TOOL FOR SHEAR ANALYSIS OF PRESTRESSED STEEL FIBER CONCRETE BEAMS

Abstract eng:
Prestressed steel fiber concrete beams have been employed in bridge engineering because the conventional shear reinforcement can be replaced by steel fibers, which can reduce the construction labor and provide greater shear strength and ductility than those of conventional prestressed concrete beams. The shear strengths of elements in webs depend strongly on the softening of concrete struts in the principal compression direction due to the principal tension in the perpendicular direction. By studying the shear behavior of isolated web elements, this softening phenomenon has been clarified for monotonic loading in the Softened Membrane Model (SMM) for reinforced concrete. Recently, SMM was extended to prestressed steel fiber concrete. In the present paper, a Finite Element program (Called Simulation of Concrete Structures, SCS) is developed for analysis of shear-critical prestressed steel fiber concrete structures by implementing constitutive laws of prestressed steel fiber concrete into an object-oriented software framework called “Open System for Earthquake Engineering Simulation (OpenSees)” originally developed at the University of California, Berkeley. The new material modules have been integrated with the existing material modules in OpenSees. SCS thus developed has been used for predicting the shear behavior of the prestressed steel fiber concrete I-beams. The analysis could well predict the entire shear behavior of the beams including the initial stiffness, post-cracking stiffness, yield point, and ultimate load for both web shear and flexure shear failure modes. This new tool gives engineers greatly improved simulation capabilities.

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