基于纤维-骨料细观分布的自密实钢纤维混凝土单调和循环压缩性能研究OA北大核心CSTPCD

The compressive performance,component content,and dispersion state of self-compacting steel fiber reinforced concrete(SFRSCC)are significantly correlated.To investigate these correlations,SFRSCC prism specimens were prepared using mixtures with different component proportions.Monotonic and cyclic compression tests were conducted to explore the compressive performance characteristics.The coarse aggregate content was described using the percentage of coarse aggregate area,and the steel fiber content and dispersion were quantified as VORONOI toughening area statistics.The correlations between the compressive mechanical properties and the internal component content and distribution characteristics were established.Based on the aforementioned correlations,constitutive equations for the monotonic and cyclic compression elastoplastic damage behavior of SFRSCC structures were established.The results show that increasing the coarse aggregate content can improve the elastic modulus and peak strength of the matrix.Increasing the fiber dosage reduces the toughening area required by the steel fibers and delays the accumulation of post-peak plastic deformation.During the self-compacting process,increasing steel fiber dosage can suppress the increase of the coarse aggregate content,which requires a balance between the Voronoi area and the percentage of coarse aggregate area to meet the requirements of toughening and strengthening.The constitutive equations for the monotonic and cyclic compression elastoplastic damage behavior of SFRSCC structures can realize analysis of the local compressive performance of SFRSCC structures.