Reliability Analysis of Reinforced Concrete Structure with Shock Absorber Damper under Pseudo-Dynamic Loads

Abstract

Past historical earthquake events from neighbouring countries have been proven to be disastrous. Building in the aftermath of an earthquake may reduce structural reliability, posing risk upon re-occupation of the building. Shock absorber viscous dampers were installed on a specific structure storey that could reduce the spectral acceleration and storey-drift caused by an earthquake. The research object is a low-rise, three-storey, reinforced concrete (RC) structure. This study aims to identify the dynamic response of the scaled RC structure with and without attached dampers and performs structural reliability of the tested model under the excitation of Peak Ground Acceleration (PGA) of 0.1 g to 1.0 g with a unidirectional shaking table. APIDO viscous dampers were installed parallel to the movement direction of the dynamic load test. The findings show the scaled model with attached viscous dampers reduces spectral acceleration and storey drift by 9.66% and 4.85%, respectively. Findings also show the change of the structural behaviour from single curvature to double curvature due to the increase in seismic structural resistance by viscous dampers. The breakthrough of this research shows that structural reliability analysis performed by the Weibull distribution function has a base shear capacity increment of 1.29% and 6.90% in seismic performance level Life Safety (LS) and Collapse Prevention (CP), respectively. The novelty of this case study building with dampers managed to increase the building’s base shear and roof shear capacity by 6.90% and 16% compared to the building without dampers under dynamic load excitation.

Computational Aerodynamic Optimization of Wind-Sensitive Irregular Tall Buildings

“…It is observed from the RBF surface that potential optimal solutions can be obtained within the blue contours, which correspond to the maximum corner curving. In contrary, the opposite region with a minimum curving radius corresponds to maximum deflection values, and this evidence is supported by the fact that chamfering corners of building geometry can reduce wind loads on a structure significantly [4,5,[45][46][47][48]. One potential optimal solution for the modified building form is shown in Figure 19, illustrating the original and the new optimal boundaries of the aerodynamic modification applied through this optimization process.…”

“…It is observed from the RBF surface that potential optimal solutions can be obtained within the blue contours, which correspond to the maximum corner curving. In contrary, the opposite region with a minimum curving radius corresponds to maximum deflection values, and this evidence is supported by the fact that chamfering corners of building geometry can reduce wind loads on a structure significantly [4,5,[45][46][47][48]. the lower and upper bounds for the design variables, respectively, ∆ , , ∆ , is the max story drift value in the y and x direction, and ∆ , , ∆ , is the allowable limit as per a given standard; in this example, the Eurocode design code standard is adopted with a limit of H/500.…”

Seismic response of a mid-story-isolated structure considering soil–Structure interaction in sloping ground under three-dimensional earthquakes

“…The energy dissipation capacity of the vertical earthquake set on the 3D isolated bearing can be further enhanced compared with that on the traditional 2D isolated bearings. At the same time, the influence of different parameters of the vertical damper on the 3D isolated bearing should be further analyzed (Li et al, 2021;Yip et al, 2022). The coupling behavior of 3D isolated bearing stiffness in horizontal and vertical directions should be further considered.…”

Demolition Waste Potential for Completely Cement-Free Binders

“…This provides an increase in adhesion between the fresh cement matrix and aggregate grains of different fractions and nature, which can be arranged in a row according to the strength of the solution: quartz < limestone < clinker. Due to this, products prepared using concrete scrap improved physical and mechanical properties, including crack resistance and resistance to dynamic loads [ 30 , 31 , 32 , 33 , 34 ].…”