scholarly journals EXPERIMENTAL STUDIES OF A STEEL FRAME MODEL WITH AND WITHOUT BUCKLING-RESTRAINED BRACES

2016 ◽  
pp. 33-52 ◽  
Author(s):  
Héctor Guerrero Bobadilla ◽  
Tianjian Ji ◽  
José Alberto Escobar
Keyword(s):  
Free Vibration ◽  
White Noise ◽  
Experimental Studies ◽  
Steel Frame ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Frame Model ◽  
Seismic Input ◽  
Low Intensity ◽  
Vibration Tests

This paper presents comparative experimental studies of a five-storey steel-frame model at a scale of 1/10 with, and without, buckling-restrained braces (BRBs). The building model was subjected to free vibration tests and shaking table tests. The latter were conducted using low-intensity white noise and seismic input. From the free vibration tests and shaking table tests with low-intensity white noise, it was found that the BRBs contributed a significant amount of damping. This happened to the model even at low levels of vibration. The shaking table tests with seismic input were conducted using seven earthquake records, taken in the lakebed zone of Mexico City with seismic intensities from pga=0.1g to 0.25g. At an intensity of pga=0.1g, the results show that the model fitted with BRBs had a significantly smaller response than the bare model, in terms of displacement, inter-storey drift, floor velocity and floor acceleration. The higher intensities were only applied to the model fitted with BRBs. The results indicate that the model with BRBs was able to withstand about 2.5 times the seismic intensity of the bare model, in terms of lateral displacement, inter-storey drift and Arias Intensity, as a measure of the energy contents of the movement. At the end of the tests, all BRBs were removed and the model remained in its original undamaged state.

Research on Shaking Table Test of Base and Story Isolation Structures

2014 ◽  
Vol 580-583 ◽  
pp. 1776-1781
Author(s):  
Guo Chen Zheng ◽  
Hang Li Xu
Keyword(s):  
Natural Vibration ◽  
Shaking Table Test ◽  
Steel Frame ◽  
Shaking Table ◽  
Seismic Structure ◽  
Shaking Table Tests ◽  
Frame Model ◽  
Isolation Layer ◽  
Damping Effect ◽  
Scale Down

The shaking table tests are conducted on a 5-floor steel frame model with a scale down of 1:6. The traditional anti-seismic structure and isolation structures with isolation layer in different position are adopted. The results indicate that the natural vibration periods of isolation structure are longer than anti-seismic structure, and when the isolation layer is located in a lower position, the period becomes longer and the damping effect is better.

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.

Shaking Table Tests on a Passive Equipment Isolation System for Earthquake Protection

2009 ◽  
Author(s):  
Maurizio De Angelis ◽  
Salvatore Perno ◽  
Anna Reggio ◽  
Gerardo De Canio ◽  
Nicola Ranieri
Keyword(s):  
Steel Frame ◽  
Shaking Table ◽  
Frame Structure ◽  
Shaking Table Tests ◽  
Isolation System ◽  
Industrial Plants ◽  
Steel Frame Structures ◽  
Rigid Mass ◽  
Passive Isolation ◽  
Steel Frame Structure

The present work refers to steel frame structures in industrial plants. A passive isolation system for seismic protection of a considerable equipment, already present on a frame support structure and rigidly constrained to it, is investigated through both numerical simulations (1+1 DOF system) and shaking table tests on a 1:5 scale two-story steel frame structure. The equipment (e.g. a pipeline, a compressor unit, ...) is modelled as a rigid mass. The optimal design is determined by minimizing the dynamic response of the isolated mass. In order to ensure strenght and serviceability, the response of the frame is also monitored.

Representation of Soil-Foundation Systems and Its Application to Shaking Table Tests by Constructing a Mechanical Interface

2013 ◽  
Vol 29 (2) ◽  
pp. 547-571
Author(s):  
Masato Saitoh ◽  
Tomoya Saito ◽  
Toshifumi Hikima ◽  
Makoto Ozawa ◽  
Keiichi Imanishi
Keyword(s):  
Experimental Studies ◽  
Pile Group ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Soil Medium ◽  
Lumped Parameter ◽  
Mechanical Interface ◽  
Foundation Model ◽  
Soil Foundation ◽  
Impedance Functions

Experimental studies on the dynamic response of structures comprising soil-foundation systems require an appropriately constructed soil-foundation model below the superstructures in order to properly estimate structural responses. In most studies, applying a small scaling is necessary for constructing the entire structural system, since there is limited space on shaking tables. This constraint has been a hindrance in experimental studies. Thus this study proposes a mechanical interface (MI) that represents the impedance characteristics of a 3 × 5 pile group embedded in a layered soil medium. The MI is constructed on the basis of lumped parameter models with gyro-mass elements. This element is mechanically realized in the MI using a rotational mass in combination with coupling gears. The results show that the MI properly simulates the impedance functions with frequency-dependent oscillations, and shaking table tests using the MI for an inelastic structure are demonstrated.

