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一、前言在农田水利、水资源开发利用、国防建设等工程中兴建的输水管道,往往需要渡越江河、港湾。为了保证正常通航,有时不可能构筑围埝明挖施工,近年来,国内外采用预制大口径薄壳管道,用沉管法施工,这种方法具有安全可靠、造价便宜、施工方便等优点。对薄壳体进行设计时,主要控制因素是两项:一是结构的强度;二是结构的弹性稳定性,许多实例表明,在某些情况下,这类结构的失效,并非由于应力超过了材料的强度,却是工程
I. INTRODUCTION Water pipelines built in farmland water conservancy, water resources development and utilization, national defense construction and other projects often need to cross rivers and harbors. In order to ensure normal navigation, it is sometimes impossible to build a cofferdams. In recent years, prefabricated large-diameter thin-walled pipes have been constructed at home and abroad and constructed by immersed tube method. This method is safe and reliable, low in cost and convenient in construction. There are two main control factors when designing a thin shell: one is the strength of the structure and the other is the structural elastic stability. Many examples show that in some cases the failure of such structures is not due to stress exceeding The strength of the material, it is engineering