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Seismic Response Observation of Super High-Rise Buildings Throughout their Construction Stage and Development of Long-Stroke Shaking Table for Tracing Long-Period Floor Response

超高层建筑施工全阶段地震响应观测及追踪长周期楼层响应的长冲程振动台开发

基本信息

批准号：
17360269
负责人：
FUKUWA Nobuo
金额：
$ 9.73万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

In this research project, the fundamental dynamic properties of super high-rise buildings are investigated based on a large quantity of data observed during their construction stage. To understand the differences in structural response between structurally similar buildings with different numbers of floors, observations can be carried out in a single building during its construction, as earthquakes are likely to occur throughout the construction period when different numbers of floors have been completed. In this research, three super high-rise buildings have been observed. We clarify that the natural period is approximately proportional to the building height, while the damping ratio is inversely proportional. In the case of long-period buildings with small damping, when the natural period is close to the predominant period of soil, the seismic response of the building is enormously amplified for long-duration seismic ground motion. This phenomenon is explained from both observations … More and a simple analysis of a system with one degree of freedom. The changes in natural periods and damping ratios were obtained from microtremor records for a 47-story building while under construction. The natural period increases almost linearly with building height, both for the first and second modes, while the damping ratio is scattered around 0.5%. This damping value corresponds to the material damping of the steel itself.To promote countermeasures for super-high-rise buildings against long-period ground motions arising from predicted massive earthquakes, it is necessary to inform structural designers and building owners that buildings might suffer from an unexpectedly large response due to resonance. To ensure that structural designers and building owners are aware of this risk, it is necessary for them to experience the amount of floor response. They will then understand the necessity of safety measures for indoor areas and the importance of the addition of dampers to reduce the response.Conventional shaking tables are unable to reproduce this movement because of the displacement limit of the dynamic actuator used to drive the table. We developed a new shaking table named the 'Triple-L shaker,' which stands for he 'Long-stroke Long-period Linear shaker,' to reproduce the response of super-high-rise buildings. The innovation in this idea is the use of two servo-motors that pull the rope connected to the shaking table on the rail from both sides, as shown in Figure 13 and Photo 2. Compared with ordinary shaking tables, this system doesn't require a large space or special power supplies. The table reproduces amplitudes of displacement of up to 3 m, velocities of 5m/s, and acceleration of 2G. Using this table, people can easily experience the arbitrary response of various buildings upon different soil conditions. Less

本研究以超高层建筑施工阶段的大量实测数据为基础，对超高层建筑的基本动力特性进行了研究。为了了解不同层数的结构相似建筑物之间的结构反应差异，可以在建筑施工期间对单个建筑物进行观测，因为在整个施工期间，当不同层数的楼层已经完成时，地震很可能发生。在这项研究中，三个超高层建筑进行了观察。我们澄清了自振周期近似与建筑物高度成正比，而阻尼比成反比。对于阻尼较小的长周期建筑物，当自振周期与土的卓越周期接近时，长时程地震动对建筑物的地震反应有很大的放大作用。这一现象可以从两个观测结果中得到解释 ...更多信息并对一个单自由度系统进行了简单分析。根据一栋47层建筑的地脉动记录，得到了该建筑的自振周期和阻尼比的变化。第一阶和第二阶振型的自振周期随建筑物高度几乎呈线性增加，而阻尼比分散在0.5%左右。该阻尼值与钢材本身的材料阻尼相对应。为了促进超高层建筑物应对预测大地震引起的长周期地面运动的对策，有必要告知结构设计师和建筑物业主，建筑物可能会因共振而遭受意外的大响应。为了确保结构设计师和建筑物业主意识到这种风险，他们有必要体验楼板反应的量。然后，他们将了解室内区域安全措施的必要性以及增加阻尼器以减少响应的重要性。由于用于驱动振动台的动态致动器的位移限制，传统的振动台不能再现这种运动。我们开发了一种新的振动台，名为“三L振动台”，代表他“长冲程长周期线性振动台”，以再现超高层建筑的反应。这个想法的创新之处在于使用了两个伺服电机，从两侧拉动连接到轨道上的振动台的绳索，如图13和照片2所示。与普通振动台相比，该系统不需要大的空间和专用电源。该表再现了高达3 m的位移幅度、5 m/s的速度和2G的加速度。利用该表，人们可以很容易地体验到各种建筑物在不同土壤条件下的任意反应。少