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電大(本科)土木工程力學形成性考核答案資料小抄-wenkub.com

2025-05-30 02:37 本頁面
   

【正文】 an. Lou held a joint interview with 27 media, including China Daily, the first in a series of interviews entitled Chinese Media Along the Silk Road. The interviews will be in Shaanxi and Gansu provinces and the Xinjiang Uygur autonomous region, as well as Kazakhstan, Uzbekistan and Turkey. The media group held the first interview on Wednesday morning in Xi39。s ancient indigenous religion, while Du jiang yan is considered to be the oldest functioning watercontrol project in the world. Chengdu ranked third in tourist facilities, management and services among 60 Chinese cities in a customer satisfaction survey released last year. But, Li added that efforts are still needed to develop more tourism products, improve English services and provide accurate translation of traffic signs and scenic billboards. Zhao Yun, chairwoman of British Chamber of Commerce Southwest China, told China Daily that his colleagues found the policy very convenient. A British client once flew here and stayed for just one day to check her ordered goods, she said. Zhao was born in Shanxi province, but she has lived in Chengdu for more than 10 years. My life was like a running race moving from place to place. I also lived in Beijing and Shanghai before, she said. But Chengdu is a place that you never want to leave once settling down. It is now my second hometown, she said. If the environment is further improved, the city will attract more people to visit and live, with the 72hour visafree policy and pelling conditions in transportation, culture, climate and cuisine, he said. Foreigners also gave positive feedback on the policy. A spokesman from Dell Inc said the pany has a global hub of operation in Chengdu, so the threeday visa has an immediate and positive influence on the pany39。 ll/2l/2EI=∞EI EIPF 常 常 常 常 參考答案: 6i/l6i/l 6i/l6i/l 1M 8/lFP 8/lFP 8/lFPPM 典型方程 01111 ??? PFk 211 /24 lik ? 2/1 PP FF ?? Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。mF1P P lEIi? 典型方程 01111 ??? PFk ik 1111? mkN51 ???PF 用位移法計算圖示連續(xù)梁,列出位移法方程,求出系數(shù)項和自由項。 EI=常數(shù)。 一半剛架彎矩圖如圖( d)所示。 PF lFP ( a) ( b) P PFlF lllP ( c) 力法解圖示結構,并作彎矩圖。 X1 ( a)基本體系 X1=1ll PFlFP2 ( b) 1M ( c) PM 68F( d) M 圖( lFP /7) 01111 ??? PX? EIl 3/7 311 ?? , EIPlP /2 31 ??? 7/61 PFX ? 用力法計算圖示結構,并畫 M 圖, EI=常數(shù)。 lll 參考答案: 基本體系及未知量如圖( a)所示。 10kN 2m2m4m 參考答案: (1) 一次超靜定,基本體系和基本未知量,如圖( a)所示。( √ ) 41.由于弱阻尼,結構的自由振動不會衰減。( ) ll2 E IE I E I2 E IE IPF ( a) ( b) 37.在結構動力計算中,兩質點的振動體系,其振動自由度一定為 2。( √ )P =1A B C DE 4 33.靜定結構彎矩影響線是由直線段組成的。( ) 29.在力矩分配法中,當遠端為定向支座時,其傳遞系數(shù)為 1。( ) 25.超靜定結構由于支座位移可以產生內力。( √ ) 21.力法典型方程的等號右端項不一定為 0。 ( √ ) 。(√) 13. 靜定多跨梁中基本部分、附屬部分的劃分與 桿件 的 剛度有 關 。( √ ) 9. 支座 移動 時靜定結構發(fā)生的是剛體位移。( ) qAlB q l 5.桁架結構在結點荷載作用下,桿內只有剪力。( ) 判斷題參考答案 ,按此力狀態(tài)及位移計算公式可求出 A 處的轉角。 ( ) 82.弱阻尼自由振動是一個衰減振動。( √ ) EI= ∞ 78.結構的自振 頻率與質量、剛度及荷載有關。 (√ ) A B Fy A + Fy Bl a b C lab1?P 74.一般情況下,振動體系的振動自由度與超靜定次數(shù)無關。( √ ) 70.圖示結構 A 截面剪力影響線在 B 處的豎標為 1。( √ ) 66.靜定結構的內力和反力影響線是直線或者折線組成。( ) BCA ii mkN?30 62.分配系數(shù) AB? 表示 A 節(jié)點作用單位力偶時, AB 桿 A 端所分擔得的桿端彎矩。( ) 58.能用位移法計算的結構就一定能用力矩分配法計算。( √ ) 54.在力矩分配法中,結點各桿端分配系數(shù)之和恒等于 1。( ) 50.力矩分配法適用于連續(xù)梁和有側移剛架。( ) 1?AB i 46.下圖所示結構中兩支座彎矩的關系是 BA MM ? 。( √ ) 42. 位移法典型方程中的自由項是外因作用下附加約束上的反力。( √ ) 39.位移法的基本方程使用的是平衡條件,該方法只適用于解超靜定結構。( √ ) 35.溫度改變對超靜定結構不產生內力和反力。( √ ) 31.在力法計算時,多余未知力由位移條件來求,其他未知力由平衡條件來求 。( ) 27. 超靜定結構的內力狀態(tài)與 剛度 有關 。( √ ) 23.在荷載作用下,超靜定結構的內力分布與各桿剛度的絕對值 有關。( √ ) 19.同一結構選不同的力法基本體系所得到的力法方程代表的位移條件不同。( ) 16.支座位移引起的超靜定結構內力,與各桿剛度的相對值有關。( ╳ ) 112.圖示結構有兩次超靜定。( √ ) F PA B CD8.用平衡條件能求出全部內力的結構是靜定結構。( √ ) m m BA333.圖示多跨靜定梁僅 FD段有內力。 C.多余約束處的位移協(xié)調條件 37.力法典型方程中的系數(shù) ij? 代表基本結構在( C)。 D.附加剛臂中的約束反力矩 26.圖示結構桿件 BC 的 B 端轉動剛度 BCS 為
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