后张法预应力梁瞬时损失设计与试验研究

从设计的角度将应用塑料波纹管和金属波纹管的后张法预应力框架梁瞬时预应力损失进行分析比较。通过对应用塑料波纹管的后张法预应力框架梁进行现场试验,监测框架梁张拉过程产生的摩擦损失、锚固损失、反拱和应变,回归出孔道偏差系数κ和孔道摩阻系数μ,并将摩擦损失和锚固损失的计算值与实测值进行对比。研究结果显示设计中采用的κ=0.0015和μ=0.15比较接近实测值。

DESIGN AND EXPERIMENTAL STUDY ON INSTANT LOSS OF POST-TENSIONED PRESTRESSED BEAMS

This paper comparatively analyzed the instant loss of post-tensioned prestressed frame beams by using embedded metal corrugated pipe and corrugated plastic pipe from the view of design.Then a site experimental study of post-tensioned prestressed frame beams by using corrugated plastic pipe was carried out to monitor the friction loss,anchorage loss,inverted arch and strain during tensioning process.The coefficient of deviation k and the coefficient of conduit friction μ were regressed.The theoretical and experimental values of friction loss and anchorage loss were compared.The research result shows parameters κ = 0.001 5 and μ = 0.15 adopted in the design are close to experimental value.