某一级建筑柱下独立桩基,桩基竖向荷载(荷载效应基本组合)设计值F=6200kN,弯矩

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问题:

某一级建筑柱下独立桩基,桩基竖向荷载(荷载效应基本组合)设计值F=6200kN,弯矩M=350kN·m,水平力JH=500kN,承台埋深2.5m,承台及承台上土重设计值G=300kN。

建筑场地地层条件:

(1)0~12m粉质黏土,重度γ=19kN/m3,e=0.80,可塑状态,地基土极限承载力标准值qck=200kPa

(2)12~14m细砂、中密~密实

(3)14~19m砾石、卵石层

(4)19~28m粉质黏土

(5)28~35m卵石层

(6)35~45m粉土

(7)地下水位于地面下3.5m。

采用水下钻孔灌注桩,桩径d=800mm,4根:承台及桩尺寸如下图所示。

如果M=35×04kN·m,题中条件下,各桩对x轴的弯矩与()项值接近。

A.3900kN·m

B.4000kN·m

C.4100kN·m

D.4200kN·m

考点:二级注册结构工程师二级注册结构工程师
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