| 引用本文: | 黄福云,李岚,何凌峰,胡晨曦.整体式桥台-RC桩-土体系受力性能[J].哈尔滨工业大学学报,2023,55(3):128.DOI:10.11918/202108020 |
| HUANG Fuyun,LI Lan,HE Lingfeng,HU Chenxi.Mechanical behavior of abutment-RC pile-soil structure in integral abutment bridges[J].Journal of Harbin Institute of Technology,2023,55(3):128.DOI:10.11918/202108020 |
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| 整体式桥台-RC桩-土体系受力性能 |
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黄福云1,2,李岚1,2,何凌峰1,2,胡晨曦1,2
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(1.福州大学 土木工程学院 ,福州 350108;2.福建省土木工程多灾害防治重点实验室(福州大学),福州 350108)
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| 摘要: |
| 为了探究整体式桥台-RC桩-土体系的力学性能,以国内某整体桥为背景,设计并制作了4个不同桩基配筋率和截面形状的整体式桥台-RC桩模型,并开展整体式桥台-RC桩-土相互作用低周往复荷载拟静力试验研究,主要研究RC桩配筋率与截面形状对桥台-RC桩-土体系受力性能的影响,并分析台后土抗力、桩侧土抗力、桩身应变与桩身弯矩的分布规律等。结果表明:在桥台往复位移作用下,距离台背较近处土抗力沿高度方向的分布规律会由“三角形”分布向“抛物线形”分布转变；距离台背较远处的基本呈“三角形”分布；台后土抗力会受到RC桩配筋率和截面形状的影响,提高RC桩的配筋率或采用矩形截面可增大整体式桥台-RC桩-土体系的整体性；桩身累积变形会影响桩侧土抗力的分布规律,使桩后侧土抗力减小、桩前侧土抗力增大；采用配筋率更大或矩形截面RC桩的试件更不易受累积变形的影响,桥台-桩基-土体系整体性更好；整体式桥台-RC桩在向河跨侧挤压前侧土体运动时,桩身应变和弯矩的分布规律与传统桩基一致；向岸坡侧挤压后侧土体运动时,桩身最大应变和弯矩出现在台底与桩顶连接处。提高RC桩配筋率或采用矩形截面RC桩可有效减小桩身应变和弯矩,改善RC桩基的受力性能。 |
| 关键词: 整体桥 拟静力试验 桥台-桩基-土相互作用 RC桩 配筋率 截面形状 受力性能 |
| DOI：10.11918/202108020 |
| 分类号:U443.15+7 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51578161)； 天津大学-福州大学自主创新基金合作项目(TF2022-8); 福建省住建行业建设科技研究开发资助 (2022-K-6) |
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| Mechanical behavior of abutment-RC pile-soil structure in integral abutment bridges |
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HUANG Fuyun1,2,LI Lan1,2,HE Lingfeng1,2,HU Chenxi1,2
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（1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China; 2. Fujian Provincial Key Laboratory on Multi-disasters Prevention and Mitigation in Civil Engineering (Fuzhou University), Fuzhou 350108, China）
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| Abstract: |
| To explore the mechanical properties of integral abutment-RC pile-soil structure, we designed and prefabricated four integral abutment-RC pile models with different pile foundation reinforcement ratios and cross-section shapes taking an integral abutment bridge in China as background. The quasi-static test of integral abutment-RC pile-soil interaction under low cyclic loading was carried out. The effects of reinforcement ratio and cross-section shape of RC pile on the mechanical properties of abutment-RC pile-soil system were mainly studied, and the soil resistance behind abutment, the soil resistance beside pile, and the distribution of pile strain and bending moment were analyzed. Results show that under the action of cyclic displacement of abutment, the distribution of soil resistance near the abutment back along the height direction changed from “triangular” distribution to “parabolic” distribution, and that away from the back of the abutment was basically in “triangular” distribution. The resistance of soil behind abutment was affected by the reinforcement ratio and section shape of RC pile, so it is necessary to increase the reinforcement ratio of RC pile or use rectangular section to improve the integrity of integral abutment-RC pile-soil system. The cumulative deformation of pile affected the distribution of soil resistance on the sides of pile, which reduced the soil resistance behind pile and increased the soil resistance in front of pile. The specimens with larger reinforcement ratio or rectangular cross-sectional RC piles were less affected by the cumulative deformation, and the integrity of abutment-pile foundation-soil structure was better. When the integral abutment-RC pile structure moved to the river span side, the distribution of pile strain and bending moment was consistent with that of traditional pile foundation. When moving to the riverbank, the maximum strain and bending moment of pile appeared at the joint between the bottom of abutment and the top of pile. Increasing the reinforcement ratio of RC pile or adopting rectangular cross-sectional RC pile can effectively reduce the strain and bending moment of pile body and improve the mechanical performance of RC pile foundation. |
| Key words: integral abutment bridge quasi-static test abutment-pile-soil interaction RC pile reinforcement ratio cross-section shape mechanical behavior |
