摘要
连续刚构桥一般都做成超静定的结构形式,因此砼收缩、徐变和温度变化等因素都会在结构内产生附加内力,因此对结构产生不利影响.介绍了大跨度预应力混凝土连续刚构桥减少营运期砼收缩徐变的新的合拢施工措施———主跨静置4个月后合拢,并用理论计算分析了该种合拢方式与常规合拢方式之间徐变影响的不同,为连续刚构桥的徐变控制提供了科学依据.
The rigid frame bridges are all constructed in the super-static style in general,therefore the factors of concrete contraction, creep, temperature change and so on can create extra innerforce in the structure, and will have the adverse effect on the structure. More attentions should be paid during designing and constructing a bridge. In this paper, a new closure method is introduced to re- duce concrete contraction and creep during the construction period of the large span PC concrete continuous rigid frame bridge, the main span is folded after being placed for four months. Meanwhile, the differences of the creep effects between the new closure method and the general one are calculated and analyzed theoretically.
出处
《长沙理工大学学报（自然科学版）》
CAS
2006年第4期39-42,共4页
Journal of Changsha University of Science and Technology:Natural Science
关键词
预应力混凝土连续刚构桥
收缩
徐变
合拢
PC concrete continuous rigid frame bridge
shrinkage
creep
closure
