Prestressing has become one of the most important reinforcement methods for concrete elements. However the research for analyzing the sectional behavior of a prestressed concrete element has not been thorough yet. Three dimensional finite element method could be one of the means to understand the behavior, but computational cost is too high. Therefore, simple lumped plasticity modeling is necessary for analyzing a multi-story building system with prestressed elements and performing its displacement-based seismic design. In this study, a computer program with new analytic models is developed focusing on the generation of moment-curvature relation and axial force-moment (P-M) interaction that may be used for the performance-based design. A new analytic model regarding the relation between tendon stress increase and element load/moment is established from the collated previous experimental results. The program is well-designed for users to calculate the moment-curvature relations and P-M interactions of various reinforced and prestressed concrete sections, including unbonded prestressed element sections. The generated data from the program when it comes to normal reinforced concrete elements and bonded prestressed concrete elements are reasonable and accurate, comparing with the previously verified program and other projects. On the other hand, the sectional analysis of unbonded prestressed elements is unprecedented. Through the case study with various analysis options, it is shown that linear and exponential tendon stress increase models can be recommended. This study focuses on the convergence research of computer programming and structural engineering through development of the sectional analysis program supporting most cases of structural elements.
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Development of Sectional Analysis Platform for Reinforced and Prestressed Concrete Elements
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