问题 单项选择题

根据业主要求需要在一混凝土厂房内用Γ形钢制刚架搭建一个不直接承受动力荷载的工作平台。横梁上承受均布荷载q=45kN/m(设计值),柱顶有一集中荷载P=93kN(设计值)。钢材为Q235=B·F。刚架横梁的一端与混凝土柱铰接(刚架可不考虑侧移):其结构的计算简图、梁柱的截面特性以及弯矩计算结果如题图所示。

提示:柱间有垂直支撑,A、B点可作为AB柱的侧向支承点。

柱:A=8208mm2 梁:A=9440mm2

lx=13850×104mm4 lx=34610×104mm4

Wx=923×103mm3 Wx=1525×103mm3

ix=130mm ix=192mm

ly=3130×104mm4 Sx=848×103mm3

iy=61.7mm

假定横梁在B点处的做法如图所示,当对柱AB进行强度验算时(截面无孔洞削弱),其最大正应力与()项数值相近。

A.177.3N/mm2

B.190.4N/mm2

C.204.6N/mm2

D.213.5N/mm2

答案

参考答案:D

解析:

由规范

完形填空

We are proud of Li Na who is a Chinese professional 小题1:                player and has won 5 WTA and 19 ITF singles titles. Li won the 2011 French Open singles title, making her the first Asian country representative to win a Grand Slam in singles. With her performance at the 2011 Australian Open, she 小题2:               the first player from an Asian country to appear in a Grand Slam singles final.

Li Na was born 小题3:                February 26, 1982, in Wuhan, Hubei, China. Her father Li Shengpeng was a 小题4:            badminton, following her father’s footsteps. Just before she turned eight, Li started to play tennis when she and her parents were convinced (说服)小题5:            coach Xia Xiyao of the Wuhan Youth Tennis Club that this would be the right career move for her. Li joined China’s National Tennis Team in 1997 and at the end of 2002, Li 小题6:             the national tennis team to study part-time at Huazhong University of Science and Technology,小题7:              she completed her bachelor’s (本科) degree in journalism in 2009. She returned to the national team in 2004. Jiang Shan married Li and became her personal coach in 2006. Li left the national team in 2008 and organized her own team. This change was小题8:               “Fly Alone” by Chinese media. As a result Li had the freedom to pick her own coaching staff and she could keep more of her winnings.

This year, she won the championship in Australia open. How小题9:               we were when we heard of the good news! Congratulations to Li Na!

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