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Re: Plane impact design[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Plane impact design
- From: Walter Sawruk <sawruk(--nospam--at)ix.netcom.com>
- Date: Thu, 08 Jul 1999 08:44:37 -0400
Rodrigo, Many technical papers have been published on aircraft impact effects on nuclear plant structures. One reference which contains an overview of this subject is: ASCE, STRUCTURAL ANALYSIS AND DESIGN OF NUCLEAR PLANT STRUCTURES, Manual No. 58, American Society of Civil Engineers, 1980. Some papers that might be of some help in estimating the impact forcing function: K. Drittler and P. Gruner, "Calculation of the Total Force Acting Upon a Rigid Wall by Projectiles", Nuclear Engineering and Design, Vol. 37 (1976), pp. 231-244. L. Y. Bahar and J. S. Rice, "Simplified Derivation of the Reaction-Time History in Aircraft Impact on a Nuclear Power Plant", Nuclear Engineering and Design, Vol. 49 (1978), pp. 263-268. There are several ways to approach the analysis problem, depending on what you are trying to achieve. If you are designing a new structure and the goal is to prevent gross structural collapse, without concern about local effects such as secondary missiles being generated (e.g., back face scabbing of R/C walls) and you have an estimate of the impact force versus time function available, then the methods in ASCE Manual 58 should be sufficient. However, if you are concerned about local effects on the target such as spalling and penetration and you need to consider deformation of the aircraft, then much more sophisticated analysis methods will be needed. Finite element analyses (LS-DYNA, DYNA 3D, ADINA and ABAQUS) can been used to predict nonlinear dynamic responses of the missile and target taking into account a host of special effects. However, the engineering effort involved with this approach is huge and the reliability of the results has a tendency to decreases as the sophistication increases. What I mean by a decrease in reliability is that the accuracy of very localized responses (e.g., the depth of missile penetration, velocities and trajectories of secondary missiles, ... etc.) is generally not as good as the accuracy of the predicted global responses, which can be achieved using much simpler methods. Hope this helps. Walt Sawruk EQE International, Inc. Shillington, PA email: ws(--nospam--at)eqe.com At 10:55 PM 07-07-1999 -0300, you wrote: > Does anyone know of a good source on the analysis of a structure to >airplane impact loads? Thanks in advance. Rodrigo Lema.
- Plane impact design
- From: Rodrigo Lema
- Plane impact design
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