问题 单项选择题

22~27:

某厂房的纵向天窗宽8m、高4m,采用彩色压型钢板屋面、冷弯型钢檩条、天窗架:檩条、拉条、撑杆和天窗上弦水平支撑局部布置简图如题图中的图(a)所示;天窗两侧的垂直撑如图(b)所示,工程中通常采用的三种形式天窗架的结构简图分别如图(c)、(d)、(e)所示。所有构件均采用Q235钢,手工焊接时使用E43型电焊条,要求焊缝质量等级为二级。

两铰拱式天窗架如题图(e)所示。斜梁的最大弯矩设计值Mx=30.2kN·m,采用热轧H型钢H200×100×5.5×8,A=2757mm2,Wx=188×103mm3,ix=82.5mm,iy=22.1mm。当按整体稳定性计算时,试问,截面上最大压应力设计值(N/mm2)应与下列()项数值最为接近。
提示:φb按受弯构件整体稳定性系数近似计算方法计算。

A.171.3

B.180.6

C.205.9

D.152.3

答案

参考答案:C

解析:

λy==113

根据《钢规》公式(B5-1),

φb=1.07-=1.07-0.29=0.78

根据《钢规》公式(4.2.2)进行计算;

σ==205.9N/mm2

选择题
单项选择题

King Richard III was a monster. He poisoned his wife, stole the throne from his two young nephews and ordered them to be smothered in the Tower of London. Richard was a sort of Antichrist the King --"that bottled spider, that poisonous bunchbacked toad. "

Anyway, that was Shakespeare’s version. Shakespeare did what the playwright does: he turned history into a vivid, articulate, organized dream-repeatable nightly. He put the crouch back onstage, and sold tickets.

And who Would say that the real Richard known to family and friends was not identical to Shakespeare’s memorably loathsome creation The actual Richard went dimming into the past and vanished. When all the eye-witnesses are gone, the artist’s imagination begins to twist.

Variations on the King Richard Effect are at work in Oliver Stone’s JFK. Richard III was art, but it was propaganda too. Shakespeare took the details of his plot from Tudor historians who wanted to blacken Richard’s name. Several centuries passed before other historians began to write about Richard’s virtues and suggest that he may have been a victim of Tudor malice and what is the cleverest conspiracy of all: art.

JFK is a long and powerful harangue about the death of the man--Stone keeps calling "the slain young king.’ What are the rules of Stone’s game Is Stone functioning as commercial entertainer Propagandist Documentary filmmaker Historian Journalist Fantasist Sensationalist Crazy conspiracy-monger Lone hero crusading for the truth against a corrupt Establishment Answer: some of the above.

The first superficial effect of JFK is to raise angry little scruples like welts in the conscience. Wouldn’t it be absurd if a generation of younger Americans, with no memory of 1963, were to form their ideas about John Kennedy’s assassination from Oliver Stone’s report of it But worse things have happened--including, perhaps, the Warren Commission report

Stone uses a suspect, mixed art form, and JFK raises the familiar ethical and historical problems of docudrama. But so what Artists have always used public events as raw material, have taken history into their imaginations and transformed it. The fall of Troy vanished into the Iliad. The Battle of Borodino found its most memorable permanence in Tolstoy’s imagining of it in War and Peace.

Especially in a world of insatiable electronic storytelling, real history procreates, endlessly conjuring new versions of itself. Public life has become a metaphysical breeder of fictions. Watergate became an almost continuous television miniseries--although it is interesting that the movie of Woodward and Bernstein’s All The President’s Men stayed close to the known facts and, unlike JFK, did not validate dark conjecture.

Shakespeare’s creation is used in the text to introduce()

A.his powerful imaginations

B.artists’ distortion of history

C.his well-established fame

D.historians’ interest in art