A major problem engineers face in the analysis of excavation by the classical methods is the difficulty of predicting displacements around the support structure. To solve this problem, finite element method (FEM) is increasingly employed. However, so many engineers in the field have little knowledge of FEM that hampered the method to spread in practice.
In this paper authors attempt to provide a useful tool for field engineer, who know little of FEM, to design the structure by both classical pressure diagram and FEM methods at same time. At first, calculate depth of pile and anchor force by each of classical methods, including free earth support, fixed earth support, a modified and an improved fixed earth support, and then compute the displacements by FEM method for each situation respectively. For FEM method, an elasto-plastic theory and a Mohr-Coulomb constitutive law are adopted for soils and the mesh is automatically formed. After comparison, a safer and more economical design can be selected. To support this method, a computer package on Windows 95 base has been developed by the authors. Results of a practical example show that the improvement of fixed earth support method is better for the design.
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The AutoCAD 2013 has an opening image that was used from a real project: - The New Football Stadium "Mane Garrincha", in the beautiful city of Brasilia (capital of Brazil).
In the file we have a series of photos showing the construction of the same stage, at the beginning of the month of Setembro/2012
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Journal of Water Resources Development - Requested papers
Water Management in Dhaka
Author: Azharul Haq, Khondaker | Size: 0.51 MB | Format:PDF | Quality:Original preprint | Publisher: Water Resources Development Vol. 22 (2) | Year: June 2006 | pages: 291–311.
Water Sector of Bangladesh in the Context of Integrated Water Resources Management: A Review
Author: Das Gupta, Ashim; Babel, Mukund Singh; Albert, Xavier; Mark, Ole | Size: 0.57 MB | Format:PDF | Quality:Original preprint | Publisher: Water Resources Development Vol. 21 (2) | Year: June 2005 | pages: 385–398
Urban Water Management Problems in Developing Countries with Particular Reference to Bangladesh
Author: Khan, Hamidur Rahman; Siddique, Quamrul Islam | Size: 0.79 MB | Format:PDF | Quality:Original preprint | Publisher: Water Resources Development Vol. 16 (1) | Year: 2000 | pages: 21–33
All 3 papers inside.
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This is the first book in a three-volume series deploying MATLAB-based applications in almost every branch of science. This volume, presents interesting topics from different areas of engineering, signal and image processing based on the MATLAB environment.
This collection of high quality articles, refers to a large range of professional fields and may be used for scientific, engineering and educational purposes.
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Authors & Paper Name: Azharul Haq, Khondaker (June 2006). "Water Management in Dhaka". Water Resources Development 22 (2): 291–311.
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Authors & Paper Name: Das Gupta, Ashim; Babel, Mukund Singh; Albert, Xavier; Mark, Ole (June 2005). "Water Sector of Bangladesh in the Context of Integrated Water Resources Management: A Review". Water Resources Development 21 (2): 385–398.
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Authors & Paper Name: Khan, Hamidur Rahman; Siddique, Quamrul Islam (2000). "Urban Water Management Problems in Developing Countries with Particular Reference to Bangladesh". Water Resources Development 16 (1): 21–33.
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Good Practices in Urban Water Management: Decoding Good Practices for a Successful Future
Author: ed. by Anand Chiplunkar, Kallidaikurichi Seetharam, Cheon Kheong Tan | Size: 5 MB | Format:PDF | Quality:Original preprint | Publisher: ADB, National University of Singapore | Year: 2012 | pages: 228 | ISBN: 9789290927419
This report presents case studies on successful Asian water utilities. The case studies provide objective, accurate, and critical analyses of urban water management practices in eight Asian cities over a 10-year period.
Other local leaders throughout the developing world can use these cases to help craft their own solutions, taking into account specific local circumstances. What is most important for cities is to find some common base elements for success and then replicate these, albeit with appropriate modifications, to suit their own special conditions.
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A mechanistic study explaining the synergistic viscosity increase obtained from polyethylene oxide (PEO) and β-naphthalene sulfonate (BNS) in shotcrete
Author: J. Pickelmann, J. Plank | Size: 1.2 MB | Format:PDF | Quality:Original preprint | Publisher: Cement and Concrete Research Vol 42, Iss 11 | Year: November 2012 | pages: 1409–1416 | ISSN: 0008-8846
In shotcrete, a combination of polyethylene oxide (PEO) and β-naphthalene sulfonate (BNS) is commonly applied to reduce rebound. Here, the mechanism for the synergistic viscosity increase resulting from this admixture combination was investigated via x-ray diffraction (XRD), infrared and nuclear magnetic resonance (NMR) spectroscopy. It was found that the electron-rich aromatic rings present in BNS donate electrons to the alkyl protons of PEO and thus increase the electron density there. This rare interaction is known as CH–π interaction and leads to the formation of a supramolecular structure whereby PEO chains bind weakly to BNS molecules. Through this mechanism a polymer network exhibiting exceptionally high molecular weight and thus viscosity is formed. Among polycondensates, sulfanilic acid–phenol–formaldehyde (SPF) provides even higher synergy with PEO than BNS while melamine (PMS), acetone (AFS) or polycarboxylate (PCE) based superplasticizers do not work at all. Effectiveness of lignosulfonates is dependent on their degree of sulfonation.
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Mix proportion of eco-friendly fireproof high-strength concrete
Author: Se Jin Choi, Soo-Hwan Kim, Su-Jin Lee, Rosa Won, Jong-Pil Won | Size: 0.94 MB | Format:PDF | Quality:Original preprint | Publisher: Construction and Building Materials, Vol 38 | Year: January 2013 | pages: 181–187 | ISSN: 0950-0618
The optimum mix proportion for eco-friendly fireproof high-strength concrete was derived in this study. The mixture of the concrete was evaluated by thermal performance through a fire-resistance test. To derive the optimum mix proportion, ground granulated blast-furnace slag and porcelain were substituted, and a 0.1 vol.% fraction of polypropylene fibre was added to prevent spalling. Porcelain was used, as it is effective in improving residual strength. The RABT curve was adopted as the heating time–temperature curve for the fire-resistance test. The derived optimum mix proportion can contribute to ecological friendliness, as it produced up to 34.6% CO2 savings compared with the mixture using conventional cement. Furthermore, improvement in the characteristics of concrete was shown after exposing this mixture to high temperature following the addition of porcelain.
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Deterioration Mechanism of Cementitious Materials Under Acid Rain Attack
Author: Meng-Cheng Chenn, Kai Wang, Li Xie | Size: 2.38 MB | Format:PDF | Quality:Original preprint | Publisher: Engineering Failure Analysis | Year: September 2012
Cementitious material specimens were immersed in a simulated acid rain solution for different time periods to allow deterioration to occur and then the specimen strengths were measured and the mineralogical compositions and microstructures were analyzed using X-ray diffraction (XRD), Fourier Transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) diffraction.
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