铁路立交桥6times;30m段桥梁的设计
摘要
本次毕业设计是对铁路立交桥6times;30m段桥梁进行设计，本文通过查阅整理国内外相关资料，总结阐述了预应力混凝土箱梁桥的特点、发展技术概况、施工方法，并简单介绍了铁路立交桥的结构主要特点、设计计算方法等问题。
本桥是一座铁路立交桥，主梁形式为预应力混凝土小箱梁，预应力混凝土是在混凝土或钢筋混凝土结构承受荷载之前，提前引入内部应力，而且数值和分布恰好能将使用荷载产生的应力抵消到一个合适的程度，使结构在正常使用的情况下减少开裂的程度甚至是不致开裂，从而提高结构的耐久性和稳定性，延长使用年限。本文通过查阅整理国内外相关文献资料，总结阐述了预应力混凝土箱梁桥的特点、发展技术概况、施工方法，并简单介绍了铁路立交桥的结构主要特点、设计计算方法等问题。
关键词：预应力混凝土铁路立交箱梁桥 内力计算 预应力 施工方法
ABSTRACT
This graduation design is the design of the railway overpass 6times;30m bridge, finishing through access to relevant information at home and abroad, summarizes the characteristics, prestressed concrete box girder bridge development, construction methods, and introduces the main features of the structure, the railway overpass design calculation method etc..
This bridge is a railroad overpass, the main girders for prestressed concrete box girder, prestressed concrete before concrete or reinforced concrete structure subjected to loading, advance into the internal stress, and the value and the distribution of stress can be offset to a suitable degree of use load, the structure used in the normal situation to reduce the extent of cracking or even cracking, so as to improve the structural durability and stability, prolong the service life. Based on the literature review, the characteristics, development technology and construction methods of prestressed concrete box girder bridge are summarized, and the main characteristics and design calculation methods of railway overpass are briefly introduced.
Key words：Prestressed concrete railway overpass bridge；Calculation of internal force；prestress；Construction method
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