钢纤维混凝土桥面连续段力学性能参数分析

发布时间：2018-03-06 18:19

本文选题：混凝土简支梁桥　切入点：钢纤维混凝土　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：混凝土简支梁桥大量采用主梁结构简支、桥面连续的构造形式。但因梁端普通混凝土桥面连续段易于现横向裂缝、破损等病害，加之维修养护不当，相当多的桥梁桥面行车状况较差。针对混凝土简支梁桥桥面连续段出现的病害，论文开展了钢纤维混凝土桥面连续段加固方法研究。在大量调研基础上，论文基于结构力学基本原理，根据工程中常用的混凝土简支梁桥桥面连续的构造特点，建立了桥面连续段结构力学分析方法；根据我国公路桥梁常用的中小跨径混凝土空心板（标准跨径10、13、16、20m）、混凝土T型梁（10、13、16、20、30、40m）和混凝土小箱梁（20、30、40m）三种桥型在结构简支桥面连续构造下，采用有限元方法分别建立了精细化桥面连续构造的三维空间块体数值分析模型；对不同的通用跨径、梁高和本文拟定的钢纤维混凝土段长度（5、25~200cm，按25cm递增）与厚度（8、10、12cm）等设计参数，，分析了不同参数组合下的桥面连续构造在二期恒载和活载组合作用下的应力状态；分别给出了钢纤维桥面铺装横截面拉应力随标准跨径、梁高、钢纤维桥面铺装段长度和厚度的变化规律；提出了与混凝土空心板、混凝土T型梁和混凝土小箱梁跨径和梁高相对应的钢纤维混凝土桥面铺装层的合理设计长度和厚度的建议。本文研究成果可供中小型混凝土简支梁桥旧桥加固设计时参考。
[Abstract]:A large number of simple supported concrete bridges are constructed with simple support of main girder structure and continuous deck. However, because the continuous section of ordinary concrete deck at the end of beam is prone to transverse cracks, damage and other diseases, as well as improper maintenance and maintenance, Due to the failure of continuous section of concrete simply supported beam bridge, the reinforcement method of continuous section of steel fiber reinforced concrete (SFRC) deck is studied in this paper. On the basis of a great deal of investigation and research, based on the basic principle of structural mechanics and the structural characteristics of continuous deck of concrete simply supported beam bridge, the structural mechanics analysis method of continuous section of bridge deck is established. According to the three types of concrete hollow slabs with medium and small span (standard span 10131316m, concrete T-beam 10131316203040m) and concrete small box girder (2030m) which are commonly used in highway bridges in China, three kinds of bridges are under the continuous structure of simply supported bridge deck. By using finite element method, three dimensional block numerical analysis models of continuous structure of fine bridge deck are established, and the design parameters such as different general span, beam height and steel fiber reinforced concrete section length of 525 ~ 200cm, increasing by 25cm and thickness of 8101012cm) are established respectively by using the finite element method (FEM), and the design parameters such as the height of the beam and the length of the steel fiber reinforced concrete section drawn up in this paper are increased by 25cm. The stress state of continuous structure of bridge deck under the combination of dead load and live load under different parameters is analyzed, and the tensile stress of cross section of steel fiber deck pavement with standard span and beam height are given respectively. The length and thickness of steel fiber bridge deck pavement are changed, and the reasonable design length and thickness of steel fiber reinforced concrete deck pavement corresponding to the span and height of concrete hollow slab, concrete T-beam and concrete small box girder are put forward. The research results of this paper can be used for reference in the design of the old bridge of small and medium sized concrete simply supported beam bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.34

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