钢梁拼接节点作为耗能器框架结构滞回性能.docx

摘 要
钢梁拼接节点采用标准化施工,能够有效地提高梁-柱连接节点的施工质量。如果将拼接节点设计的弱些并作为耗能器,则可利用拼接板件间滑移和栓杆与孔壁的挤压来耗散地震能量,提高结构的抗震性能。本文即对钢梁拼接节点作为耗能器的框架结构进行滞回性能研究。
根据钢框架的不同设计目标,本文设计了 17 个用于模拟分析的带有钢梁拼接节点的框架。在以往试验和拼接节点弯矩-转角模型的基础上,对弯矩-转角模型进行修正并提出了新的划分标准。将修正后的模型赋予框架中的拼接单元,对框架进行单向静力加载和循环加载,得到了加载点处单向加载曲线和滞回曲线。分析结果表明:拼接节点作为耗能器,其位置应当设置在 — 倍的梁高之间; 节点滑移荷载可取在设防地震下的拼接截面最不利组合弯矩值附近;在保证框架屈服荷载和极限承载能力的基础上,通过调节螺栓滑移荷载,使拼接节点在强震下产生滑动并耗散地震能量,能够显著增强结构的抗震性能,而且拼接越弱、拼接处变形越大,结构耗能能力越强。
最后给出了钢梁拼接节点作为耗能器的框架结构抗震设计算例。
关键词:拼接耗能节点;M-θ模型;滞回曲线;抗震性能。
Abstract
Steel beam-to-column connection with cantilever beam splicing using standardization construction can effectively improve the quality of connection. If high-strength bolt splice joint is designed not stronger, the slip between faying surfaces and the bearing of bolts to hole surfaces can be used to absorb earthquake energy. The hysteretic behavior of the frame is studied.
According to different design objectives of the steel frame, this paper established
seventeen splice frames used for finite element analysis. Based on experimental study and moment-rotation model of splice joint, modified moment-rotation model is proposed. Hysteretic models are used to define property of link element. Through analysis of static loading and cyclic-loading, the load-displacement and hysteretic curve is obtained. The result of the study shows that the position of the energy-dissipated splice joint should be between one times to two times the height of the beam. Slip load can near the most unfavorable value of the design earthquake. In the basis of guarantee of the yield load and the ultimate bearing capacity, by adjusting the bolt slip bearing capacity and dissipate the earthquake energy can significantly enhance the seismic behavior of structures.
Finally, a design example on steel frame using energy-dissipated splice joints is given.
Keywords: Energy-dissipated splice joint; Moment-rotation model; Hysteretic model; Seismic behavior.
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