问题 单项选择题

某次梁截面尺寸为b×h=300mm×600mm,混凝土强度等级为C30,梁箍筋采用HPB300级钢筋,属弯剪扭构件。经计算可按构造要求配置箍筋。试问,该梁箍筋的最小配置选用以下何项最为恰当?()说明:已按最新规范将本题“箍筋采用HPB235级钢筋”改成“HPB300级”。

A.Φ8@300(双肢)

B.Φ8@250(双肢)

C.Φ8@200(双肢)

D.Φ8@150(双肢)

答案

参考答案:C

解析:

根据《混凝土结构设计规范》(GB50010—2010)第9.2.10条,弯剪扭构件箍筋的最小配筋率为:ρsv≥0.28ft/fyv=0.28×1.43/270=0.15%;经比较,该梁箍筋的配置选用φ8@200(双肢)最为接近最小配筋率,=2×50.3/(300×200)=0.17%>0.15%。

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阅读理解

Old Bear

Kevin Henkes(2008), under 40 pages

Target Audience: Preschoolers

Price: $3.8

Content: It is snowing really hard and Old Bear is getting ready for his long nap. As he sleeps, he dreams of being a cub again and enjoying the wonders of nature. He dreams about summer, fall, winter and spring and how each season brings him so much joy! The illustrations(插图) show the beauty of the seasons that Old Bear dreams about. Great book!

Half-Minute Horrors

Susan Rich(2009), 120~160 pages

Target Audience: Intermediates (4th~6th grade)

Price: $9.6

Content: Looking for a scary book that is also quick to read? How about a one-paragraph tale of terror or a simple drawing that will make your skin crawl? This book is a collection of very short stories, pictures and cartoons from an impressive group of authors and illustrators.

Leaves

David Ezra Stein(2007), under 40 pages

Illustrated by David Ezra Stein

Target Audience: Toddlers, Preschoolers

Price: $3.4

Content: It’s Little Bear’s first year. Fall has come to his island. When the leaves begin to fall, he wonders what to do. However, after following his instinct and sleeping through the winter, he awakens in spring to find everything blooming once again.

Thanksgiving at the Tappletons’

Eileen Spinelli (2003) , under 40 pages

Illustrated by Megan Lloyd

Target Audience: Preschoolers

Price: $3.5

Content: The Tappletons (bears) are gathered together for their big Thanksgiving feast. However, all is not going well during the preparations. The turkey slides out of the house, down a hill and into a pond. There are no pies at the bakery and the lettuce for the salad has been given to the rabbits. As they sit down for the feast, Grandmother Tappleton reminds them that although they have nothing to eat, they can still be thankful that they have each other.

小题1:Which book has the most pages?

A.Old Bear

B.Half-Minute Horrors

C.Leaves

D.Thanksgiving at the Tappletons’.小题2:What can we learn from the book Thanksgiving at the Tappletons’?

A.We should always keep things in order.

B.We should try to make more delicious food on Thanksgiving.

C.If we don’t work hard, there will be no food.

D.Family love is the most important thing.小题3:If you like reading horror stories, which book would you like?

A.Old Bear

B.Half-Minute Horrors

C.Leaves

D.Thanksgiving at the Tappletons’.小题4:Who are the main readers of these books?

A.Adults.

B.Old people

C.Little children

D.Middle school students.小题5:Where can you probably find this passage?

A.In a travel guide.

B.In an advertisement.

C.In a science textbook.

D.In an official report