混合装配无粘结预应力梁加固试验研究

本文采用碳纤维布和外包钢两种加固方法,对6个混合装配无粘结预应力梁进行了低周反复加载试验。考虑了初始预应力度、后穿非预应力筋的强度、面积和不同加固方法等参数变化。试验表明:采用无粘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,加固后构件自恢复能力仍然较强(残余变形小),在较大非线性位移下试件破坏较少。文中分析了加固与未加固试件的恢复力特性、延性、耗能等抗震性能与试验参数的关系,为其今后在地震地区的施工和设计提出一个经济、合理的建议。

Strengthening Experiment Research of Hybrid Precast Unbonded Post-tensioned Concrete Beams

The test of 6 hybrid precast unbonded post-tensioned concrete beams under reversed cyclic loading is carried out.Such parameters as PT initial post-tensioning load,full grouted mild steel strength,steel area and different strengthening methods are described.Experiment shows that these beams used hybrid precast method can improve the energy dissipation and bearing capacity of specimens than others.After strengthened 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 strengthened and no strengthened specimens are analyzed.The study is initiated to provide data for the development of a rational and economical design and construction procedure for such connections in seismically active regions.