Seismic design and assessment of structures with viscous dampers at limit state levels: Focus on probability of damage in devices

Abstract

During large earthquakes, the seismic demand of viscous dampers may exceed their capacity. In this regard, current design codes must consider extreme conditions and preserve the damper at limit state levels. Here, by adjusting the damping coefficient, a procedure is introduced to mitigate device damages during severe earthquakes. To assess the procedure, 15 special moment resisting frames with a different number of stories (two, four, and eight) were designed by three methods: The recommended novel procedure, the seismic provisions of ASCE7, and the procedure proposed by Miyamoto et al. [1] for structures, installed with supplemental damping devices. A series of incremental dynamic analyses were then performed by modeling the limit state behavior of viscous dampers. Results indicated that the novel method reduces the damage probability of dampers as well as the maximum demands on the structure at different seismic hazard levels.

A Multi-Objective Displacement-Based Design Procedure of Viscous and Hysteretic Damped Braces for the Seismic Protection of Rc Buildings

“…A six-storey RC framed structure (Figure 5a), representative of the residential buildings constructed in Italy during the 1990s, is selected from the RINTC project [13]. It is located in L'Aquila and designed as bare frame for a medium-risk zone, in line with provisions of the Italian code DM86 [18], assuming concrete with cylindrical compressive strength of 25 MPa and steel reinforcement with yield strength of 430 MPa. Columns with rectangular crosssection, oriented as shown in Figure 5b, are tapered along the height, considering: 0,3×0,6 m 2 at the first two levels; 0,30×0,5 m 2 at the third and fourth levels; 0,3×0,4 m 2 at the fifth and roof levels.…”

Evaluación del desempeño sísmico de los planos modificados del Hospital Luis Negreiros Vega - Callao, aplicando disipadores de fluido viscoso en disposición diagonal y Chevron

“…Por otro lado, realizó diversas pruebas con diferentes valores de ⍺, dando como conclusión, que con los valores de ⍺ = 0.25, se produce un óptimo amortiguamiento efectivo. Sepehri et al (2018), se basa en la mejora del rendimiento sísmico aplicando el amortiguador fluido viscoso (FVD). Este tiene un aporte significativo relacionado a la deriva y las aceleraciones.…”