钢-混组合梁桥负弯矩区裂缝控制研究综述

Review on Crack Control in Hogging Moment Zone of Steel-Concrete Composite Girder Bridge

钢-混组合连续梁桥负弯矩区存在混凝土板受拉、钢梁受压的不利区域。尤其是混凝土板的开裂会造成钢筋锈蚀、刚度降低的严重问题。为保障组合结构桥梁的安全与耐久性,在钢-混组合连续桥梁的设计与施工中,需对组合梁负弯矩区混凝土板的裂缝进行控制。文中从组合梁桥负弯矩区混凝土板的开裂机理,裂缝宽度影响因素以及裂缝控制措施三方面进行综述。希望能对组合梁桥负弯矩区混凝土的裂缝控制有所帮助。

In the negative moment region of steel-concrete composite continuous beam bridge,there are unfavorable regions of concrete slab tension and steel beam compression.Especially the cracking of concrete slab will cause serious problems of steel corrosion and stiffness reduction.Therefore,in order to ensure the safety and durability of composite structure bridge,it is necessary to control the crack width of concrete slab in negative moment area in the design and construction of steel-concrete composite continuous bridge.In the past,many researches have focused on concrete crack control.In this paper,the cracking mechanism of concrete slab in negative moment area of composite girder bridge,the influencing factors of crack width and the control of crack are summarized.Hope to be helpful to the control of composite beam cracks.