Investigating the effect of changes in column height and thickness of GFRP composite in flexural frame under near blast loading

In this research, buckling behavior and bearing capacity of GFRP composite columns have been investigated. Variable parameters in this study were column diameter, composite thickness and finally column height. Abaqus finite element software has been used for this purpose. The model is made for a composite bending frame with a height of ۳ meters and a span length of ۴ meters. The loading of the frame is assumed to be explosive and the frame connections are to be clamped. Based on the results of changes in the thickness of the composite and its effect on the buckling resistance of the column, it has been observed that with the increase in the thickness of the composite column from ۱۰ mm to ۱۶ mm, the value of the buckling resistance of the column had an upward trend. In the first mode, the buckling capacity of the column has increased from ۸۲.۹ tons to ۹۰.۳ tons, which shows an increase of ۸.۹%. On average, it can be said that with a ۶۰% increase in the thickness of the composite, the buckling capacity increased by ۸.۷%. Continued header, based on the results of changes in the height of the column and its effect on the buckling resistance of the column, it has been observed that with the increase of the height of the column from ۲.۵ meters to ۴.۵ meters, the value of the column buckling resistance had a downward trend. In the first mode, the buckling capacity of the column has increased from ۱۱۴.۳ tons to ۳۶.۱ tons, which shows a decrease of ۶۸%. On average, it can be said that the buckling capacity of the column has decreased by ۶۷% with the increase of almost two times the height of the column.

کلیدواژه ها:

GFRP column ، buckling ، geometrical characteristics ، Abaqus modeling