试题与答案

某承重柱下采用干作业钻孔灌注桩9桩独立基础,其桩长、桩径、承台尺寸及工程地质情况如图

题型:单项选择题

题目:

某承重柱下采用干作业钻孔灌注桩9桩独立基础,其桩长、桩径、承台尺寸及工程地质情况如图所示。建筑桩基安全等级为二级。桩和承台混凝土强度等级为C20。桩基承台和承台上土自重设计值G=520kN。要求按《建筑桩基技术规范》(JCJ 94--94)进行设计计算。

当荷载效应为基本组合时,在偏心竖向力作用下,下列的()是正确的桩基中基桩的竖向承载力极限状态计算表达式。

式中,γ0建筑桩基重要性系数;N轴心竖向力作用下任一基桩的竖向力设计值;Nmax偏心竖向力作用下,基桩最大竖向力设计值;R基桩的竖向承载力设计值。

A.Nmax≤1.5R

B.γ0Nmax≤1.2R

C.N≤1.25R

D.γ0N≤R,γ0Nmax≤1.2R

答案:

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