Seismic Rocking Response of a Triangular Building Founded on Sand

1987 ◽  
Vol 3 (4) ◽  
pp. 793-809 ◽  
Author(s):  
G. Bongiovanni ◽  
M. Celebi ◽  
E. Safak
Keyword(s):  
System Identification ◽  
Free Vibration ◽  
Mathematical Models ◽  
Excellent Performance ◽  
Central Chile ◽  
Concrete Building ◽  
Chile Earthquake ◽  
Modes Of Vibration ◽  
Vibration Tests ◽  
Identification Techniques

A twenty-two story, triangular in plan, symmetrical, reinforced concrete building on the beachfront in Vin~a del Mar, Chile, was temporarily instrumented in August 1985 following the 3 March 1985 Central Chile earthquake ( Ms = 7.8) and aftershocks were recorded. Ambient and free vibration tests were also performed. The paper reports studies of the records of the responses of the building, the primary modes of vibration of the structure, its excellent performance during the earthquake and results from analyses using mathematical models and system identification techniques.

scholarly journals Steady state vibration tests of a six-storey reinforced concrete building

1971 ◽  
Vol 4 (1) ◽  
pp. 94-107
Author(s):  
A. M. Reay ◽  
R. Shepherd
Keyword(s):  
Steady State ◽  
Reinforced Concrete ◽  
Fold Increase ◽  
Longitudinal Direction ◽  
Torsional Mode ◽  
Reinforced Concrete Building ◽  
Concrete Building ◽  
Modes Of Vibration ◽  
Vibration Tests ◽  
Free Beam

Five modes of vibration of a six-storey reinforced concrete building were excited by steady-state resonance testing. Good correlation between predicted and measured frequencies was obtained. In the lateral translation tests, two translation modes and the vibration of the roof as a free-free beam were excited. Damping measured in the fundamental mode was 4.1% critical and the average contribution of foundation compliance to the top-storey deflection was 32%. Damping in the second translation mode was 6.6% and of the free-free beam vibration, 3.6%. The first torsional mode of the building was excited, and for an eight-fold increase in excitation force, the natural frequency reduced by 1.2%, indicating a slight degree of non-linearity in the response. Damping in this mode was 6.9% , no change being noted for the eight-fold force increase. In the longitudinal direction, two modes were excited, the first torsional mode and the first longitudinal translation mode. Properties of the former were similar to those determined from the torsional response test. Damping in the translation mode was 10.1% and the foundation compliance contributed 24% of the top-storey deflection.

scholarly journals Effects of Precast Cladding Systems on Dynamic Characteristics of Steel Frame Buildings by Ambient and Free Vibration Tests

2017 ◽  
Vol 2017 ◽  
pp. 1-20 ◽  
Author(s):  
Jun Ma ◽  
Shinji Nakata ◽  
Akihito Yoshida ◽  
Yukio Tamura
Keyword(s):  
Free Vibration ◽  
Dynamic Characteristics ◽  
Steel Frame ◽  
Ambient Vibration ◽  
Test Cases ◽  
Vibration Method ◽  
External Wall ◽  
Wide Range ◽  
Cladding Panels ◽  
Vibration Tests

Full-scale tests on a one-story steel frame structure with a typical precast cladding system using ambient and free vibration methods are described in detail. The cladding system is primarily composed of ALC (Autoclaved Lightweight Concrete) external wall cladding panels, gypsum plasterboard interior linings, and window glazing systems. Ten test cases including the bare steel frame and the steel frame with addition of different parts of the precast cladding system are prepared for detailed investigations. The amplitude-dependent dynamic characteristics of the test cases including natural frequencies and damping ratios determined from the tests are presented. The effects of the ALC external wall cladding panels, the gypsum plasterboard interior linings, and the window glazing systems on the stiffness and structural damping of the steel frame are discussed in detail. The effect of the precast cladding systems on the amplitude dependency of the dynamic characteristics and the tendencies of the dynamic parameters with respect to the structural response amplitude are investigated over a wide range. Furthermore, results estimated from the ambient vibration method are compared with those from the free vibration tests to evaluate the feasibility of the ambient vibration method.

Characterization of hydrodynamic properties from free vibration tests of a large-scale bridge model

2021 ◽  
Vol 106 ◽  
pp. 103368
Author(s):  
Thomas Schumacher ◽  
Alaa W. Hameed ◽  
Christopher Higgins ◽  
Brittany Erickson
Keyword(s):  
Free Vibration ◽  
Large Scale ◽  
Hydrodynamic Properties ◽  
Bridge Model ◽  
Vibration Tests

Frequency-Domain System Identification Techniques for Experimental and Operational Modal Analysis

2003 ◽  
Vol 36 (16) ◽  
pp. 1609-1614 ◽  
Author(s):  
Patrick Guillaume ◽  
Peter Verboven ◽  
Bart Cauberghe ◽  
Steve Vanlanduit ◽  
Eli Parloo ◽  
...  
Keyword(s):  
System Identification ◽  
Modal Analysis ◽  
Frequency Domain ◽  
Operational Modal Analysis ◽  
Identification Techniques
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