先张法折线预应力混凝土双T 形梁试验及应用

Test&Application of Pretensioned Broken Line Prestressed Concrete Double T-Shaped Beam

由于目前中、小跨径桥梁中广泛采用的空心板梁预制不便,维修、保养困难的缺点,所以研发出一种新型先张法折线预应力混凝土双T形梁。开口断面便于预制、维修与养护,故采用折线预应力减小截面主拉应力。为验证新型双T形梁的结构性能,开展足尺模型构件的弯剪耦合性能试验。结果表明,在弯剪耦合工况下,其正、斜截面抗裂性能及承载力均满足规范要求。

Due to the disadvantages of inconvenient prefabrication,difficult maintenance&repairing of hollow slab beams widely used in bridges with medium&small spans,a new type of pretensioned prestressed concrete double T-shaped beam is developed.The open section is convenient for prefabrication,maintenance&repairing,so the broken line prestress is used to reduce the main tensile stress of the section.To verify the structural performance of the new double T-shaped beam,the bending-shear coupling performance test of the full-scale model member is carried out.The results show that the crack resistance&bearing capacity of the normal&oblique sections meet the requirements of the specification under the bending-shear coupling condition.