Prestressed concrete columns under bending and axial load

Author

Ajit Chiplunkar, New Jersey Institute of Technology

Document Type

Thesis

Date of Award

5-31-1990

Degree Name

Master of Science in Civil Engineering - (M.S.)

Department

Civil and Environmental Engineering

First Advisor

C.T. Thomas Hsu

Second Advisor

Dorairaja Raghu

Third Advisor

M. Ala Saadeghvaziri

Abstract

A general analysis and design equation for slender and nonslender prestressed concrete columns subjected to uniaxial or biaxial moments combined with axial load is proposed. The proposed equation is an extension to the one developed by Hsu for reinforced concrete columns. The analytical results of the ultimate loads of eccentrically loaded slender prestressed columns are compared with the experimental results reported by Brown and Hall and Aroni respectively. The comparative study shows that the proposed equation of interaction diagram is in good agreement with the actual tests.

The ultimate loads of biaxially loaded short columns are also compared with the analytical method suggested by Paul Zia and Subrata Dalal and by proposed equation of failure surface. The values of the ultimate loads obtained by the above methods are in good agreement when the eccentricity ratios (e_x/H & e_y/B, where e_x, e_y are eccentricities in x & y directions , H & B are depth & width of the cross section) are lower. For the higher eccentricity ratios, the lower values of the ultimate loads are obtained by the equation of the failure surface as proposed herein. The proposed equation of failure surface is again compared with a rigorous computer analysis method developed by Hsu. As predicted, the present proposed design equation achieves a slightly conservative value.

Recommended Citation

Chiplunkar, Ajit, "Prestressed concrete columns under bending and axial load" (1990). Theses. 2663.
https://digitalcommons.njit.edu/theses/2663