长螺杆加强型胶合木梁柱节点力学性能

Mechanical Properties of Glulam Reinforced Beam-to-Column Connection with Long Steel Rods

摘要:

胶合木梁柱螺栓钢填板节点由于抗弯刚度较低，在结构设计中通常被视为铰接。提出了一种长螺杆加强型胶合木梁柱节点，为无支撑或剪力墙的中高层木结构体系中提供较好的刚性连接。设计并加工了3组不同长螺杆直径的节点试件，通过单调加载和往复加载试验探究了节点的抗弯刚度、抗弯承载力、破坏模式及耗能性能。通过 ABAQUS 有限元软件建立了节点力学模型，模拟结果与试验结果较为吻合，并基于该模型开展了参数分析。结果表明：该节点具有较高的抗弯刚度与抗弯承载力，经过合理构造后节点损伤主要集中在长螺杆，而长螺杆在破坏后易于更换，可提高节点韧性与使用寿命。参数分析结果表明，转动刚度与长螺杆直径及力臂呈正相关。基于试验与模拟的结果，提出了该类节点抗弯刚度及抗弯承载力的计算方法，为其在实际工程中的设计与应用提供参考。

Abstract:

Glulam bolted beam-to-column connections with slotted-in steel plates are usually regarded as hinges in structural design due to their low moment-resisting properties. In this paper， an innovative glulam reinforced beam-to-column connection with long steel rods was proposed， aiming to provide good moment-resistant properties for mid-rise timber frames without braces or infill shear walls. Three sets of specimens with different diameters of long steel rods were designed and manufactured. The stiffness， load-carrying capacities， failure modes， and energy-dissipating capacities of the specimens were analyzed based on the monotonic static loading tests and cyclic loading tests. Finite element models of such connections were developed using ABAQUS. The simulated results were proved to be consistent with the experimental results. Then， a parametric analysis was conducted based on the validated numerical models. The results reveal that the proposed connections have an excellent moment-resistant stiffness and a load-carrying capacity. The damage is mainly focused on the long steel rods following the concept of the connection. Besides， the damaged long steel rods can be replaced after being damaged， extending the seismic resilience and the life span of the proposed connections. The results from the parametric analysis show that the moment-resistant stiffness is positively associated with the diameter and the arm of long steel rods. Finally， based on the experimental and numerical results， a theoretical approach was proposed to estimate the moment-resistant stiffness and load-carrying capacity. The approach proposed provides important reference for the future design of such innovative connections in real projects.