问题 单项选择题

某烧结普通砖砌体结构,因特殊需要需设计有地下室,如图所示,房屋的长度为L、宽度为B,抗浮设计水位为-1.0m,基础底面标高为-4.0m;算至基础底面的全部永久荷载标准值为gk=50kN/m2,全部活荷载标准值pk=10kN/m2。砌体施工质量控制等级为B级,结构重要性系数γ0=1.0。设计使用年限为50年。

二层某外墙立面如图所示,墙体设构造柱,墙厚370mm,墙洞宽0.9m,高1.2m。窗台高于楼面0.9m,砌体的弹性模量为E(MPa)。试问,该外墙层间等效侧向刚度(N/mm),与下列何项数值最为接近()

提示:墙体剪应变分布不均匀系数ξ=1.2;取G=0.4E。

A.217E

B.235E

C.285E

D.195E

答案

参考答案:A

解析:

解答如下:

根据《建筑抗震设计规范》7.2.3条:窗洞高度1.2m<3.0×50%=1.5m,按窗洞考虑。

,查规范表7.2.3,取影响系数为0.88。

,不考虑弯曲变形

由于窗洞1.5m未大于层高的50%,故根据《建筑抗震设计规范》表7.2.3注的规定,按窗洞考虑;否则,应按门洞处理。此外,本题目洞口中线偏离墙段中线的距离为1500mm,不大于墙段长度的1/4,即:

6000×1/4=1500mm,故不考虑影响系数的折减。

完形填空
完形填空。
      Every year many people get hurt or die in traffic accidents. People make traffic   1   for some reasons, so we
must obey them. Different countries have different traffic rules. In China, all the cars and buses keep on the   2  
of the road.   3   we cross the road, we must   4   and look at both sides (first left then right). But in England,
the traffic is on the left. When you cross the road, you should look   5   first or you may be in an accident.
      People have to obey many traffic rules. You must walk   6   the sidewalk. If you like riding a bike, don't ride
in the middle of the road   7   run through red traffic lights (闯红灯). When you ride a bike with a friend,   8   
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D. helpful    
单项选择题