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| 模拟酸雨腐蚀预应力混凝土T梁重载交通疲劳性能研究 |
| Experimental study on fatigue performance of prestressed concrete T-beams under heavy load traffic and simulated acid rain corrosion environment |
| 投稿时间：2023-04-18 修订日期：2023-07-11 |
| DOI： |
| 中文关键词: 重载交通 预应力混凝土梁 酸雨腐蚀 等幅疲劳试验 疲劳寿命 |
| 英文关键词:heavy load traffic prestressed concrete beam acid rain corrosion constant amplitude fatigue experiment fatigue life |
| 基金项目:国家自然科学基金项目；江西省自然科学基金项目；轨道交通基础设施性能监测与保障国家重点实验室资助；江西省研究生创新专项资金项目 |
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| 中文摘要: |
| 为了研究模拟酸雨腐蚀预应力混凝土T梁重载交通疲劳性能,对6根腐蚀预应力混凝土梁进行静载试验和不同疲劳上限值等幅疲劳加载试验,并采用显微镜取得了疲劳断裂钢筋的几何模型。结果表明：腐蚀预应力混凝土梁均以底部钢筋发生疲劳脆性断裂为疲劳破坏为标志；随着疲劳加载,预应力混凝土梁荷载-挠度曲线、混凝土、钢筋和钢绞线荷载-挠度曲线呈现“疏-密-疏”三段式变化；钢筋疲劳裂纹的发展规律与钢筋应变的变化相对应；腐蚀率为8%对预应力混凝土梁的疲劳寿命影响不大,疲劳上限值为0.45Pu和0.6Pu的预应力混凝土梁疲劳寿命均小于200万次。 |
| 英文摘要: |
| An experimental study was performed on the fatigue behavior of corroded six prestressed concrete T-beams under heavy load traffic conditions subjected to load with different fatigue upper limit values. Microscope was employed to obtained the geometric model of fatigue fractured reinforcement. The results show that the fatigue brittle fracture of the bottom reinforcement is the sign of fatigue failure in corroded prestressed concrete beams. With fatigue loading, the load-deflection curves of stressed concrete beams and the load-deflection curves of concrete, steel bars, and steel strands show a "sparse-dense-sparse" three-stage change. The development law of fatigue cracks in steel bars corresponds to the change of steel strain. The corrosion rate of 8% has little impact on the fatigue life of prestressed concrete beams, and the fatigue life of prestressed concrete beams with upper fatigue limit values of 0.45Pu and 0.6Pu is less than 2 million times. |
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