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  • Important Date
  • August 8, 2025

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  • August 16, 2025, morning

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[Oral Presentation]基于不连续场的既有RC梁塑性机动失效机理评估方法研究

基于不连续场的既有RC梁塑性机动失效机理评估方法研究
ID:3 View Protection:ATTENDEE Updated Time:2025-07-17 09:05:35 Hits:42 Oral Presentation

Start Time:2025-08-16 15:35 (Asia/Shanghai)

Duration:10min

Session:[S2] 8月16日下午 分会报告 » [S2-4] 分会场四

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Abstract
当前我国在役公路混凝土桥梁数量庞大,其安全服役性能受多种外部环境因素干扰。一方面,日益增多的超重车辆和潜在的地震作用等荷载作用,持续考验着既有混凝土桥梁的结构韧性;另一方面,材料老化、结构性能存在时变劣化问题,部分桥梁甚至面临严重的垮塌风险,给安全评估带来巨大挑战。为提升既有混凝土梁桥承载性能评估的准确性和效率,本报告提出了一种基于塑性理论的不连续场分析方法。该方法通过识别临界破坏裂缝和混凝土局部压溃区等关键失效部位,划分不连续线以构建混凝土梁的力流传递模型,进而研究各不连续场之间的塑性机动失效行为。该方法能够有效识别混凝土梁的破坏模式,阐明其塑性机动变位机理,为桥梁极限承载能力评估提供了一种简明的分析手段。
Keywords
混凝土桥梁;结构极限破坏;承载能力;塑性极限分析;不连续场
Speaker
雷海鹏
讲师 长安大学

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