Civil Engineering |
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Seismic performance and parametric influences of damping-coupled wall system |
Shuai LIU1( ),Chao PAN2,*( ),Zhi-guang ZHOU3 |
1. School of Civil Engineering and Architecture, Zhejiang Sci-tech University, Hangzhou 310018, China 2. School of Civil Engineering, Yantai University, Yantai 264005, China 3. Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China |
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Abstract The wall piers were coupled by vertical metallic yielding dampers in the preset slits of coupling beams in the damping-coupled wall structure system, and the system’s basic structural forms and theory were as follows: cut off the coupling beams at their mid-spans and then connect the separated wall piers by vertically installed metallic yielding dampers. Therefore, the relative vertical dislocations between adjacent wall piers could motivate the dampers to dissipate seismic energy during earthquakes and thus the wall piers could be protected from severe damage. The nonlinear seismic responses of the damped wall were evaluated by modeling wall piers and coupling beams with macro beam elements, i.e., the fiber-section model with shear behavior, and dampers with link elements; the dimensionless parameters of dampers were chosen as key variables to execute seismic analysis and parametric studies. A series of static and dynamic nonlinear analysis cases were performed with regard to dimensionless parameters variation, and results indicates that the seismic responses of the damping-coupled wall can be well controlled with less cracks and damage compared with the conventional wall with a proper set of damping parameters. In brief, the proposed damping-coupled wall provides better seismic performance. Besides, the intensity, spectrum characteristics of seismic excitations and the distribution modes of dampers can both exert some influences on the seismic performance of a damping-coupled wall. Based on the analytical results, some recommendations are provided for the design of a damping-coupled wall.
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Received: 25 February 2018
Published: 04 March 2019
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Corresponding Authors:
Chao PAN
E-mail: sliu_2008@163.com;panchao@ytu.edu.cn
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耗能联肢墙体系的减震性能及参数影响
连梁内设置竖向变形阻尼器的耗能联肢墙体系的基本构造形式及原理如下:将联肢墙连梁在跨中位置处断开,用竖向放置的金属屈服型阻尼器连接两侧墙肢,在地震作用下两侧墙肢的竖向变形差使阻尼器发生变形,进而耗散地震能量,减少墙体的损伤. 基于宏观杆系有限元模型(考虑剪切的纤维截面)对耗能联肢墙体系进行非线性静、动力抗震分析,并以无量纲阻尼器参数为关键变量进行参数影响研究. 多个不同的阻尼器参数组合工况的分析及对比结果表明:当阻尼器参数设置合理时,耗能联肢墙的延性较常规联肢墙有所提高,地震响应明显降低,裂缝较少且分布均匀,具有良好的抗震性能和减震效果;地震动强度、地震动频谱特性及阻尼器参数的分布模式对体系的减震效果有一定影响. 根据分析结果给出设置连梁耗能联肢墙体系参数设计的相关建议.
关键词:
减震,
耗能联肢墙,
连梁,
金属屈服型阻尼器,
地震动特性
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