Shaking Table Study on Displacement-Based Design for Seismic Retrofit of Existing Buildings Using Nonlinear Viscous Dampers

At present, the seismic design research of underground structures in loess areas is lagging behind compared with practical engineering requirements. The selection of seismic calculation methods and parameters does not consider the influences of the special geological conditions in various regions, so their usefulness is limited. Based on the above problems, a modified displacement-based method (DBM) was proposed and its application was compared with the most commonly used methods of analysis (force-based design method, displacement-based design method, detailed equivalent static analysis numerical method, and the full dynamic time-history method). The results were also validated by considering data from shaking table tests conducted on a case study involving the underground Feitian Road subway station in Xi’an. The results show that compared with DBM, the average accuracy of the modified DBM technique is improved by 41.65%. The modified DBM offers good accuracy, simplicity in its model, a rapid analysis time, and easy convergence.

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Displacement-Based Seismic Assessment of Low-Height Confined Masonry Buildings

Earthquake Spectra ◽

10.1193/1.3111149 ◽

2009 ◽

Vol 25 (2) ◽

pp. 439-464 ◽

Cited By ~ 11

Author(s):

Amador Terán-Gilmore ◽

Oscar Zuñiga-Cuevas ◽

Jorge Ruiz-García

Keyword(s):

Pushover Analysis ◽

Relative Strength ◽

Seismic Assessment ◽

Shaking Table ◽

Evaluation Procedure ◽

Masonry Buildings ◽

Confined Masonry ◽

Shaking Table Testing ◽

Displacement Based ◽

Global And Local

This paper presents a practical displacement-based evaluation procedure for the seismic assessment of low-height regular confined masonry buildings. First, the so-called Coefficient Method established in several FEMA documents is adapted to obtain rapid estimates of inelastic roof displacement demands for regular confined masonry buildings. For that purpose, a statistical study of constant relative strength inelastic displacement ratios of single-degree-of-freedom systems representing confined masonry buildings is carried out. Second, a nonlinear simplified model is introduced to perform pushover analysis of regular confined masonry buildings whose global and local behavior is dominated by shear deformations in the masonry walls. The model, which can be applied through the use of commercial software, can be used to establish the capacity curve of such buildings. Finally, the evaluation procedure is applied to a three-story building tested at a shaking table testing facility.

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Experimental study on seismic control of towers in cable-supported bridges by incorporating fluid viscous dampers between sub-towers

Advances in Structural Engineering ◽

10.1177/1369433220908031 ◽

2020 ◽

Vol 23 (10) ◽

pp. 2086-2096

Author(s):

Peng Zhou ◽

Min Liu ◽

Suchao Li ◽

Hui Li ◽

Gangbing Song

Keyword(s):

Control Strategies ◽

Experimental Tests ◽

Shaking Table ◽

Viscous Dampers ◽

Damping Force ◽

Alternative Scheme ◽

Seismic Control ◽

Fluid Viscous Dampers ◽

Seismic Loadings ◽

Energy Dissipation Devices

In this article, the seismic control of towers incorporated with fluid viscous dampers between sub-towers is investigated experimentally. To replace one entire tower, an alternative scheme consisting of four separate sub-towers is first proposed. Fluid viscous dampers are utilized as energy dissipation devices to be installed between sub-towers. Experimental tests are conducted to study the damping force characteristics. Three control strategies with various distributions of these dampers between sub-towers are developed. Then, a series of shaking table tests are carried out to evaluate the control performance of the proposed control strategies. Different earthquake records are adopted as seismic loadings. Experimental results clearly show a remarkable reduction in the towers seismic responses, including the accelerations, relative displacements, and strains. Rather than attaching dampers in concentrated ways, the strategy of distributing dampers uniformly behaves better.

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SEISMIC RETROFIT OF EXISTING BUILDINGS THROUGH THE DISSIPATIVE COLUMNS

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016) ◽

10.7712/100016.2425.7588 ◽

2016 ◽

Author(s):

Paolo Castaldo ◽

Bruno Palazzo ◽

Francesco Perri ◽

Ivana Marino ◽

Marco Maria Faraco

Keyword(s):

Seismic Retrofit ◽

Existing Buildings

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Direct Displacement-Based Seismic Retrofit of a 2D Concrete Frame Using Buckling Restrained Braces

2013 Fifth International Conference on Measuring Technology and Mechatronics Automation ◽

10.1109/icmtma.2013.120 ◽

2013 ◽

Author(s):

Wang Yu-Mei ◽

Wang Shuang

Keyword(s):

Seismic Retrofit ◽

Concrete Frame ◽

Buckling Restrained Braces ◽

Displacement Based

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Seismic Retrofit of Steel Deck-Truss Bridges: Experimental Investigation

Advances in Structural Engineering ◽

10.1260/136943302760228121 ◽

2002 ◽

Vol 5 (3) ◽

pp. 173-183

Author(s):

Gokhan Pekcan ◽

John B. Mander ◽

Stuart S. Chen

Keyword(s):

New York ◽

Seismic Retrofit ◽

Shaking Table ◽

Scale Model ◽

Load Path ◽

Truss Bridges ◽

Lateral Strength ◽

Stiffness Characteristics ◽

Strength And Stiffness ◽

Steel Deck

Alternative seismic retrofit strategies for steel deck-truss bridges are investigated in this study. Various modified tension-only bracing configurations, which consist of tendon elements with or without supplemental systems are introduced within the end-sway frames. The effectiveness of the retrofit configurations is demonstrated experimentally and analytically on a one-third scale model of an existing steel end-sway frame tested on the shaking table at the State University of New York at Buffalo. It is concluded that proposed alternatives can efficiently improve the lateral strength and stiffness characteristics. Moreover, the load path within the end-sway frame is modified to bypass the existing nonductile steel bearings. A stable energy dissipation mechanism is provided by means of re-centering elastomeric spring dampers along with fuse elements, thus reducing the overall seismic demand on the structural systems.

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