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A study on the ultimate performance of steel high-rise buildings subjected to long period seismic ground motions which are estimated during severe earthquakes

强震期间长周期地震动作用下钢结构高层建筑的极限性能研究

基本信息

批准号：
18560557
负责人：
YAMAZAKI Shinji
金额：
$ 2.44万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

It is conjectured that in the Tokyo Metropolitan, Osaka and Nagoya areas seismic ground motions with large power over a long period component caused by destructive deep-sea earthquakes such as Tokai, Tonankai or Nankai earthquakes, which are expected to occur in the near future, will continue over several minutes. This study aims at making clear the critical performance of steel high-rise buildings in cases where they are subjected to long period seismic ground motions which are estimated during severe earthquakes.The seismic performance of steel structural frames is limited by the collapse of beams in most cases. In this study, in order to make clear the behavior of beams and their critical performance cyclic loading tests were carried out using beam specimens with about the same width-thickness ratio as well as with the same end connection details as those which are used in existing high-rise frames. In all, 30 specimens were used in the tests covering 8 different types. For the purp … More ose of making clear the effects of the loading hysteresis on the energy absorption capacity, several types of loadings each with different amplitudes and cyclic patterns were carried out for the specimens which have the same shapes.The results obtained from this study can be summarized as follows :With regard to the critical performance of beams whose maximum strength is determined by the fracture of flanges at the beam end connection1)The fracture behavior can be divided into the following two types.Type (F1): The specimen fractures after cracks expand from the center of the width of the flange weld and the sectional area ratio decreases to 70 80%.Type (F2) : The specimen fractures after cracks expand from the edge of the width of the flange weld and the sectional area ratio decreases to 90 95%.2)The maximum strength ratio in the case of the cyclic loading decreases with an increase in the number of the plastic cyclic loading. However, the decreasing degree in the case of type (F2) is smaller than that for (F1).3)The maximum strength ratio in the case of the monotonic loading can be estimated using the existing method.4)The energy absorption capacity in the case of the monotonic loading can be estimated using the maximum strength ratio in the case of the monotonic loading.5)A method for estimating the lowest limit value of the energy absorption capacity in the case of the cyclic loading using both the energy absorption capacity for the monotonic loading and the effective number of the cyclic loading has been derived.With regard to the critical performance of beams in which the maximum strength is determined by the local buckling1)The energy absorption capacity in the case of the monotonic loading can be estimated using the method prescribed in the existing reference.2)A method for estimating the lowest limit value of the energy absorption capacity in the case of the cyclic loading using both the energy absorption capacity for the monotonic loading and the effective number of the cyclic loading has been derived. Less

在东京都、大坂和名古屋地区，由东海、东南海或南海地震等破坏性深海地震引起的长周期分量的大功率地震地面运动将持续几分钟。本文的研究目的是明确钢结构高层建筑在强震时受到长周期地震动作用时的临界性能，钢结构框架的抗震性能在大多数情况下受到梁的倒塌的限制。为了弄清梁的受力性能及其临界性能，本文采用了与现有高层框架相同的梁试件进行了循环荷载试验，这些梁试件的宽厚比和端部连接细节与现有高层框架中的梁试件相同。试验共使用了30个试件，涵盖8种不同类型。为了 ...更多信息为了弄清加载滞后对能量吸收能力的影响，对具有相同形状的试件进行了几种不同幅值和循环模式的加载试验，得到的结果可以概括如下：对于最大强度由梁端连接处翼缘断裂决定的梁的临界性能1）断裂行为可以分为以下两种类型：（F1）：裂纹从法兰焊缝宽度中心扩展后试样断裂，截面积比减小至70 - 80%。类型（F2）：试样断裂后裂纹从翼缘焊缝宽度边缘扩展，截面积比减小到90.95%。循环荷载作用下的最大强度比随塑性循环荷载次数的增加而减小。然而，在这方面，3）单调加载时的最大强度比可以用现有方法估算; 4）单调加载时的能量吸收能力可以用单调加载时的最大强度比估算; 5）单调加载时的能量吸收能力可以用单调加载时的最大强度比估算本文提出了用单调加载的能量吸收能力和循环加载的有效次数来估算循环加载时能量吸收能力的下限值的方法，并对最大强度为1）单调加载情况下的能量吸收能力可以用现有文献中的方法来估算; 2）推导了一种用单调加载的能量吸收能力和循环加载的有效次数来估算循环加载情况下能量吸收能力下限值的方法。少