重复拉伸荷载下锈蚀钢筋力学性能及本构关系研究

通过锈蚀钢筋重复拉伸荷载试验,分析了重复拉伸荷载作用下锈蚀对钢筋力学性能的影响,并建立了锈蚀钢筋本构关系模型.试验表明,重复荷载作用下,随着锈蚀率的增大,钢筋力学性能退化,变形能力下降,屈服平台逐渐缩短甚至消失;耗能性能降低,破坏时更加表现为脆性断裂,使得结构在地震发生时更易出现脆性破坏,甚至突然倒塌.基于试验成果本文建立了锈蚀钢筋应力-应变本构关系模型,研究成果可为锈损结构耐久性、残余承载力及抗震性能评估提供技术依据.

Study on Mechanical Property and Constitutive Relation of Corroded Steel Bars under Tension Cyclic Loading

Through experiments of corroded steel bar specimens under cycling tensile load, the effect of corrosion on mechanical property was analyzed. It's revealed that the mechanical properties and deformability decrease gradually, the yielding plateau gradually shortens or even disappears, energy-dissipation capacity decreases, which makes the anti-seismic performance of structure degenerate, even sudden collapse can happen more easily in earthquakes. Based on the test results, the constitutive model for stress-strain relationship of corroded steel bars was established, which can be used as a reference to the appraisal for residual bearing capacity, durability and seismic behavior of reinforced concrete structure for the future.