问题 单项选择题 案例分析题

某办公楼现浇钢筋混凝土三跨连续梁如下图所示,其结构安全等级为二级,混凝土强度等级为C30,纵向钢筋采用HRB335级钢筋(),箍筋采用HPB300级钢筋(Φ)。梁上作用的恒荷载标准值(含自重)gk=25kN/m,活荷载标准值qk=20kN/m。

提示:计算梁内力时应考虑活荷载的不利布置,连续梁内力系数见下表。连续梁内力系数表(弯矩M=表中系数×ql2,剪力V=表中系数×ql)

说明:已按最新规范将本题“箍筋采用HPB235级钢筋”改成“HPB300级”。

该梁的截面如下图所示。截面尺寸b×h=300mm×600mm,翼缘高度(楼板厚度)h′f=100mm,楼面梁间净距sn=3000mm。试问,当进行正截面受弯承载力计算时,该梁跨中截面受压区的翼缘计算宽度b′f(mm)取下列何项数值最为合适?()

A.900

B.1500

C.2400

D.3300

答案

参考答案:C

阅读理解

阅读理解。

     The drug store was closing for the night and Alfred Higgins was about to go home when his new

boss approached him.

     "Empty your pockets please, Alfred,” Sam Carr demanded in a firm voice.

Alfred pretended to be shocked but he knew he’d been caught. From his coat he withdrew a make-up

kit, a lipstick and two tubes of toothpaste.

     "I’m disappointed in you, Alfred!” said the little gray-haired man.

     "Sorry, sir. Please forgive me. It’s the first time I’ve ever done such a thing,” Alfred lied, hoping

to gain the old man’s sympathy.

     Mr Carr’s brow furrowed as he reached for the phone, “Do you take me for a fool? Let’s see

what the police have to say. But first I’ll call your mother and let her know her son is heading to jail.”

    "Do whatever you want,” Alfred shot back, trying to sound big. But deep down he felt like a child.

He imagined his mother rushing in, eyes burning with anger, maybe in tears. Yet he wanted her to

come quickly before Mr. Carr called the police.

     Mr. Carr was surprised when Mrs Higgins finally arrived. She was very calm, quiet and friendly.

“Is Alfred in trouble?” she asked.

     "He’s been stealing from the store,” the old man coolly replied.

     Mrs. Higgins put out her hand and touched Mr. Carr’s arm with great gentleness as if she knew

just how he felt. She spoke as if she did not want to cause him any more trouble. “What do you want

to do, Mr. Carr?”

     The woman’s calm and gentle manner disarmed the once-angry store-owner. “I was going to get

a cop. But I don’t want to be cruel. Tell your son not to come back here again, and I’ll let it go.” Then

he warmly shook Mrs. Higgins’s hand.

     Mrs. Higgins thanked the old man for his kindness, then mother and son left. They walked along the

street in silence. When they arrived home his mother simply said, “Go to bed, you fool.”

In his bedroom, Alfred heard his mother in the kitchen. He felt no shame, only pride in his mother’s

actions. “She was smooth!” he thought. He went to the kitchen to tell her how great she was, but was

shocked by what he saw.

    His mother’s face looked frightened, broken. Not the cool, bright face he saw earlier. Her lips

moved nervously. She looked very old. There were tears in her eyes.

     This picture of his mother made him want to cry. He felt his youth ending. He saw all the troubles

he brought her and the deep lines of worry in her grey face. It seemed to him that this was the first

time he had ever really seen his mother.

1. Which of the following is true according to the passage?

A. It was the first time Alfred had stolen anything.

B. Alfred tried to sound big to hide his fear.

C. Mr. Carr set a trap to catch Alfred stealing.

D. Mr. Carr had planned to forgive Alfred from the beginning.

2. What does the underlined word “disarmed” probably mean?

A. annoyed  

B. made less angry

C. convinced  

D. got over

3. What was the mother’s attitude toward Alfred?

A. She felt disappointed with him.          

B. She was very strict with him.

C. She was supportive of him.              

D. She was afraid of him.

4. What impressed Alfred most about his mother at the drugstore was ________

A.how angry she was                  

B. that she didn’t cry

C.that she was able to save him          

D. how effectively she handled Mr. Carr

5. From the last paragraph, we know that Alfred ________.

A.was no longer a youth                

B. felt proud of his mother

C.wanted his mother to be happy        

D. felt guilty and regretful for his deed

判断题