地震作用下变截面钢管混凝土单桩动力响应

doi:10.3969/j.issn.1000-1565.2024.02.002

摘要/Abstract

摘要： 为了探讨桥梁位于软弱土层时,地震作用下变截面钢管混凝土桩基的动力响应,以翔安大桥为工程背景,利用FLAC3D有限元软件建立地震作用下桩-岩土体-钢管耦合作用的数值模型,研究在不同强度的地震作用下变截面钢管混凝土单桩和变截面普通混凝土单桩桩身加速度、桩身位移、桩身弯矩的动力响应差异.结果表明:变截面钢管混凝土单桩在地震作用下的桩身加速度、加速度放大系数、桩身位移最大值和桩身弯矩变化规律均同变截面普通混凝土单桩类似,但钢管使桩身加速度放大系数降低、桩基抵抗侧向变形能力和抗弯承载力提高.因此,钢管可以显著提升地震作用下桩基的抵抗变形能力和承载力.

关键词: 岩土工程, 地震作用, 变截面钢管混凝土单桩, 动力响应, 数值模拟

Abstract: In order to explore the dynamic response of variable section steel pipe concrete pile foundation under earthquake when the bridge is located in a weak soil layer, taking Xiangan Bridge as the engineering background, the numerical model of pile-geotechnical-steel pipe coupling under earthquake action was established by using FLAC3D finite element software, and the dynamic response differences of variable section steel pipe concrete monopile, a variable section ordinary concrete single pile body acceleration, pile body displacement and pile bending moment under different strength of earthquake were studied. The results show that the pile body acceleration, acceleration amplification coefficient, pile displacement maximum value and pile bending moment variation law of variable section steel tube concrete monopile under earthquake action are similar to those of ordinary concrete monopile with variable section, but the acceleration amplification coefficient of the pile body is reduced, and the lateral deformation resistance and bending bearing capacity of the pile foundation are improved. Therefore, the steel pipe can significantly improve the deformation resistance and bearing capacity of the pile foundation under the action of earthquake.

Key words: geotechnical engineering, seismic action, variable section steel tube concrete monopile, dynamic response, numerical simulation

中图分类号:

U433.15

冯忠居,张亮,张聪,邓友生,李宇杰. 地震作用下变截面钢管混凝土单桩动力响应[J]. 河北大学学报(自然科学版), 2024, 44(2): 122-130.

FENG Zhongju, ZHANG Liang, ZHANG Cong, DENG Yousheng,LI Yujie. Dynamic response of variable section steel tube concrete monopile under earthquake action[J]. Journal of Hebei University(Natural Science Edition), 2024, 44(2): 122-130.

