电大《土木工程力学(本)》作业3

1、专业好文档 土木工程力学（本）形成性考核册 作业三一、选择题（每小题2分，共10分）1静定结构的影响线的形状特征是（a ）a 直线段组成 b 曲线段组成c 直线曲线混合 d 变形体虚位移图2 图示结构某截面的影响线已做出如下图所示，其中竖标yc是表示（c ）a p=1在e时，c截面的弯矩值 b p=1在c时，a截面的弯矩值c p=1在c时，e截面的弯矩值 d p=1在c时，d截面的弯矩值3绘制任一量值的影响线时，假定荷载是（a）a一个方向不变的单位移动荷载 b移动荷载 c动力荷载 d可动荷载4在力矩分配法中传递系数c与什么有关（ d ）a 荷载 b 线刚度 c 近端支承 d 远端支承5汇交于一

2、刚结点的各杆端弯矩分配系数之和等于（ a ）a 1 b 0 c 1/2 d -1二、判断题（每小题2分，共10分）1静定结构和超静定结构的内力影响线均为折线组成 。（）2图 示 结 构 c 截 面 弯 矩 影 响 线 在 c 处 的 竖 标 为 。（ ）3简支梁跨中c 截面弯矩影响线的物理意义是荷载作用在截面c 的弯矩图形。（）4在多结点结构的力矩分配法计算中，可以同时放松所有不相邻的结点以加速收敛速度。（ ）5力矩分配法适用于连续梁和有侧移刚架。（ ）四、1）用力矩分配法计算图示结构，并绘出弯矩图。各杆ei相同且为常数。48kn/mabcd6m6m3m24kn3m（10分）1.）解：计算分配

3、系数， 分配与传递计算0.429分配系数固端弯矩最后弯矩144单位（knm）-82.8982.86分配与传递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图（knm）作m图。2）、用力矩分配法计算图示结构，并绘出弯矩图。各杆ei相同且为常数。10分）8kn/mabcd6m6m3m32kn3

4、m3me24knm解：梁的悬臂 de 为一静定部分，可求得 mde =-36knm，fqde = 24kn。将结点 d 简abcd6m6m3m32kn3m24knm24kn36knm化为铰支端，则 mde 与 fqde 应作为外力作用于结点 d 右侧，因此可按下图计算：计算分配系数 分配与传递计算0.5分配系数固端弯矩最后弯矩单位（knm）5.07分配与传递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固点反力矩-24012665.15-1.72-0.86-0.1

5、3-0.070.03-0.0110.1413.84m图（knm）(48)5.07abcde10.1413.8412.4536（4）作m图五1）、用力矩分配法计算图示结构，并绘出弯矩图。各杆ei相同且为常数。10分）10kn/m10kn32kneabcd2m2m2m2m4m10kn32knebc2m2m4m20kn20knm20knm解：此刚架可按下图计算：计算分配系数 ebc分配系数固端弯矩最后弯矩单位（knm）2000.4290.5710-14-2.57固点反力矩0-3.43be分配与传递20-1.72-16.5720-3.43-1.72 分配与传递计算（4）作m图16.57(32)1.72

6、20eabcd203.43m图（knm）10kn/m20kneabcd4m2m2m4m2)、用力矩分配法计算图示结构，并绘出弯矩图。各杆ei相同且为常数。10分）解：计算分配系数 单位（knm）100.2730.5-10-2.7320eabcd0.3640.364babcbd0.5cbce-3.64-3.64-1.82-4.09-4.09-2.050.560.750.750.38-0.19-0.19-0.100.030.040.040.02-0.01-0.01db4.29-4.29ec17.86-2.85-15.0-1.820.380.02-1.42-2.05-0.10-2.15分配与传递计算

7、作m图eabcd17.86(20)4.29152.15m图（knm）(20)4.292.851.42 七、画图示伸臂梁，fra的影响线。（10分）abcra 影响线mk 影响线10. 5+2m2m2mk11八、作图示静定梁的影响线（5分）九、绘制伸臂梁c截面、d截面的弯矩影响线和剪力影响线。（10分）1m3m0.5mabk0.5m1.5mababababmc影响线qc影响线md影响线qd影响线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 courage

8、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 british m

9、edia.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 v

10、isiting 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 islands-base

11、d 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 about ho

12、w 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 investigat

13、ion 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 weather

14、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 our day

15、-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 expect

16、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. stil

17、l, 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. like

18、 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