HRB400级钢筋对梁的变形影响

Effect of HRB400Steel Bar on Deformation of Beams

根据国家标准GB50010—2002《混凝土结构设计规范》(以下称《规范》),HRB400级钢筋具有强度高,延伸性能和可焊性好等特点,所以《规范》积极推广使用HRB400级钢筋.该文从设计理论入手,并结合具体计算实例分析,及笔者多年设计工作的总结,提出:HRB400级钢筋具有强度高的特点,可节约钢材、节约资金,改善混凝土结构的性能,具有显著的经济效益和社会效益.但同时HRB400级钢筋应力高、裂缝宽度和挠度较难控制,需注意控制钢筋应力,并应对构件裂缝宽度及挠度进行验算.对于受拉或受弯构件,当承载力要求较高时,不应再采用增加钢筋用量的方法来提高承载力,而应采用施加预应力措施来提高承载力.

According to GB50010-2002 Code for RC Structure Design,HRB400steel bar is of high strength,good elongation and excellent weldability,and therefore,it's use is actively generalized by the Code.Based on the design theory,specific instances and personal experience in design work,the author believes that since it is of high strength HRB400steel can improve the property of concrete structure and save both steel and money.The use of it is of obvious economic and social effects.But as the width of cracks and deflection of beam are difficult to control due to the high stress of HRB400 steel bar,the crack and deflection of concrete beam should be checked.