问题 单项选择题

某6层办公楼的框架(填充墙)结构,其平面图与计算简图如题图所示。

已知:1~6层所有柱截面为500mm×600mm;所有纵向梁(X向)截面均为250mm×500mm,自重3.125kN/m:所有横向梁(y向)截面均为250mm×700mm,自重4.375kN/m:所有柱、梁的混凝土强度等级均为C40。2~6层楼面永久荷载5.0kN/m2,活载2.5kN/m2:屋面永久荷载7.0kN/m2,活载0.7kN/m2;楼面和屋面的永久荷载包括楼板自重、粉刷与吊顶等。除屋面梁外,其他各层纵向梁(X向)和横向梁(y向)上均作用有填充墙、门窗等均布线荷载2.0kN/m。计算时忽略柱子自重的影响。上述永久荷载与活载均为标准值。

提示:计算荷载时,楼面及屋面的面积均按轴线间的尺寸计算。

当对2~6层⑤⑥—轴线问的楼板(单向板)进行计算时,假定该板的跨中弯矩为0.1ql2,试问该楼板每米宽板带的跨中弯矩设计值M(kN·m)应和下列()项数值最为接近。

A.M=12.00

B.M=16.40

C.M=15.20

D.M=14.72

答案

参考答案:D

解析:

由于楼面永久荷载5.0kN/m2大于活荷载2.5kN/m2,应用《建筑结构荷载规范》3.2.3—2

完形填空
请阅读下面这篇文章,根据所提供的信息,完成下面表格。
Animals are natural resources(自然资源) that people have wasted all through our history. Animals have been killed for their fur and feather, for food, for sport, and simply because they were in the way. Thousands of kinds animals have disappeared from the earth forever. Hundreds more are on the danger list today. About 170 knids in the United States alone are considered in danger.
Why should people care? Because we need animals, and because once they are gone, there will never be any more. Animals are more than just beautiful or interesting. They are more than just a source of food. Every animal has its place in the balance of nature. Destroying one kind of animal can cause many problems. For example, when farmers killed large numbers of hawks(鹰), the farmers’ stores of corn and grain were destroyed by rats and mice. Why? Because hawks eat rats and mice, with no hawks to keep down their numbers, the rats and mice multiplied quickly.
Luckily, some people are working to help save animals. Some groups raise money to let people know abut the problem. And they try to get the governments to pass laws protecting animals in danger. However, quite a few countries have passed laws. Slowly, the number of some animals in danger is growing.
What people have wasted all through history
小题1:_______
The number of kinds of animals in the USA considered in danger
小题2:_______
The animal that eats rats and mice
小题3:_______.
Who will pass laws to protect the animals
小题4:_______
The number of countries which have passed laws
小题5:_______.
解答题