基于能量原理的钢筋混凝土桥墩抗震安全系数

从能量的角度提出了桥墩抗震耗能能力安全系数的概念,通过合理给定位移和损伤控制条件并结合钢筋混凝土构件的损伤指标方程和结构地震反应的能量方程推导出了这一安全系数。最后用通用有限元软件对一实例钢筋混凝土桥墩抗震耗能能力安全系数进行了计算,验证了方法的可行性。研究结果表明:通过给定合理位移和损伤控制条件可以简便地求出桥墩的有效总耗能能力并可由此得到不同地震动输入情况下的桥墩耗能能力安全系数。对今后基于能量原理的抗震设计和评估方法的应用,具有一定的参考作用。

Antiseismic Safety Factor of the Reinforced Concrete Bridge Piers Based on the Energy Principle

The concept of the safety factor on the ability of energy dissipation of the reinforced bridge pier is put forward and deduced,based on the dynamic energy equation of multi-degree structures and the damage index of the reinforced concrete structures,which is researched under two given displacement and damage controlling conditions.In addition,a real pier is analyzed in practical to show the feasibility of the theory,where the popular software ANSYS is utilized.The results show that the real ability of energy dissipation of the reinforced bridge pier can be calculated under given displacement and damage controlling conditions and then the safety factor can be obtained subsequently in varied earthquakes.The result can be referable to the structure antiseismic design and evaluation.