| 整体式桥台-H形钢桩基-土相互作用水平变形机理研究 |
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| 引用本文： | 黄福云,单玉麟,何凌峰,陈伟.整体式桥台-H形钢桩基-土相互作用水平变形机理研究[J].中国公路学报,2022,35(5):84-94. |
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| 作者姓名： | 黄福云 单玉麟 何凌峰 陈伟 |
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| 作者单位： | 1. 福州大学土木工程学院, 福建 福州 350108;2. 福州大学福建省土木 工程多灾害防治重点实验室, 福建 福州 350108 |
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| 基金项目： | 国家自然科学基金项目(51578161);四川省交通科技项目(2020-A-05);福建省住建行业建设科技研究开发项目(2022-K-6) |
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| 摘 要： | 整体桥因整体性、抗震性、行车舒适性而被广泛应用。为了能吸纳整体桥在温度、地震作用下的水平往复变形，实际工程中其桩基主要采用H形钢桩。为深入研究整体桥H形钢桩基水平变形机理，以某整体桥为背景，开展了传统平衡土压力状态下H形钢桩-土、台后不平衡土压力下的H形钢桩-土以及整体式桥台-H形钢桩-土相互作用拟静力试验研究，分析对比了H形钢桩桩身水平变形规律，滞回、耗能和骨架曲线。试验研究表明，不平衡土压力对桩身水平变形影响较大。正负向加载时，HP模型桩身水平变形较为对称，变形规律为沿埋深方向逐渐减小，接着反向增大后减小至桩底为0。对于UHP模型，正负向加载时的桩身变形不对称，其中正向加载时的变形规律为沿埋深方向逐渐减小至0，接着反向增大至最大后减小；负向加载时的变形规律则与HP模型基本相似。AHP模型桩身水平变形规律则较为复杂，其变形介于HP模型和UHP模型之间。研究还表明：HP模型的滞回曲线较为饱满和对称,而AHP模型的滞回曲线存在显著的非对称;AHP模型的承载力和耗能能力最高，但延性最低。
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| 关 键 词： | 桥梁工程 整体桥 拟静力试验 不平衡土压力 结构-土相互作用 水平变形 |
| 收稿时间： | 2020-08-02 |
Horizontal Deformation Mechanism of Soil-steel H-pile Interaction in Integral Abutment Jointless Bridges (IAJBs) |
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| HUANG Fu-yun,SHAN Yu-lin,HE Ling-feng,CHEN Wei.Horizontal Deformation Mechanism of Soil-steel H-pile Interaction in Integral Abutment Jointless Bridges (IAJBs)[J].China Journal of Highway and Transport,2022,35(5):84-94. |
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| Authors: | HUANG Fu-yun SHAN Yu-lin HE Ling-feng CHEN Wei |
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| Affiliation: | 1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China;2. Fujian Provincial Key Laboratory on Multi-disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China |
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| Abstract: | Integral abutment jointless bridges (IAJBs) with high integrity, favorable seismic performance, and comfortable driving have been widely used worldwide. Steel H-piles have usually been applied in practical engineering to absorb the horizontal reciprocating deformation induced by the effects of ambient temperature or earthquakes. In order to further study the mechanism of interaction of soil-steel H-piles in IAJBs, several reciprocating low-cycle pseudo-static tests on the interaction of soil-steel H-piles under balanced earth pressure, soil-steel H-piles and soil-abutment-piles under unbalanced earth pressure were carried out under horizontal displacement loading based on a practical IAJB. A comparative study was performed to determine their behaviors in terms of the horizontal deformation law, hysteretic curves, energy dissipation and skeleton curves. The test results indicate that the unbalanced earth pressure significantly affects the horizontal deformation of the pile. The horizontal deformation of the HP specimen is basically symmetric under positive and negative loading. Its horizontal deformation gradually decreases along the buried pile depth, then increases in reverse, and finally decreases to zero at the bottom of the pile. For the UHP model, the horizontal deformation is asymmetric. Under positive loading, the horizontal deformation gradually decreases along the buried pile depth, then increases to a maximum in reverse, and finally decreases along the buried pile depth. The law of horizontal deformation is similar to that of the HP model under negative loading. However, the horizontal deformation law of the AHP model is more complex. The horizontal deformation is between the HP model and the UHP model. The test results also indicate that the hysteretic curves of the HP model are plump and symmetrical. The hysteretic curve of the AHP model is significantly asymmetrical. In addition, the bearing and energy dissipation capacities of the AHP model are the highest, whereas the ductility is the lowest. |
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| Keywords: | bridge engineering integral abutment jointless bridges (IAJBs) pseudo-static low cycle test unbalanced earth pressure soil-structure interaction horizontal deformation |
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