问题 单项选择题

某42层现浇框架一核心筒高层建筑,如题27~32图所示,内筒为钢筋混凝土筒体,外周边为型钢混凝土框架,房屋高度132m,建筑物的竖向体型比较规则、均匀。该建筑物抗震设防烈度为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Ⅱ类。结构的计算基本自振周期T1=3.0s,周期折减系数取0.8。

该建筑物总重力荷载代表值为6×105kN。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8600kN;对应于地震作用标准值且未经调整的各层框架总剪力中,底层最大,其计算值为1500kN。试问,抗震设计时,对应于地震作用标准值的底层框架总剪力的取值,应最接近于下列()项数值。

A.1500KN

B.1720kN

C.1920KN

D.2250KN

答案

参考答案:C

解析:

根据《高2010》4.3.13条,

取V0=9600kN

根据《高2010》8.1.4条,V1取0.2V0及1.5Vf,max中之小者,

0.2V0=0.2×9600=1920kN

1.5Vf,max=1.5Vf,1=1.5×1500=2250kN>1920kN

取V1=1920kN

阅读理解

More and more people like bicycling and it is no surprise. It is fun, healthy and good for the environment. Maybe that’s why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can take you almost anywhere, and there is no oil cost!

Get on a bicycle and ride around your neighborhood. You may discover something new all around you. Stopping and getting off a bike is easier than stopping and getting out of your car. You can bike to work and benefit (受益) from the enjoyable exercise without polluting the environment. You don’t even have to ride all the way.

Folding (折叠) bikes work well for people who ride the train. Just fold the bike and take it with you. You can do the same on an airplane. A folding bike can be packed in a suitcase. You can also take a common bike with you when you fly. But be sure to look for information by getting on airline websites. Not all airlines are bicycle-friendly to travelers.

Health Benefits of Bicycling:

l It helps to prevent heart diseases.

l Bicycling helps to control your weight.

A 15-minute bike ride to and from work three times a week burns off five kilos of fat in a year.

l Bicycling can improve your mood (心情).

Exercise like bicycling has been shown to make people feel better, more relaxed and self-confident.

l Bicycling is healthier than driving.

小题1:From the passage, we know that bicycling is becoming very __________.

A.surprising

B.exciting

C.expensive

D.popular小题2:When you are riding your bicycle around your neighborhood, you may __________.

A.pollute the environment around

B.find something you didn’t notice

C.go everywhere and use a little oil

D.get off your bike and begin to work小题3:If you travel with a folding bike, you can fold it and __________.

A.get out of the car

B.take it onto a train

C.put it in your purse

D.go on airline websites小题4: One of the benefits from bicycling is that __________.

A.you can fold the bicycle

B.you will be friendly to others

C.you will be more relaxed

D.you may get fatter and fatter小题5:Which is TRUE according to the passage?

A.Bicycling is enjoyable exercise for people.

B.Driving cars is healthier than riding bikes.

C.Riding a bike pollutes your neighborhood.

D.Common bikes are welcomed by all airlines.

单项选择题