scholarly journals Seismic reliability assessment of a non-seismic reinforced concrete framed structure designed according to ABNT NBR 6118:2014

2022 ◽  
Vol 15 (1) ◽  
Author(s):  
Eduardo Marques Vieira Pereira ◽  
Gustavo Henrique Ferreira Cavalcante ◽  
Isabela Durci Rodrigues ◽  
Luiz Carlos Marcos Vieira Júnior ◽  
Gustavo Henrique Siqueira
Keyword(s):  
Reinforced Concrete ◽  
Reliability Assessment ◽  
Northeastern Brazil ◽  
Building Performance ◽  
Limit States ◽  
Seismic Reliability ◽  
Probabilistic Seismic Demand Analysis ◽  
Probabilistic Seismic Demand ◽  
Design Requirements ◽  
Immediate Occupancy

abstract: Due to the paucity of studies regarding the seismic assessment of buildings in Brazil, this study aims to present and discuss a seismic reliability assessment of a reinforced concrete framed structure designed according to the Brazilian standard ABNT NBR 6118:2014 without the consideration of the seismic design requirements of ABNT NBR 15421:2006. Herein, fragility functions are generated through probabilistic seismic demand analysis, and integrated with hazard curves for Northeastern Brazil to generate regional failure probability maps for three limit-states: Immediate Occupancy (IO), Life Safety (LS), and Collapse Prevention (CP). The results indicated that the building performance is adequate for IO; however, for LS and CP, an unacceptable performance is observed.

Design Algorithm Based on Probabilistic Seismic Demands for Buildings Rehabilitated with Hysteretic Energy-Dissipating Devices

2004 ◽  
Vol 20 (2) ◽  
pp. 503-521 ◽  
Author(s):  
Marco Antonio Torres ◽  
Sonia E. Ruiz
Keyword(s):  
Reinforced Concrete ◽  
Demand Analysis ◽  
Seismic Demand ◽  
Seismic Demands ◽  
Design Algorithm ◽  
Hysteretic Energy ◽  
Probabilistic Seismic Demand Analysis ◽  
Concrete Building ◽  
Story Drift ◽  
Probabilistic Seismic Demand

A design algorithm based on a probabilistic seismic demand analysis is proposed for the rehabilitation of buildings with hysteretic energy dissipating devices (EDDs). The acceptance conditions imposed are referred to the maximum story drift developed by the building under rehabilitation, and to the maximum ductility demanded by the EDDs. The algorithm is successfully applied to a ten-story three-bay reinforced concrete building that is rehabilitated with steel U-type EDDs.

scholarly journals Displacement-Based Seismic Assessment of the Likelihood of Failure of Reinforced Concrete Wall Buildings

Buildings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 295
Author(s):  
Amirhossein Orumiyehei ◽  
Timothy J. Sullivan
Keyword(s):  
Reinforced Concrete ◽  
Seismic Risk ◽  
Concrete Wall ◽  
Limit States ◽  
Simplified Approach ◽  
Performance Based Assessment ◽  
Assessment Approach ◽  
Reinforced Concrete Wall ◽  
Displacement Based ◽  
Assessment Procedures

To strengthen the resilience of our built environment, a good understanding of seismic risk is required. Probabilistic performance-based assessment is able to rigorously compute seismic risk and the advent of numerical computer-based analyses has helped with this. However, it is still a challenging process and as such, this study presents a simplified probabilistic displacement-based assessment approach for reinforced concrete wall buildings. The proposed approach is trialed by applying the methodology to 4-, 8-, and 12-story case study buildings, and results are compared with those obtained via multi-stripe analyses, with allowance for uncertainty in demand and capacity, including some allowance for modeling uncertainty. The results indicate that the proposed approach enables practitioners to practically estimate the median intensity associated with exceeding a given mechanism and the annual probability of exceeding assessment limit states. Further research to extend the simplified approach to other structural systems is recommended. Moreover, the research highlights the need for more information on the uncertainty in our strength and deformation estimates, to improve the accuracy of risk assessment procedures.

Long-Term Deformations of Strengthened Reinforced Concrete Linear Elements

2016 ◽  
Vol 691 ◽  
pp. 51-60 ◽  
Author(s):  
Martin Krizma ◽  
Lubomir Bolha
Keyword(s):  
Reinforced Concrete ◽  
Long Term Results ◽  
Short Term ◽  
Limit States ◽  
Linear Elements ◽  
Repeated Load ◽  
The Moment ◽  
Concrete Elements ◽  
Fiber Fabric

The issue of strengthening the damaged linear reinforced concrete elements have been engaged since 2008. We focused on the analysis of resistance and the characteristics of limit states of serviceability in the damaged and subsequently strengthened elements at a short-term loading. In the introduction phase, the strengthening of the elements was carried out with the following procedures – installation of an overlayer on the coupling board or a combination of the board and use of glass – fiber fabric (GFRP). The strengthening was also affected by the type of contact (reinforced/non-reinforced) – the deformed element/coupling board and its effect on resistance, type of deformation and serviceability. In the non-reinforced contact, we applied some of the types of adjustments to the surface of the strengthened element. At the moment, we are dealing with the effects of time and repeated load on the strengthened elements. The results correspond to the reinforced contact. The values are compared with the short-term results of the strengthened beams and with the long-term results of the beams prepared for strengthening.

ESTIMATION OF THE FAILURE PROBABILITY OF A REINFORCED CONCRETE BEAM LYING ON A STOCHASTIC ELASTIC BASE WITH TWO PRESSURE COEFFICIENTS, ON AN INCLINED SECTION FROM THE LATERAL FORCE

2021 ◽  
Vol 93 (1) ◽  
pp. 16-25
Author(s):  
P.D. DEMINOV ◽  
Keyword(s):  
Reinforced Concrete ◽  
Failure Probability ◽  
Rational Functions ◽  
Lateral Force ◽  
Elastic Base ◽  
Strength Properties ◽  
Reinforced Concrete Beams ◽  
Total Probability ◽  
Limit States ◽  
Random Load

The estimate of failure probability on the inclined section from the action of transverse forces, as well as the total probability of the limit States of reinforced concrete beams with probabilistic strength parameters lying on an elastic Foundation model V.Z. Vlasov-P.L. Pasternak, possessing stochastic properties. Probabilistic characteristics of the transverse force and its distribution density are constructed for a Foundation beam resting on an elastic base with two random characteristics, loaded with a quasi-stationary random load, taking into account the probabilistic nature of the strength properties of concrete and reinforcement. It is shown that if the spectral densities of the bed and load coefficients are fractional rational functions, the deflection correlation functions and, accordingly, the deflection variance are calculated using the residue theory.

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