【摘要】 桩基础设计是桥梁工程设计范畴内一项重要设计内容,近年来由于地震影响造成桩基不均匀沉降,致使桥梁丧失使用功能的事故时有发生。本文以8°抗震设防区实际桥梁工程为例,对某矮塔斜拉索桥主桥部分在非抗震设计条件下和抗震设计条件下桩基计算数据进行对比分析。从设计原则、设计条件、计算方法等方面论述了两者计算结果的异同,可知常规情况时,主桥桥墩下的抗震设计桩长较非抗震设计桩长要长,增大约10%左右,但也并非绝对,个别情况下非抗震设计桩长较大,实际桩长应以抗震和非抗震两种工况的包络值为准。对比分析可得,影响主桥桥墩下摩擦桩实际桩长的因素主要有:地质条件、设防烈度、河床冲刷水位、不同工况条件下桩顶竖向力和弯矩等,这些因素在设计时要逐一考虑。本工程的相关设计数据,可为其他类似埃塔斜拉索桥考虑抗震时桩基础设计提供借鉴。更多还原

【Abstract】 Pile foundation Design of bridge in the category of engineering design is an important design content,in recent years,because of the earthquake impact caused by uneven settlement of pile foundation,in was resulted in lossing usage of the bridge function in the accident.In this paper,taking 8 degrees seismic fortification zone actual bridge project as an example,pile foundation calculated results of a short tower cable-stayed main bridge under the condition of non seismic design and seismic design were contrasted and analyzed.The similarities and differences between the two calculation results were discussed from the design principle,design conditions,calculation methods and other aspects of the case,in the conventional condition,the pile length of seismic design under the main bridge pier is logner than non seismic design,increasing about 10%or so,but it is not absolute,in individual cases pile length of non seismic design is larger,the actual pile length should be according to envelope value of seismic and non seismic conditions.The influence factor of actual friction pile length of main bridge pier are mainly as follows:the geological conditions,seismic fortification intensity,the riverbed scouring water level,vertical force and moment under different conditions,it should be considered one by one in design.Relevant design data of the project,can provide reference for other similar considering seismic ETA cable-stayed bridge pile foundation design.更多还原