摘要
现有钢板剪力墙耐震设计规范对于多楼层钢板剪力墙边界梁柱的容量设计并无清楚交代,本研究的目的在于研发方便且有效的多楼层钢板剪力墙的耐震分析与容量设计方法。探讨不同原理的钢板剪力墙底层边界柱容量设计法,研究如何避免底层柱顶塑性铰的产生,并以ABAQUS有限元模型证实所提设计方法可以有效地避免柱顶塑性铰的发生,而避免侧向变形集中在底层时的软弱层现象。本研究采用美国洛杉矶市反应谱分别设计了6层以及20层的钢板剪力墙建筑结构,并用结构非线性分析软件PISA3D建立双向板条模型进行非线性时程分析,依SAC计划中20组475年回归期的地震分析统计结果讨论钢板剪力墙结构在强烈地震下的反应。由构架动力分析反应和所估计的最大静态需求比较,可观察到钢板对边界柱的最大累积拉力的静态估计值会随着楼层位置越低时有越高估的趋向。此外,边界梁端的最大剪力在上下层钢板厚度相同处,静态估计值有严重低估的情形发生,因此会造成边界梁端的最大累积剪力静态估计值随着楼层位置越低时有越低估不保守的趋向。最后依时程分析结果给出不同楼层数的钢板剪力墙边界柱轴力需求的估算方式建议,依此建议可设计出安全且经济的边界柱。
The seismic design method for the boundary members of Steel Plate Shear Wall （SPSW） has not been fully implemented in the model building codes. The purpose of this research is to develop a convenient and reasonable capacity design procedure for the multi-storey SPSW buildings. This research proposes a new capacity design method for bottom column which can be applied to avoid the plastic hinge forming at the first story column top. The proposed method is verified using finite element shell model for six SPSW designs with three different aspect ratios. It is confirmed that the proposed method works well,could avoid the deformation concentration or the soft story mechanism at the 1^st story of a SPSW. Finally, following the US seismic design force requirements for SPSW buildings of different stories in Los Angeles,nonlinear response history analyses are conducted in this research using a suite of 20 scaled SAC ground motions on different designs using the strip models to investigate the statistical results under the 10/50 level earthquakes. Comparing the dynamic responses with the estimated static maximum demands computed from the static capacity design method, it can be found that maximum accumulated panel force contributed to the column axial force is significantly overestimated in lower stories. Moreover, the dynamic maximum boundary beam end shear can be much greater than the estimated static demand when the panel thicknesses above and below the beam are identical, that cause the maximum accumulated boundary beam end shear may be underestimated in the lower stories. Base on the analytical results, this research proposes the method of estimating axial force demand of boundary members for different storey buildings. The safe and economic design of first story column can be conducted by proposed method.
出处
《建筑钢结构进展》
北大核心
2012年第2期14-27,共14页
Progress in Steel Building Structures
基金
台湾科学委员会专题研究计划(NSC-98-2625-M-002-015)
