Flexural Fatigue Deformation and Fatigue Life of HS-SHCC
ZHOU Jiajia
DONG Zehua
CHEN Benfa
JING Chuan
ZHAO Jun
Abstract：Four-point bending fatigue tests were carried out on high strength strain hardening cementitious composite(HS-SHCC)specimens with compressive strength of 83.41 MPa.The crack propagation,mid-span deflection and fatigue life of HS-SHCC specimens at different stress levels(0.70、0.80、0.85、0.90)were studied.The results show that the fatigue life of HS-SHCC specimens decreases with the increase of stress level.The HS-SHCC specimens show multi-cracking characteristic under flexural fatigue loads.As the stress level decreases,the crack numbers on the surface of the specimens show a decreased trend.At the stress level 0.70-0.85,the mid-span deflection of HS-SHCC displays obvious three stages of rapid development,stable development and instability.At the stress level 0.90,the mid-span deflection of HS-SHCC specimens shows two stages of stable development and instability.Similar to ordinary SHCC,the stress level-fatigue life curves(λ-Nf curve)of HS-SHCC specimens show a bilinear trend.Based on the obtained λ-Nf curve and the three-parameter Weibull distribution theory,a flexural fatigue life prediction model of HS-SHCC under different failure probabilities is proposed.On this basis,the maximum stress level corresponding to the fatigue strength limit(corresponding to 2 million fatigue cycles)of HS-SHCC is predicted to be 0.618 when the failure probability is 0.05.
Keywords：high strength strain hardening cementitious compositeflexual fatiguefatigue deformationfatigue life prediction
Publication Date：2025-03-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 193-201 )