ABSTRACT

While Asymmetric Friction Connections (AFCs) have been employed as seismic energy dissipation devices in steel structures, development of design guidance based on robust understanding of their behaviour is required. This paper describes the quasi-static testing of 18 AFCs with Bisalloy 500 shims and 2 M16 Grade 8.8 bolts to quantify the effect of bolt lever arm to bolt diameter (l/d) ratio on the AFC sliding performance. Results show hysteresis loop shape remained similar for all l/d. However, increasing l/d from 1.38 to 3.88 reduced the average AFC strength by 42–47%, reduced the hysteresis loop loading stiffness by 33–47%; and reduced the effective friction coefficient from 0.28 to 0.08. For AFCs with l/d ≥3.25, bolts underwent significant flexural yielding, which reduced their performance in future cycles.

摘要

虽然非对称摩擦连接 (AFC) 已被用作钢结构中的抗震能量耗散装置，但仍需要基于对其行为的深入了解来制定设计指南。本文描述了使用 Bisalloy 500 垫片和 2 个 M16 Grade 8.8 螺栓对 18 个 AFC 进行的准静态测试，以量化螺栓杆臂与螺栓直径 ( l/d ) 比对 AFC 滑动性能的影响。结果显示所有l/d的磁滞回线形状保持相似。然而，将l/d从 1.38 增加到 3.88 会使平均 AFC 强度降低 42-47%，将磁滞回线加载刚度降低 33-47%；并将有效摩擦系数从 0.28 降低到 0.08。对于具有l/d的 AFC ≥3.25，螺栓经历了显着的弯曲屈服，这降低了它们在未来循环中的性能。