问题 单项选择题

某现浇框架一核心筒高层建筑结构,地上35层高130m,内筒为钢筋混凝土,外周边为型钢混凝土框架,抗震设防烈度为7度,丙类,设计地震分组为第一组,设计基本地震加速度为0.1g,场地类别为Ⅱ类,阻尼比ζ=0.04,结构的基本自振周期T1=20s,周期折减系数取0.8。

抗震设计时,在水平地震作用下,对应于地震作用标准值的结构底部总剪力计算值为8800kN;对于地震作用标准值且未经调整的各层框架总剪力中,24层最大,其计算值为1600kN。则各楼层框架的剪力经调整后最接近于( )kN。

A.1500

B.1760

C.1920

D.2400

答案

参考答案:B

解析:
根据《高层建筑混凝土结构技术规程》(JGJ3-2002、J186-2002)第8.1.4条和第9.2.3条,Vf≤0.2V0=0.2×8800=1760kN时,框架总剪力应按0.2V0和1.5Vf,max二者的较小值采用,则可得:
1.5Vf,max=1.5×1600=2400kN
0.2V0=0.2×8800=1760kN
取小值1760kN。

阅读理解

“Choo,Choo!”Here comes the Chunnel train. Get aboard if you want to learn more about this underground transportation system. This is an unusual form of transportation, because it is a tunnel that trains travel through and not an actual form of transportation.

The Chunnel is actually the English nickname for the Channel Tunnel. In French,it is called le tunnel sous la Manche. It is a rail tunnel beneath the English Channel at the Straits of Dover. It connects Cheriton in Kent, England with Sangatte in northern France. It is the second longest rail tunnel in the world.

Did you know that the British and the French had a race while they were building the Chunnel? The race was to see who could get to the middle of the tunnel first. The British won by a little bit. It took 15,000 workers over seven years to dig the tunnel. The tunnel was finished in 1994.

The completed Chunnel cost about $21 billion. But it all paid off, because it became very popular, very quick. Millions of people use it. Now it is getting even more popular.

There are three complete tunnels in the Chunnel. The two outside ones are the passenger trains. The small inner one is a guidance train. The guidance train is not used for transportation. Each track is exactly parallel to each other.

There are four different train systems in the Chunnel. The Eurostar is a high speed passenger service that connects London, Paris, Brussels and Lille. The Eurotunnel shuttle is a rail ferry service. These shuttles carry cars and vans. These are railcars that allow drivers to drive their vehicles on and off. There are also two Eurotunnel goods service trains.

Now you know more about the Chunnel. Everybody off,this is the last stop.

小题1:The Channel Tunnel links   ________with________.

A.London; Paris

B.Cheriton; Sangatte

C.Lille; Brussels

D.Dover; Kent小题2:Which of the following shows the structure of the tunnels in the Chunnel?

小题3:The Eurotunnel shuttle is intended to carry________.

A.passengers

B.drivers and their vehicles

C.goods

D.staff members of the Chunnel小题4:The text can most probably be ________.

A.found in a guidebook

B.read in a magazine

C.broadcast on a train

D.heard in a railway station

单项选择题