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(1 廣東省建科建筑設(shè)計院有限公司, 廣州 510010; 2 廣東工業(yè)大學土木與交通工程學院,廣州 510006; 3 墨爾本大學基礎(chǔ)設(shè)施工程學院, 帕克維爾維多利亞 VIC 3010)
摘要: 為研究水平荷載作用下預應(yīng)力高強混凝土管樁的動力響應(yīng)和破壞模式,采用超高落錘沖擊試驗裝置對 4根預應(yīng)力高強混凝土管樁(PHC 管樁)進行沖擊試驗并使用 ABAQUS 進行數(shù)值模擬,測得不同沖擊高度下落錘的沖擊速度、沖擊力時程曲線及試件沖擊區(qū)側(cè)面處位移時程曲線,并獲取試件的破壞形態(tài)。 結(jié)果表明:該模型能較好地模擬 PHC 管樁動力響應(yīng)及破壞形態(tài)。 基于該模型的可靠性,在 PHC 管樁內(nèi)填充 C30 混凝土并配置鋼筋進行沖擊模擬。 研究表明:PHC 管樁在低速沖擊作用下具有較好的彈性恢復能力;當 PHC 管樁局部受到 2 次大于 15km/ h的沖擊荷載時,將在沖擊區(qū)發(fā)生局部沖切破壞;當 PHC 管樁受到 2 次累計沖擊荷載時,第 2 次撞擊較首次抗沖擊性能減弱;灌芯后的 PHC 管樁抗沖擊性能較 PHC 管樁增強。
關(guān)鍵詞: 預應(yīng)力高強混凝土管樁; 抗沖擊性能; 動力響應(yīng); 彈性恢復能力; 沖擊力時程曲線
中圖分類號:TU560 文獻標志碼:A 文章編號:1002-848X(2022)24-0114-06
DOI:10. 19701 / j. jzjg. LS210278
Research on performance of prestressed high-strength concrete pipe piles under lateral impacts
KUANG Mengfang1,2, XU Caiwei1,3, XU Qigong1,2, CAO Huaxian2, YANG Xueqiang2, DONG Pengcheng2
(1 Guangdong Jianke Architectural Design Institute Co. , Ltd. , Guangzhou 510010, China; 2 College of CivilEngineering and Transportation, Guangdong University of Technology, Guangzhou 510006, China; 3 Department ofInfrastructure Engineering, University of Melbourne, Parkville Victoria VIC 3010, Australia)
Abstract: In order to study the dynamic response and failure mode of prestressed high-strength concrete pipe piles underhorizontal load, four prestressed high-strength concrete pipe piles (PHC pipe piles) were tested experimentally by a superhigh drop hammer impact testing device and simulated numerically by ABAQUS. The impact velocity, impact force-timecurve and displacement-time curve at the side of the impact area of the specimen were measured for different impact heightsof the falling hammer, and the damage pattern of the specimen was obtained. The results show that the model can simulatethe dynamic response and failure mode of PHC pipe piles approximately. Based on the reliability of the model, a PHC pipepile filled with concrete with a grade of compressive strength of C30 and reinforced with steel bars for impact simulation.The results show that PHC pipe piles can recover to the elastic stage after impacted by a low speed; when PHC pipe pilesare locally impacted by a speed more than 15km/ h twice, local punching failure occurs in the impacted area; when PHCpipe piles are subjected to cumulative impact loads twice, the impact capacity of the second impact is lower than that of thefirst impact; the impact capacity of the PHC pipe pile after grouting is higher than that of the PHC pipe pile.
Keywords:prestressed high-strength concrete pipe pile; impact resistance; dynamic response; resilient recovery capacity;impact force-time curve
第一作者:鄺夢芳,碩士,主要從事裝配式研究,Email:403689249@ qq. com。
[引用本文] 鄺夢芳,徐采薇,徐其功,等. 預應(yīng)力高強混凝土管樁抗側(cè)向沖擊性能研究[ J]. 建筑結(jié)構(gòu),2022,52(24):114-119, 130. KUANG Mengfang,XU Caiwei,XU Qigong, et al. Research on performance of prestressed highstrength concrete pipe piles under lateral impacts[J]. Building Structure,2022,52(24):114-119,130.
