论文部分内容阅读
长期以来,鋼筋混凝土梁的挠度問題并沒有引起人們的重視,例如我国1959年頒发的鉄路桥測設計規范就根本不提鋼筋混凝土梁的挠度标准問題。只是到了近几年来各种压低高度鋼筋混凝土梁(无碴无枕鋼筋混凝土梁、无碴有枕鋼筋混凝土梁、道碴桥面低高度鋼筋混凝土梁)的出現,挠度問題成了控制梁高度的决定性因素以后才引起了人們的重視,加上近几年来由于在鋼筋混凝土梁上出現了各种不同程度的裂縫,各单位都重視了試驗研究工作,而挠度問題也是检驗梁质量的一个重要标志,因此就引起了人們普遍的重視。 現在有些同志根据一些国內实测資料及国外資料,
For a long time, the problem of deflection of reinforced concrete beams has not attracted people’s attention. For example, the norms of design of bridge and bridge survey issued by our country in 1959 do not mention the standard of deflection of reinforced concrete beams. It is only in the last few years that the emergence of various types of high-strength reinforced concrete beams (ballastless pillowless reinforced concrete beams, ballastless reinforced concrete beams, ballastless bridge low-height reinforced concrete beams) has become the problem of the control beam height The decisive factor has aroused people’s attention afterwards. In addition, in recent years due to various degrees of cracks in the reinforced concrete beams, all units attach importance to the experimental work, and the deflection problem is also an important test of beam quality Logo, it has aroused widespread attention. Some comrades now based on some domestic survey data and foreign materials,