design a bridge to ensure the safety of the construction and use. studies on the structure and properties of materials, structural analysis techniques, construction technology ... is the foundation of the philosophy. on the basis of data on loads, materials and textures used format, a structure is considered safe, "the resistance of the material"> "loading effect". This relationship is a review of all parts of the building structure with different load-bearing characteristics. the state limit is in place to control the work of the structural safety
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