资源类型

期刊论文 2

年份

2021 1

2018 1

关键词

皮卫星；星箭分离机构；分离参数；参数优化 1

检索范围：

排序： 展示方式：

Effect of eccentricity in reinforced concrete beam-column-slab connection under cyclic loading

Rooh ULLAH, Amjad NASEER, Muhammad FAHIM, Mohammad ASHRAF, Eid BADSHAH

《结构与土木工程前沿（英文）》 2021年 第15卷 第2期   页码 390-398 doi: 10.1007/s11709-021-0690-3

摘要： Beam–column connections are one of the most critical elements of reinforced concrete structures, especially in seismically active regions, and have been extensively evaluated experimentally and numerically. However, very limited experimental studies about eccentric reinforced concrete connections including the effect of connected slabs are available. This study presents the experimental results of two half-scale eccentric beam-column-slab connections subjected to quasi-static cyclic loading. The horizontal eccentricity ( ) is maintained at 12.5% and 25% of column width ( ) for specimens 1 and 2, respectively. The damage pattern, performance levels, displacement ductility ( ), energy dissipation, and connection strength and stiffness are compared for both specimens, and the effect of eccentricity is evaluated. It is concluded that the eccentricity has no significant effect on the lateral load carrying capacity; however, the overall strength degradation increases with the increase in eccentricity. Similarly, the elastic stiffness of specimen 2 decreased by 14% as the eccentricity increased from 12.5% to 25%; however, the eccentricity had no significant effect on the overall stiffness degradation. decreased by 43%, and the energy dissipation capacity decreased by 40% in specimen 2 with higher eccentricity. The story drifts corresponding to the performance levels of the life safety (LS) and collapse prevention (CP) were found to be 28% lesser in specimen 2 than in specimen 1.

关键词： corner connection     eccentricity     strength degradation     stiffness degradation     energy dissipation     performance levels    

HTML PDF 收藏

一种大偏心皮卫星分离参数复合优化方法 None

Lai TENG, Zhong-he JIN

《信息与电子工程前沿（英文）》 2018年 第19卷 第5期   页码 685-698 doi: 10.1631/FITEE.1700416

摘要： 航天飞行器的分离参数直接影响它的飞行轨迹，如果分离参数超过它能承受的极限，则飞行器难以调整飞行姿态，可能造成飞行器偏离轨道或坠毁。提出一种将角速度与外矩结合的大偏心皮卫星分离参数复合优化方法。通过改变弹性发射装置位置，在分离机构变化较小情况下，有效控制飞行器弹出过程。给出了角速度偏差的原因和不可信的优化结果，并对不可信的优化结果进行分析。通过地面无重力试验对该优化方法进行验证。仿真和试验结果表明，该优化方法能有效优化大偏心皮卫星的分离参数。该方法特别适用于固定和非稳定状态弹性参数、各种弹性装置的分布以及难以校正姿态的大偏心航天飞行器，在实际应用中具有通用性和易操作性。

关键词： 皮卫星；星箭分离机构；分离参数；参数优化    

HTML PDF 收藏

标题 作者 时间 类型 操作

Effect of eccentricity in reinforced concrete beam-column-slab connection under cyclic loading

Rooh ULLAH, Amjad NASEER, Muhammad FAHIM, Mohammad ASHRAF, Eid BADSHAH

期刊论文

一种大偏心皮卫星分离参数复合优化方法

Lai TENG, Zhong-he JIN

期刊论文