20xx年電大土木工程力學(xué)復(fù)習(xí)題小抄-wenkub.com
2025-05-27 18:07 本頁(yè)面
【正文】 ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end.Skydiver preps for the big jumpWhen he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely.If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。s 21 win.Michel Platini, president of European football39。s about how he felt and I would like to speak to him first to find out what his experience was.Uefa hass celebrations said he wanted to meet Ivory Coast international Toure to discuss his plaint.CSKA general director Roman Babaev says the matter has been exaggerated by the Ivorian and the British media.Blatter, 77, said: It has been decided by the Fifa congress that it is a nonsense for racism to be dealt with with fines. You can always find money from somebody to pay them.It is a nonsense to have matches played without spectators because it is against the spirit of football and against the visiting team. It is all nonsense.We can do something better to fight racism and discrimination.This is one of the villains we have today in our game. But it is only with harsh sanctions that racism and discrimination can be washed out of football.The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters).It might not be the moon, but Kittinger free fell from 102,800 feet in 1960 at the dawn of an infamous space race that captured the hearts of many. Baumgartner will attempt to break that record, a feat that boggles the mind. This is one of those monumental moments I will always remember, because there is no way I39。m anxious for the next one: a space capsule hanging from a crane in the New Mexico desert.It39。s note: Judson Jones is a meteorologist, journalist and photographer. He has freelanced with CNN for four years, covering severe weather from tornadoes to typhoons. Follow him on Twitter: jnjonesjr (CNN) I will always wonder what it was like to huddle around a shortwave radio and through the crackling static from space hear the faint beeps of the world39。設(shè)兩跨截面的極限彎矩均為Mu。解：只有一個(gè)結(jié)點(diǎn)角位移，基本結(jié)構(gòu)如圖所示列位移法方程求、并求作M圖 注：務(wù)必掌握例333表31和32中的12以及對(duì)稱結(jié)構(gòu)的半結(jié)構(gòu)的選取P58。EI=常數(shù)。EI為常數(shù)。在結(jié)點(diǎn)B及結(jié)點(diǎn)E處加兩個(gè)附加約束，如圖27所示。2）位移法方程：3）畫(huà)出圖，如圖22，23，根據(jù)節(jié)點(diǎn)力矩平衡（圖24），求得將和代入位移法方程得：4）彎矩疊加方程：得：圖21基本結(jié)構(gòu)固端彎矩剛結(jié)點(diǎn)處彎矩5）畫(huà)出彎矩圖如圖25所示。2）列出力法方程圖143）由力的平衡方程求系數(shù)和自由項(xiàng)（圖117）4）求解位移法方程得：圖15基本結(jié)構(gòu)5）用彎矩疊加公式得：圖11圖20圖11圖20圖16圖17圖18圖19例2. 如圖20，繪彎矩圖…. （具有一個(gè)結(jié)點(diǎn)位移結(jié)構(gòu)的計(jì)算）解：只有一個(gè)結(jié)點(diǎn)角位移。建立基本結(jié)構(gòu)如圖所示。 （各桿的 EI 為常數(shù)）。 解：一次超靜定結(jié)構(gòu)，基本結(jié)構(gòu)如圖列力法方程作求、求,=5作M圖4. 用力法計(jì)算，并繪圖示結(jié)構(gòu)的M圖。1. 用力法計(jì)算圖示結(jié)構(gòu)，EI=常數(shù)。解：圖1（a）所示為一兩次超靜定剛架，圖1（b）、（c）、（d）均可作為其基本結(jié)構(gòu)，比較而言，圖1（d）所示的基本結(jié)構(gòu)比較容易繪制彎矩圖，且各彎矩圖間有一部分不重疊，能使計(jì)算簡(jiǎn)化，故選擇圖1（d）為原結(jié)構(gòu)的基本結(jié)構(gòu)。參考答案：這是一個(gè)對(duì)稱結(jié)構(gòu)。1． 作圖；2．3．用力法計(jì)算圖示結(jié)構(gòu)。（ ）
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