ORCID Profile
0000-0003-1562-3676
Current Organisations
Amirkabir University of Technology
,
Griffith University
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Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 02-2012
Publisher: Elsevier BV
Date: 09-2015
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2017
Publisher: Wiley
Date: 04-06-2022
DOI: 10.1002/TAL.1945
Abstract: One of the structural engineers' challenges on a regular basis is balancing the expense of initial construction with the cost of future structural loss. At first appearance, employing the optimization method seems to be a viable option. However, since both the structure's analysis and design, as well as the computation of the cost of future loss, are time‐consuming and expensive, combining these processes with the costly optimization progression is prohibitively expensive. The purpose of this study is to present a methodology for the risk‐based optimum design of steel frame structures, as well as to enhance a previously published metaheuristic algorithm for a better optimization approach. The methodology given here allows structural designers to account for seismic risks in the design optimization process without incurring expensive computing expenditures. This approach may be appealing for practical work since it minimizes time‐consuming charges and provides designers with a structural impression. Furthermore, as compared to the standard version, the new optimization algorithm improves performance while decreasing computing costs. Bayesian linear regression is used in conjunction with a parameter identification challenge to derive probabilistic models for estimating structural analysis demand responses. The minimum amount of total initial cost and seismic loss cost is regarded as the objective function of the design of three chosen mid‐ to high‐rise moment frames for the optimization purpose. The results demonstrated enhanced optimization performance as well as a decreased loss cost for employed structures.
Publisher: SAGE Publications
Date: 02-2012
DOI: 10.1260/1369-4332.15.2.231
Abstract: In this article, it is intended to find a proper spectral Intensity Measure parameter (IM), using Bayesian statistics, to estimate the seismic demand of steel moment-resisting frames in such a way that applying this IM to both parts of seismic demand estimation, i.e. the probabilistic seismic demand model and collapse fragility curve, leads to a precise estimation for all frames with different heights. After results show that finding such IM parameter is impossible among spectral accelerations in idually, due to effects of different modes and nonlinear behavior of structures, the area under the spectral acceleration is introduced as a new IM. Considering the results of incremental dynamic analysis of frames subjected to 80 selected ground motion records, on the condition of selecting a suitable interval of periods, this new IM can reduce the dispersion of results. This interval can be defined as [αT m -βT 1 ], in which T 1 and T m are the first period and the period with 95% mass participation and α and β are two modification coefficients.
Publisher: Informa UK Limited
Date: 26-09-2016
Publisher: Thomas Telford Ltd.
Date: 06-2013
Abstract: The presence of inherent randomness as well as parametric uncertainty in related hydraulic models is known to be a weakness in using deterministic empirical equations for calculating bridge pier scour. The concept of system reliability assessment is a key to overcome this problem and the main focus of this concept is to determine a desirable safety margin for bridges against scour. Among different classical methods for reliability assessment, the Bayesian network (BN) has shown promise in systems with event chains such as scouring at bridge sites. Graphical charts and reasoning relations between all events in addition to a Bayesian formulation are the main characteristics used in this paper to conduct a new application of a BN in an assessment of bridge failure due to scour. This analysis permits examination of a very complex system of interactions and processes that are not well understood. The method is illustrated by analysing a combination of local and contraction scouring at a bridge section. Increase in reliability by using riprap around a bridge pier is also included in the analysis. A comprehensive comparison of BNs and fault trees is also presented.
