Shaking Table Tests of a Four-Story Miniature Steel Building— Model Validation

2006 ◽  
Vol 22 (3) ◽  
pp. 755-780 ◽  
Author(s):  
Mario E. Rodríguez ◽  
José I. Restrepo ◽  
John J. Blandón
Keyword(s):  
Dynamic Response ◽  
Analytical Model ◽  
Shaking Table ◽  
Experimental Program ◽  
Shake Table ◽  
Base Shear ◽  
Shake Table Tests ◽  
Nonlinear Dynamic Response ◽  
Building Model ◽  
High Level

This paper discusses an analytical model developed to study the linear and nonlinear dynamic response of a four-story steel miniature building subjected to low-level and high-level shake table tests inducing nominally elastic and inelastic response, respectively. The analytical model was calibrated and validated against the results of the experimental program. A comparison of measured and calculated responses is made in the paper. Of particular interest, absolute floor accelerations were found more sensitive to high-frequency content than other response parameters such as base shear force and overturning base moment. The seismic performance of gravity-dominated beams is also examined in this paper. It was found that the cumulative nature of rotation demands in this type of beams should be considered in seismic design. The model is also used to observe differences in dynamic response of buildings when subjected to shake table tests with low fidelity in the reproduction of earthquake records.

scholarly journals Shake Table Tests of a Novel Low-rise Bolt-Assembled Precast Concrete Sandwich Wall Panel Structure

2022 ◽  
Author(s):  
Feng Xiong ◽  
Wen Chen ◽  
Qi Ge ◽  
Jiang Chen ◽  
Yang Lu
Keyword(s):  
Seismic Performance ◽  
Precast Concrete ◽  
High Strength ◽  
Shake Table ◽  
Wall Panel ◽  
Base Shear ◽  
Earthquake Excitation ◽  
Shake Table Tests ◽  
Sandwich Wall ◽  
Sandwich Wall Panel

Abstract A novel low-rise bolt - assembled precast concrete sandwich wall panel structure for rural residential houses was proposed, in which the connections between wall and wall, and wall and floor were connected by high strength bolts and steel plates. The bolt joints can be easily installed and disassembled. They are replaceable to make the precast structure demountable and reassembled. All the components are connected together by the novel bolted connectors. This paper presents the shake-table tests of a full-scale two-story bolt-assembled precast concrete sandwich wall building. The results indicated that the proposed structural system had good seismic performance and remained in the elastic stage with no damage after 9-degree rare earthquake excitation for the Model-1. The Model-2 exhibited excellent capacity and performed satisfactorily under the excitation up to 0.8 g. Cracks were observed at the wall openings and the base of walls and columns, which was similar to that of a cast-in-situ structure. The damage statuses were mainly light damage and moderate damage. The bolt connection joints were not anti-seismic weak places and had good seismic performance. Equivalent base shear method is suitable for estimating the seismic demand of the proposed precast concrete sandwich wall panel structure.

scholarly journals Shake Table Testing of Standard Cold-Formed Steel Storage Rack

2021 ◽  
Vol 11 (4) ◽  
pp. 1821
Author(s):  
Ahmad Firouzianhaji ◽  
Nima Usefi ◽  
Bijan Samali ◽  
Peyman Mehrabi
Keyword(s):  
Ground Motion ◽  
Concrete Block ◽  
Design Guidelines ◽  
Full Scale ◽  
Experimental Program ◽  
Shake Table ◽  
Shake Table Tests ◽  
Actual Performance ◽  
Cold Formed Steel ◽  
The Time Domain

Full-scale shake table investigations are strongly required to understand the actual performance of storage racks and to improve the rack design guidelines. This paper presents the results of full-scale shake table tests on New Zealand standard storage rack frames with two-bay and two-level to determine the dynamic characteristics of a standard rack structure and to measure the damping of the system. The experimental program was conducted in three phases. First, the identification parameters including the natural frequency and damping of the system were determined through a series of preliminary tests. Then, shake table tests were performed to capture the inelastic response of rack frames under low to medium intensities of El-Centro ground motion. Finally, the shake-table tests were repeated with scaling down the time domain and broader ranges of ground motion intensities to consider the performance of taller rack systems. In addition, a comprehensive discussion on the damping of the system is also provided based on the test results. The performance of the rack frame is described through an extensive set of measurements, including rack displacement, pallet sliding, the acceleration of a concrete block and rack frame and the damping of the system in the down-aisle direction. The results indicate that the standard rack frames are able to endure large inelastic deformations without loss of stability.

