Shake Table Test of a Half-Scale 2-Storey Steel Building Seismically Retrofitted Using Rocking Braced Frame System

2018 ◽  
Vol 763 ◽  
pp. 466-474 ◽  
Author(s):  
Paul Mottier ◽  
Robert Tremblay ◽  
C.A. Rogers
Keyword(s):  
Test Specimen ◽  
Steel Structure ◽  
Shake Table Test ◽  
Shake Table ◽  
Test Program ◽  
Scaled Model ◽  
Braced Frame ◽  
Higher Mode Effects ◽  
Mode Effects ◽  
Frame System

The article introduces a shake table test program that was conducted to investigate the response of a two-storey rocking braced frame for which self-centring capacity is provided solely by the gravity loads supported by the frame. The test specimen is a 0.5 scaled model of a prototype rocking frame that was studied for the retrofit of a seismically deficient steel structure. The main objectives of the test program were to study the effects of column uplift and impact on shear forces and moments in the beams connected to the columns. Higher mode effects on brace forces were also of interest. Three different energy dissipation mechanisms located at the rocking interface were examined for drift control: friction, ring spring dampers, and vertical steel bars yielding in tension and buckling in compression. By changing the seismic weight of the test specimen, tests could be conducted for structures located in two different seismic regions of Canada to study the effect of the signature of the ground motions. Increases in beam forces due to column uplift and impact, as predicted by previous numerical simulations, were confirmed by the tests. High axial loads induced by the second vibration mode were also measured in the second storey braces.

Verification of Lateral Force Distributions for Base-Isolated Structures Including Higher Mode Effects

2003 ◽  
Author(s):  
C. S. Tsai ◽  
Bo-Jen Chen ◽  
Tsu-Cheng Chiang ◽  
Wen-Shen Pong
Keyword(s):  
Vertical Direction ◽  
Inertial Force ◽  
Steel Structure ◽  
Lateral Force ◽  
Shaking Table ◽  
Force Distribution ◽  
Higher Mode Effects ◽  
Mode Effects ◽  
Isolated Structures ◽  
Real Earthquake

The seismic design of new seismically isolated structures is mainly governed by the Uniform Building Code (UBC-97). In the UBC code, the distribution formula of the inertial (or lateral) forces leads to a triangular shape in the vertical direction. It has been found to be too conservative for most isolated structures through experimental, computational and real earthquake examinations. In this paper, four simple and reasonable design formulae, based on the first mode of the base-isolated structures, for the lateral force distribution on isolated structures have been validated by a multiple-bay three-story base-isolated steel structure tested on the shaking table. Moreover, to obtain more accurate results for irregular structures in which higher mode contributions are more likely expected during earthquakes, another four inertial force distribution formulae are also proposed to include higher effects.

Dynamic characteristics and seismic behavior of prefabricated steel stairs in a full-scale five-story building shake table test program

2015 ◽  
Vol 44 (14) ◽  
pp. 2507-2527 ◽  
Author(s):  
Xiang Wang ◽  
Rodrigo Astroza ◽  
Tara C. Hutchinson ◽  
Joel P. Conte ◽  
José I. Restrepo
Keyword(s):  
Dynamic Characteristics ◽  
Seismic Behavior ◽  
Full Scale ◽  
Shake Table Test ◽  
Shake Table ◽  
Test Program ◽  
Story Building

Shake Table Test of Confined Brick Masonry Building

2011 ◽  
Vol 255-260 ◽  
pp. 689-693 ◽  
Author(s):  
Khan Shahzada ◽  
Akhtar Naeem Khan ◽  
Amr S. Elnashai ◽  
Amjad Naseer ◽  
M. Javed ◽  
...  
Keyword(s):  
Dynamic Test ◽  
Damage Mechanism ◽  
Brick Masonry ◽  
Shake Table Test ◽  
Masonry Building ◽  
Shake Table ◽  
Scaled Model ◽  
Constant Frequency ◽  
Response Modification Factor ◽  
Plane Failure

This paper presents the shake table test of a one-forth scaled model, representing a typical Pakistani three stories confined brick masonry building. The model was constructed following complete model similitude and subjected to a series of sinusoidal base motions of increasing amplitude at a constant frequency equivalent to the predominant frequency of JMA Kobe-1995 earthquake record. The dynamic test data was processed and analyzed to generate the force-deformation curve, ductility ratio and response modification factor of the system. A shear-dominated failure mode was observed. As expected, the ground storey was found to suffer more damage than the other two stories. Out-of-plane failure of walls and crushing of concrete in confining elements were also noted in the final test runs. Based on the damage mechanism and force-deformation characteristics, various performance levels are suggested.

Mechanisms to limit higher mode effects in a controlled rocking steel frame. 2: Large-amplitude shake table testing

2012 ◽  
Vol 42 (7) ◽  
pp. 1069-1086 ◽  
Author(s):  
Lydell Wiebe ◽  
Constantin Christopoulos ◽  
Robert Tremblay ◽  
Martin Leclerc
Keyword(s):  
Large Amplitude ◽  
Steel Frame ◽  
Shake Table ◽  
Shake Table Testing ◽  
Higher Mode Effects ◽  
Mode Effects
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