现代交通技术
現代交通技術
현대교통기술
XIANDAI JIAOTONG JISHU
2012年
3期
26-29
,共4页
桥梁工程%底板线形%纵向开裂%预应力
橋樑工程%底闆線形%縱嚮開裂%預應力
교량공정%저판선형%종향개렬%예응력
bridge engineering%line type of bottom slab%longitudinal cracking%pre-stressing
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。
對混凝土箱樑橋在閤龍束作用下可能產生的底闆縱嚮開裂現象進行瞭分析。從理論層麵闡述瞭這種現象的力學機理。同時以1座預應力混凝土連續樑橋和1座預應力混凝土連續剛構橋為例,通過改變其底闆線形,分析不同底闆線形的底闆受力情況,提齣瞭避免跨中箱樑底闆縱嚮開裂的建議,為類似橋樑設計提供參攷。
대혼응토상량교재합룡속작용하가능산생적저판종향개렬현상진행료분석。종이론층면천술료저충현상적역학궤리。동시이1좌예응력혼응토련속량교화1좌예응력혼응토련속강구교위례,통과개변기저판선형,분석불동저판선형적저판수력정황,제출료피면과중상량저판종향개렬적건의,위유사교량설계제공삼고。
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.