What are the design requirements for basements in Guangdong?

What are the basement design requirements in Guangdong?

1) Basements with a length of150m or more shall be provided with induced joints in principle.

2) Basement floors are generally designed as thick plates; All floors of the basement are inclined and drained according to the structure.

3) The thickness of the first floor roof of soilless level 6 civil air defense basement is 220mm, and that of level 6 civil air defense basement is 200mm in other cases; The thickness of the basement roof is180mm; ; Generally, the total length of the roof gluten is φ 12 @ 200, and short bearing bars with a spacing of 200 are arranged where the bending moment is not satisfied, which are staggered with the total length gluten.

4) When considering the civil air defense load, the roof of civil air defense basement should be calculated as plastic board, and the plasticity coefficient is1.2 ~1.4; According to Article 4.6.6 of Code for Civil Air Defense, the calculated bending distance of mid-span section of slab can be multiplied by a reduction factor of 0.7. Civil air defense roof should still meet the requirements of strength and crack under normal service load.

5) The beam and slab (including bottom plate and top plate) and internal and external walls of the basement shall adopt the concrete strength of 60 days. In general, C30 should be adopted, and it should not exceed C35；; In order to reduce the hydration heat and avoid cracking, it is not necessary to agree that the strength grade of concrete in the basement side wall is lower than that in the basement column or shear wall.

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