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微型抗滑桩极限抗弯承载力试验研究
陈再谦1, 帅世杰1, 蒲黍絛1, 张丽华1, 饶军应2
1.中国电建集团贵阳勘测设计研究院有限公司 贵阳 550081;2.贵州大学 土木工程学院, 贵阳 550025
摘要:
对桩心配筋桩、钢管+桩心配筋桩和钢管+H型钢桩共27根试件进行极限抗弯承载力试验,发现桩心配筋桩极限抗弯承载力较低且为脆性破坏,钢管+桩心配筋桩和钢管+H型钢桩表现出较高的极限抗弯承载力和延性性能。对桩心配筋桩、钢管+桩心配筋桩和钢管+H型钢桩荷载位移曲线进行分析,将桩心配筋桩受荷分为试件咬合阶段、弹性阶段、弹塑性阶段和破坏阶段,将钢管+桩心配筋桩和钢管+H型钢桩分为试件咬合阶段、弹性阶段、弹塑性阶段和强化阶段。钢管+桩心配筋桩极限抗弯承载力计算可用钢管混凝土桩极限抗弯承载力乘以1.2的提高系数计算。
关键词:  桩心配筋桩  钢管+桩心配筋桩  钢管+H型钢桩  极限抗弯承载力  荷载位移曲线
DOI:10.11835/j.issn.2096-6717.2019.095
分类号:TU758.11
基金项目:国家自然科学基金(51608141)
Study on the ultimate flexural bearing capacityof micro anti-slide piles
Chen Zaiqian1, Shuai Shijie1, Pu Shutao1, Zhang Lihua1, Rao Junying2
1.Power China Guiyang Engineering Co., Ltd. Guiyang Guizhou 550081, P. R. China;2.College of Civil Engineering, Guizhou University, Guiyang Guizhou 550025, P. R. China
Abstract:
The ultimate flexural bearing capacity test was carried out through a total of 27 root specimen of the heart reinforcement pile, the steel pipe + heart reinforcement pile, the steel pipe + H section steel pile. It wasfound that the heart reinforcement pile ultimate flexural bearing capacity is low and that the failure was of brittle type, while the steel pipe + heart reinforcement pile and the steel pipe + H section steel pile show a higher bearing capacity and was of better ductility performance. Through the load-displacement curve, the heart reinforcement ile under loading is divided into specimen bite stage, elastic stage, elastic-plastic stage and failure stage, while the steel pipe + heart reinforcement pile and the steel pipe + H section steel pile can be divided into specimen bite stage, elastic stage, elastic-plastic stage and strengthening stage. The ultimate flexural bearing capacity for steel pipe + heart reinforcement pile can be regarded as that of steel pipe concrete pile multiplied by an increase coefficient of 1.2.
Key words:  heart of pile reinforcement of pile  steel pipe + heart reinforcement pile  steel pipe + H section steel pile  ultimate flexural bearing capacity  load-displacement curve
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