摘要
对混凝土箱梁桥在合龙束作用下可能产生的底板纵向开裂现象进行了分析,从理论层面阐述了这种现象的力学机理。同时以1座预应力混凝土连续梁桥和1座预应力混凝土连续刚构桥为例,通过改变其底板线形,分析不同底板线形的底板受力情况,提出了避免跨中箱梁底板纵向开裂的建议,为类似桥梁设计提供参考。
This paper analyzes the effect of longitudinal cracking on the bottom slab induced by closure tendon in concrete box girder. Firstly, the mechanism of this phenomenon on the basis of theory is expounded, then stress state of bottom slab with different line types is studyed based on a pre-stressing continuous concrete bridge and a pre- stressing continuous concrete rigid-frame bridge. Finally, suggestions on avoiding the longitudinal cracks on the bottom slab in the mid-span are put forward,which can be a useful reference to the design of similar bridges.
出处
《现代交通技术》
2012年第3期26-29,共4页
Modern Transportation Technology
关键词
桥梁工程
底板线形
纵向开裂
预应力
bridge engineering
line type of bottom slab
longitudinal cracking
pre-stressing