scholarly journals Nonlinear Vibrations in Homogeneous Non-Prismatic Timoshenko Cantilevers

2021 ◽  
Author(s):  
Navid Navadeh ◽  
Pooya Sareh ◽  
Vladimir G. Basovsky ◽  
Irina M. Gorban ◽  
Arash S. Fallah
Keyword(s):  
Dynamic Response ◽  
Analytical Model ◽  
Timoshenko Beam ◽  
Nonlinear Oscillations ◽  
Vibration Modes ◽  
Cantilever Beams ◽  
Nonlinear Dynamic Response ◽  
Beam Motion ◽  
The Mathematical Model ◽  
Special Case

Abstract Deep cantilever beams, modelled using Timoshenko beam kinematics, have numerous applications in engineering. This study deals with the nonlinear dynamic response in a non-prismatic Timoshenko beam characterized by considering the deformed configuration of the axis. The mathematical model is derived using the extended Hamilton's principle under the condition of finite deflections and angles of rotation. The discrete model of the beam motion is constructed based on the finite difference method (FDM), whose validity is examined by comparing the results for a special case with the corresponding data obtained by commercial finite element (FE) software ABAQUS 2019. The natural frequencies and vibration modes of the beam are computed. These results demonstrate decreasing eigenfrequency in the beam with increasing amplitudes of nonlinear oscillations. The numerical analyses of forced vibrations of the beam show that its points oscillate in different manners depending on their relative position along the beam. Points close to the free end of the beam are subject to almost harmonic oscillations, and the free end vibrates with a frequency equal to that of the external force. When a point approaches the clamped end of the beam, it oscillates in two-frequency mode and lags in phase from the oscillations of the free end. The analytical model allows for the study of the influence of each parameter on the eigenfrequency and the dynamic response. In all cases, a strong correlation exists between the results obtained by the analytical model and ABAQUS, nonetheless, the analytical model is computationally less expensive.

Study on 3-D Measurement Method for Structural Dynamic Displacement in Shake Table Tests Using Image Processing

2002 ◽  
Author(s):  
Satoshi Fujita ◽  
Osamu Furuya ◽  
Yasushi Niitsu ◽  
Tadashi Mikoshiba ◽  
Hiroaki Yamazaki
Keyword(s):  
Image Processing ◽  
Measurement System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Dynamic Measurement ◽  
Shake Table ◽  
Shake Table Tests ◽  
3 Dimensional ◽  
Building Model ◽  
Real Scale

This study has been examined about a 3-dimensional measurement method suitable for a fracturing test of real scale model using shake table test, and has proposed the measurement system using image processing. Although this measurement system is based on a simple theory of measurement, it is a very convenient system which only requires to install the markers on the object structure and it can be considered as the most suitable measurement system to evaluate the complex 3-dimensional behavior of real scale structure. Fundamental hardware and software in measurement system has been constructed until now. Moreover, the fundamental dynamic measurement accuracy and effectiveness of the proposed measurement system has been confirmed from the shake table tests using the 5-storey building model in elastic region. This paper describes the dynamic measurement accuracy, the effectiveness of the proposed system and the evaluation for practical use from the results of shake table tests using the collapse building model and the wooden house model.

scholarly journals Numerical Modelling of CFS Three-Story Strap-Braced Building under Shaking-Table Excitations

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 118
Author(s):  
Alessia Campiche
Keyword(s):  
Numerical Modelling ◽  
Seismic Behavior ◽  
Numerical Models ◽  
Dynamic Properties ◽  
Shaking Table ◽  
Shake Table ◽  
Shake Table Tests ◽  
Research Activities ◽  
Story Drift ◽  
Cold Formed Steel

In recent research activities, shake-table tests were revealed to be useful to investigate the seismic behavior of cold-formed steel (CFS) buildings. However, testing full-scale buildings or reduced-scale prototypes is not always possible; indeed, predicting tools and numerical models could help designers to evaluate earthquake response. For this reason, numerical modelling of two strap-braced prototype buildings, recently tested on shake-table at University of Naples Federico II in cooperation with Lamieredil S.p.A. company, was developed. The models were validated trough the comparison between experimental and numerical results, in term of dynamic properties (fundamental period of vibration and modal shapes), peak roof drift ratios and peak inter-story drift ratios. Although dynamic properties of mock-ups were captured with accuracy by the developed models, the comparison highlighted the need to consider accumulation of damage and rocking phenomenon in the modelling to capture with good accuracy the seismic behavior of CFS strap-braced building, subjected to high intensity records.

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