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为研究预制与后浇混凝土粘结后的动态劈拉性能,利用Ф74mm变截面分离式霍普金森压杆装置对不同粘结面粗糙度类型的预制与后浇混凝土进行了不同应变率的动态劈拉试验。结果表明:预制与后浇混凝土的动态劈拉强度和动态增大系数均表现出较强的应变率效应;预制与后浇混凝土的动态劈拉应力—应变曲线可分为线性阶段、非线性阶段和破坏阶段;混凝土试块出现了径向与粘结面均劈裂,试块径向劈裂两种主要破坏形态;增大预制与后浇混凝土粘结面的粗糙度,其动态劈拉应力-应变曲线中屈服台阶越明显,体现出明显的延性特征,且提高预制与后浇混凝土粘结后的动态劈拉强度。
In order to study the dynamic splitting performance of precast and post-cast concrete, the dynamic splitting of prestressed and post-poured concrete with different bonding surface roughness was carried out by split Hopkinson pressure bar with Ф74mm variable section. Pull test. The results show that dynamic splitting tensile strength and dynamic increasing coefficient of precast concrete and post-poured concrete both show strong strain rate effect. Dynamic splitting tensile stress-strain curves of precast concrete and post-poured concrete can be divided into linear phase, nonlinear phase And failure stage. There are two kinds of main failure modes of the concrete specimen, such as radial and bonded surface splitting and radial splitting of test block. The roughness of the bonded surface of precast and post-cast concrete increases, and the dynamic splitting tensile stress - The strain curve of the yield step is more obvious, showing obvious ductile characteristics, and improve the dynamic splitting tensile strength after pre-bonded and post-cast concrete.