本文通过既有给水排水工程构筑物实际使用年限的调查和研究对象在承载能力极限状态、正常使用极限状态下的可靠指标计算,为《给水排水工程构筑物结构设计规范》(GB50069-2002)修订后规定构筑物的设计使用年限提供了依据。提出了设计构筑物顶板等构件时需提高永久作用分项系数的建议,并核算了设计使用年限提高到100年时造价的增加情况。 This article through the existing water supply and drainage engineering structure of the actual useful life of the survey and research object in the ultimate bearing capacity limit, the normal use of the limit state of the reliable indicators for the “water supply and drainage engineering structure design specification” (GB50069-2002) after the amendment The design of the structure provides the basis for the useful life. The suggestion of improving the sub-coefficient of perpetual effect when designing the roof and other components of the structure is proposed and the increase of the cost when the service life of the design is increased to 100 years is calculated.