According to the above reasons, two kinds of methods are adopted to optimize the box-main-girder bridge.
基于以上原因，本文采用了两种方法对箱形梁桥架进行优化设计。
The box type structure, cavity cannot antirust paint corrosion, in order to prevent moisture intrusion corrosion beam cavity, sealing the inner cavity of the main girder must keep.
箱型结构的主梁，内腔无法涂漆防锈蚀，为了防止水汽侵入腐蚀主梁内腔，必须保住主梁内腔的密封性。
The stress and deformation of the concrete box girder under the temperature load is one of the main factors affecting engineered quality.
温度荷载作用下的混凝土箱梁的应力和变形，是影响工程质量的主要因素之一。
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