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(1 中國(guó)能源建設(shè)集團(tuán)江蘇電力設(shè)計(jì)院有限公司, 南京 211102; 2 沈陽(yáng)建筑大學(xué)交通工程學(xué)院,沈陽(yáng) 110168; 3 浙江大學(xué)交通工程研究所, 杭州 310058)

摘要: 為研究新型鋼管插入式基礎(chǔ)的錨固機(jī)理與承載性能,通過(guò)鋼管與混凝土的粘結(jié)錨固性能試驗(yàn),基于粘聚帶界面接觸本構(gòu)和混凝土損傷塑性模型,采用非線性有限元方法,探討了錨板的數(shù)量、位置和間距對(duì)基礎(chǔ)損傷破壞模式和承載性能的影響. 首先通過(guò)有限元結(jié)果與試驗(yàn)結(jié)果對(duì)比,驗(yàn)證了模型和方法的有效性與準(zhǔn)確性;然后利用實(shí)際工程的等比例模型,對(duì)鋼管插入式基礎(chǔ)的荷載-位移曲線、損傷因子分布及錨板的應(yīng)力分布系統(tǒng)地分析. 結(jié)果表明:基礎(chǔ)抗拔承載力與錨板的數(shù)量及位置有關(guān),雙錨板承載能力大于單錨板;單錨板最佳位置為距離鋼管頂部 1m處,雙錨板抗拔承載力隨錨板間距增加先增大后減小,雙錨板間的最佳間距為 0. 8m;從損傷的發(fā)展和裂縫控制的角度,可以設(shè)置“小而多”的錨板.

關(guān)鍵詞: 鋼管插入式基礎(chǔ); 粘結(jié)錨固性能試驗(yàn); 損傷破壞模式; 粘聚帶界面接觸本構(gòu)模型; 混凝土損傷塑性模型

中圖分類號(hào):TU470 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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

∗國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973 計(jì)劃)(2015CB057801),遼寧省自然科學(xué)基金(2018011666-301).

第一作者:余亮,碩士,高級(jí)工程師,主要從事輸電線路設(shè)計(jì)工作,Email:yuliang@ jspdi. com. cn.

[引用本文] 余亮,朱軼,陶青松,等. 鋼管插入式基礎(chǔ)錨固機(jī)理與承載性能研究[ J]. 建筑結(jié)構(gòu),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.