A Comparison between different techniques for optimum design of steel frames subjected to blast

Khaledy, Nima; Habibi, Alireza; Memarzadeh, Parham

doi:10.1590/1679-78254952

Cited by 7 publications

(3 citation statements)

References 24 publications

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“…During the short period of time of this positive phase, pressure decays towards zero, after which a negative phase takes place. Then, the suction pressure increases up to a peak underpressure value and it is subsequently restored to zero at the end of the negative phase (Needham, 2010;Khaledy et al, 2018).…”

Section: Definition and Load Functionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Plates Subjected to Explosive Loads

Reis

Burgos

Oliveira

2022

Lat. Am. j. solids struct.

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Blast loads have been increasingly studied in the past decades, especially regarding civil structures. Until recently, the negative phase of these loads has been disregarded, but studies concluded that the effect of suction must be included. In the case of plates, nonlinearity plays an important role, and the membrane effect should also be considered. This work focuses on the influence of nonlinearity in plates subjected to blast loads. Equations were developed for the calculation of blast load parameters, considering that positive and negative phases are approximated by the Friedlander equation and cubic polynomial, respectively. The plate is modeled as a SDOF system using von Karman's theory of large displacements. The development of the nonlinear dynamic differential equation is reviewed, considering a simply supported plate, and its solution is based on fourth order Runge-Kutta numerical method. A reference example is used as a benchmark and then parametric studies are conducted, in which the influence of scaled distance, mass of explosive, and the consideration or not of the negative phase is analyzed.

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Section: Definition and Load Functionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Plates Subjected to Explosive Loads

Reis

Burgos

Oliveira

2022

Lat. Am. j. solids struct.

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“…In both papers, the structures are modeled and analyzed using the Applied Element Method. Khaledy et al (2018) study the optimum design of 2D steel moment frames under blast loading using three techniques: Nonlinear Programming by Quadratic Lagrangian (NLPQL), Particle Swarm Optimization (PSO), and Multi Island Genetic Algorithm (MIGA). The weight of the structure is considered as the objective function and design variables are members' cross-sectional areas.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Framed Structures Subjected to Blast Loading Using Equivalent Static Loads Method

Al-Bazoon

Arora

2023

Preprint

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In this study, the optimum design of a three-dimensional framed steel structure subjected to blast loading is considered. The main idea of this research is to develop a practical formulation for the design optimization problem and to study the effect of including blast loads in the design process. The optimization problem is formulated to minimize the total weight of the structure subjected to American Institution of Steel Construction (AISC) strength requirements and blast design displacement constraints. The design variables for beams and columns are the discrete values of the W-shapes selected from the AISC tables. A car carrying 250 lbs of Trinitrotoluene with a 50 ft standoff distance from the front face is modeled as the source of the blast loading. Pressure-time histories are calculated on the front, sides, roof, and rear faces of the structure. Since the problem functions are not differentiable with respect to the design variables, the gradient-based optimization algorithms cannot be used to solve the problem. Therefore, metaheuristic algorithms are used to solve the optimization problem. Linear and nonlinear dynamic analyses are carried out in the optimization process. The problems are solved using metaheuristic optimization with the equivalent static loads method (MOESL). In MOESL, the dynamic load is transformed into equivalent static loads (ESLs) then the linear static analysis is carried out in the optimization process. The problems are 4-bay×4-bay×3-story frames under serviceability and blast loading. It is shown that a penalty on the optimum structural weight is substantial for designing structures to withstand blast loads.

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“…On the other hand, unbraced frame needs rigid beam-column connections to avoid very large displacement due to members' loss. Khaledy et al (2018) of the problem is not practical since the members cannot be directly selected from the AISC tables and the design code constraints cannot be imposed.…”

Section: Review Of Literaturementioning

confidence: 99%

Damage-tolerant optimal design of structures subjected to blast loading

Al-Bazoon¹

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An explosion is characterized as a sudden release of large energy over a very short duration. As the blast wave travels parallel to a surface, it creates a side-on pressure and when it hits a surface perpendicularly or at an angle, it creates a reflected pressure. Side-on pressure and reflected pressure are much higher than service loads for the structure. Thus, when a blast happens near a building that is not designed to withstand blast loads, it can cause catastrophic damage. The objective of this study is to present a formulation for the design optimization of framed steel structures subjected to blast loads. Also, a formulation is presented for the design optimization of structures that can withstand some possible damage due to blast loads. To this end, an optimization procedure that includes definitions of design variables, cost function, constraints, and structural analyses is discussed. The design variables for beams and columns are the discrete values of the W-shapes selected from American Institute of Steel Construction (AISC) tables. The optimization problem is to minimize the total structural weight subjected to AISC strength requirements and blast design displacement constraints. Linear static, linear dynamic, and nonlinear dynamic analyses are incorporated in the optimization process and optimum designs are compared. Due to design variables and some constraints discontinuity, gradient-based optimization algorithms cannot be used to solve the optimization problem. Therefore, metaheuristic algorithms are used that require only simulation results to solve problems with discrete variables and non-differentiable functions. Since the number of simulations and robustness to obtain good designs are important for the class of problems discussed in this research, a new hybrid optimization algorithm based on Harmony Search (HS) and Colliding Bodies Optimization (CBO) is developed and examined. The algorithm is named Hybrid Harmony Search-Colliding Bodies Optimization (HHC). Also, a novel design domain reduction technique viii TABLE OF CONTENTS LIST OF TABLES .

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A Comparison between different techniques for optimum design of steel frames subjected to blast

Cited by 7 publications

References 24 publications

Nonlinear Dynamic Analysis of Plates Subjected to Explosive Loads

Nonlinear Dynamic Analysis of Plates Subjected to Explosive Loads

Optimization of Framed Structures Subjected to Blast Loading Using Equivalent Static Loads Method

Damage-tolerant optimal design of structures subjected to blast loading

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