问题 单项选择题

73~77 桥梁标准跨径L=20.00m,梁长L=2000-4=1996em。桥梁的计算跨径L0=19.962× 0.23=19.50m。桥宽B=8.5m(车道宽7.50m)。采用5片钢筋混凝土梁,如题73—77图(a)所示。汽车荷载:公路-Ⅰ级,人群荷载3.0kN/m。

采用杠杆原理法计算1号梁的荷载横向分布系数,与下列()值接近

A.m1q=0.238,m1r=1.222

B.m1q=0.338,m1r=1.322

C.m1q=0.538,m1r=1.522

D.m1q=0.438,m1r=1.422

答案

参考答案:D

解析:

1号梁是边梁,是横向结构(简支于1、2号梁肋上外伸梁)的支承。横向结构反力影响线如题 73图(b)所示。它就是1号梁的横向影响线。按规范要求横向布载(车轮中线与缘石的距离为 0.5m),公路-Ⅱ级车辆荷载的轴距见题73图(b),计算横向分布系数:

1号梁影响线计算结果见题73图(b)

公路-Ⅱ级:

人群荷载:

多项选择题 案例分析题
阅读理解

第三部分:阅读理解 

第一节 阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。(共15小题,每小题2分,共30分)           

A

It was midnight in Paris and we were rolling toward Avenue Bosguet. As we came to the Pont Alexandra Ⅲ, the taxi slowed down, for the traffic light was red against us, and then, without stopping, we sailed through the red in a sudden burst of speed. The same performance was repeated at the Alma Bridge. As I paid the driver, I asked him why he had driven through two red lights.

“You ought to be ashamed of yourself, breaking the law and endangering your life that way ,” I protested.

He looked at me, astonished. “Ashamed of myself? I am a law abiding(守法的)citizen and have no desire to get killed either.” He cut me off before I could protest.

“No, just listen to me before you complain .What did I do? Went through a red light. Well, did you ever stop to consider what a red light is, what it means?”

“Certainly,” I replied. “It’s a stop signal and means that traffic is rolling in the opposite direction.”

“Half-right,” said the driver, “but incomplete. It’s only an automatic stop signal. And it does not mean that there is cross traffic. Did you see any cross traffic during our trip? Of course not. I slowed down at the light, looked carefully to the right and to the left. Not another car on the street at this hour. Well, then! What would you have me do? Should I stop like a stupid animal because an automatic, brainless machine turns red every forty seconds? No, sir,” he shouted. “I am a man, not a machine. I have eyes and a brain and judgment, given me by God. Ashamed of myself, you say? I would only be ashamed of myself if I let those blinking lamps do my thinking for me. Good night ,sir.”

Is this bad, is this good? Frankly I am no longer sure...

56. At the Alma Bridge,_________.

A. the writer stopped the taxi and paid the driver              

B. the taxi went through a red light again

C. there was a performance the writer had already watched

D. the writer began to criticize the driver

57. To the taxi driver, a red light_________.

A. was not a stop signal                            

B. should not work at midnight

C. sometimes made mistakes in judgment    

D. didn’t always mean that there was cross traffic

58. The main reason the driver dared to drive through the red light was that______.

A. he found there was no cross traffic there at that time

B. he thought it a shame to be controlled by a machine

C. he knew no other driver would see him at this hour

D. he didn’t trust any brainless machine

59. According to the passage, the driver thought what he had done was________.

A. law abiding(守法的)                   B .lawbreaking 

C. something to be proud of                     D .something to be ashamed of