iosr-JMCE   Volume-16 ~ Issue-1 ~ Jan-Feb 2019

Abstract: Many liquid storage tanks around the world have affected by earthquakes. Seismic analysis of such tanks is much complicated due the Fluid-Structure Interaction (FSI). Furthermore, when the soil properties are taken into consideration, the analysis with the Fluid-Soil-Structure Interaction (FSSI) becomes very complicated and tedious. In this paper, a 3-D Finite Element (FE) model for a shallow rectangular rested on soil Reinforced Concrete (RC) tank is constructed using the FE software; ANSYS. Furthermore, a nonlinear dynamic time history analysis is carried out to investigate the behavior of this type of tanks during earthquake considering the FSSI. The vertical and the horizontal components of three ground motion records are used in the study with different frequency contents. Moreover, two different soil types are considered. The effects of the FSSI and the ground motions on the straining actions............

Keywords -Rectangular Tanks, Seismic, Fluid-Soil-Structure Interaction, Frequency Content, Time History Analysis

[1]. ACI 350 (2001), Seismic Design of Liquid-Containing Concrete Structures (ACI 350.3-01) and Commentary (350.3R-01), ACI. USA.
[2]. American Society of Civil Engineers (ASCE), 2005. Minimum Design Loads for Buildings and Other Structures, ASCE 7, ASCE Standard, SEI/ASCE 7-02, Reston, VA.
[3]. ANSYS. V. 14.5. (2012) Swanson analysis systems Inc. Houston (Pennsylvania, USA).
[4]. Avval, I. T. (2012). "Dynamic response of concrete rectangular liquid tanks in three-dimensional space." Theses and dissertations.
[5]. Bang-Fuh, C., Shih-ming, H. (2015). "A numerical study of liquid tank and structure interaction." Journal of Marine Science and Technology 23(5): 781-791...

Abstract: Several studies were already carried out on the efficient use of energy in the past but little was done so far on the comparative study of energy and exergy for some manufacturing processes.To this effect, in this study, the compilation and analysis of data collected from a cement manufacturing plant in the North-Central region of Nigeriafor a period spanned from 2010 to 2014were conducted in order to study the variations of energetic and exergetic efficiencies in each unit of theproduction line of the plant. Consequently, the study revealedthat the overall energetic and exergetic..........

Keywords: Energy, energetic efficiency, exergetic efficiency, exergy analysis.

[1]. T.W. Choate, Energy and emission reduction opportunities for the cement industry (Industrial Technologies Programme, U.S Department of Energy, Energy Efficiency and Renewable Energy, 2003)
[2]. D. Ibrahim and M. A. Rosen Exergy, Energy, Environment and Sustainable Development, 2007)
[3]. .A. Rosen Comparison based on Energy and exergy analyses of the potential cogeneration efficiencies for fuel cells and other electricity generation devices, International Journal of Hydrogen Energy vol15 no 4 pp 267, 2015)
[4]. Duda W.H, Cement data-book (International Process Engineering in the cement industry 2ndEdition, 1997)
[5]. Canadian Lime Institute, Energy efficiency opportunity in the lime industry (Office of Energy Efficiency, Natural Resources Canada, Ottawa, ON 2001)

Abstract: In this study, conical ground and elevated tanks` seismic response has been investigated. This study has been motivated with the deficiency of data in design codes concerning conical tanks seismic analysis. Seismic analysis by American Water Works Association for welded steel tanks for water storage (AWWA D-100) or Egyptian code for loads (ECP201-2012) is based on an approximate method by using the mechanical analog of cylinder tanks by substituting the conical tank with an equivalent cylinder tank. 3D Finite element models have been modeled using added mass approach in order to represent the fluid-structure interaction. A previously established mechanical analog...........

