考虑钢束腐蚀的PC连续刚构桥寿命周期内性能分析

PC continuous rigid frame bridge performance over the whole of the degradation process analysis

通过分析钢绞线的锈蚀机理和性能,在已有研究基础上,建立氯盐侵蚀下考虑钢束腐蚀的预应力构件性能预测模型.对PC连续刚构桥进行寿命周期性能分析,预测钢绞线的腐蚀量和性能退化,分析寿命周期内应力状态与承载性能的演变规律.结果表明,结构抗弯承载力与抗裂性能退化明显,而抗剪承载力和抗压性能仍能达到规范要求.

The performance prediction models of PC beam under chloride erosion is proposed,by analyzing the corrosion mechanism and performance. The life cycle performance of a PC continuous rigid frame bridge is analyzed,the amount of corrosion strand and performance degradation is forecasted,the evolution of life cycle stress and bearing performance is researched. The results showed that the bending and crack resistance of concrete girders degraded significantly,while the main beam shear and compressive performance still meet regulatory requirements.