Abstract: It is important for a bridge's safety to restriot its perpetual deformation correctly.In this paper by analysing aspects of relevant factors, the writer sets up a formula of allowable perpetual deformation of bridges.The result of study will be useful in practice.

Key words: perpetual deformation, ε⁰, restriction formula

摘要： 桥梁的永久性变形是否在容许范围内,将直接危及桥梁的安全,众多桥梁因下挠度过大而造成跨塌事故.《公桥规》对桥梁在短期荷载作用下的变形已作了具体限制,但关于桥梁的永久性变形限值却未作出明文规定.本文从材料的力学性能出发,通过各项确定因素的分.析,推导出可靠而便于应用的钢筋砼梁桥永久性变形限值公式,井列举了应用实例.该公式可望在以后桥梁实际承载能力评定的应用过程中起到一定的作用.

关键词: 永久性变形, &epsilon, ₀, 限值公式