Keywords: added mass approach;conical tanks; fluid-structure interaction; seismic analysis; seismic response

[1]. Maheri MR, Severn RT. Hydrodynamic consideration for seismic design of cylindrical structures.Proc of the Conf on Civil Engngr Dyna, Organised by the University of Bristol and SECED, Univer-sity of Bristol, 24–25 March, 1988:297–313.
[2]. Egyptian Committee for making Egyptian Code for estimating loads and forces in structural and construction works.Code number 201. Egyptian Code for estimating loads and forces in structural and construction works (2012).
[3]. LĠVAOĞLU, Ramazan & Doğangün, Adem. (2004). A simple seismic analysis procedure for fluid-elevated tank-foundation/soil systems,.
[4]. AmericanWaterWorksAssociation(AWWA).2005.Welded steel tanks for water storage, AWWA D-100. Denver, Colo. El Damatty, Ashraf & Sweedan, Amr. (2006). Equivalent mechanical analog for dynamic analysis of pure conical tanks. Thin-walled Structures - THIN WALL STRUCT. 44. 429-440. 10.1016/j.tws.2006.03.016.
[5]. LĠVAOĞLU, Ramazan & Doğangün, Adem. (2006). Simplified seismic analysis procedures for elevated tanks considering fluid–structure–soil interaction. Journal of Fluids and Structures. 22. 421–439. 10.1016/j.jfluidstructs.2005.12.004.

Abstract: This work presents a case study for a fixed offshore platform to show the value of applying friction damper in increasing the lateral resistance under wind, waves and currents. It is considered an extendable work for previous published research which investigated the ability of the rotating friction damper by an experimental test and consequently simulated this damper with a suitable mathematical method through finite element software. Then get good benefit for equipping the friction damper to fixed offshore platforms. Here, a prototype for fixed platform shall be presented and analyzed under environmental loads with and without applying friction damper to the platform, then comparable results were discussed..

Key Words:-dynamic, environmental loads, friction damper, offshore platform, rehabilitation

[1]. Cheng, F.Y. et al., Smart structure: Innovative systems for seismic response control, Taylor and Francis Group, USA, 2008.
[2]. Applied Technology Council (ATC), Proceedings of ATC-17-1 Seminar on Seismic Isolation: Passive Energy Dissipation and Active Control, San Francisco, California, 1993.
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[5]. Chu, S.Y., Soong, T.T., and Reinhorn, A.M., Active, Hybrid, and Semi-Active Structural Control: A Design and Implementation Handbook, John Wiley & Sons, Chichester, England, 2005..

Abstract: The effect of mineral admixtures on behavior of reinforced Concrete against attack chloride salt was investigated experimentally. The program of the study consisted of casting, curing and testing of three mixes. Mix one contains ordinary Portland cement. Mix two contains ordinary Portland cement and 10% fly ash. Mix three contains ordinary Portland cement and 10% silica fume. For every mix cubes (100*100*100 mm) and cylinders (100*200 mm) without and with 16 mm steel reinforcement were molded. Samples were exposed to sodium chloride solutions (NaCl) with concentration of 0%, 5%, 7%, and 9% until time periods 28, 60 and 90 days. The mechanical properties concrete compressive strength, splitting tensile and rate of steel corrosion were measured. The results show........

Key Words:-sodium chloride; mineral admixtures; steel corrosion; strength; resistance. About five.

[1] Ahlstrom, J, Tidblad, J, Sederholm, B, and Wadso, L, "Influence of chloride and moisture content on steel rebar corrosion in concrete", Materials and Corrosion 2016
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[3] J. Mietz, Electrochemical Rehabilitation Methods for Reinforced Concrete Structures. A State of the Art Report, European Federation of Corrosion by the Institute of Materials, 1998 (Book No 709).
[4] C. Andrade, M. Castellote, C. Alonso, in: D.W.S. Ho, I. Godson, F. Collins (Eds.), An overview of electrochemical realkalisation and chloride extraction, Proceedings of Second Int. RILEM/CSIRO/ACRA Conference on Rehabilitation of Structures, Melbourne, Australia, 1998, pp. 1–12.
[5] P. Pedeferri, L. Bertolini, La durabilità del calcestruzzo armato, McGraw-Hill, Milano, 2000 (ISBN 88 386 0845-8)...