Experimental and numerical study on truss string structure considering hysteretic performance asymmetry

Abstract

Aiming at the characteristics of the asymmetric hysteretic performance of truss string structure, and considering the plastic development of truss string structure. The experimental model of the truss string structure was established, and the experimental study was carried out under cyclic loading with vertical amplitude of 1:2 and 1:4. The difference in hysteretic behavior of truss string structure under different loading systems and the weak position of the structure under cyclic loading is obtained, and the results were compared with the previous study of cyclic loading test. The results show that with the increase of cyclic downward loading ratio, the downward energy consumption of the truss string structure increases gradually, and the failure mode changes from the buckling of the lower chords of mid-span to the buckling of the upper chords of mid-span, which eventually leads to the overall instability of the structure. The weak positions of the truss string structure are distributed in the upper and lower chord members of the truss string structure in mid-span.