Shaking table tests of steel frame with superelastic Cu–Al–Mn SMA tension braces

2015 ◽  
Vol 45 (2) ◽  
pp. 297-314 ◽  
Author(s):  
Yoshikazu Araki ◽  
Kshitij C. Shrestha ◽  
Nao Maekawa ◽  
Yuji Koetaka ◽  
Toshihiro Omori ◽  
...  
Keyword(s):  
Steel Frame ◽  
Shaking Table ◽  
Shaking Table Tests

scholarly journals Shaking Table Test on Different Positions of Multiple Tuned Liquid Damper

2019 ◽  
Vol 9 (1) ◽  
pp. 5863-5867
Keyword(s):  
Control System ◽  
Wave Breaking ◽  
Passive Control ◽  
Shaking Table Test ◽  
Steel Frame ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Tuned Liquid Damper ◽  
Passive System ◽  
Water Tanks

Earthquake can cause many problems to the structures, which lead to buildings collapse and may takes humans life. It is a nature’s hazard that cannot be stop. One of the effort is by introducing the damping system to the buildings where the energy of the system is slowly reduced until the vibration of the system is totally eliminated and the system is brought to rest. Several techniques are available nowadays, however passive control system has advantage in term of cost compare to other systems. Multiple Tuned Liquid Damper (MTLD) is a passive system that traditionally made of several rigid tanks filled with water, usually placed on top of a building. The energy will dissipates through the sloshing and wave-breaking of the liquid once the earthquake strike the buildings. Shaking table tests are carried out on a two-bay, two-story steel frame with water tanks for different location. In this test, the displacement and acceleration for top and base are studied.

Experimental Studies on Earthquake Response Behavior of Cylindrical Tanks

1987 ◽  
Vol 109 (1) ◽  
pp. 50-57 ◽  
Author(s):  
H. Zui ◽  
T. Shinke ◽  
A. Nishimura
Keyword(s):  
Seismic Behavior ◽  
Experimental Studies ◽  
Shaking Table ◽  
Earthquake Response ◽  
Test Results ◽  
Dynamic Tests ◽  
Shaking Table Tests ◽  
Liquid Storage ◽  
Cylindrical Tanks ◽  
Significant Factors

A series of dynamic tests for the seismic behavior of ground-supported liquid storage tanks are evaluated and compared with previous theoretical studies. Two model tanks were subjected to shaking table tests with particular attention to the influence of base fixity and geometric imperfections in the tank walls. Test results support numerical calculations which show that base fixity conditions strongly influence the seismic response of tanks. Although high radial accelerations are induced by the imperfections, they are not found to be significant factors in tank failure.

scholarly journals On the Optimum Placement of Dissipators in a Steel Model Building Subjected to Shaking-Table Tests

2014 ◽  
Vol 8 (1) ◽  
pp. 142-152 ◽  
Author(s):  
Dora Foti
Keyword(s):  
Model Building ◽  
Shaking Table ◽  
Friction Damper ◽  
Shaking Table Tests ◽  
Earthquake Simulation ◽  
Friction Dampers ◽  
Optimum Placement ◽  
Vibration Tests ◽  
Reduced Scale ◽  
Previous Experimental Study

The following research presents the numerical and experimental results obtained on a reduced scale steel model of a medium-rise building structure dynamically protected with energy dissipaters. The steel-steel friction dissipates energy as the structure undergoes interstory drifts. A preliminary numerical analysis is performed to determine the best position of the friction dampers in the longitudinal frames. All the nodes of the numerical model have been assumed with the same bending stiffness. Shaking table tests have been performed, both in random vibration tests (to determine the natural periods and the dynamic characteristics of the model) and in earthquake simulation tests (to study the dynamic behaviour of the model with and without dampers). The results have been compared to those achieved during a previous experimental study based on the same model protected with only one friction damper for each longitudinal frame.

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