Month: July 2023

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The effect of the dimensions and locations of the openings and the influence of inclination on dynamic response of nine Persian historical brick masonry minarets constructed in the eleventh to fourteenth centuries is studied. The operational modal test was performed on a minaret constructed in the laboratory and the frequencies were obtained by the ARTeMIS software, and the ANSYS software was used for updating its finite element model. A range was determined for the values of the modulus of elasticity and bulk density to obtain acceptable ranges for the frequencies of the minarets. Then finite element model updating of the historical minarets was performed to determine their frequencies. Several dimensions and locations were assumed for the openings and two inclination angles were considered to study their effect on the frequencies. Minarets were then subjected to earthquakes in order to investigate the effect of openings and inclination on their seismic response.

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Insufficient self-centering behavior and limited energy dissipation capacity have been identified as contributing factors to building collapses in earthquake scenarios. To enhance post-earthquake recoverability, a function-recoverable system incorporating self-centering energy-dissipation (SCED) column bottom joints has been implemented. This study focuses on analyzing the Light Self-Centering Bottom Joint (LSCBJ) of the rocking truss through parametric simulation. A Buckling Restraint Steel Plate (BRSP) is introduced at the column bottom joint of the moment-resisting frame to absorb seismic energy. Its performance is evaluated based on the thickness ratio (α), width ratio (β), and axial stiffness ratio (ω) between the BRSP and the frame column flange. Finite element models demonstrate the analysis process, validated using a quasi-static test. Findings show significant improvement in the seismic performance of LSCBJs compared to conventional rigid bottom joints. Optimal structural performance is achieved with α = 0.80, β = 0.5, and ω in the range of 0.3-0.5. Additionally, the plastic energy dissipation of BRSP accounts for over 80% of the total dissipated energy.

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In this paper, a novel metallic energy dissipation device named wheel shaped damper (WSD) is proposed. The WSD mainly consists of the ring plate with spoke, moving plate and fixed bottom plate, which in the damper is the energy dissipation element by yielding the rings with spokes. For this purpose, a numerical study was performed using the finite element method through ABAQUS. A total of 12 WSD models were cyclically analyzed under quasi-static. Study parameter variables included thickness rings, number of rings, number of spokes, spoke thickness, and width on the behavior of WSD. Also, validation experiment was performed on experimental dual damper for finite element model. The results show that the WSD has stable hysteretic behavior, excellent energy dissipation capabilities, ductility factor and desirable displacement capacity. As a result, the energy absorption capacity of the WSD increased with the increase of all parameters, including the number of rings, the spokes (reinforcement plates), spoke thickness, width, and ring thickness. Overall, the results indicate that the new damper is far more efficient at absorbing energy than a conventional pipe damper and is several times more effective. Equations were extracted for WSD in order to estimate the capacity of the energy absorption characteristics. A good agreement was observed between results obtained of the equations and FE Method. The analyses illustrate that the WSD can significantly enhance the structural seismic performance..

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