摘要
施工期间的预应力钢筋混凝土结构,是时变结构体系,除承受施工荷载外,还承受预应力等效荷载,因缺乏理论支持,其设计施工容易出现问题.本文介绍的某工程实例为预应力钢筋混凝土结构,且设计有跨后浇带与不跨后浇带两组预应力钢筋,施工期间后浇带两侧结构出现过大变形差,影响结构施工安全,通过将后浇带钢筋的约束作用简化为弹性支座,分析对象简化为弹性支座连续梁,并考虑施工荷载和等效预应力荷载,分析了该工程出现过大变形的原因,结合预应力筋锚固角度等参数分析,给出了留后浇带预应力钢筋混凝土结构设计施工的建议.
<Abstrcat> The prestressed reinforced concrete structure during construction is a time-dep endent structural system. The loads acting on the structure include con struction load and prestressed equivalent loads. Because of lacking of theory, t he errors usually appear in the design and construction of the structure. For ex ample, one real engineering is a prestressed reinforced concrete structure, and two sets of prestressed steel bar are designed, one comes through the strip of p ost pouring concrete and the other don't, moreover abnormal deformation is produ ced in construction of the structure. Therefore a continuum beam with elastic se at coming from the restrict of steel bar in a strip of post pouring concrete is proposed, considering the construction loads and prestressed equivalent loads, f urthermore causes of abnormal deformation are analyzed. The parameters of ancho r angle of prestressed steel bar and stiffness of elastic seat, etc. are studie d, then the suggestions for design and construction of prestressed concrete str uctures with a strip of post pouring concrete are given.
出处
《华中科技大学学报（城市科学版）》
CAS
2005年第2期8-12,共5页
Journal of Huazhong University of Science and Technology
基金
国家自然科学基金资助项目(50378051)
中国博士后科学基金资助项目(2003033159).
关键词
预应力钢筋混凝土结构
设计
施工
施工荷载
等效预应力荷载
变形
prestressed reinforced concrete structures
design
construction
construction load
prestressed equivalent loads
defl ection
