Finite Element Analysis of the Seismic Behavior of Guyed Masts
Author: Gregory Martin Hensley | Size: 0.68 MB | Format:PDF | Quality:Unspecified | Publisher: Blacksburg, Virginia | Year: june 2005 | pages: 130
Seismic design of guyed masts, commonly used in the broadcasting and telecommunications industries, has not been fully addressed in the United States. There is no specific design code, and only a limited amount of research has been reported on the subject. This research investigates the behavior of guyed masts incorporating synthetic ropes as guys, with a particular focus on the effect of snap loads on the mast behavior.
This is the third phase of a multi-stage project aimed at analyzing the potential for Snapping-Cable Energy Dissipators (SCEDs) to minimize lateral response in structures. A finite element model of a 120-m-tall guyed mast was developed with the commercial program ABAQUS. The three-dimensional behavior of the mast was observed when subjected to two ground motion records: Northridge and El Centro. Three orthogonal earthquake components were input, two horizontal and one vertical. A series of parametric studies was conducted to determine the sensitivity of the response to guy pretension, which is a measure of the potential slackness in the guys during response.
Additionally, the studies examined the effects of guy stiffness, mast properties, and directionality of input motion. Deflections, bending moments, guy tensions, and base shears were examined. The results were used to characterize the trends in the structural response of guyed masts. The level of slackness in the guys changed the behavior, and the lessons learned will be used to continue research on the application of SCEDs in structures.
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Non-Linear Seismic Response of Base-Isolated Frame Structures Using Rubber Bearings
Author: Anis S. Shatnawi , Abdelqader S. Najmv) , Mu’tasim S. Abdel-Jaberv) and Iyad M. Amareen | Size: 0.6 MB | Format:PDF | Quality:Unspecified | Publisher: Jordan Journal of Civil Engineering, Volume 2, No. 2, 2008 | Year: 2008 | pages: 20
Over the past two decades, much progress has been made in research and application of the base isolation of structures as means of providing earthquake resistance to a structure. However, the trade-off between the extent of acceleration reduction and the response of a base-isolation system has not been given a serious consideration.
This work uses a new material constitutive model for rubber bearing base-isolation system, which adopts the technique of real-time structural parameter modification. To achieve this, a finite element modeling and analysis are performed as a comparative study between a conventional totally fixed-base steel frame structure and similar base-isolated structures using rubber-steel bearings. The structures are subjected to the El-Centro, N-S earthquake.
In order to include nonlinearity effects, a non-linear hyperviscoelastic material model has been used and linked to ABAQUS software as a user defined material subroutine (i.e., UMAT). Special connector elements are selected from ABAQUS library to connect the rubber bearings to the frame structure and the foundations in order to achieve the required kinematical constraints at the connection points. The model is validated by carrying out a comparative study of the results obtained from the analysis of the presented material model with those obtained by using the existing ABAQUS material models (e.g., Ogden material model). The results show a significance efficiency of using the rubber bearing isolation in order to uncouple the structure from the seismic ground motion. Moreover, it has been proved that the used material model is more effective to capture the behavior of the base-isolated structures expressing a notable reduction in acceleration and an increase in the structural resistance to earthquake excitations.
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The application of ABAQUS in seismic analysis of connected structures
Author: Jiachun Cui, Chengming Li, Wei Tian, Dongya An Technical Center of Shanghai Xian Dai Architectural Design (Group) Co.,Ltd. | Size: 02 MB | Format:PDF | Quality:Unspecified | Publisher: 2010 SIMULIA Customer Conference | Year: 2010 | pages: 15
The connected structure refers to the kind of building which is composed of two or more towers connected by the connecting body in a certain height, belonging to the irregular building structure system. According to “Technical Specification for Concrete Structures of Tall Building” (JGJ3-2002), the time-history analysis method should be adopted in the seismic analysis of the connected structure. The structure may have a larger plastic deformation under rare earthquake, so it is difficult to converge when the implicit solution method is used by the conventional finite element software. While the explicit integral technology provided by ABAQUS can solve the nonlinear dynamics problems better, it has a broader application in elastic-plastic dynamic analysis. Taking a specific project as an object, the application of ABAQUS in seismic analysis of connected structures is presented in detail in this paper.
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Slender structures, such as towers, masis, high-rise buildings and bridges, are especially prone to wind excited vibrations. The lectures show how the susceptibility of a structure to wind excited vibrations can be assessed in early stages of design and what measures are effective for control or avoidance of vibrations. The book will be a help for all dealing with dynamic response of structures.
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ACI 305.1-14 Specifications for Hot Weather Concreting
Size: 1 MB | Format:PDF | Quality:Original preprint | Publisher: American Concrete Institute | Year: 2014 | pages: 11
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Article/eBook Full Name: Solution Manual of Numerical Methods in Engineering with MATLAB
Author(s): Jaan Kiusalaas
Publish Date: 2009
Published By: cambridge
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Small Dams: Planning, Construction and Maintenance has been written to provide a practical approach and guide to determining catchment yield and the amount of water required in a dam, advising on selecting and working with engineers and contractors, as well as outlining the cause of dam failures and how to remedy problems quickly. It also covers relevant legislation, environmental and ecological issues.
Employing the principles in this book, in conjunction with heeding the advice of suitably experienced and qualified engineers and contractors, will reduce the risk of failure and help to ensure the long term success of any small dam in question. Small Dams will be an invaluable resource for anyone who owns a dam, and a useful reference for agencies, contractors and engineers.
The author, Barry Lewis, has over forty years of experience as an engineer and has written extensively on farm dams, soil conservation, catchment management and the environmental impact of dams both on and off streams. He was also directly involved in the licensing and regulating of small dams in Australia.
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