Evaluation of the limit live loading of existing reinforced concrete columns using AS 3600 provisions

The process of design of new building elements for known loads is better understood than analysing existing structures for their limit loads using the provisions in the codes of practice. This paper describes a method for the evaluation of the limit loads for existing reinforced concrete (RC) frames using the current AS 3600 provisions. The method particularly focuses on the columns although a specific case of the method covers beams. The method is based on an iterative process for the evaluation of limit live load for RCframes, which conforms to the level of safety implied in AS 3600. Although the method could be applied for RC frames with short and slender columns, examples are provided for slender columns only as they are relatively more complex.