C80以上高强混凝土梁受力性能研究综述及建议

REVIEW AND SUGGESTION OF STUDIES ON MECHANICAL BEHAVIOR OF HIGH STRENGTH CONCRETE BEAM ABOVE C80

从钢筋强度、承载力、构造要求、正常使用极限状态及在装配式结构中的应用等方面,综述C80以上高强混凝土梁受力性能的研究情况,主要结论和建议为:国内对斜截面受剪承载力的研究较多,建议进一步研究大剪跨比、小配筋率、高截面情况下的受剪性能;鉴于国内缺少对梁延性构造要求的研究,建议通过试验研究最大配筋率和最大混凝土受压区高度;梁的长期变形与短期变形之比比普通混凝土梁小;建议结合混凝土构造及配筋形式、连接构造等进行预制梁的受力性能研究。

Based on the aspects of reinforcement strength,load carrying capacity,detailing requirement,serviceability limit state and application in precast structure,the studies on mechanical behavior of high strength concrete beam above C80 and the application of high strength concrete in precast concrete structures have been reviewed.The main conclusions and suggestions are as follows.Domestic studies focus more on shear capacity,it is need to study the shear behavior of beams with large shear span ratio,small reinforcement ratio or big section height further.Domestic studies lack the aspect of ductility detailing requirement of beam,it is suggested to study the maximum reinforcement ratio and concrete compression zone height.The ratio of long-term deformation to short-term deformation is smaller than normal concrete beam.It is suggested to study the mechanical behavior of precast beam considering the detailing of concrete and reinforcement arrangement and connection joint.