持续力载条件下碎石混凝土的力学特性研究

Study on Mechanical Properties of Crushed Stone Concrete under Continuous Load Conditions

摘要: 混凝土的应力–应变全曲线在结构强度分析中有着极其重要的作用。本文对碎石混凝土(期龄28 d)、不同围压条件下碎石混凝土试块进行压缩试验，并对试件的变形性能、应力–应变全曲线、特征参数等进行分析。分析得出：围压对碎石混凝土的变形有一定的限制作用，破坏形态由短轴向剪切发展为斜向剪切再转为轴向剪切，且控制裂缝发展走向与延伸，提高了碎石混凝土的强度与变形性能；峰值应力、峰值应变、初始弹性模量也得到不同程度的提高。

Abstract: The stress-strain curve of concrete plays an extremely important role in structural strength analysis. In this paper, the strength test of crushed stone concrete (age 28 d) and concrete blocks with different confining pressures is carried out, and the deformation properties, stress-strain curves and characteristic parameters of the specimens are analyzed. The analysis shows that the confining pressure has a certain limiting effect on the deformation of crushed stone concrete, and the failure form develops from short axial shear to oblique shear and then to axial shear, and the crack development trend and extension are controlled, which improves the strength and deformation performance of crushed stone concrete. The peak stress, peak strain, and initial modulus of elasticity are also improved to varying degrees.