预应力圆形水池预应力损失计算

Calculation of prestress loss for circular prestressed concrete water tanks

为了更加合理、高效地计算预应力圆形水池的预应力损失,基于摩擦理论,利用变形协调条件,通过理论分析,验证推导出了CECS 216:2006《给水排水工程预应力混凝土圆形水池结构技术规程》中不同工况下的预应力损失计算公式,并对σa、σb的计算公式进行了补充,从理论上分析了CECS 216:2006与GB 50010-2010《混凝土结构设计规范》关于预应力损失计算方法的差异。通过具体算例计算结果比较可知:对于预应力圆形水池应优先采用切线出肋方式,以减小预应力损失;CECS 216:2006与GB 50010-2010的计算结果差别约为10%,故可采用GB 50010-2010的计算方法以简化计算过程。

In order to calculate the prestress loss of circular prestressed water tanks more reasonably and efficiently,based on the theory of friction,and by using the deformation coordination condition and through the theoretical analysis,the calculation formulas of prestress loss under different working conditions in CECS 216:2006"Technical specification for structure of circular prestressed concrete water tanks of water supply and sewerage engineering"are derived and verified,the calculation formulas ofσa andσb are supplemented,and the difference of calculation methods for prestress loss in CECS 216:2006 and GB 50010-2010"Code for design of concrete structures"is also analyzed theoretically.It is known from the calculation results of specific calculation example that,the method of the tangent rib reinforcement is adopted preferably for the circular prestressed concrete water tank to reduce the prestress loss,and the difference between the calculation results of CECS 216:2006 and GB 50010-2010 is about 10%,therefore the calculation method in GB 50010-2010 can be used to simplify the calculation.