STRUCTURAL BEHAVIOR OF RING SECTIONS UNDER NONUNIFORM EXTERNAL PRESSURE.
Abstract
The purpose of this research was to develop methods of analysis and structural design for ring sections under a prescribed nonuniform external pressure distribution. This pressure distribution corresponds to that which is assumed to act normal to an isolated tunnel or silo liner. The ring sections were constructed of either materials which exhibit an isotropic, homogeneous elastic-perfectly plastic stress-strain relation or of reinforced concrete. The 'exact' two-dimensional elasticity equilibrium solution in polar coordinates was obtained as a basis for predicting incipient material yielding, and also in establishing the equilibrium displacement vector required in the elastic stability solution. Using these results, a criterion for predicting the primary mode of failure (i.e., buckling or gradual yielding and eventual collapse) was obtained. The method of limit analysis was then applied to determine the collapse load. Post-elastic deformation relations for ring sections subject to this particular mode of failure were derived based upon approximate plasticity methods. A nomograph was derived to determine the required reinforced concrete section properties (i.e., thickness and reinforcing steel). Shear and diagonal tension design relations also were obtained.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1966
- Accession Number
- AD0482048
Entities
People
- M. D. Reifel
- R. T. Haelsig
- Richard H. Anderson