钢-混凝土双面组合连续梁截面刚度试验研究

EXPERIMENTAL STUDY ON CROSS-SECTION RIGIDITY OF DOUBLE STEEL-CONCRETE COMPOSITE CONTINUOUS BEAM

钢-混凝土组合梁是在钢结构和钢筋混凝土结构基础上发展起来的一种新型结构。当采用连续组合梁时,负弯矩区会出现钢梁受压、混凝土翼板受拉的不利情况,使混凝土桥面板因承受较大拉应力而开裂,引起钢筋及钢梁腐蚀等严重问题,影响结构的承载能力和耐久性。而双面组合梁(在传统的单面组合梁的内支座负弯矩区设置下翼缘钢筋混凝土板)能够很好地改善单面组合梁的这种不利受力状态。通过采用简化计算方法对双面组合梁截面刚度进行计算,与试验实测值进行了对比分析。

The steel-concrete composite beam is a new type of structure on the basis of steel structure and reinforced concrete structure.When it is a continuous beam the steel will be pressed and the concrete will be pulled in the negative moment areas.This is an unfavorable tress condition.The deck concrete beam will be fractured due to tension and the steel and bar will be exposed and rusted,thus the bearing capacity and endurance of the structure will be affected.But this unfavorable stress condition can be amended by double composite beams （the lower flange reinforced concrete slabs are set in the inner brackets of traditional single composite beams in negative moment areas）.The cross-section rigidity of a double steel-concrete composite beam is calculated by the simplified calculating method in this article and together with the test values are compared and analyzed.