预应力混凝土梁实际刚度的测试及分析

Test and analysis of practical stiffness of prestressed concrete beam

用挠度法计算预应力梁的残余预应力时,预应力梁的实际刚度是一个难以确定的参数,要测试刚度就必须借助于可直接测量的挠度来推算。测试的结果表明预应力梁的实际刚度总是小于规范中的计算刚度。依据这种试验方法,可以测试在役的预应力混凝土梁的当前实际刚度,这就为计算在役梁的残余预应力提供了可能。

Practical stiffness of prestressed beam has been a difficulty parameter to determine in calculating residual prestressing of the beam by deflection method. The deflection of measurment directly is needed to test stiffness. The result shows that the practical stiffness of prestressed beam is always less than the calculated stiffness in the standard. According to this method, the present stiffness of the prestressed beam which is being used can be tested. Therefore, it is possible to calculate the residual prestressing of the using beam.