预应力度对梁徐变系数与徐变挠度系数数值关系的影响  

Numerical Relationship Between Creep Coefficient and Creep Deflection Coefficient of Prestressed Concrete Beams Effected by Partial Pre-stressing Ratios

作　　者：王俊[1,2] 赵静超 刘立新[2] 

机构地区：[1]许昌学院土木工程学院,河南许昌461000 [2]郑州大学土木工程学院,河南郑州450001 [3]河南省建筑设计研究院,河南郑州450014

出　　处：《郑州大学学报（工学版）》2013年第5期26-30,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省科学技术研究重点项目(12A560009);许昌市科技攻关重点项目(2127)

摘　　要：预应力混凝土梁的徐变挠度是其长期挠度主要组成部分,搞清梁的徐变系数与徐变挠度系数间数值关系对准确预估其长期挠度十分关键.对长期加载的预应力梁徐变变形运用ANSYS软件进行模拟分析,讨论了预应力度值对预应力梁徐变系数与徐变挠度系数数值关系的影响.结果表明,对全预应力梁,徐变挠度系数大于徐变系数;对部分预应力梁,徐变挠度系数小于徐变系数.与文献[1]中对预应力梁徐变应变几何模型的解析法分析结果一致.研究结论可为工程中建立精确的预应力混凝土梁长期挠度计算模式奠定基础.To pre-stressed concrete beams, it is very important to forecast long-term deflection accurately to figure out numerical relationship between creep coefficient and creep deflection coefficient. By analyzing creep deformation of pre-stressed concrete beams under long-term loaded in ANSYS software, and studying numerical relationship between creep coefficient and creep deflection coefficient while creep coefficient also PPR of beams are different, or beam creep coefficient is same but different PPR. Then the results show that full-pres- tressed concrete beams creep deflection coefficient is greater than creep coefficient, while the opposite is true for partial-prestressed beams. Moreover, this conclusion was further proven by analytical method to creep strain geometry model. This result may be useful for establishing accurate long-term deflection calculation model of pre-stressed concrete beams.

关 键 词：预应力混凝土梁 预应力度 徐变系数 徐变挠度系数 数值关系 有限元法 

分 类 号：TU378.1[建筑科学—结构工程]