权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Hysteresis Damping Behavior of Steel Frames with Collapse of Beam Subjected to Earthquake Ground Motion

地震作用下梁倒塌钢框架的滞回阻尼行为

基本信息

批准号：
10650472
负责人：
MIKI Toshihiro
金额：
$ 1.02万
依托单位：
Daido Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650472/
关键词：
portal frame earthquake response collapse mechanism shear buckling web plate of beam partially tapered member 鋼製橋脚変断面ラーメン非弾性腹板履歴減衰

项目摘要

This research project studies the hysteresis damping behavior of steel frames with collapse of beam subjected to earthquake ground motion. Attention is paid to the collapse mechanism of portal frames with the collapse type of beam member1) The cumulative plastic strain of the column base parts, panel zones and column cross-section near panel zones decreases due to the shear collapse of web plates in beam. It should be noted that the strain rate of such shear panels in the plastic range is so high compared with that of column cross-sections.2) The numerical results demonstrate the fundamental plastic mechanism of frames with the shear collapse in the middle of beam and another collapse mechanism, which includes the shear yielding of panel zones in the beam-to-column connections. This mechanism is caused by the increase in shearing force due to strain hardening in the middle of beam.3) The partially tapered beam-columns subjected to cyclic bending can delays the occurrence of local buckling. The resulting damage is less than the uniform cross-section members and corresponding dissipated energy becomes larger with the increase in type ratio.4) The plastic bending deformation of the partially tapered sections set in beam near the beam-to-column connections can delay the increase in shearing force in beam. The resulting panel zones of connection remain almost elastic state.5) The decrease in the shear strength of web plates in beam eliminates the hysteresis damping effect corresponding to dissipated energy. It should be noted that the damage of column base parts and sway response of frames might become significant.

本课题研究地震地震动作用下梁倒塌钢框架的滞回阻尼特性。研究了梁构件倒塌类型的门式刚架的倒塌机理。1)由于梁腹板的剪力倒塌，柱基底、板区及板区附近柱截面的累积塑性应变减小。值得注意的是，与柱截面相比，这种剪力板在塑性范围内的应变率是如此之高。2)数值计算结果揭示了框架的基本塑性机制，即梁中剪力破坏机制和梁柱连接处板区剪力屈服破坏机制。这种机制是由于梁中部应变硬化导致剪力增大所致。3)循环弯曲作用下的部分锥形梁柱可以延缓局部屈曲的发生。随着型比的增大，损伤小于等截面构件，相应的耗散能增大。4)梁柱连接处设置的部分锥形截面的塑性弯曲变形可以延缓梁内剪力的增大。由此产生的面板连接区域几乎保持弹性状态。5)梁内腹板抗剪强度的降低消除了能量耗散所对应的滞回阻尼效应。应该注意的是，柱基础部分的破坏和框架的摇摆响应可能变得显著。