Plastic Deformation of Beams in Steel Moment Frames Subjected to Strong Earthquakes

强震钢框架梁的塑性变形

• 批准号: 15560495
• 负责人: OGAWA Koji
• 金额: $ 2.37万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560495/
• 关键词: steel moment frame; ductility demand; steel wide flange beam; maximum story drift; maximum plastic rotation; cyclic hardening; seismic response; seismic design; 性能設計; 柱脚; 塑性変形; 鋼構造; ラーメン; 接合部係数

This project is concerned with the demand for ductility of beams in steel moment frames. The results from this project are summarized as follows :1.Numerical response analysis is carried out for 15 frames against a variety of ground motions. In this study, maximum plastic rotation, maximum increment of plastic rotation during a half-cycle of vibration, and the range of variable plastic rotation are considered as the parameters that represent the magnitude of plastic deformation. The results are summarized as formulas to predict those parameters based on maximum story drift angles.2.Based on the above-mentioned numerical results, we deal with hysteretic behavior. Cumulative plastic rotation, the increment of plastic rotation during each half-cycle of vibration, and the hysteretic process of plastic rotation are discussed. A method is proposed to approximate damage to the beams in steel moment frames subjected to strong ground motions.3.A computer program is developed based on the one-dimensional finite element method in which a generalized constitutive relationship considering isotropic hardening and kinematic hardening is incorporated. Numerical analysis of steel wide-flange beams is carried out under various loading sequences similar to seismic response. The results are summarized as a method to predict the maximum bending moments of beams, taking into account the maximum story drift angles.

本课题研究的是钢框架中梁的延性要求。主要研究成果如下：1.对15个框架结构进行了多种地震作用下的数值反应分析。在这项研究中，最大塑性旋转，在振动的半个周期内的最大增量的塑性旋转，和可变的塑性旋转的范围被认为是代表的塑性变形的大小的参数。基于最大层间位移角，给出了相应的计算公式。2.在上述数值计算结果的基础上，对结构的滞回性能进行了分析。讨论了累积塑性转角、每半周的塑性转角增量以及塑性转角的滞回过程。提出了一种强地震动作用下钢框架梁损伤的近似计算方法。3.基于一维有限元法，编制了考虑各向同性硬化和随动硬化的广义本构关系的计算程序。对宽翼缘钢梁在各种类似地震作用的加载顺序下进行了数值分析。结果总结为一种方法来预测梁的最大弯矩，考虑到最大层间位移角。

项目成果

Plastic Deformation of Column Base in Steel Moment Frames Subjected to Strong Earthquakes

强震钢框架柱底塑性变形

• 发表时间: 2005
• 期刊: Journal of Constructional Steel Vol.12,No.45
• 作者: H.Nakahara;k.Ogawa
• 通讯作者: k.Ogawa

強震を受ける鋼構造ラーメン骨組の梁に生じる最大曲げモーメント

刚架钢框架梁在强震作用下出现的最大弯矩

• 发表时间: 2004
• 期刊: 日本建築学会構造系論文集 580号
• 作者: H.Nakahara;k.Ogawa;小川厚治;小川厚治
• 通讯作者: 小川厚治

Maximum Bending Moments of Beams in Steel Frames Subjected to Strong Grand Motions

强大运动下钢框架梁的最大弯矩

• 发表时间: 2004
• 期刊: J.Struct.Constr.Eng., AIJ No.580
• 作者: K.Ogawa;R.Nagamoto
• 通讯作者: R.Nagamoto

Plastic Deformation of Beams in Steel Moment Frames Subjected to Strong Earthquakes(part 1 : Maximum Deformation)

强震钢框架梁的塑性变形（第1部分：最大变形）

• 发表时间: 2003
• 期刊: Journal of Constructional Steel Vol.10,No.39
• 作者: K.Ogawa;H.Nakahara
• 通讯作者: H.Nakahara

強震を受ける鋼構造ラーメン骨組の柱脚に生じる塑性変形

强震作用下刚架钢框架柱底塑性变形

• 发表时间: 2005
• 期刊: 日本鋼構造協会鋼構造論文集 Vol.12, No.45(掲載予定)
• 作者: 中原寛章