STUDY ON ENERGY ABSORPTION CAPACITY AND FRACTURE OF HAUNCHED BEAMS WITH FRICTION-SLIP DIVICES

本研究的目的是建立加腋轧制H梁与摩擦滑移装置防止脆性断裂对主要的地震攻击.为了明确螺栓摩擦滑动连接的动态迟滞特性和允许胶合的范围，对带槽孔的高强度螺栓摩擦滑动连接进行了动态试验。外板开孔节点的能量吸收能力比内板开孔节点的能量吸收能力大，滞回曲线为刚塑性型，累积滑移变形受螺栓夹紧力和滑移速度的影响较大。提出了一种采用板垫圈和零孔隙主盘的新型摩擦接头，并讨论了标准孔、超大孔和开槽孔高强度螺栓摩擦接头的疲劳性能.为了评估加腋在实际车间制造中的可制造性和可焊接性，制造了底部加腋的全尺寸模型。在拱腰与轧制H型钢的交接处发现了未焊透和焊接缺陷。此外，还对轧制H形截面构件切下的翼缘板进行了抗弯试验。讨论了裂纹的发生对板材弯曲的影响以及塑性弯曲的程度.为了研究加腋轧制H形截面梁的塑性性能，进行了单调加载和低周反复加载试验。加腋梁的变形能力小于等截面梁，且变形能力不受加腋梁的加工性和焊接性的影响。加腋处无加劲肋试件的累积转动承载力小于加横加劲肋试件。

The objective of this study is to create the haunched rolled-H beams with the friction-slip device preventing brittle fracture against a major seismic attack.1. To clarify the dynamic hysteresis characteristics and the permissible region for the scuffing, the dynamic tests were conducted on the high-strength bolted friction-slip joints with the slotted hole. The energy absorption capacity of the joints where the outer plates have the slotted hole is larger than that of the joints where the inner plate has the slotted hole, the hysteresis loop is the rigid-plastic type and the cumulative slip deformation is significantly affected by the bolt clamping force and the slip velocity. And a new friction joint using the plate washers and the main plate with zero hole clearance is proposed and the fatigue properties of the high-strength bolted friction joints with standard, oversized and slotted holes are discussed.2. To evaluate the fabricability and the weldability of the haunch in the actural shop fabrication, the full-size mock-up of the bottom haunch were fabricated. The lack of penetration and the defective welding are found at the intersection of the haunch and the rolled-H section memmber. Furthermore, the bending tests were conducted on the flange plate cut off the rolled-H sectiom member. The occurrence of cracking on the plate bending and the level of plastic bending are discussed.3. To evaluate the plastic behavior if the haunched rolled-H section beams, the monotonic and the cyclic loading tests were carried out. The deformation capacity of the haunched beam is smaller than that of the uniform beam and the deformation capacity is not governed by the fabricability and weldability of the haunch. The cumulative rotation capacity is smaller for the specimen with non-stiffener at the junction of the haunch than for those with transverse stiffener.