赵玉红,赵文达,闫秋实
ZHAO Yu-hong,ZHAO Wen-da,YAN Qiu-shi

• 1:北京工业大学城市建设学部

摘要(Abstract)：

为了研究水下爆炸荷载作用下重力式沉箱码头的动力响应及其损伤评估，基于Coupled Lagrangian Eulerian算法，通过AUTODYN建立了一维自由场冲击波、气泡脉动数值模型，验证了数值计算的合理性；将突堤式沉箱码头数值计算结果与试验数据进行对比分析，验证了数值分析模型的可靠性；建立了典型重力式沉箱码头在爆炸荷载作用下的三维数值模型，并分析了不同炸药当量、混凝土强度、配筋率等条件下，重力式沉箱码头的动力响应及损伤破坏。结果表明：随着装药量的增大，峰值位移逐渐增大，且增大的幅度与速度有所提高；结构配筋率主要影响重力式沉箱码头的抗剪性能，在水下爆炸荷载作用下，提高结构配筋率、混凝土强度能够优化整体结构的抗爆性能。研究成果可以为我国重力式沉箱码头结构在水下爆炸荷载作用下抗爆设计及防护措施提供参考。
In order to study the dynamic response and assess the damage of gravity caisson wharfs under underwater explosion, a one-dimensional free-field numerical model of shock waves and bubble fluctuation is established by AUTODYN based on the Coupled Lagrangian Eulerian algorithm, and the rationality of the numerical calculation is verified. The reliability of the numerical analysis model is verified by comparing the numerical results with the experimental data. By establishing a three-dimensional numerical model of a typical gravity caisson wharf under blast loading, the dynamic response and damage analysis is carried out under different explosive equivalents, concrete strength, reinforcement ratios, etc. The results show that with the increase of the charge amount, the peak displacement value increases gradually, and the amplitude and speed of the increase grow.The results also demonstrate the structural reinforcement ratio can obviously affect the whole blast-resistant performance, and improving the concrete strength can largely improve the blast-resistant performance of the structure. The research results can be used asa reference for blast-resistant design and protection measures of gravity caisson wharf structures under underwater explosion loads.

关键词(KeyWords)： 水下爆炸;重力式沉箱码头;数值模拟;动力响应;损伤破坏
underwater explosion;gravity caisson wharf;numerical simulation;dynamic response;damage and destruction

Abstract:

Keywords:

基金项目(Foundation): 北京市自然科学基金资助项目(8182009);; 国家自然科学基金资助项目(51678018)

作者(Author): 赵玉红,赵文达,闫秋实
ZHAO Yu-hong,ZHAO Wen-da,YAN Qiu-shi

DOI: 10.19931/j.EB.20210073

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