钢纤维混凝土桥面连续段力学性能参数分析-桥梁与隧道工程专业论文.docxVIP

万方数据 万方数据 Parameter analysis of continuous mechanical performance of steel fiber reinforced concrete deck A Dissertation Submitted for the Degree of Master Candidate：Yu Haiyang Supervisor：Prof. Song Yifan Chang’an University, Xi’an, China 万方数据 万方数据 万方数据 万方数据 万方数据 万方数据 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。 关键词：混凝土简支梁桥，钢纤维混凝土，桥面铺装，桥面连续 i Abstract Simply-supported concrete bridges are usually equiped with simply-supported girder structure and continuous bridge deck. But transverse cracks and damages are likely to occur at continuous concrete deck located at the ends of the girder, and coupled with poor maintenance and repair. Driving condition of considerable bridge decks are very poor. Due to the disease of continuous concrete bridge deck in Simply-supported concrete bridge, this paper studied the steel-fiber reinforced concrete bridge deck and reinforcement method. With a large number of research and based on the basic principle of structural mechanics, and according to the structure characteristics of continuous concrete bridge deck in Simply-supported concrete bridge. This paper established structural mechanics analysis method in continuous concrete deck. According to the small and medium-span concrete hollow board with the standard span of 10m, 13m, 16m and 20m, concrete T-beam with the standard span of 10m、13m、16m、20m、30m and 40m, and concrete box beam with the standard span of 20m, 30m and 40m which are simply supported and wit