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.
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.
作者
冯忠居
张亮
张聪
邓友生
李宇杰
FENG Zhongju;ZHANG Liang;ZHANG Cong;DENG Yousheng;LI Yujie(School of Highway,Chang an University,Xi an 710064,China;School of Architecture and Civil Engineering,Xi an University of Science and Technology,Xi an 710054,China)
出处
《河北大学学报（自然科学版）》
CAS
北大核心
2024年第2期122-130,共9页
Journal of Hebei University(Natural Science Edition)
基金
福建省交通运输科技项目(202105)。
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
geotechnical engineering
seismic action
variable section steel tube concrete monopile
dynamic response
numerical simulation
