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基于全寿命的桥梁结构设计和基于性能的桥梁抗震设计是目前的研究热点。该文以一多跨钢筋混凝土连续梁桥为例,建立非线性动力分析模型,考虑氯离子侵蚀效应的影响,结合以上两个研究热点,建立了钢筋和混凝土的直径及屈服强度退化模型;并建立了结构的有限元动力分析模型,输入典型地震波进行非线性时程分析。分析结果表明:当考虑氯离子侵蚀时,箍筋锈蚀比纵筋锈蚀更早;在地震动输入下,结构的地震响应随桥梁的服役时间逐渐增加;在以后的桥梁设计中应该引起重视。
Bridge structure design and performance-based seismic design of bridges based on the whole life are the current research hotspots. Taking a multi-span reinforced concrete continuous girder bridge as an example, a nonlinear dynamic analysis model is established to consider the effect of chloride ion erosion. Combined with the above two research hotspots, the degradation models of the diameter and yield strength of reinforced concrete and concrete are established. The finite element dynamic analysis model of the structure is established, and the typical seismic waves are input for nonlinear time history analysis. The results show that the corrosion of stirrup is earlier than that of longitudinal reinforcement when chloride ion erosion is considered. Under the input of ground motion, the seismic response of the structure increases with the service life of the bridge, and should be paid more attention in the future bridge design.