Observation Earthquake Response and Pseudo-dynamic Tests on Semi-rigid Partial-strength connectipns with Steel Structure

钢结构半刚性部分强度连接地震反应观测及拟动力试验

• 批准号: 12450220
• 负责人: OHI Kenichi
• 金额: $ 9.09万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450220/
• 关键词: Semi-rigid Connection; Partial-strength Connection; Seismic monitoring; Pseudo-dynamic Test; Exposed-type column base; Earthquake Resisting Element; 鋼構造; 接合部; 地震観測; オンライン地震応答実験

Semi-rigid partial-strength beam-to-column connections composed from high-strength bolts and angles or endplates were studied in this research project Cydic loading tests and pseudo-dynamic tests were performed on various test structures inducting such a type of connections or semi-rigid column bases. Furthermore, a pendulum-type observatory termed 'steel swing' was developed and constructed, where a 15000kg mass was hung from a rigid steel frame and a specimen of building element can be inserted between the pendulum and the frame. Forced vibration test system and data acquisition system for seismic monitoring are also installed in the observatory.Such semi-rigid frames have a disadvantage in general of too large deformation during moderate earthquakes, and appropriate stiffening may be needed. Pseudo-dynamic tests were performed on an existing flexible moment resisting frame that was built in the monitoring field. Low-yield-point steel shear panel dampers were used to stiffen the mode … More l structure. Several ground motions recorded in the past events at the site were used as input excitations in the pseudo-dynamic tests. (The events were observed on October 4, 1985, on June 24, 1986, on December 17, 1987, and on September 11, 1996.) The effects of response mitigation by the dampers were examined from the test results. As for semi-rigid column bases, a rectangular hollow section steel column was supported by an exposed column base that consists of anchor bolts and a base plate, and installed in the pendulum-type observatory to observe stiffness and damping during moderate seismic events. Seismic monitoring was started in 2001 after preliminary vibration tests, and responses of column base to eighteen events were successfully recorded.Based on these test and monitored data, how to classify various semi-rigid connections suitably in the design procedure was studied, and also a simple method for evaluating yield strength, maximum strength, rigidity, and deformation capacity were proposed. An appropriate design procedure of steel structures with semi-rigid partial-strength connections was proposed including a combination with other earthquake resisting elements such as dampers. Less

本课题研究了由高强螺栓和角钢或端板组成的半刚性部分强度梁柱节点，并对引入这种节点或半刚性柱脚的各种试验结构进行了Cydic加载试验和拟动力试验。此外，还开发和建造了一个钟摆式观测台，将15000公斤的质量悬挂在刚性钢框架上，并在钟摆和框架之间插入建筑构件试件。观测站还安装了强迫振动测试系统和地震监测数据采集系统。这种半刚性框架结构在中等地震时通常存在变形过大的缺点，可能需要适当的加强。对监测现场已有的柔性抗弯框架进行了拟动力试验。采用低屈服点钢板剪切板阻尼器对…模型进行加固。更多的是L结构。在拟动力试验中，使用了该场地以往事件中记录的几个地面运动作为输入激励。(这些事件分别发生在1985年10月4日、1986年6月24日、1987年12月17日和1996年9月11日。)试验结果验证了阻尼器的减振效果。对于半刚性柱基，由锚杆和底板组成的裸露柱基支撑矩形空心钢柱基，并安装在摆式观测台上，观察中等地震事件时的刚度和阻尼。经过初步的振动试验，于2001年开始进行地震监测，成功地记录了柱基对18个事件的反应。基于这些试验和监测数据，研究了如何在设计过程中对各种半刚性节点进行适当的分类，并提出了一种简单的计算屈服强度、最大强度、刚度和变形能力的方法。提出了考虑阻尼器等其他抗震构件组合的半刚性部分强度连接钢结构的合理设计方法。较少