混合装配无黏结预应力梁试验

Experiment of Hybrid Precast Unbonded Post-tensioned Concrete Beams

为了提高预应力装配结构的耗能能力和抗震性能,对3个混合装配无黏结预应力梁进行了低周反复加载试验研究,考虑了初始预应力度、后穿非预应力筋的强度和面积等参数变化.分析了混合装配梁的恢复力特性、耗能等抗震性能与试验参数的关系,试验结果表明:采用无黏结预应力混合装配的梁,在耗能和承载能力等方面比全预应力装配构件有所提高,构件自恢复能力仍然较强(残余变形小),较大非线性位移下试件破坏较少。

This test research 3 hybrid precast unbonded post-tensioned concrete beams under reversed cyclic loading. Such parameters as PT initial post-tensioning load , full grouted mild steel strength and area are described. Experiment shows that these beams used hybrid precast method can improve the energy dissipation and bearing capacity of specimens than others. The hybrid precast specimens still have desirable seismic characteristics such as a self-centering capability and an ability to undergo large nonlinear displacements with little damage. Resilience, ductility, energy dissipation of specimens are analyzed. The study was initiated to provide data for the development of a rational and economical design and construction procedure for such connections in seismically active regions.