热-力耦合作用下钢纤维混凝土性能研究

Properties of Steel Fiber Reinforced Concrete under Thermal-Force Coupling

旨在从应变能的吸收与释放的角度探寻钢纤维对混凝土在热-力耦合作用下的力学性能与变形性能的改善作用以及对声发射特性的影响,以0.4水胶比的钢纤维混凝土与基准混凝土为研究对象,研究了其在30%的极限荷载作用条件下,在不同温度下的力学性能与变形性能,并且通过声发射检测系统实时监测混凝土在热-力耦合作用下的损伤。结果表明:钢纤维掺入混凝土后,可以有效提高混凝土的抗压强度以及抗压强度残余率,抑制混凝土的热膨胀变形,提高混凝土应变能的吸收与释放。

From the angle of strain energy absorption and release,aims to research the effect of steel fiber on the mechanical as well as deformation properties and the acoustic emission characteristics of concrete under thermal-force coupling.The research explored the mechanical and deformation properties of steel fiber reinforced concrete and reference concrete with 0.4 water to binder ratio,under 30%ultimate load and at different temperatures.Besides,the damage of concrete under thermal-force coupling was monitored by acoustic emission detection system in real time.The figures show that steel fiber can effectively improve the concrete compressive strength and the residual rate of compressive strength,restrain the thermal expansion of concrete in high temperature and improve the absorption and release of strain energy of the concrete.