问题 单项选择题

某拟建高度为59m的16层现浇钢筋混凝土框架-剪力墙结构,质量和刚度沿高度分布比较均匀,对风荷载不敏感,其两种平面方案如图所示。假设在如图所示的风作用方向两种结构方案的基本自振周期相同。

当估算主体结构的风荷载效应时,试问,方案(a)与方案(b)的风荷载标准值(kN/m2)之比,与下列何项数值最为接近?()

A.1:1

B.1:1.15

C.1:1.2

D.1.15:1

答案

参考答案:D

解析:

解答如下:根据《高层建筑混凝土结构技术规程》4.2.1条;wkzμsμzw0,两个方案中的μz、w0相同,又由《建筑结构荷载规范》8.4.3条~8.4.6条,故βs也相同,所以仅μs不同。

根据规程4.2.3条:H/B=59/14=4.214,L/B=14/14=1<1.5

μsa=1.4

故:

阅读理解

阅读理解。

     Which would you like a hot dog, a hamburger, or a piece of pizza? Young people of today select 

 pizza as their favorite food. Hot dogs were number one in the past, but now they are third in the list. 

 Hamburgers are second.          

     After World War II, pizza came to the United  States from Italy. Since then it has become more  and 

 more popular. Every American eats about  thirty-one slices of pizza each year.     

     Pizza has more food value than hamburgers and hot dogs. That is, pizza is one kind of healthier food 

 for your body. There are many kinds of  pizza, but a plain cheese pizza is still the most popular.

1. The second popular food among young people today is _____.

    A. hot dogs                  

    B. pizza

    C. hamburgers              

    D. cheese

2. Today, hot dogs are the_____.

    A. cheapest food

    B. most popular food

    C. most healthy food

    D. third most popular food

3. The best title (标题) for the passage is

    A. Pizza-The Favorite Food

    B. Pizza and World War II

    C. Pizza Keeps You Healthy

    D. Hot dogs and Hamburgers

4. How much pizza does one American eat each year?

    A. One piece of bread.

    B. Two slices of pizza.

    C. Thirty pieces of bread.

    D. Thirty-one slices of pizza.

5. Is the pizza healthy for our body?

    A. Yes, it is.

    B. No, it isn't.

    C. Sorry, I don't know.

    D. Yes, they are.

单项选择题