電大《土木工程力學(xué)(本)》作業(yè)3

1、 土木工程力學(xué)（本）形成性考核冊 作業(yè)三一、選擇題（每小題2分，共10分）1靜定結(jié)構(gòu)的影響線的形狀特征是（a ）a 直線段組成 b 曲線段組成c 直線曲線混合 d 變形體虛位移圖2 圖示結(jié)構(gòu)某截面的影響線已做出如下圖所示，其中豎標(biāo)yc是表示（c ）a p=1在e時，c截面的彎矩值 b p=1在c時，a截面的彎矩值c p=1在c時，e截面的彎矩值 d p=1在c時，d截面的彎矩值3繪制任一量值的影響線時，假定荷載是（a）a一個方向不變的單位移動荷載 b移動荷載 c動力荷載 d可動荷載4在力矩分配法中傳遞系數(shù)c與什么有關(guān)（ d ）a 荷載 b 線剛度 c 近端支承 d 遠端支承5匯交于一剛結(jié)點的各

2、桿端彎矩分配系數(shù)之和等于（ a ）a 1 b 0 c 1/2 d -1二、判斷題（每小題2分，共10分）1靜定結(jié)構(gòu)和超靜定結(jié)構(gòu)的內(nèi)力影響線均為折線組成 。（）2圖 示 結(jié) 構(gòu) c 截 面 彎 矩 影 響 線 在 c 處 的 豎 標(biāo) 為 。（ ）3簡支梁跨中c 截面彎矩影響線的物理意義是荷載作用在截面c 的彎矩圖形。（）4在多結(jié)點結(jié)構(gòu)的力矩分配法計算中，可以同時放松所有不相鄰的結(jié)點以加速收斂速度。（ ）5力矩分配法適用于連續(xù)梁和有側(cè)移剛架。（ ）四、1）用力矩分配法計算圖示結(jié)構(gòu)，并繪出彎矩圖。各桿ei相同且為常數(shù)。48kn/mabcd6m6m3m24kn3m（10分）1.）解：計算分配系數(shù)， 分

3、配與傳遞計算0.429分配系數(shù)固端彎矩最后彎矩144單位（knm）-82.8982.86分配與傳遞0.57100-14461.780.090-100.85100.85-0.6000.4290.5710-2782.2241.11-67.83-90.28-45.1425.7719.3712.89-7.36-5.53-3.681.582.101.05-0.45-0.300.130.17-0.05-0.04-0.03abcd82.86100.85(216)m圖（knm）作m圖。2）、用力矩分配法計算圖示結(jié)構(gòu)，并繪出彎矩圖。各桿ei相同且為常數(shù)。10分）8kn/mabcd6m6m3m32kn3m3me2

4、4knm解：梁的懸臂 de 為一靜定部分，可求得 mde =-36knm，fqde = 24kn。將結(jié)點 d 簡abcd6m6m3m32kn3m24knm24kn36knm化為鉸支端，則 mde 與 fqde 應(yīng)作為外力作用于結(jié)點 d 右側(cè)，因此可按下圖計算：計算分配系數(shù) 分配與傳遞計算0.5分配系數(shù)固端彎矩最后彎矩單位（knm）5.07分配與傳遞0.50360120.04-12.4512.45-0.13360.4290.5710-186.853.43-1.720.490.370.25-0.86-0.010.02-0.07固點反力矩-24012665.15-1.72-0.86-0.13-0.0

5、70.03-0.0110.1413.84m圖（knm）(48)5.07abcde10.1413.8412.4536（4）作m圖五1）、用力矩分配法計算圖示結(jié)構(gòu)，并繪出彎矩圖。各桿ei相同且為常數(shù)。10分）10kn/m10kn32kneabcd2m2m2m2m4m10kn32knebc2m2m4m20kn20knm20knm解：此剛架可按下圖計算：計算分配系數(shù) ebc分配系數(shù)固端彎矩最后彎矩單位（knm）2000.4290.5710-14-2.57固點反力矩0-3.43be分配與傳遞20-1.72-16.5720-3.43-1.72 分配與傳遞計算（4）作m圖16.57(32)1.7220eab

6、cd203.43m圖（knm）10kn/m20kneabcd4m2m2m4m2)、用力矩分配法計算圖示結(jié)構(gòu)，并繪出彎矩圖。各桿ei相同且為常數(shù)。10分）解：計算分配系數(shù) 單位（knm）100.2730.5-10-2.7320eabcd0.3640.364babcbd0.5cbce-3.64-3.64-1.82-4.09-4.09-2.050.560.750.750.38-0.19-0.19-0.100.030.040.040.02-0.01-0.01db4.29-4.29ec17.86-2.85-15.0待添加的隱藏文字內(nèi)容2-1.820.380.02-1.42-2.05-0.10-2.15分

7、配與傳遞計算作m圖eabcd17.86(20)4.29152.15m圖（knm）(20)4.292.851.42 七、畫圖示伸臂梁，fra的影響線。（10分）abcra 影響線mk 影響線10. 5+2m2m2mk11八、作圖示靜定梁的影響線（5分）九、繪制伸臂梁c截面、d截面的彎矩影響線和剪力影響線。（10分）1m3m0.5mabk0.5m1.5mababababmc影響線qc影響線md影響線qd影響線d3/43/83/41/43/81+if we dont do that it will go on and go on. we have to stop it; we need the co

8、urage to do it.his comments came hours after fifa vice-president jeffrey webb - also in london for the fas celebrations - said he wanted to meet ivory coast international toure to discuss his complaint.cska general director roman babaev says the matter has been exaggerated by the ivorian and the bri

9、tish 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

10、 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 island

11、s-based webb, the head of fifas anti-racism taskforce, is in london for the football associations 150th anniversary celebrations and will attend citys premier league match at chelsea on sunday.i am going to be at the match tomorrow and i have asked to meet yaya toure, he told bbc sport.for me its ab

12、out how he felt and i would like to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedings against cskafor the racist behaviour of their fans duringcitys 2-1 win.michel platini, president of european footballs governing body, has also ordered an immediate inve

13、stigation into the referees actions.cska said they were surprised and disappointed by toures complaint. in a statement the russian side added: we found no racist insults from fans of cska.baumgartner the disappointing news: mission aborted.the supersonic descent could happen as early as sunda.the we

14、ather plays an important role in this mission. starting at the ground, conditions have to be very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. the balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where o

15、ur day-to-day weather lives. it will climb higher than the tip of mount everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and into the stratosphere. as he crosses the boundary layer (called the tropopause),e can e

16、xpect a lot of turbulence.the balloon will slowly drift to the edge of space at 120,000 feet ( then, i would assume, he will slowly step out onto something resembling an olympic diving platform.below, the earth becomes the concrete bottom of a swimming pool that he wants to land on, but not too hard

17、. still, hell 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

18、. 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 completely.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 its not needed. instead, he plans to deploy his 270-square-foot (25-square-meter) main chute at an altitude of around 5,000 feet (1,524 meters).in order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). he will have a reserve pa