结构轻骨料混凝土的应力-应变全曲线

Stress-Strain curves of structural lightweight aggregate concretes

测定了采用高强轻骨料配制的强度等级LC30～LC55的结构轻骨料混凝土(LWAC)的应力-应变全曲线。该强度范围的LWAC应力-应变全曲线的方程可采用与现行设计规范中普通混凝土相同的形式,但其中系数不同;实验与拟合结果吻合良好。LWAC应力-应变全曲线的峰值应力与峰值应变、收敛点应力和拐点应力都有良好的线性关系,峰值应变为(2 01～2 93)×103με。在同等峰值应力情况下,结构轻骨料混凝土的峰值应变比普通混凝土的约大600με。

The whole stress-strain curves of structural lightweight aggregate concrete (LWAC) with strength grade from LC30 to LC55 were obtained experimentally.The curves are fitted very well with the same form of equations for normal weight concrete as suggested in the structural design code,but with different coefficients of fitting.Peak stress of structural LWAC is linear with peak strain,convergence point stress and inflection point stress.The peak strain of LWAC is (2.01～2.93)×10~3με and is about 600με larger than that of normal weight concrete at the same peak stress.