预应力混凝土结构在冻融循环条件下的疲劳性能研究  

THE FATIGUE PROPERTIES OF PRE-STRESSED CONCRETE STRUCTURE UNDER THE CONDITIONS OF FREEZE-THAW CYCLE

作　　者：刘荣桂[1] 付凯[1] 颜庭成[1] 

机构地区：[1]江苏大学理学院,镇江212013

出　　处：《工业建筑》2008年第11期75-78,共4页Industrial Construction

基　　金：国家自然科学基金资助项目(50878098);国家自然科学基金资助项目(50678074)

摘　　要：以预应力混凝土试件为研究对象,对不同冻融循环次数条件下的疲劳损伤特性进行分析。混凝土结构在经历一定冻融循环次数后,等效于先进行了一级疲劳加载,根据多级加载疲劳理论,以相对动弹性模量的衰减为参数建立多级疲劳损伤参量,引入冻融损伤因子kn来表征冻融损伤的影响,建立冻融循环条件下的混凝土结构疲劳损伤模型。该模型可考虑试件总体损伤程度。试验验证,模型计算损伤度值与试验值之间的误差在16%以内。The fatigue damage properties of pre-stressed concrete specimen were analyzed under the conditions of different number of freeze-thaw cycle. The first-order fatigue load was applied to the concrete structures in the wake of freeze-thaw cycles. Based on the multi-level loading fatigue theory, taking the decay of a relative dynamic elastic modulus as the parameters to set up a multifatigue damage parameter, and using freeze-thaw damage factor kn to express the effect of the freeze-thaw damage, thus a model of fatigue damage to concrete structures subjected to freeze-thaw cycles was established. The model takes account of the whole specimen injury. The tests show that the error between the calculated damage degree value by the model and that of the test is 16 percent.

关 键 词：预应力混凝土结构 冻融循环 疲劳损伤 损伤模型 

分 类 号：TU378[建筑科学—结构工程] TV672.3[水利工程—水利水电工程]