Essential stressing state features of spirally reinforced concrete short columns revealed by modeling experimental strain data
Bai Liu, Yu Zhang, Rui Li, Guangchun Zhou, Yan Zhao
Abstract
This study discovers the essential stressing state features of spirally reinforced concrete (SRC) short columns from the modeling of the experimental strain data. The structural stressing state method models the measured strains into generalized strain energy density (GSED) values to describe the stressing state mode and the corresponding characteristic parameter. Then, the Mann-Kendall criterion detects the leap feature of the column’s stressing state from the GSED sum-load curve. This reveals the starting point in the failure process of the column and updates its failure load definition. And it is verified that the stressing states of the components constituting the column also present the leap features around the updated failure load. Finally, the formula is fitted to calculate the failure loads with a verification. The essential leap feature of the column’s stressing state is the embodiment of the natural law from quantitative change to qualitative change, which explores a new way to analyze the working behavior of SRC short columns.