Durability Design Based On Probability Theory For RC Structures Under The Ultimate Limit State

Reinforced concrete structure in the long-term environmental effects, mainly to steel corrosion durability damage not only affect the normal use of a functional structure, due to corrosion even greater degree to reduce its carrying capacity, at present, in order to study the structure durability design suitability analysis Lord, durability of the safety problem caused by insufficient system design approach has not yet formed. Paper-based security model to establish the durability of the design of the structure of the proposed structure, the structure of design life of concrete cover thickness and concrete strength design; on existing structures, it can serve time as a design variable, existing structures were predicted service life. Thesis research has important theoretical and practical significance to evaluate the durability of the design and durability of the existing structure of the new structure.Paper with a probability limit state design methods, the establishment of a specific limit state equation, and proposed based on the durability of ultimate limit state design model combined with a sense of probability reliability theory. Specific studies include:(1) Combined corroded reinforced concrete failure process and failure modes of bending member and bending member, analyzed from the concept proposed to achieve the compressive strength of the concrete compression zone design value as a sign of failure durability.(2) According capacity calculation model of corroded components, establish the durability of the limit state equation flexural members and bending member, derivation function expression concrete compression zone with stress durability degradation derivation physical meaning and mathematical analysis the variation of stress with the structure and properties of concrete degradation, limit state equation solving basis.(3) Combined with the durability of concrete failure logo and design specifications, analysis gives a reliable indicator of the value of the target level, and the thickness of the protective layer of concrete compressive strength of concrete as a random variable, the probability of the durability of concrete structures made using partial coefficients Expression Design model, and finally the use of the model is specifically designed to protect concrete layer thickness.