全体外预应力节段预制拼装箱梁桥地震响应规律研究

发布时间：2019-05-28 03:43

【摘要】：芜湖长江公路二桥引桥是国内首座全体外预应力节段拼装轻型薄壁箱型连续梁桥,工程规模宏大,实行了高度的工厂化、标准化、装配化,保证了质量,提高了耐久性,并能做到可检查、可维修、可更换,为该类桥梁的运营养护提供了极大的方便。该结构形式设计新颖,与国内传统连续梁相比具有重大的创新,提高了体外预应力的使用效率,大大降低了混凝土用量,减轻了桥梁结构自重,直接经济效益显著。但是,由于国内外针对该类桥型的相关抗震研究较少,且震害资料鲜见,尚无完整的抗震设计理论和方法,给其抗震设计和抗震构造措施设置带来了较大困难,会严重阻碍该类桥型的推广应用。因此,本文以芜湖长江公路二桥引桥为依托工程,针对全体外预应力节段预制拼装箱梁桥的抗震有限元建模、结构动力特性及地震响应规律进行深入研究,主要内容如下:(1)掌握国内外相关对体外预应力桥梁、节段预制拼装桥梁的研究状况,特别是对动力性能、抗震设计等方面的研究成果进行较为全面的综述。(2)以芜湖长江公路二桥引桥为依托工程,进行全体外预应力节段预制拼装箱梁桥的实桥现场动力特性试验。(3)建立全体外预应力节段预制拼装箱梁桥的多尺度、精细化抗震有限元建模方法。(4)通过实桥现场动力特性试验数据与精细化抗震有限元模型、杆系抗震有限元模型的计算结果进行对比分析,验证精细化抗震有限元建模方法的正确性,研究全体外预应力节段预制拼装箱梁桥动力特性对重要设计参数的敏感度。(5)研究全体外预应力节段预制拼装箱梁桥的地震影响规律,特别是上部节段梁关键构造可能产生的特殊震害。
[Abstract]:Wuhu Yangtze River Highway approach Bridge is the first light thin-wall box continuous beam bridge assembled by all external prestressed segments in China. The project is large in scale and has carried out a high degree of factory, standardization and assembly, which ensures the quality and improves the durability. It can be checked, repaired and replaced, which provides great convenience for the operation and maintenance of this kind of bridge. Compared with the traditional continuous beam in China, the design of the structure is novel, which improves the efficiency of external prestress, greatly reduces the amount of concrete, reduces the weight of the bridge structure, and has remarkable direct economic benefits. However, due to the lack of seismic research on this kind of bridge at home and abroad, and the rare seismic damage data, there is no complete seismic design theory and method, which brings great difficulties to its seismic design and seismic structural measures. It will seriously hinder the popularization and application of this kind of bridge type. Therefore, based on the approach bridge of Wuhu Yangtze River Highway, the seismic finite element modeling, structural dynamic characteristics and seismic response law of all prefabricated box girder bridges with external prestressed segments are deeply studied in this paper. The main contents are as follows: (1) to master the research status of external prestressed bridges and segmental prefabricated bridges at home and abroad, especially for dynamic performance. The research results of seismic design are summarized comprehensively. (2) based on the approach bridge of Wuhu Yangtze River Highway, The field dynamic characteristics test of all prefabricated box girder bridges with external prestressed segments is carried out. (3) the multi-scale of prefabricated assembled box girder bridges with all external prestressed segments is established. Fine seismic finite element modeling method. (4) the calculation results of fine seismic finite element model and rod system seismic finite element model are compared and analyzed by comparing the field dynamic characteristic test data of real bridge with the calculation results of fine seismic finite element model and rod system seismic finite element model. The correctness of the fine seismic finite element modeling method is verified. The sensitivity of the dynamic characteristics of all prefabricated box girder bridges to important design parameters is studied. (5) the seismic influence of all prefabricated assembled box girder bridges with external prestressed segments is studied. Especially the special earthquake damage caused by the key structure of the upper segmental beam.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U448.213

【参考文献】