摘要
对比分析了中国公路桥涵设计规范审批稿和混凝土结构设计规范有关混凝土结构疲劳设计的规定 ,按相应规范验算了 1 2根吊车梁、6根预应力混凝土及 2根钢筋混凝土简支 T型梁桥主梁的疲劳承载能力 ;对比分析了吊车梁与桥梁所受荷载的差异以及相应构件压区混凝土和拉区钢筋在应力水平、应力幅、应力比等方面的差异 ,并初步探讨了公路钢筋混凝土桥涵的疲劳问题 ,指出了公路桥涵设计规范在结构疲劳设计方面的不足 。
This paper compares and analyzes fatigue des ig n roles of concrete structures about examination and approval draft of code for design of highway bridges and culverts and code for design of concrete structure s,proofs computations of fatigue capability of twelve crane beams and six prestr essed concrete T-beams of simply-supported bridge and two reinforced concrete T-beams of simply-supported bridge,compares and analyzes the differences of lo a d of crane beam and bridge and the differences in stress level,stress amplitude and stress ratio of correspond component's compressive zone of concrete and tens ile reinforcing bar,discusses the fatigue problem of reinforced concrete highway bridges and culverts,points out the shortage of code for design of highway brid ges and culverts,gives some interrelated advise.
