预应力方套管连接胶合木梁柱节点抗弯试验

Rotational Performance of PreStressed MultiBolted Glulam Connection with Square Tubes

摘要:

提出在胶合木结构中采用预应力方套管螺栓连接，该连接采用高强螺栓和钢套管作为连接件.通过单调加载和往复加载下的梁柱节点抗弯试验，对比了方套管节点和传统螺栓群连接节点的破坏模式、弯矩转角曲线、滞回曲线、强度、刚度和耗能性能.结果表明，由于摩擦阶段钢管与钢板间的摩擦力确保了初始传力，套管节点的初始转动刚度显著提升，耗能能力也得到改善.

关键词:胶合木结构; 方套管螺栓连接; 预应力; 摩擦; 刚度

Abstract:

This paper presents an experimental study on the moment resisting capacity and stiffness of the proposed prestressed bolted connection. Highstrength bolts with square tubes were used as fasteners in such connections. Two groups of experimental tests were conducted with Tshaped glulam beamtocolumn connections at monotonic and reversed cyclic loading. The failure mode, momentrotation curve, strength, stiffness and energy dissipation property of the prestressed bolted connections with square tubes were obtained and compared with those of traditional bolted connections. The results show that the initial rotational stiffness of prestressed bolted connection increases significantly as a result of the friction between steel tubes and steel plate at the friction stage, and the energy dissipation capacity of prestressed bolted connection is also improved.

Key words:glulam structure; multibolted connection with square tubes; prestress; fraction; rotational stiffness