Performance of Precast Hollow Steel-Encased High-Strength Concrete Piles
Performance of Precast Hollow Steel-Encased High-Strength Concrete Piles
复制标题
预制空心钢包裹高强混凝土桩的性能
DOI：
10.1016/j.engstruct.2019.109995
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Asai Y.
中科院分区：
文献类型：
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作者：
Thusoo S.;Kono S.;Hamada J.;Asai Y.
在日本，外包钢混凝土（SC）桩常用于抗震桩体系的开发，在桩头附近使用SC截面以增加弯矩和剪切承载力。本文主要对高强混凝土空心旋喷桩的抗弯性能进行了试验研究。共七个预制SC桩标本进行了测试，作为悬臂柱下恒定压缩轴向和准静态反向横向荷载。试验在直径400 mm、高度1.2 m的截面上进行，试验变量为轴压比（0-0.35）、钢护筒厚度（4.5-6.0 mm）、混凝土层厚度（50-68 mm）和填充材料（空心、水泥浆、混凝土）。通过OpenSees中简单纤维模型的截面分析评估理论行为。在考虑试桩极限承载力、最大承载力和极限曲率的基础上，探讨了试桩的破坏模式，以及混凝土压碎和钢护筒局部屈曲对试桩承载力的影响。
Steel-encased concrete (SC) piles are frequently used in development of earthquake resistant pile systems in Japan where SC section is used near pile head to increase moment and shear capacities. Focus of this research is on the experimental investigation of flexural performance of hollow spun SC piles made of high-strength concrete. Total of seven prefabricated SC pile specimens were tested as cantilevered columns under constant compressive axial and quasi-static reverse lateral loading. Tests were conducted on sections of diameter 400 mm and height 1.2 m with test variables as axial load ratio (0–0.35), steel casing thickness (4.5–6.0 mm), concrete layer thickness (50–68 mm) and filling material (hollow, cement paste, concrete). Theoretical behavior was assessed by sectional analysis of simple fiber model in OpenSees. The study discusses the failure modes, and influence of concrete crushing and local buckling of steel casing on moment carrying capacity of test piles while paying attention to the ultimate behavior, maximum moment capacity and ultimate curvature.