A robust predictive model for base shear of steel frame structures using a hybrid genetic programming and simulated annealing method

2011 ◽  
Vol 20 (8) ◽  
pp. 1321-1332 ◽  
Author(s):  
Pejman Aminian ◽  
Mohamad Reza Javid ◽  
Abazar Asghari ◽  
Amir Hossein Gandomi ◽  
Milad Arab Esmaeili
Keyword(s):  
Simulated Annealing ◽  
Genetic Programming ◽  
Predictive Model ◽  
Steel Frame ◽  
Frame Structures ◽  
Base Shear ◽  
Simulated Annealing Method ◽  
Steel Frame Structures ◽  
Annealing Method

scholarly journals Seismic retrofit of steel frame structures

2020 ◽  
Vol 15 (2) ◽  
pp. 106-117
Author(s):  
Magdy Ismail
Keyword(s):  
Seismic Hazard ◽  
Numerical Study ◽  
Steel Structures ◽  
Seismic Retrofit ◽  
Steel Frame ◽  
Frame Structures ◽  
Base Shear ◽  
Seismic Force ◽  
Moment Resisting ◽  
Steel Frame Structures

Abstract:Moment resisting frames are considered as an effective seismic force resisting system that is used for steel structures. Some of these structures that were built in high seismic hazard zones were designed according to old strength-based design codes. Currently, these structures do not meet the requirements of the new seismic codes. Therefore, the seismic retrofit of these structures is mandatory and cannot be overlooked. Steel braces and concrete-steel composite elements are common solutions for enhancing the seismic behavior of existing steel frame structures. This paper presents a numerical study that evaluates different possible techniques for the seismic retrofit of existing steel moment-resisting frame structures. The study investigates the performance of three multi-story buildings with different heights that are located in a high seismic hazard zone. Three retrofit techniques were introduced including; 1) X-Steel braces, 2) buckling restrained composite braces, and 3) composite concrete-steel plate shear walls. The seismic performance enhancement of the studied structures was evaluated in terms of the structure’s fundamental period, maximum inter-story drift and maximum base shear-to-weight ratios. Moreover, the cost of retrofitting material was estimated for each technique and they were compared to select the retrofit technique with the least constitutive material cost.

A new approach to determine the base shear of steel frame structures

2009 ◽  
Vol 65 (1) ◽  
pp. 188-195 ◽  
Author(s):  
Naci Caglar ◽  
Murat Pala ◽  
Muzaffer Elmas ◽  
Dilek Mercan Eryılmaz
Keyword(s):  
Steel Frame ◽  
Frame Structures ◽  
Base Shear ◽  
New Approach ◽  
Steel Frame Structures

A simulation study of self-assembly of ABC star terpolymers confined between two parallel surfaces

Soft Matter ◽  
2021 ◽  
Author(s):  
Zhiyao Liu ◽  
Zheng Wang ◽  
Yuhua Yin ◽  
Run Jiang ◽  
Baohui Li
Keyword(s):  
Simulated Annealing ◽  
Phase Behavior ◽  
Phase Diagrams ◽  
Simulation Study ◽  
Self Assembly ◽  
Simulated Annealing Method ◽  
Parallel Surfaces ◽  
Annealing Method

Phase behavior of ABC star terpolymers confined between two identical parallel surfaces is systematically studied with a simulated annealing method. Several phase diagrams are constructed for systems with different bulk...

Component Rearrangement on Printed Wiring Boards to Maximize the Fundamental Natural Frequency

1993 ◽  
Vol 115 (3) ◽  
pp. 312-321 ◽  
Author(s):  
Tien-Sheng Chang ◽  
E. B. Magrab
Keyword(s):  
Simulated Annealing ◽  
Boundary Conditions ◽  
Natural Frequency ◽  
Printed Wiring Board ◽  
Computationally Efficient ◽  
Additional Increase ◽  
Simulated Annealing Method ◽  
Fundamental Natural Frequency ◽  
Rearrangement Algorithm ◽  
Annealing Method

A methodology to attain the highest fundamental natural frequency of a printed wiring board by rearranging its components has been developed. A general two-dimensional rearrangement algorithm is developed by which the rearrangement of the component-lead-board (CLB) assemblies is performed automatically for any combination of equal size, unequal size, movable and immovable CLBs. This algorithm is also capable of incorporating two design restrictions: fixed (immovable) components and prohibited (non-swappable) areas. A highly computationally efficient objective function for the evaluation of the automatic rearrangement process is introduced, which is a linear function of the size of the individual CLBs that have been selected for each interchange. The simulated annealing method is adapted to solve the combinatorial rearrangement of the CLBs. Using 61 combinations of boundary conditions, equal and unequal sized CLBs, movable and immovable CLBs, various CLB groupings and sets of material properties, it is found that, when compared to the exact solution obtained by an exhaustive search method, the simulated annealing method obtained the highest fundamental natural frequency within 1 percent for 87 percent of the cases considered, within 0.5 percent for 72 percent of the cases and the true maximum in 43 percent of them. To further increase the fundamental natural frequency the introduction of a single interior point support is analyzed. Depending on the boundary conditions an additional increase in the maximum fundamental natural frequency of 44 to 198 percent can be obtained.

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