A NEW DURABILITY DESIGN METHOD FOR CONCRETE STRUCTURES BASED ON EQUIVALENT RESISTANCE RELIABILITY
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摘要: 在已有混凝土结构耐久性设计理论和方法的研究基础上,提出在大气环境下基于等效抗力时变可靠度的钢筋混凝土结构构件耐久性设计方法。通过算例,对该方法的实用性、可行性进行验证。由计算结果可知,混凝土强度等级和保护层厚度对混凝土结构的耐久性影响显著。其中混凝土强度对时变可靠度的影响至关重要;保护层厚度的影响随混凝土强度等级的提高而减小;钢筋直径对耐久性的影响不明显,且随着混凝土强度的提高或保护层厚度增大,其影响可以忽略不计。Abstract: On the basis of the current durability design theories and methods,a new durability design method is proposed for concrete structures.And it is based on equivalent resistance time dependant reliability under atmosphere environment.To demonstrate the benefit of the method for both feasibility and applicability,a case study is carried out.The results show that both concrete strength and cover thickness have great effect on the durability.But the effect induced by the change of cover thickness can be decreased by enhancing the concrete strength.The influence of change in the steel bar diameter on the durability is negligible with the increase of the concrete grade or raising cover thickness.
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Key words:
- concrete structures /
- equivalent resistance /
- durability /
- time dependant reliability
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