问题 单项选择题

某6层办公楼的框架(填充墙)结h构,其平面图与计算简图如图1-6(乙)所示。

已知:1-6层所有柱截面均为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C10。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/m,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,其它各层纵向梁(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。

根据抗震概念设计的要求,该楼房应作竖向不规则的验算,检查在竖向是否存在薄弱层。试问,下述对该建筑是否在薄弱层的几种判断,其中何项是正确的,并说明其理由。()

提示:①楼层的侧向刚度采用剪切刚度ki=GAi/hi

式中:

ki为第i层的侧向刚度;

Aci为第i层的全部柱子的截面积之和;

hci为第i层沿计算方向的截面高度;

hi为第i层的楼层高度;

G为混凝土的剪切模量。

②不考虑土体的对框架侧向刚度影响。

A.无薄弱层

B.第1层为薄弱层

C.第2层为薄弱层

D.第6层为薄弱层

答案

参考答案:B

解析:

依据《建筑结构抗震规范》GB 50011—2001的3.4.2条判断。

为侧向刚度不规则,即1层为薄弱层。故选择B。 依据2010版《建筑结构抗震规范》,解答过程为: 依据《建筑结构抗震规范》GB 50011—2010的表3.4.3-2判断。

 

阅读理解

My grandfather came from Hungary and was the only one in his family who settled down in the United States. The rest of his family remained in Europe. When World War I broke out, he seemed to have become another man, downhearted. Such obvious change was not born out of concern for his welfare, but out of fear: if his only son, my uncle, had to go to war, it would be cousin fighting against cousin.

One day in 1918, my Uncle Milton received his draft notice. My grandparents were very upset. But my mother, at the age of 10, felt on top of the world about her soldier brother going off to war. Realizing how he was regarded by his little sister and all of her friends, my uncle bought them all service pins, which meant that they had a loved one in the service. All the little girls were delighted.

The moment came when my uncle and the other soldiers, without any training but all in uniforms, boarded the train. The band played and the crowd cheered. Although no one noticed. I’m sure my grandmother had a tear in her eye for the only son. The train slowly pulled out, but not about a thousand yards when it suddenly paused. Everyone stared in wonder as the train slowly returned to the station. There was a dead silence before the doors opened and the men started to step out. Someone shouted, “The war is over!” For a moment, nobody moved, but then the people heard someone bark orders at the soldiers. The men lined up in two lines, walked down the steps, and with the band playing, marched down the street, as returning heroes, to be welcomed home. My mother said it was a great day, but she was just a little disappointed that it didn’t last a tiny bit longer.

小题1:What the grandfather was most worried about was ______.

A.the spread of the world war

B.the safety of his two cousins

C.a drop in his living standards

D.his relatives killing each other小题2:The underlined phrase “draft notice” means “______”.

A.order for army service

B.train ticket for Europe

C.letter of rejection

D.note of warning小题3:What did the “service pins”(in Para. 2) stand for in the eyes of the little girls?

A.Strength.

B.Courage.

C.Victory.

D.Honor.小题4:Which of the following words can best describe the ending of the story?

A.Disappointing.

B.Unexpected.

C.Uncertain.

D.Inspiring.

填空题