Title: Study on Seismic Damage Model of Fly Ash Foamed Concrete Wall

Author(s): Yunhong Hao, Hongze Wang, Yupeng Zhao, Chakelehan, and Yong Shi

Publication: Structural Journal

Volume: 121

Issue: 5

Appears on pages(s): 89-98

Keywords: axial compression ratio; damage parameter; fly ash foamed concrete; seismic damage model; shear wall; steel ratio.

DOI: 10.14359/51740855

Date: 9/1/2024

Abstract:
Firstly, the proposed static test was carried out on eight fly ash foamed concrete walls with different axial compression ratios μ and steel ratios ρ. Secondly, the quantitative analysis method of wall damage was proposed based on the crack development theory, and the real damage index was proposed. Then, through theoretical analysis and curve fitting, two kinds of seismic damage models— energy method and Park-Ang-W—were proposed, and the damage values were calculated to compare with the real damage values. Finally, the Park-Ang-W model was used to analyze the parameter expansion of 16 Abaqus wall models with different axial compression ratios μ and steel ratios ρ. The results show that the damage evaluation index based on crack development theory can effectively reflect the damage of fly ash foamed concrete walls. The accuracy of the energy method model is not high at the low number of cycles, and the error is less than 20% at the high number of cycles. The Park-Ang-W model has an error of approximately 10% at a high number of cycles, which better reflects the true damage of the specimen. The axial compression ratio μ has little effect on the wall damage, with a maximum effect range of 6.7%. Increasing the reinforcement ratio can effectively reduce the wall damage, with a maximum effect range of 12.6%. The results of the study provide a theoretical basis for the future application of fly ash foamed concrete in construction projects.