往复荷载作用下配置摩擦型阻尼器钢木混合剪力墙抗侧力性能研究

随着我国土木工程行业由建造向运维逐渐转型，工程结构服役安全保障需求陡增，提质增效的结构智能诊断方法成为研究热点。结构服役性态指标是表征工程结构安全水平的要素，是工程结构诊断养护技术体系以及结构健康监测研究的基础，判断结构服役性态的敏感指标并进一步实现指标的智能识别是工程结构诊断智能化的首要任务。为此，围绕工程结构运维公共建筑、地铁隧道、公路桥梁、公路路面等多个场景中的敏感服役指标的智能识别开展综述研究；梳理关键敏感指标，进一步对指标的智能化识别方法进行归纳总结。结果表明，以深度学习为代表的新一代人工智能技术有效推动了结构服役敏感指标的感知识别研究与应用，其中数字图像方法与深度学习算法在工程结构变形、表面病害智能识别中取得了良好的效果，展现了全面的应用优势。

Lateral performance of timber-steel hybrid shear wall with friction dampers under cyclic loading

This paper presents the experimental and analytical analyses on the lateral performance of timber-steel hybrid shear wall with friction dampers. The mechanical properties of friction dampers were investigated with a series of static and dynamic tests. The friction damper consists of inner and outer steel plates, friction material, and high-strength bolt. The friction material, namely, Non Asbestos Organic materials (NAO-780) or Polytetrafluoroethylene (PTFE), is sandwiched between the inner and outer steel plates and is clamped by the high strength bolt, and a slotted hole is arranged in the inner steel plate. The damper is activated to dissipate energy when the steel plates begin to slide. The dampers can be locked at the onset of the contact between the high strength bolt and the end of the slotted hole. Damper test results show that the activation force of the damper is in proportion to the amount of torque applied on the high-strength bolt. The friction performance of NAO-780 is stable under different loading amplitudes and frequencies. So the damper is further incorporated into the timber-steel hybrid shear wall. The lateral resisting mechanism of the hybrid shear wall system was then investigated through cyclic loading tests. Test results show that when damper activation force is large, the damper will not activate under small lateral load and will act as a shear connection between the steel frame and the wood shear wall, so a higher lateral stiffness can be available. When the length of the slotted hole is long, there will be a larger relative lateral deformation between the steel frame and the wood shear wall, so the wood shear wall is in protection until the lock of the damper, then the wood shear wall can deform laterally and protect the structure against collapse under extremely large earthquakes. A reasonable set of the two factors (i.e., damper activation force and length of the slotted hole) can reduce the damage of the hybrid system under earthquakes,so the system has sufficient lateral resistance even under the large lateral deformation. The earthquake resilience of the system can be improved.