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_aMania, Efren D.
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_aElastoplastic analysis of reinforced concrete frames /
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_cEfren D. Mania.
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_axii, 133 pages
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_aThesis (M.A.) -- Pamantasan ng Lungsod ng Maynila, 2006.;A directed study presented to the faculty of Graduate School of Engineering in partial fulfillment of the requirements for the degree Master of Engineering (MEng) with specialization in Structural Engineering.
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_aABSTRACT: Plasticity is concerned with the behavior of structures beyond the elastic limit. The standard approach was to calculate the maximum stress elasticity but this approach is often wasteful. A realistic approach is to calculate the collapse load and make sure it would not be exceeded by the factored loads. This study investigated the effects of inelastic behavior of a two-storey concrete moment resisting frame using elastoplastic analysis by producing an analysis tool for predicting failure modes of a building and detailed calculation in finding the limit load factor before collapse. This study will be helpful to the structural engineering profession by identifying the failure modes of a building and realistic appraisal of the actual load-carrying capacity of a structure, thus leading to improved economy allowing the designer to modify, within limits, the moment diagrams for which members are to be designed. This will also shed light to the civil engineering students an understanding of performance based design of structures. Elastoplastic is a series of elastic analyses where the load is increased until a plastic hinge occurs producing a new structure. This procedure goes on and on with monotonically increasing loads as more plastic hinges occur until such a time that the structure can no longer sustain any load increase. The moment of all columns are checked at every stage if it is within the interaction curve using PCACol and STAAD. A spreadsheet was developed to simplify the tedious and repetitive task of computing and selecting values. The spreadsheet compares the limit and actual moments then computes load factors for each member. The smallest load factor will determine the predicted first plastic hinging or collapse. Future moments are then computed based on this predicted load factor. With the conclusion that failure modes can be predicted with a significant increase in load factor from elastic to elastoplastic analysis, it is recommended that pushover analysis in two directions, application in retrofitting of buildings be studied. With the inclusion of pushover analysis into the seismic design in the United States, Japan and Europe, the need for pushover analysis tools for structural design in seismic zones here in the Philippines is apparent. It was shown that the elastoplastic or pushover analysis allows the designer to advance to the state of the art from current code design by giving them more design options and allowing them to choose a desired building performance after a given seismic event.
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