码头钢筋混凝土桩的细观损伤模型参数标定及模型验证

Mesoscopic damage model of wharf reinforced concrete pile parameter calibration and model validation

桩被用于码头中时,由于各种因素对桩身材料特性的劣化而降低桩身承载能力已成为高桩码头安全健康使用的重要影响因素。为更加准确地预测钢筋混凝土桩在内河码头复杂水工环境下(船舶荷载、波浪荷载等)的损伤情况和变形特性,设计出一种易于制作与操作的水平加载装置,对钢筋混凝土桩进行水平分级加载试验,得到桩底受拉荷载-应变曲线,通过PFC3D软件建立三维颗粒流离散元钢筋混凝土桩模型,对细观参数进行标定,并结合物理试验结果验证模型力学性能的合理性。

When the pile is used in the wharf,the reduction of the bearing capacity of the pile due to the deterioration of various factors on the material characteristics of the pile has become an important influencing factor for the safe and healthy use of the high-piled wharf.In order to more accurately predict the damage and deformation characteristics of reinforced concrete piles in the complex hydraulic environment(ship load,wave load,etc.)of inland wharves,we design a horizontal loading device that is easy to make and operate to carry out horizontal graded loading tests on reinforced concrete pile,obtain the tensile load-strain curve at the bottom of the pile,and build a three-dimensional particle flow discrete element reinforced concrete pile model by PFC3D software.Then we calibrate micro-parameters of the model,and verify the rationality of mechanical properties of the model by results of physical tests.