S. Rajasekaran et G. Sankarasubramanian, FAILURE CRITERIA FOR NONLINEAR-ANALYSIS OF CONCRETE STRUCTURES, INDIAN JOURNAL OF ENGINEERING AND MATERIALS SCIENCES, 3(5), 1996, pp. 175-179
Challenges in designing complex concrete structures such as tall build
ings, off shore oil platforms, nuclear containment structures have for
ced the structural analyst to acquire a sound knowledge of the behavio
ur of concrete. Many analytical studies of reinforced concrete structu
res or members have been carried out using finite element method due t
o the advent of digital computers and developments in constitutive mod
elling to simulate the complex behaviour of concrete. In order to perf
orm progressive failure analysis of a concrete structure and to trace
the overall load displacement response upto ultimate state, suitable c
onstitutive relationship including inelastic, failure criterion behavi
our is required. The failure criteria for concrete under combined stat
es of stress is defined in terms of yielding, initiation of cracking a
nd loading functions. This paper critically examines and summarises th
e salient features of the failure surfaces proposed by many investigat
ors and explains the methodology in developing a failure criterion for
the non-linear analysis. The proposed failure criterion is implemente
d in the special purpose code FENLACS(1) and the results are compared
with experimental results.