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

基本信息

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

项目摘要

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

本研究项目研究了由高强度螺栓和角钢或端板组成的半刚性部分强度梁柱连接，并对引入此类连接或半刚性连接的各种试验结构进行了 Cydic 加载试验和拟动力试验。 -此外，还开发并建造了一个被称为“钢秋千”的摆式天文台，其中一个 15000 公斤的质量悬挂在一个刚性钢框架和一个建筑样本上。观测站还安装了摆锤和框架之间的受迫振动试验系统和地震监测数据采集系统。这种半刚性框架一般存在中震时变形过大的缺点，需要适当加劲。可能需要在监测现场建造的现有柔性抗力矩框架上进行伪动力测试，该框架使用低屈服点钢剪力板阻尼器来加固模式结构。在该地点记录的过去事件中的地面运动被用作拟动力测试的输入激励（这些事件是在1985年10月4日、1986年6月24日、1987年12月17日和9月11日观测到的。 1996.）根据试验结果检验了阻尼器的响应缓解效果。对于半刚性柱底座，矩形空心型钢柱由一个支撑。暴露的柱基由锚定螺栓和底板组成，安装在摆式观测台中，用于观察中等地震事件期间的刚度和阻尼，经过初步振动测试以及柱基对 18 次地震的响应后，于 2001 年开始进行地震监测。基于这些试验和监测数据，研究了在设计过程中如何对各种半刚性连接进行适当的分类，以及评估屈服强度、最大强度、刚度和变形能力的简单方法提出了具有半刚性部分强度连接的钢结构的适当设计程序，包括与阻尼器等其他抗震元件的组合。