大气环境下预应力结构的耐久性设计理论  

Design theory of durability of pre-stressed structure in atmospheric environment

作　　者：刘荣桂[1] 陆春华[1] 

机构地区：[1]江苏大学理学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2006年第6期541-544,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50478089);江苏省自然科学基金资助项目(BK2003050)

摘　　要：针对现代预应力混凝土结构耐久性失效的特点以及结构耐久性具体要求,详细论述了预应力结构耐久性设计的主要内容;随后就大气碳化环境这一指标,提出了预应力结构构件耐久性极限状态的定义形式,并给出了一种以结构耐久性能和可靠度理论为基础的结构耐久性设计方法,该方法与现行结构承载力设计的可靠度设计方法相似,采用分项系数r(安全系数)来反映结构可靠指标;并在此基础上给出了一定设计使用年限、一定可靠指标下结构耐久性设计时保护层厚度的计算表达式.算例分析表明,该设计方法简单、实用,便于工程设计人员使用.Based on the characters of durability failure of modem pre-stressed concrete structure and requirements on structural durability, the primary contents about durability design are introduced in detail. Then, concerning the carbonation environment, the definition of durability limit for pre-stressed concrete structure is given, and a design method of durability which is based on structural durability performance and reliability theory is also provided. The method is similar to current reliability design of structural bearing capacity, and adopts subentry coefficient r to reflect structural reliability index. At last, some analytic results of example verify that our metilod is practical, simple and easy to use.

关 键 词：预应力混凝土结构 碳化环境 结构可靠度 极限状态 耐久性优化设计 

分 类 号：TU528.571[建筑科学—建筑技术科学]