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缓冲器对钢筋混凝土桥墩撞击性能影响的试验研究

, PP. 83-90

Keywords: 桥梁工程,撞击性能,试验分析,钢筋混凝土桥墩,缓冲器

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Abstract:

采用落锤冲击实验装置,进行钢筋混凝土桥墩模型在侧向撞击荷载下的动力性能试验,研究在桥墩模型表面设置缓冲器对试件撞击动力响应的影响。比较了不同缓冲器的缓冲效果,分析了影响桥墩模型冲击裂缝扩展和破坏模式的主要因素,研究了冲击能量和试件峰值动力响应及撞击体平均冲击力的关系。试验证明,所设置的缓冲器可以较大程度地减少构件的冲击动力响应,对撞击区受压钢筋峰值压应变可降低74.60%,受压混凝土峰值压应变可降低54.69%,受拉钢筋峰值拉应变可降低63.02%,跨中峰值位移可降低57.73%,抗开裂冲击能增加180%,撞击体的平均冲击力可降低78.59%。研究结果表明,经合理设计的缓冲器具有高效的缓冲作用,可用以提高桥墩的抗撞能力。

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