“Base shear capping buildings with graphite-lubricated bases for
“Base shear capping buildings with graphite-lubricated bases for
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“带有石墨润滑底座的底座剪力盖建筑
DOI：
10.1002/eqe.2842
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发表时间：
2017
影响因子：
4.5
通讯作者：
M.
中科院分区：
文献类型：
--
作者：
Barbagallo;F.;Hamashima;I.;Hu;H.;Kurata;M.;and Nakashima;M.
易受地震力影响的建筑物的损坏或倒塌可能会造成人员伤亡，对此类结构进行抗震加固是解决这一缺陷的实际办法。这里提出的研究提出了一种简单的方法，以防止结构倒塌，分离的上部结构从其基础，让上部结构滑动在极端的地面震动。滑动机构有助于限制施加在上部结构上的水平力。在这种方法中，关键是保持上部结构和基础之间的摩擦力足够低和稳定。本研究提出借由结构柱底部之碳粉润滑，来实现一种可控制滑动的机制，其可作为结构的保险丝。通过振动台试验和数值模拟，研究了该结构体系的基本性能。实验和数值计算结果表明，石墨润滑是一种有效的和强大的润滑材料，保持钢柱脚和砂浆基础之间的摩擦系数在0.16左右。底部的滑动显著降低了传递到上部结构的加速度，保持底部剪切系数不大于约0.40。版权所有© 2016约翰威利父子有限公司.
Damage or collapse of buildings vulnerable to seismic forces may cause human casualties, and seismic upgrading of such structures is a practical solution to this deficiency. The study presented here proposes a simple approach to prevent structural collapse by separating the superstructure from its foundation to let the superstructure slide during extreme ground shaking. The sliding mechanism contributes to cap the horizontal force exerted on the superstructure. In such approach, the key is to maintain the friction force between the superstructure and the foundation sufficiently low and stable. This research proposes to realize a controlled sliding mechanism, which acts as a structural fuse, by means of carbon powder lubrication at the bases of the structure's columns. The fundamental behaviour of the proposed structural system, named the base shear capping building, is investigated by shaking table tests and numerical simulation. Both experimental and numerical results showed that graphite lubrication is an efficient and robust lubrication material, maintaining the friction coefficient between the steel column bases and mortar foundation at around 0.16. The sliding at the bases significantly reduced the acceleration transmitted to the superstructure, keeping the base shear coefficient not greater than about 0.40. Copyright © 2016 John Wiley & Sons, Ltd.