Restoring force model of fiber lithium slag concrete column in saline soil environment

In order to study the seismic behavior of polypropylene fiber lithium slag concrete (PLiC) columns in saline soil environment,low-period cyclic load tests of six columns were conducted. On account of the test results,the four-polyline skeleton curve was obtained. Based on the research of many scholars, considering the role of additives, obtaining the calculation formula of correction coefficient of each characteristic point by regression analysis. Introducing stiffness degradation index μ and damage factor D to combine the effects of erosion time,using the hysteretic rule applicable to the attenuation of bearing capacity and stiffness degradation of PLiC column to establish the force-displacement restoring force model of PLiC column under saline soil environment. The results showed that polypropylene fiber and lithium slag could improve durability and the mechanical properties such as ultimate bearing capacity,ductility of concrete columns. The skeleton curve and hysteresis curve obtained from the established restoring force model are in good agreement with the test results,which can provide a reference for the nonlinear analysis of seismic performance of polypropylene fiber lithium slag concrete columns in saline soil environment. © 2024 Editorial Board of Jilin University. All rights reserved.