Seismic Retrofit of Reinforced Concrete Shear Walls to Ensure Reparability
Seismic Retrofit of Reinforced Concrete Shear Walls to Ensure Reparability
复制标题
钢筋混凝土剪力墙的抗震改造确保可修复性
DOI：
10.1061/9780784482896.046
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Aaleti, Sriram
中科院分区：
文献类型：
--
作者：
Basereh, Sina;Okumus, Pinar;Aaleti, Sriram
许多在高震区采用现代抗震规范之前建造的钢筋混凝土（RC）建筑需要进行改造，以在大地震中表现良好。本研究为缺乏规范的钢筋混凝土剪力墙引入了一种新的改造方法，这种剪力墙由于细节不当或缺乏良好的边界元素而容易受到非延性破坏模式的影响。改造方法结合了剪力墙的削弱与基础切割和墙壁的自定心，并增加了外部无粘结后张力股。与经受剪切和弯曲的原始墙壁相比，改造后的墙壁有望具有可控的摇晃行为，并有望将地震造成的损害降至最低，从而缩短维修时间，降低维修成本。采用循环侧向荷载作用下剪力墙加固前后的三维有限元模型，确定加固方法的工作细节。为了传递剪力在基础和减少剪切滑移，剪切键和其他非直墙基础切割形状进行了探索。剪切，弯曲和摇摆的贡献，以全球响应进行了测量和比较前和后改造的墙壁。分析结果表明，对墙体进行改造后，墙体晃动是墙体的控制行为，剪力对墙体位移的贡献减小。在剩余位移，能量耗散，强度和割线刚度的变化，由于改造被记录。
Many reinforced concrete (RC) buildings built before the adoption of modern seismic codes in high seismic regions need to be retrofitted to perform well in a major earthquake. This study introduces a new retrofit method for code-deficient reinforced concrete shear walls that are vulnerable to non-ductile failure modes due to improper detailing or lack of well-confined boundary elements. The retrofit method combines weakening of shear walls with a base cut and self-centering of the walls with the addition of external unbonded post-tensioned strands. The retrofitted walls are expected to have controlled rocking behavior as opposed to the original walls that undergo shear and flexure and are expected to have minimized damage caused by earthquakes resulting in shorter repair times and lower repair costs. Three-dimensional finite element models of pre- and post-retrofit shear walls under cyclic lateral loading were used to identify working details of the retrofit method. To transfer shear at base and minimize shear slip, shear keys and other non-straight wall base cut shapes were explored. The contribution of shear, flexure, and rocking to the global response were measured and compared for pre- and post-retrofit walls. Results of analysis showed that rocking is the governing behavior for the retrofitted walls and contribution of shear to displacements decreased due to retrofit. Changes in residual displacements, energy dissipation, strength, and secant stiffness due to retrofit were documented.
使用弱化和自定心改造的钢筋混凝土剪力墙：数值模拟
影响因子：
4.1
作者：
Basereh, Sina;Okumus, Pinar;Aaleti, Sriram
通讯作者：
Aaleti, Sriram
影响因子：
3.1
作者：
M. Bruneau;Hadi Kenarangi;T. P. Murphy
通讯作者：
T. P. Murphy