摘要
系统地提出了预应力混凝土桥梁结构中钢筋对徐变和收缩时变效应的约束影响系数的概念,并给出了影响系数的计算公式,籍此提出了时变效应分析的钢筋约束影响系数法,建立了一套理论公式,可计算时变的钢筋和混凝土应力、应变及梁体竖向变形。不仅适用于静定桥梁结构,亦适用于超静定桥梁结构,可计算时变结构内力重分布。计算式物理意义明确,使用方便;理论分析与试验结果比较表明,公式具有较高的计算精度。
The concepts of restraint influence coefficient of steel on the time-dependent effects of prestressed concrete bridges due to creep and shrinkage are present systematically, and the expressions are provided. Then the steel restraint influence coefficient method to analyze time-dependent effect in prestressed concrete bridges is put forward, and a series of formulae which can calculate time-dependent stresses and strains in both concrete and steel and the deflections of bridge are introduced. This method can be used in both statically determinate system and statically indeterminate system, and to calculate time-dependent redistribution of internal force. These formulae give obvious physical meaning and are easy to use. Comparison between theoretical values and experimental results shows that the presented approach achieves higher accurary.
出处
《工程力学》
EI
CSCD
北大核心
2006年第6期120-126,共7页
Engineering Mechanics
基金
铁道部科技攻关项目(2000G048)
关键词
预应力混凝土桥梁
钢筋约束影响系数法
时变效应
徐变
收缩
prestressed concrete bridge
steel restraint influence coefficient method
time-dependent effect
creep
shrinkage
