,分析了该结构在单调荷载与循环荷载作用下的力学性能。结果表明:单调荷载作用下,钢网格支撑钢框架的承载力较人字形支撑钢框架的承载力提升约50%,初始刚度显著提高;循环荷载作用下,该结构滞回曲线更饱满,耗能系数更高。结构层间位移角小于1/50时,钢梁与支撑连接处的竖向位移较小,最大值为11.35 mm,支撑未发生平面外失稳;层间位移角大于1/50时,钢梁与支撑连接处的竖向位移快速增大。参数分析表明:圆筒节点的肋板高度与厚度对钢网格支撑钢框架的单调加载承载力、滞回承载力、承载力退化水平及耗能系数影响显著,而内、外圆筒厚度的影响相对较小。
In this paper, a steel grid braced steel frame is proposed, and its performance is analyzed under monotonic and cyclic loading. The results show that compared with the chevron-braced steel frame, the bearing capacity of the steel grid braced steel frame is increased by about 50%, and the initial stiffness is significantly increased under monotonic loading. The hysteretic curve of the steel grid braced steel frame is fuller, and the energy dissipation coefficient is higher than that of chevron-braced frame under cyclic loading. When the inter-story drift ratio of the structure is less than 1/50, the vertical displacement at the connection between the steel beam and the brace is relatively small, with a maximum value of 11.35 mm, and the brace has not experienced out-of-plane instability. When the inter-story drift ratio of the structure is greater than 1/50, the vertical displacement at the connection between the steel beam and the brace increases rapidly. The height and thickness of the rib plate at the circular steel tube joints significantly influence the monotonic bearing capacity, hysteretic strength, strength degradation, and energy dissipation coefficient, but the thicknesses of the inner and outer circular steel tubes have little influence.
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国家自然科学基金(52108481)
山西省基础研究计划自由探索类青年基金(202303021212183)
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