Evaluation of Ayrton–Perry formula to predict the compressive strength of batten columns

This research was performed to evaluate two analytical methods for predicting the compressive strength of batten columns. Batten columns were subjected to pure axial compression, and the compressive strength was measured. The analytical methods used included the well-known Ayrton–Perry and ultimate strength curve methods to calculate the compressive strength of imperfect solid web columns, but their validity has not yet been studied experimentally on built-up columns. The geometrical parameters considered included the batten plate spacing and dimensions and the distance between the two longitudinal chords. The results show that the analytical methods were generally valid for the prediction of the compressive strength in batten columns and solid web columns. Using the average results of the Ayrton–Perry and ultimate strength curve methods leads to the best prediction of the column compressive strength. It was also shown that the initial imperfections in the batten columns could have a more important effect than the geometrical specifications on the value of compressive strength.

► Experimental test to evaluate the compressive strength of batten columns.
► Comparison of the experimental results with Ayrton-Perry analytical method.
► Using Southwell plot to measure the imperfections.
► The Ayrton-Perry method was in good agreement with the test results.