多环境腐蚀作用下钢筋混凝土梁疲劳损伤模型

发布时间：2018-04-29 11:57

本文选题：钢筋混凝土梁 + 杂散电流　；参考：《铁道学报》2014年07期

【摘要】：地铁、轻轨等城市轨道交通混凝土结构常处在杂散电流、氯离子与疲劳荷载共同作用下服役。针对这种典型服役条件下钢筋混凝土疲劳损伤行为,开展了30V杂散电流与3.5%氯离子多环境腐蚀作用下钢筋混凝土梁四点弯曲疲劳试验研究。基于弯曲疲劳模量退化,建立用于这种典型服役条件下钢筋混凝土梁的非线性疲劳寿命预测和疲劳累积损伤模型。研究结果表明:杂散电流和氯离子多环境腐蚀对钢筋混凝土梁疲劳损伤影响显著,且疲劳荷载越大影响越大。损伤过程分初始损伤、累积损伤和失效破坏等3个阶段,破坏时无征兆。本文所建立的非线性疲劳损伤模型可描述这一损伤演化趋势,预测结果与实测值吻合较好。
[Abstract]:The concrete structures of urban rail transit such as subway and light rail are often in service under stray current, chloride ion and fatigue load. In view of the fatigue damage behavior of reinforced concrete under this typical service condition, a four-point bending fatigue test of reinforced concrete beams under the action of 30V stray current and 3.5% chloride multi-environment corrosion was carried out. Based on the degradation of flexural fatigue modulus, the nonlinear fatigue life prediction and fatigue cumulative damage model of reinforced concrete beams under these typical service conditions are established. The results show that the influence of stray current and chloride multi-environment corrosion on fatigue damage of reinforced concrete beams is significant, and the greater the fatigue load is, the greater the influence is. The damage process consists of three stages: initial damage, cumulative damage and failure failure. The nonlinear fatigue damage model established in this paper can describe the damage evolution trend and the predicted results are in good agreement with the measured values.
【作者单位】：华东交通大学土木建筑学院;
【基金】：国家重点基础研究发展计划(973计划)(2009CB623200) 国家自然科学基金(51002050,50968006) 江西省重点科技支撑计划(2009BGA00500)
【分类号】：TU375.1

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