Publisher: Elsevier BV
Date: 09-2016
Publisher: Wiley
Date: 20-11-2014
DOI: 10.1002/TAL.1048
Publisher: Wiley
Date: 24-03-2015
DOI: 10.1002/TAL.1210
Publisher: Wiley
Date: 02-09-2011
DOI: 10.1002/TAL.720
Publisher: Wiley
Date: 30-03-2018
DOI: 10.1002/TAL.1464
Publisher: Elsevier BV
Date: 08-2011
Publisher: Elsevier BV
Date: 08-2018
Publisher: Japan Concrete Institute
Date: 2005
DOI: 10.3151/JACT.3.95
Publisher: Elsevier BV
Date: 07-2016
Publisher: Wiley
Date: 08-07-2016
DOI: 10.1002/TAL.1290
Publisher: MDPI AG
Date: 13-09-2018
Abstract: The performance of base-isolated steel structures having special moment frames is assessed. The archetypes, which are designed per ASCE/SEI 7–2016, are simulated in the Finite Element (FE) computational platform, OpenSees. Adopting nonlinear dynamic analyses using far-field ground motions, the performance of Drift-Sensitive Structural Components (DS-SC), and Drift-/Acceleration-Sensitive Non-Structural Components (DS/AS NSC) at slight, moderate, extensive, and collapse damage states are investigated. The effects of structural height, effective transformed period (Teff), response modification coefficient (RI), and isolation type on the performance of 26 archetypes mounted on Lead Rubber Bearings (LRBs) and Triple Concave Friction Pendulums (TCFPs) are evaluated. Computing 50-year probability of exceedance using the fragility curves and seismic hazard curves of the site, increasing Teff reduces the role of RI in the structural performance variations in the height, as well as RI, do not affect the risk of damages to the AS-NSC the risk of collapse is not sensitive to the variations of Teff. The TCFP systems represent superior performance than LRB systems in lower intensities. For longer periods and taller structures, the isolation type has less effect on the performance of NSC. Finally, the archetypes have less than 1% risk of collapse in 50 years nevertheless, high-rise structures with RI = 2.0 have more than 10% probability of collapse given the maximum earthquake.
Publisher: SAGE Publications
Date: 11-10-2015
Abstract: The current investigation has been conducted to examine the effect of the vertical component of earthquake on the responses of base-isolated structures mounted on a triple concave friction pendulum (TCFP) bearing. The varying inherent stiffness and d ing of this new generation of friction isolators make smart behavior to mitigate damages during different earthquake hazard levels. To investigate, the structure was idealized as a two-dimensional single story (single degree of freedom) resting on a TCFP isolator and the coupled differential equations of motion were derived and solved using state-space formulation. Based on these equations, a computer program was developed to study the influence of the vertical component of earthquake on the seismic responses of a TCFP isolated structure such as bearing displacement and base shear of the isolated structure. The variation of essential parameters such as superstructure period, isolation period and friction coefficient of sliding bearing surfaces was studied when the TCFP isolated structure was subjected to seven near field earthquake motions. This study demonstrates the significant effects of the vertical component of earthquakes on seismic responses of base-isolated structure mounted on TCFP bearings, which is why the maximum error caused by neglecting the vertical component of earthquake in calculating the base shear of the structure is 29.5%.
Publisher: Research, Society and Development
Date: 20-03-2022
Abstract: This paper focuses on seismic responses of a 30-story high-rise building with a dual lateral system of Reinforced Concrete (RC) core shear wall and steel moment frame. To assess the seismic performance of the building, a nonlinear finite element model is built by using the OpenSees software. This three-dimensional model is created by using the fiber-beams for members and multi-layer shell elements for RC core walls. The numerical simulation has been examined under the thirteen sets of strong ground motion records which are scaled with the design and maximum seismic levels, Design-Basis Earthquake (DBE) and Maximum Considered Earthquake (MCE) level hazards respectively. In consequence, the desirable performance of high-rise steel moment frame building with RC shear core consisting of coupling beams and rectangular shear walls is shown. The outcome of nonlinear time history analyses reports the acceptable seismic performance of tall buildings designed. Results showed that maximum inter-story drift is significantly lower than allowable drift. Also, the RC core wall absorbed almost two-third of the total shear forces from the base level to one-third of height. However, the shear values of the core wall were significantly reduced by increasing the height while the shear values of the steel moment frame stayed constant.
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 08-2011
Publisher: Informa UK Limited
Date: 23-05-2023
Location: Iran (Islamic Republic of)
No related grants have been discovered for Mehdi Banazadeh.