Evaluation of Ultimete Limit State Strength of Steel Structures

钢结构极限状态强度评价

• 批准号: 63460170
• 负责人: TAKANASHI Koichi
• 金额: $ 4.22万
• 依托单位: Institute of Industrial Science, University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460170/
• 关键词: failure mode; external excitation; inertial force; static loading test; dynamic loading test; ultimate state aseismatic design; 限界状態設計; 結局限界状態; 地震応答; 風応答; オンライン応答実験; failure mode; external excitation; inertial force; static loading test; dynamic loading test; ultimate state aseismatic design; 限界状態設計; 結局限界状態; 地震応答; 風応答; オンライン応答実験

The purpose of this study is to find the failure mechanism of frame in ultimate state which dissipates a input energy to the frame by earthquake excitations or wind loading.There were three types of tests conducted static tests, earthquake response tests and dynamic response tests by wind loading.All these tests were conducted on 3-story frames and were controlled by the On-line test technique.The test results are summarized below:(1) The strength observed at the static tests is much higher than the strength which is calculated by a simple plastic analysis for perfectly elastoplastic materials. In order to evaluate correctly the strength of frame, it is very important to take into account the strain-hardening effect at the strength analysis of frame.(2) The trajectories of the inertial forces are crowed along the line representing the ratio between the inertial forces during the 1st mode vibration. It suggests the possibility of representing the dynamic load effects by an equivalent static load.It is possible to develop the simple ultimate state aseismatic design method characterized by equivalent static parameters, in the case of comparatively small effects of higher mode of vibration in frames.Considering the interactive effects between velosity of frame and wind verosity at the wall exposing to the wind, the dynamic loading distribution exerting at the each floor of frame is nearly equal to the static wind loading distribution. The 1st mode vibration in dynamic response, however, are dominant. Then, there are no interactive relation between the ratios of the work done by the static shear force at the each floor and by the dynamic loads.

这项研究的目的是在最终状态下找到框架的失败机制，该机制通过地震激发或风载来耗散输入能量到框架。进行了三种测试的三种类型的静态测试，地震响应测试，地震响应测试和动态响应测试，通过风载进行了动态测试。所有这些测试均在三层测试中进行了测试，并通过沿线测试进行了统治（1均已通过沿线的测试进行了统治。静态测试远高于通过对完美弹性塑料材料进行简单的塑料分析计算得出的强度。为了正确评估框架的强度，要考虑到框架强度分析处的应变硬化效果非常重要。（2）惯性力的轨迹沿着线挤压，代表了在第一模式振动中惯性力之间的比例。它表明，可以通过等效的静态载荷来表示动态负载效应。在相对较小的振动模式相对较小的情况下，可以开发出以等效静态参数为特征的简单最终的状态无性无障碍设计方法。静态风载分布。但是，动态响应中的第一个模式振动是主要的。然后，在每个楼层的静态剪切力和动态载荷所做的工作比率之间没有互动关系。