问题 单项选择题

某门式刚架单层厂房基础,采用钢筋混凝土独立基础,如图所示,混凝土短柱截面500mm×500mm,与水平作用方向垂直的基础底边长l=1.6m,相应于作用的标准组合时,作用于混凝土短柱顶面处的竖向力为Fk,水平力为Hk,基础采用混凝土等级为C25,基础底面以上土与基础的加权平均重度为20kN/m3,其他参数见图。

假设b=2.4m,基础冲切破坏锥体的有效高度h0=450mm,试问,冲切面(图中虚线处)的冲切承载力设计值(kN),与下列何项数值最为接近?()

A.380

B.400

C.420

D.450

答案

参考答案:A

解析:

解答如下:

根据《建筑地基基础设计规范》式(8.2.8-1)、式(8.2.8-2):

ab=at+2h0=500+2×450=1400mm<l=1600mm

即冲切破坏锥的底面在l方向落在基底面以内

am=(at+ab)/2=(500+1400)/2=950mm

0.7βhpftamh0=0.7×1×1.27×950×450=380.05kN

首先应判断冲切破坏锥的底面在l方向是落在基础底面以内,还是以外,即:ab≤l或ab>l。

完形填空

One Friday night, a poor young man stood at the train station. He played his violin and many people put 41  into the hat in front of him.  

The next day, the young man came to the station 42  . But this time he took out a large piece of paper 43 some words on it. It said “Last night a lady 44  Mrs Sang put an important thing into my hat 45  . Please come for it.”  

After about an hour, a middle-aged woman ran to the young man in a hurry and said, “You do come here. I know that you’re a(n) 46  man and will certainly come here.” They had a talk and the young man made sure she was the owner. Then he took out a lottery ticket and 47  it to the woman. Her husband bought a lottery ticket every day. Yesterday when she knew the lottery ticket he bought won, she was very 48  . The prize of the lottery ticket was $ 500,000. When she walked past the young man, she took out $50 and put it in the hat. 49  , the lottery ticket was also thrown in.  

Later, someone asked the young man, “You play the violin every day to make money. Why didn’t you just take the prize of the lottery ticket for yourself?” the young man said,“Although I don’t have much money, I live happily. But if I 50  honesty, I won’t be happy forever.”  

小题1: A. money       B. tickets          C. paper  

小题2: A. instead       B. differently      C. again  

小题3: A. for          B. with           C. over  

小题4: A. introduced    B. spelled         C. named  

小题5: A. by mistake     B. for mistake      C. on mistake  

小题6: A. crazy         B. cool        C. honest  

小题7: A. gave          B. lent            C. offered  

小题8: A. surprising       B. happy          C. exciting  

小题9: A. But            B. However      C. Therefore  

小题10: A. have            B. win             C. lose  

单项选择题