既有RC旧梁与新梁承载能力对比试验研究

目前关于梁的承载能力试验多为室内的小梁,这与实际工作情况下桥梁的受力状态并不完全相同,它们之间是否可以相互借鉴,相似程度如何,值得探讨。采用从现役桥梁上替换下来的旧梁与实验室制作新梁进行破坏荷载对比试验,能够反映经过多年运营后具有一定疲劳累积损伤旧梁的变形性能和实际承载能力。同时建议验算旧桥承载能力时应乘以小于1的数。

Comparison Test Study on the Bearing Capacity of the Old and the New RC Beams

At present,indoor small beams have been used for bearing capacity tests,which cannot reach the same load conditions as bridges under the actual circumstances.If they can be used as reference for each other,and how far their similarity could be discussed.A destructive load comparison test between the old beam being replaced from bridge and the new beam produced for laboratory use has been conducted,which can reflect the deformation properties and the actual bearing capacity of the old beams after many years of cumulative fatigue damage.At the same time,a coefficient less than 1 has been given as for calculation of bearing capacity of old bridges.