问题 单项选择题

某62m高层建筑采用现浇钢筋混凝土框架-剪力墙结构,位于7度抗震设防区,设计基本地震加速度为0.15g,丙类建筑,Ⅲ类场地,其中某一楼层柱截面尺寸为800mm×800mm,采用C30混凝土,箍筋用HPB300级钢筋,配置

井字复合箍,;柱净高2800mm,弯矩反弯点位于柱高中部,试问,该柱的轴压比限值[μN],与下列何项数值最为接近()

A.0.70

B.0.75

C.0.80

D.0.85

答案

参考答案:A

解析:

解答如下:

丙类建筑,7度(0.15g),Ⅲ类场地,根据《高层建筑混凝土结构技术规程》3.9.2条,应按8度考虑抗震构造措施所采用的抗震等级;查规程表3.9.3,H=62m>60m,故框架抗震等级为一级。

抗震一级,查规程表6.4.2,[μN]=0.75;

,根据规程表6.4.2注3规定:

N]=0.75-0.05=0.70

应注意的是,场地类别、设计基本地震加速度对确定抗震构造措施的影响。

单项选择题

In the United States and in many other countries around the world, there are four main ways for people to be (91) about developments in the news: newspapers, magazines, and radio or television news broadcasts. A person may use one, or all, of these (92) for information. Each source is useful in its (93) way. Newspapers and magazines can give much information about a particular event. They may (94) some history of the event, some of its (95) , some of its effects, or perhaps give an (96) or point of view on a particular development. Radio and television can help a person to be well informed about what is happening each day. It is also (97) to listen to radio or watch TV (98) do something else at the same time. Many people can listen to the news on their car radio while driving (99) . For the student of English as a foreign language, an English language newspaper may be the most helpful news source that will also (100) you practice in reading English.
Most daily English language newspapers are not very hard to find. They are interesting and helpful in many (101) . In some of them, you may be able to find news about your (102) country. You will find news and information about important national and international political (103) . (104) what you are interested in, you can probably find something in the newspaper about it. A(n) (105) in the newspaper may help you solve a problem. Other stories may be about good movies, concerts, or TV shows.
Usually, an English language newspaper has several (106) or parts. Each part of the newspaper (107) stories about different kinds of news. Some sections have a lot of advertisements which may be helpful if you want to save money. By reading the advertisements, you may find something you want (108) sale. Or you may find that two stories are advertising the (109) thing, but at one store the price is lower. Other sections may have (110) advertisements or have only a specific type of advertisement to interest the people.

A.sections

B.portions

C.divisions

D.chapters

填空题