Seismic damage control of nonlinear continuous reinforced concrete bridges under extreme earthquakes using MR dampers
Seismic damage control of nonlinear continuous reinforced concrete bridges under extreme earthquakes using MR dampers
复制标题
利用磁流变阻尼器控制非线性连续钢筋混凝土桥梁在极端地震下的震害
DOI：
10.1016/j.soildyn.2016.07.015
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发表时间：
2016-09
影响因子：
4
通讯作者：
石运东
中科院分区：
文献类型：
--
作者：
李忠献;陈宇;石运东
在极端地震作用下，连续梁桥容易因支座或桥墩的破坏而破坏。桥墩与主梁之间的强连接减小了支座的位移，但增加了主梁对桥墩底部的惯性力，导致桥墩损坏。相反，在保护桥墩的同时，薄弱的连接会导致轴承损坏。在许多情况下，桥梁失去了它的功能，由于损坏集中在局部成员，而其余的成员仍然完好无损。为了在地震作用下同时保护支座和桥墩，使损伤分布均匀，提出了一种基于桥梁构件损伤的磁流变阻尼器实时半主动控制算法。建立了两个位移指标来表征支座和桥墩的损伤状态，并将其作为MR阻尼器力的控制信号。一个典型的三跨钢筋混凝土连续梁桥的非线性纤维损伤单元模拟用于演示所提出的方法。被动控制采用粘滞阻尼器（PVD）和磁流变阻尼器与恒定电流（PMR）也被采用的比较。数值模拟结果表明，该方法比被动控制更能有效地保护支座和桥墩。通过RTSD控制，支座和桥墩的损伤得到平衡，各桥墩的有限损伤在允许范围内均匀发展。此外，初始阻尼力可以设置在一个广泛的范围内，RTSD控制，以保护双方的轴承和桥墩在各种地震。相反，通过被动控制不可能选择适当的阻尼力。RTSD控制还可以在极端地震下将桥墩损伤控制在不同的规定目标内。
Under extreme earthquakes, a continuous bridge tends to fail because of the damage to the bearing or the pier. A strong connection between the girder and the pier decreases the bearing displacement, but the increased inertia force of the girder to the base of the pier leads to pier damage. Conversely, a weak connection while protecting the pier causes bearing damage. In many cases, the bridge loses its function due to the damages concentrated on local members, while the rest of the members remain undamaged. To simultaneously protect both the bearing and pier during earthquakes with an evenly distributed damage pattern, a new real-time semi-active control algorithm based on the damage of bridge members (RTSD) using magneto-rheological (MR) dampers is proposed. Two displacement indices are established to represent the damage status of the bearing and pier and are used as control signals for the MR damper forces. A typical three-span continuous reinforced concrete bridge modeled by nonlinear fiber damage elements is used for the demonstration of the proposed method. Passive controls using viscous dampers (PVD) and MR dampers with a constant current (PMR) are also adopted for comparisons. Numerical simulation results show that the proposed method is more effective in protecting the bearing and pier than the passive controls. With the RTSD control, the damages to the bearing and pier are balanced and the limited damages to each pier can be evenly developed within the allowable range. Moreover, the initial damper force can be set in a wide range for the RTSD control to protect both the bearing and pier under various earthquakes. In contrast, it is impossible to select a proper damper force by passive controls. The RTSD control can also control the pier damage within different prescribed targets under extreme earthquakes.
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DOI：
10.1061/(asce)0733-9445(1992)118:1(284
发表时间：
1993-08
期刊：
Journal of Structural Engineering-asce
影响因子：
--
作者：
R. Mayes;I. Buckle;T. Kelly;L. Jones
通讯作者：
R. Mayes;I. Buckle;T. Kelly;L. Jones
DOI：
--
发表时间：
2007
期刊：
--
影响因子：
--
作者：
M. Sheikh;F. Légeron;C. Guiziou;A. Vivier
通讯作者：
M. Sheikh;F. Légeron;C. Guiziou;A. Vivier
影响因子：
4.5
作者：
A. Guo;Zhongjun Li;Hui Li;J. Ou
通讯作者：
A. Guo;Zhongjun Li;Hui Li;J. Ou
DOI：
10.5459/bnzsee.33.3.265-285
发表时间：
2000-09
期刊：
Bulletin of the New Zealand National Society for Earthquake Engineering
影响因子：
--
作者：
K. Kawashima
通讯作者：
K. Kawashima
影响因子：
3.6
作者：
S. El-Bahey;M. Bruneau
通讯作者：
S. El-Bahey;M. Bruneau