竖向荷载作用下单斜桩承载力及可靠性分析

混凝土桩受基坑开挖、施工扰动等因素影响可能会发生倾斜,导致其工作性状发生变化。为获得不同倾斜角度对单桩承载力的影响及规律,采用单桩静载试验与有限元数值模拟试验相结合的方法,研究竖向荷载作用下不同倾斜角度单桩的荷载传递特征和桩顶沉降变形。研究结果表明,倾斜桩顶沉降量在相同桩顶竖向荷载作用下,随着倾斜角度的增大而增大;在桩体刚度足够大的情况下(极限荷载内),倾斜角在8°以内桩顶沉降小于竖直桩,说明桩身入土后,在结构完整的情况下,桩身的自身承载力并不会因为桩身的轻微倾斜而降低。

Effect of pile-soil-structure interaction on the cable-stayed bridge in response to the earthquake

In this thesis, based on the design of a 140＋90m span unusual single tower and single cable plane cable-stayed bridge, fi＇ee vibration characteristics and seismic response are investigated; three dimensional finite element models of a single tower cable-stayed bridge with and without the pile-soil-strucW.re interaction are established respectively by utilizing finite element software MIDAS/CIVIL, seismic response of Response spectrum and Earthquake schedule are analyzed respectively and compared. By the comparison of the data analysis, for small stiffness span cable-stayed bridge, the pile-soil-structure interaction can not be ignored with calculation and analysis of seismic response.