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The pile-anchor supporting system is wildly used in the excavation supported system, and waist beams play an important role in the supported system. If the waist beam is destroyed, it may lead to the collapse of the retaining structure. But now, the designers tend to ignore the specifically designed for it, some one use the single span beam to design the waist beam, this is too conservative. The others use the continuous beam to calculate, although it is reasonable in the ideal state, but there are lots of uncertain factors on the construction site, which will be some risk. So we will give some reasonable suggestions by comparing several common waist beams' calculation method.

Study on the Bending Moment of waist beam for the Excavation Retaining Structure