Adaptation of SAP IV Computer Code to Aircraft Shelter Analysis Program
Final rept. Nov 1975-Jun 1976
NEW MEXICO UNIV ALBUQUERQUE ERIC H WANG CIVIL ENGINEERING RESEARCH FACILITY
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This report is concerned with the adaptation of a linear, static and dynamic structural analysis computer code SAP IV to aircraft shelter structural components. A number of features were added to the documented version of SAP IV to decrease the time and effort necessary to set up practical problems. The Free Format Input Program enables the user to input data without the confusing and restrictive format rules of the original version. To aid in finding errors in element layout, a versatile mesh plot package has been included. A stressdisplacement versus time plot capability now enables the user to generate report quality output time histories. A specific procedure for approximating the nonlinear behavior of cracked concrete has been developed and is included in this report. Although SAP IV is designed to treat a large number of different types of elements, this study was directed specifically at three element types thin shell or plate, thick shell or plate, and beam. These elements were considered as most applicable to the aircraft shelter problem. The FFIP and mesh plotting routines are applicable only to these three elements, while the time-history plotting capability will function with all the elements presently in SAP IV.
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