New buildings should appropriately improve the reliability and durability of the structure, including load design standards, wind pressure resistance and seismic fortification level.
Under the condition of ensuring safety and durability, the material consumption should be controlled by optimizing the structural design, and the following requirements should be met:
1) According to the mechanical characteristics, choose the structural system with less material consumption.
2) In high-rise and long-span structures, steel structures, steel-concrete mixed structures and steel-concrete composite members should be adopted reasonably.
3) For the steel structure controlled by deformation, firstly, it is necessary to adjust and optimize the layout of the steel structure and the section of members to increase the rigidity of the steel structure; For steel structures controlled by strength, high strength steel should be preferred.
4) In the long-span concrete floor structure, prestressed concrete technology and cast-in-place concrete hollow floor technology are adopted reasonably.
5) A new structural system integrating material saving and energy saving should be adopted.
6) The basic scheme should be adapted to local conditions, and reasonable stress, construction safety and environmental protection should be fully considered.
High-performance structural materials shall be used reasonably, and the following requirements shall be met:
1) The wall columns of high-rise concrete structures and the horizontal members of long-span structures should be made of high-strength and high-performance concrete.
2) High-rise steel structures and long-span space structures should adopt light high-strength steel.
3) High-strength steel bars should be selected as the stressed steel bars.
Buildings that have reached or will soon reach the designed service life of the structure shall be evaluated for structural reliability such as safety, applicability and durability according to the requirements of the current relevant national standards. According to the requirements of structural reliability evaluation, it can continue to be used according to the expected service life after taking necessary reinforcement and maintenance measures.
Reconstruction and expansion projects shall retain the structural members of the original building, and carry out necessary maintenance and reinforcement of the structural members of the original building.
Due to the change of building function, structural storey addition, reconstruction and expansion, the overall stiffness of the building and the bearing capacity of structural members can not meet the requirements of the current structural design code, or the standard level of seismic fortification needs to be improved, the reinforcement scheme of the overall structure and structural members should be optimized, and the structural system reinforcement scheme should be given priority.
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