Failure Analysis of RC Shell Structures Using Volume Control Method

摘要

By introducing a pressure node which has an increment of pressure as an additional degree of freedom of a shell finite element, the so-called volume control method was developed by utilizing the pressure node added into the finite shell element to overcome the drawbacks of conventional load control method and displacement control method. In this study, a so-called path-dependant volume control method which improves the volume control method for the analysis of path-dependant behaviors of RC shell structures subjected to cyclic loading is proposed. The path-dependant volume control method is a technique which calculates control-volume change of the RC structure depending on the cyclic loading conditions like loading, unloading, and reloading and overcomes the limitation of controlling the volume change of the RC structure according to the loading history. For the finite element failure analysis of RC shell structures, each structure is discretized with multi-layered shell elements and in-plane two dimensional constitutive equations for concrete and reinforcements are implemented for each layer of the shell elements. The results of the analysis for RC slab, RC tank, and RC box culvert subjected to cyclic load using the path-dependant volume control method are verified with experimental results (See Fig.1 and Fig.2).