JIPlKIC 结构设计原理 The principle of structure design Normal limit state checking: In addition to reinforced concrete strength may be due to reasons such damage orfailure to achieve ultimate limit state,it also may be due to components such as excessive distortion or cracks in the applicability and durability of components,but not reach the structure of the normal requirements.Therefore,for all reinforced concrete structures are required for bearing capacity,while some of the components,but also according to the normal conditions of use for checking limit state to ensure that undernormal use stress,cracks and distortion is less than normal Limit state limits. ⚫ Normal limit state checking: In addition to reinforced concrete strength may be due to reasons such damage orfailure to achieve ultimate limit state, it also may be due to components such as excessive distortion or cracks in the applicability and durability of components, but not reach the structure of the normal requirements. Therefore, for all reinforced concrete structures are required for bearing capacity, while some of the components, but also according to the normal conditions of use for checking limit state to ensure that undernormal use stress, cracks and distortion is less than normal Limit state limits