Compressive constitutive models of bamboo and fiber-reinforced phosphogypsum and axial compression properties of composite short columns

Abstract

Bamboo is an ideal building material with green, fast growing and good mechanical properties. Phosphogypsum is a kind of solid waste residue with low resource utilization and has been used as building material. Finite element analysis is an important means of structural research. In this paper, the stress-strain constitutive models of bamboo and phosphogypsum were explored based on material tests, and axial compression tests of three bamboo-phosphogypsum composite short columns were carried out. Based on the constitutive models, the simulation and test results of composite short columns were compared by finite element analysis. The results show that the finite element analysis has high accuracy. The finite element analysis of 32 models was carried out considering the influence of bamboo tube wall thickness, bamboo tube density, phosphogypsum fiber ratio, bamboo tube longitudinal reinforcement and stirrup. The results show that the bearing capacity of composite short columns increases with the increase of bamboo tube wall thickness, bamboo tube density, phosphogypsum fiber ratio, longitudinal reinforcement diameter and density, and stirrup diameter and density. The thickness of bamboo tube wall and density of bamboo tube have a significant effect on the bearing capacity of composite short columns. A method for calculating the bearing capacity of composite short columns was presented, which has high accuracy. • The constitutive models of bamboo and phosphogypsum were proposed. • A kind of bamboo-phosphogypsum composite short column was proposed. • A theoretical calculation method for the bearing capacity of bamboo-phosphogypsum composite short columns was established.