参考文献

[1] FENG Z J, HU H B, DONG Y X, et al. Effect of steel casing on vertical bearing characteristics of steel tube-reinforced concrete piles in loess area[J]. Appl Sci, 2019, 9(14): 2874. DOI: 10.3390/app9142874.
[2] 张聪,冯忠居,王富春,等.强震区软弱土层差异厚度下单桩动力响应振动台试验[J].岩土力学, 2023, 44(4): 1100-1110. DOI: 10.16285/j.rsm.2022.0700.
[3] DONG Y X, FENG Z J, HE J B, et al. Seismic response of a bridge pile foundation during a shaking table test[J]. Shock Vib, 2019, 2019: 9726013. DOI: 10.1155/2019/9726013.
[4] 吴薪柳,姜忻良.结构-桩-土振动台试验桩土地震反应规律分析[J].工程力学, 2011, 28(S1): 201-204, 210.
[5] 李雨润,罗祥,张中乐,等.两种饱和土中桩基侧向动力响应特性试验研究[J].建筑结构, 2013, 43(23): 100-104, 99. DOI: 10.19701/j.jzjg.2013.23.019.
[6] 冯忠居,张聪,何静斌,等.强震作用下近断层桥梁桩基动力响应[J].交通运输工程学报, 2022, 22(4): 159-169. DOI: 10.19818/j.cnki.1671-1637.2022.04.012.
[7] 何静斌,冯忠居,董芸秀,等.强震区桩-土-断层耦合作用下桩基动力响应[J].岩土力学, 2020, 41(7): 2389-2400. DOI: 10.16285/j.rsm.2019.2122.
[8] 冯忠居,关云辉,张聪,等.强震作用下桩-土-断层非线性动力响应特性[J].地震工程与工程振动, 2022, 42(2): 62-70. DOI: 10.13197/j.eeed.2022.0207.
[9] 冯忠居,关云辉,赖德金,等.强震作用下桩-土-断层非线性动力相互作用特性[J].世界地震工程, 2021, 37(4): 167-176. DOI: 10.3969/j.issn.1007-6069.2021.04.018.
[10] LIU C Y, SUN D K, HAN M F. Pile foundation analysis of ground motion transfer law[J]. Adv Mater Res, 2011, 368/369/370/371/372/373: 2915-2918. DOI: 10.4028/www.scientific.net/amr.368-373.2915.
[11] CHANG D W, CHENG S H, WANG Y L. One-dimensional wave equation analyses for pile responses subjected to seismic horizontal ground motions[J]. Soils Found, 2014, 54(3): 313-328. DOI: 10.1016/j.sandf.2014.04.018.
[12] 陆建飞,聂卫东.饱和土中单桩在瑞利波作用下的动力响应[J].岩土工程学报, 2008, 30(2): 225-231. DOI: 10.3321/j.issn: 1000-4548.2008.02.012.
[13] 刘新荣,方焘,耿大新,等.大直径变径桩横向承载特性模型试验[J].中国公路学报, 2013, 26(6): 80-86, 190. DOI: 10.19721/j.cnki.1001-7372.2013.06.012.
[14] LIU R, LIANG C. Study of the bearing capacity at the variable cross-section of A riser-surface casing composite pile[J]. China Ocean Eng, 2021, 35(2): 262-271. DOI: 10.1007/s13344-021-0023-2.
[15] 胡文韬,刘豆,耿大新,等.水平受荷阶梯形变截面桩的内力及变形分析[J].浙江大学学报(工学版), 2020, 54(4): 739-747. DOI: 10.3785/j.issn.1008-973X.2020.04.013.
[16] 王奎华,高柳,吴君涛,等.三维波动土中考虑桩身变截面与桩周土相互作用的大直径桩的动力特性[J].岩石力学与工程学报, 2017, 36(2): 496-503. DOI: 10.13722/j.cnki.jrme.2016.0665.
[17] 曹文贵,刘成学,赵明华.变截面桩的屈曲分析[J].湖南大学学报(自然科学版), 2004, 31(3): 55-58. DOI: 10.3321/j.issn: 1000-2472.2004.03.013.
[18] GAO L, WANG K H, XIAO S, et al. Dynamic response of a pile considering the interaction of pile variable cross section with the surrounding layered soil[J]. Num Anal Meth Geomechanics, 2017, 41(9): 1196-1214. DOI: 10.1002/nag.2681.
[19] GAO L, WANG K H, WU J T, et al. Analytical solution for the dynamic response of a pile with a variable-section interface in low-strain integrity testing[J]. J Sound Vib, 2017, 395: 328-340. DOI: 10.1016/j.jsv.2017.02.037.
[20] 张菊辉,王伟,姜大威,等.钢护筒-混凝土灌注桩承台节点抗震性能试验研究[J].振动与冲击, 2018, 37(3): 79-84. DOI: 10.13465/j.cnki.jvs.2018.03.013.
[21] ZHOU W W, GAO R X, ZHU H P, et al. Behavior of steel casing composite piles under lateral loading and parameter optimization[J]. Eng Struct, 2020, 220: 110991. DOI: 10.1016/j.engstruct.2020.110991.
[22] 穆保岗,班笑,龚维明.考虑钢护筒效应的混合桩水平承载性能分析[J].土木建筑与环境工程, 2011, 33(3): 68-73, 118. DOI: 10.3969/j.issn.1674-4764.2011.03.012.
[23] LI X Z, ZHANG S M, LU W, et al. Axial compressive behavior of steel-tube-confined concrete-filled-steel-tubes[J]. Thin Walled Struct, 2022, 181: 110138. DOI: 10.1016/j.tws.2022.110138.
[24] ZHU T, LIANG H J, LU Y Y, et al. Axial behaviour of slender concrete-filled steel tube square columns strengthened with square concrete-filled steel tube jackets[J]. Adv Struct Eng, 2020, 23(6): 1074-1086. DOI: 10.1177/1369433219888726.
[25] 张素梅,李孝忠,陈雄图,等.圆钢管约束加强的方钢管混凝土短柱轴压性能研究[J].建筑结构学报, 2021, 42(S2): 170-179. DOI: 10.14006/j.jzjgxb.2021.S2.0020.
[26] WANG Y Y, YANG L G, YANG H, et al. Behaviour of concrete-filled corrugated steel tubes under axial compression[J]. Eng Struct, 2019, 183: 475-495. DOI: 10.1016/j.engstruct.2018.12.093.
[27] KWAN A K H, DONG C X, HO J C M. Axial and lateral stress-strain model for concrete-filled steel tubes[J]. J Constr Steel Res, 2016, 122: 421-433. DOI: 10.1016/j.jcsr.2016.03.031. (