A Framework for 3D Finite Element Analysis of Lateral Pile System Response
Author: Ahmed Elgamal and Jinchi Lu | Size: 325 KB | Format:PDF | Quality:Unspecified | Publisher: ASCE | Year: 2009 | pages: 8
Linear and nonlinear three-dimensional (3D) finite-element (FE) simulations are becoming increasingly feasible on ubiquitous personal computers. Particularly suited to seismic applications, the open-source computational platform OpenSees provides such 3D simulation capabilities. With the aid of the graphical user interface OpenSeesPL for pile-ground analyses, routine 3D computations for this demanding situation are greatly facilitated. Through an analysis of an idealized pile- system embedded in clay, the reported investigations provide an overview of the involved numerical capabilities and user interface. To start, a single pile FE model is calibrated based on an available 3D linear analytical solution. The computed pile behavior for linear and nonlinear ground situations is then contrasted with that of the corresponding 3 x 3 pile group for two different pile-spacing scenarios. On this basis, assessments of lateral pile-group efficiency can be made. Further research and related practical applications are also discussed.
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The resolution of contact-impact problems, once computationally difficult, has been made easier and more accurate with the finite element method. This new book explains finite-element procedures for solving both static and dynamic contact-impact problems. It provides comprehensive discussions on the formulation, linearization, and discretization of such problems. Lagrangian formulation is introduced, and explicit and implicit solutions are presented. Friction phenomena and the behavior of shell structures upon impact are described. The book also includes numerical algorithms used to simulate industrial applications such as metal-forming processes and crashworthiness analysis of automobiles. Engineers, researchers, and students in solid and applied mechanics will require access to this valuable resource.
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Hello,
I was wondering does anyone knows some simple, easy to learn open source software that can be used to perform 3D FEA of geotechnical problems?
I would like to see some other opinions.
Best regards
freequo
This paper uses structural optimization techniques to cost-effectively design seismic steel moment frames with enhanced resistance to progressive collapse, which is triggered by the sudden removal of critical columns. The potential for progressive collapse is assessed using the alternate path method with each of the three analysis procedures (i.e., linear static, nonlinear static, and nonlinear dynamic), as provided in the United States Department of Defense United Facilities Criteria (UFC) Design of Buildings to Resist Progressive Collapse. As a numerical example, member sizes of a two-dimensional, nine-story, threebay regular steel immediate moment frame are optimally determined such that the total steel weight is minimized while the design satisfies both AISC seismic provisions and UFC progressive collapse requirements. Optimization results for the example frame reveal that the traditional minimum weight seismic design, which does not explicitly consider progressive collapse, fails to meet the UFC alternate path criteria associated with any analysis procedure. Progressive collapse design optimization using the linear static procedure produces the most conservative and consequently heaviest design against progressive collapse. In contrast, the more accurate nonlinear static and dynamic procedures lead to more economical designs with UFC-acceptable resistance to progressive collapse, at the expenses of considerable modeling and computing efforts.
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Optimum design of steel frames using a multiple-deme GA with improved reproduction operators
Author: D. Safari, Mahmoud R. Maheri, A. Maheri | Size: 1.8 MB | Format:PDF | Quality:Unspecified | Publisher: Elsevier | Year: 2011 | pages: 12 | ISBN: --
In this paper, the performance of the genetic algorithm is improved by introducing some new crossover and mutation operators. The new operators are incorporated into a multiple-deme genetic algorithm in which population is divided into subpopulations and communication between different demes is established through migration of individuals, enhancing diversity and resulting in better solutions. This algorithm is applied to the minimum weight design of steel frames subjected to actual strength and ductility constraints of AISC–ASD specifications as well as other serviceability and constructability constraints. The efficiency of the proposed method is demonstrated through optimising two benchmark problems including a three-bay, three-storey steel frame and a five-bay, 22-storey special steel frame. Significant improvements in the optimum solutions are obtained with reduced number of finite element analyses, resulting in less computational effort.
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The microtremor spectral ratio proposed by Nakamura (A method for dynamic characteristics estimation of subsurface using microtremor on ground surface. QR of RTRI, 1989, 30(1), 25–33.) developed a new interest on the use of microtremor measurements for the estimation of site effects. The Lisbon region is an earthquake-prone area and several descriptions of destructive earthquakes are reported in the historical data, which suggest the existence of site effects in the town of Lisbon. Several seismic hazard studies were already performed, as well as some microzonation studies based on records from blasts. In order to characterize the seismic behaviour of alluvium layers existing in the town, two sets of microtremor measurements were performed. The data were processed according to the Nakamura technique and the results are presented here. These results were correlated with the thickness of the alluvium deposits and compared with the spectral ratios obtained using records from blasts, as well as with 1D theoretical models and with 2D theoretical simulations obtained by the use of the Aki-Larner technique. These comparisons seem to prove that the use of microtremor measurements could give a good contribution for the microzonation techniques, specially in urban zones, due to the simplicity and rapidity of their acquisition.
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At the convention you will have the opportunity to participate in the development of industry codes and standards; network with many of the world’s leading concrete professionals; and learn about the latest in concrete technology while fulfilling your continuing education requirements.
The links are for the handouts (mostly pdf version of some presentations) that can help introduce the readers to most recent research trends and pressing issues on concrete.
PS: The link to the original site and presentation links do expire after a while.
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Article/eBook Full Name: Constitutive Modeling of Geomaterials: Advances and New Applications
Author(s): Qiang Yang, Jian-Min Zhang, Hong Zheng, Yangping Yao
Edition: 1
Publish Date: 2013
ISBN: 364232813X
Published By: Springer
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EN 1097-1:2011 Tests for mechanical and physical properties of aggregates - Part 1: Determination of the resistance to wear (micro-Deval)
Size: 0.12 MB
Format: PDF
Quality: Scanner
Publisher: CEN
Year: 2011
Pages: 14
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