(1 中国能源建设集团江苏电力设计院有限公司, 南京 211102; 2 沈阳建筑大学交通工程学院,沈阳 110168; 3 浙江大学交通工程研究所, 杭州 310058)

摘要: 为研究新型钢管插入式基础的锚固机理与承载性能,通过钢管与混凝土的粘结锚固性能试验,基于粘聚带界面接触本构和混凝土损伤塑性模型,采用非线性有限元方法,探讨了锚板的数量、位置和间距对基础损伤破坏模式和承载性能的影响. 首先通过有限元结果与试验结果对比,验证了模型和方法的有效性与准确性;然后利用实际工程的等比例模型,对钢管插入式基础的荷载-位移曲线、损伤因子分布及锚板的应力分布系统地分析. 结果表明:基础抗拔承载力与锚板的数量及位置有关,双锚板承载能力大于单锚板;单锚板最佳位置为距离钢管顶部 1m处,双锚板抗拔承载力随锚板间距增加先增大后减小,双锚板间的最佳间距为 0. 8m;从损伤的发展和裂缝控制的角度,可以设置“小而多”的锚板.

关键词: 钢管插入式基础; 粘结锚固性能试验; 损伤破坏模式; 粘聚带界面接触本构模型; 混凝土损伤塑性模型

中图分类号:TU470 文献标志码:A 文章编号:1002-848X(2023)12-0126-06

DOI:10. 19701 / j. jzjg. LS210222

Study on anchoring mechanism and load-bearing performances of steel-tube-inserted foundation

YU Liang1, ZHU Yi1, TAO Qingsong1, ZHANG Li2, CHENG Yao2, WANG Jinchang3

(1 Jiangsu Electric Power Design Institute Co. , Ltd. , China Energy Engineering Group, Nanjing 211102,China; 2 School of Transportation Engineering, Shenyang Jianzhu University, Shenyang 110168, China; 3 Instituteof Transportation Engineering, Zhejiang University, Hangzhou 310058, China)

Abstract: To study the anchoring mechanism and load-bearing performance of the new type steel-tube-inserted foundation,through the bond and anchorage performance test of steel tube and concrete, based on the cohesive zone interface contactconstitutive model and concrete damage plasticity model, the effects of the number of the anchor plates, the initial positionand the spacing of the anchor plates on the damage mode and bearing capacity of foundation were discussed by using thenonlinear finite element method. Firstly, the validity and accuracy of the model and method were verified by comparing thefinite element results with the experimental results. Then, the load-displacement curve, the damage factor distribution andthe stress distribution of anchor plates were systematically analyzed by using the same scale model of an actual project. Theresults show that the uplift bearing capacity of the foundation is related to the number and position of anchor plates, and thebearing capacity of double anchor plates is greater than that of single anchor plate. The best position of single anchor plateis 1m from the top of steel tube. The distance between plates increases first and then decreases, and the optimal distancebetween double anchor plates is 0. 8m. From the perspective of damage development and crack control, " small but many"anchor plates can be installed.

Keywords:steel-tube-inserted foundation; bond and anchorage performance test; damage and failure mode; cohesive zoneinterface contact constitutive model; concrete damaged plasticity model

∗国家重点基础研究发展计划(973 计划)(2015CB057801),辽宁省自然科学基金(2018011666-301).

第一作者:余亮,硕士,高级工程师,主要从事输电线路设计工作,Email:yuliang@ jspdi. com. cn.

[引用本文] 余亮,朱轶,陶青松,等. 钢管插入式基础锚固机理与承载性能研究[ J]. 建筑结构,2023,53(12):126-131,143. YU Liang,ZHU Yi,TAO Qingsong,et al. Study on anchoring mechanism and load-bearing performances ofsteel-tube-inserted foundation[J]. Building Structure,2023,53(12):126-131,143.