Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Design Procedures For Shock Isolation Systems Of Underground Protective Structures Volume I Structure Interior Motions Due To Air Blast Induced Ground Shock PDF full book. Access full book title Design Procedures For Shock Isolation Systems Of Underground Protective Structures Volume I Structure Interior Motions Due To Air Blast Induced Ground Shock.
| Author | : T. Morrison |
| Publisher | : |
| Total Pages | : 164 |
| Release | : 1964 |
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| Total Pages | : 239 |
| Release | : 1964 |
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The primary purpose of this report is to provide guidance for designers of shock isolation systems during the initial phases of design. Volume I presents methods for estimating appropriate free field waveforms and the influence of soil-structure interaction upon interior structure motion. The inherent error in shock isolation design is at least =20%; to reduce this, much more soil test data than is now available will be required. Further, based on purely theoretical arguments, shock isolation per se can be eliminated for much equipment used in hard installations. If isolators are required they should be designed as low frequency systems that impose one g acceleration on the isolated equipment. Increase of the acceleration to be tolerated by the equipment will, in the great majority of instances, reduce neither the rattle space required nor the isolator cost. Methods for making the necessary computations are given.
| Author | : F. Finlayson |
| Publisher | : |
| Total Pages | : 211 |
| Release | : 1965 |
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This volume presents a method for estimating the motions on the interior of a buried cylindrical shell resulting from directly-induced ground shock caused by the detonation of a nuclear device to aid in the preliminary design of shock isolation equipment. Various theoretical models for calculating the free-field waveform are reviewed and the acoustic model is recommended for this purpose. The reasons for this recommendation are enumerated and the methods for applying it are given. Methods for solving the structure-medium- interaction problem are discussed and the normal-mode analysis of the response of an elastic cylindrical shell in an acoustic medium to a specified input pulse is reviewed in detail. A discussion of ranges of parameters appropriate to realistic problems is included. A thorough explanation of the results of computer solutions for the shell response is presented, and a large number of graphs illustrating the results are included. The results are analyzed to determine the relative influence of the parameters on interior shell motion. The application of the method developed is explained and illustrated by sample problems. An appendix contains a Duhamel-integral computer program that can be used to generate results for cases not included in this volume.
| Author | : F. Finlayson |
| Publisher | : |
| Total Pages | : 203 |
| Release | : 1965 |
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| Total Pages | : 1336 |
| Release | : 1966 |
| Genre | : Government publications |
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| Author | : N. M. NEWMARK |
| Publisher | : |
| Total Pages | : 79 |
| Release | : 1966 |
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The supplement (to AD-627 516) contains a description of the computer program developed to study the dynamic response of multi-degree-of-freedom systems subjected to earthquake or blast-type ground motions. A description of the features and a derivation of the equations solved by the computer program are presented. The data input to the computer is defined by using a control card containing or preceding each type of input information. The purpose of each control card and the data is given with an example of some typical problems solved using the program. The final section contains the flow diagrams of the main program and each subroutine. (Author).
| Author | : |
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| Total Pages | : 700 |
| Release | : 1966 |
| Genre | : Science |
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| Total Pages | : 0 |
| Release | : 1962 |
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This report reviews the major considerations relating to the design of Shock Isolation Systems for use in underground protective structures, emphasizing in particular those areas where special guidance is needed by the facility engineer. The motion of the ground due to nuclear blast, the interaction of the ground motion with buried structures, and the tolerances of typical facility equipment to shock are described and employed to establish the input and output requirements for isolation systems. Analytical methods for determining the dynamic responses of both linear and nonlinear isolation systems are summarized and, for several of the more commonly used configurations, the equations are reduced to simple form. The report suggests the use of the shock response spectrum in a unified approach to the specification of attenuation requirements, equipment shock tolerances and shock test machine selection.
| Author | : N. M. Newmark |
| Publisher | : |
| Total Pages | : 206 |
| Release | : 1965 |
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The purpose of this study is to develop simple rules for the designer so that he may be able to predict the maximum responses of two-degree-of-freedom elastic and inelastic systems under various types of ground shock excitation. The true responses of two-degree-of-freedom systems both in the elastic range and in the inelastic range, when subjected to five different forms of ground excitation are compared with the modal response of the same systems. Simple expressions are given for linear two-degree-of-freedom mass and spring combinations from which modal parameters can be obtained. From these modal parameters, and the response spectra for one-degree-of-freedom systems for various excitations, as presented in Vol. III (AD-444 989) of this series of reports, one can determine bounds and probable values of the response. A detailed study is reported of a two-degree-of-freedom system subjected to a step velocity pulse at the base, having various combinations of elastic and inelastic response. In addition, a series of solutions of two-degree-of-freedom systems are presented for comparison with various approximate rules for determining bounds to the response in the various springs of the system. (Author).
| Author | : N. M. Newmark |
| Publisher | : |
| Total Pages | : 126 |
| Release | : 1965 |
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A discussion is presented of maximum response for multi-degree-of-freedom elastic systems considering five-degree-of-freedom systems in some detail, with some results for ten-degree-of-freedom systems and other systems for which data are available in the literature. Included are tabulations of response data computed from step by step integration of the equations of motion for five different forms of ground excitation on a number of systems having varying parameters of mass and stiffness distribution. The results are compared with the modal responses for the same systems, and general rules are developed for comparing the true responses with various combinations of the modal response data. Consideration is given to treatment of a multi-degree-offreedom system as a continuous shear beam, and some generalizations are drawn from the study which enable a better interpretation of the results of the specific data tabulated in the report. Some suggestions arising from the studies reported in Vol. IV are made to take into account the behavior of multi-degree-of-freedom systems in the inelastic range. (Author).
