摘要
对于海洋环境下的预应力混凝土结构,各类结构和环境因素如保护层厚度、氯离子扩散系数、氯离子临界浓度以及表面氯离子浓度等对结构在设计使用寿命内耐久可靠性有着至关重要的影响。基于氯离子的扩散侵蚀机理,结合预应力混凝土结构的耐久性失效特点,建立其耐久性失效的极限状态方程,对各耐久性影响参数的敏感性进行理论分析,并基于各参数的统计分布特征进行Monte Carlo仿真模拟,以对结构耐久性设计及工程质量控制提供参考和依据。
For the pre-stressed concrete structure under marine environment, the stochastic characters of structure and environment such as concrete cover depth, initial concentration of chloride ions, chloride diffusion coefficient in concrete, critical concentration of chloride ions and structural surface concentration of chloride ions affect the structural durability in designed service life greatly.Based on the diffusion mechanism of chloride ions, considered the durability failure character of pre-stressed concrete structure, the limit state function of durability failure is established, the sensitivity of durability influencing parameters is analysis, and the Monte Carlo simulation is carded out based on the stochastic characters of influencing parameters, which will provide method and foundation for the structural durability design, construction and quality control of similar project.
出处
《混凝土》
CAS
CSCD
北大核心
2009年第11期4-6,共3页
Concrete
基金
国家科技支撑计划子课题(2006BAJ02B04-01)
深圳大学深圳市土木工程耐久性重点实验室开放基金资助(CED08-16)
关键词
结构耐久性
敏感性分析
预应力混凝土结构
海洋环境
structural durability
sensitivity analysis
pre-stressed concrete structure
marine environment
