NEHRP Clearinghouse

Refined Modelling of Reinforced Concrete Columns for Seismic Analysis.
Kaba, S. A.; Mahin, S. A.
National Science Foundation, Washington, DC., April 1984, 112 p.
Identifying Number(s)
The report extends the fiber representation of a section to make possible the analysis of reinforced concrete or steel members independently or as part of two-dimensional frames. Slice locations are specified along the length of the element. Each slice is further discretized into steel and/or concrete fibers. By monitoring the various fibers and slices, it is possible to obtain the local response at critical sections including moment-curvature and shear histories. Bond slip and shear effects are not considered so the multi-slice fiber element is suitable for modeling beams and columns in a steel or reinforced concrete frame especially when the effects of axial loads on strength and stiffness are significant. The element can account for axial load-bending moment interaction and the pinching of hysteresis loops due to compressive loads acting on the element. The functioning of the element is tested separately and as part of a general dynamic two-dimensional frame analysis program.
Earthquake resistant structures; Loads (Forces); Mechanical hysteresis; Reinforced concrete; Steels; Sheer stresses; Seismic effects; Structural members; Strength; Stiffness; Columns (Supports); Model tests; Axial stress; Framed structures; Bending