【正文】
D. 5kN16.機動法作靜定梁影響線應(yīng)用的原理為( ) A. 變形條件 B. 平衡條件 C. 虛功原理 D.疊加原理17.在圖示結(jié)構(gòu)中,若要使其自振頻率ω增大,可以( )A.增大P B.增大m C. 增大EI D.增大l18.力法典型方程中的自由項Alp是基本體系在荷載作用下產(chǎn)生的( )A.Xi B.Xj C.Xi方向的位移 D.Xj方向的位移19.一般情況下結(jié)點的不平衡力矩總等于( ) A.匯交于該結(jié)點的固定端彎矩之和 B. 傳遞彎矩之和C. 結(jié)點集中力偶荷載D. 附加約束中的約束力矩20.一結(jié)構(gòu)的超靜定次數(shù)等于結(jié)構(gòu)中( ) A.約束的數(shù)目 B.多余約束的數(shù)目C. 結(jié)點數(shù) D.桿件數(shù)三、計算題(20分)21.用力法計算圖示結(jié)構(gòu),基本體系如下示,求力法方程各系數(shù)和自由項。 ( ) 5.在力矩分配中,當遠端為定向支座時,其傳遞系數(shù)為o。為( ) 5.靜定結(jié)構(gòu)的影響線的形狀特征是( ) 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6.位移法典型方程實質(zhì)上是( ) A. 平衡方程 B.位移條件 C. 物理關(guān)系 D. 位移互等定理7.圖示結(jié)構(gòu)月截面,彎矩等于( ) A.0 B.m上拉 C. D.8.用位移法計算超靜定結(jié)構(gòu)時,其基本未知量為( ) A. 多余未知力 B.桿端內(nèi)力 C. 桿端彎矩 D. 結(jié)點位移 9.力法方程中的系數(shù)代表基本體系在=1作用下產(chǎn)生的( ) A.Xi B. C. Xi方向的位移 D.方向的位移 10.超靜定結(jié)構(gòu)在荷載作用下產(chǎn)生的內(nèi)力與剛度( ) A. 無關(guān) B.相對值有關(guān) C. 絕對值有關(guān) D.相對值絕對值都有關(guān)三、(20分) 用力法計算圖示結(jié)構(gòu),并繪出M圖,El=常數(shù)。( ) 5.用力法計算超靜定結(jié)構(gòu),選取的基本結(jié)構(gòu)不同,所得到的最后彎矩圖也不同。不選、 錯選或多選者,該題無分) 1.用力法計算超靜定結(jié)構(gòu)時,其墓本未知量為( )。 A. 1 B. 2 C. 3 D. 4 A.重力在彈性力內(nèi)考慮了 B.重力與其它力相比,可略去不計C. 以重力作用時的靜平衡位置為y坐標零點 D. 重力是靜力,不在動平衡方程中考慮9.圖示等截面梁的截面極限彎矩M。建立基本結(jié)構(gòu)如圖所示。三、(本題10分)選出圖示結(jié)構(gòu)的力法基本體系,并繪出相應(yīng)的多余約束力。4/73/7MP一2+2—1/2分配、傳遞一3/7—6/7—9/14M一17/78/7—8/7 3分 MF: 4分 分配、傳遞: 4分 M: 4分 彎矩圖: 5分圖示剛架橫梁為剛性桿,重量W:10kN集中在橫粱上,h=4m,EI=5.442104kNm B.56.4kN試題答案及評分標準一、是非題(將判斷結(jié)果填入括?。灰浴瘫硎菊_,以表示錯誤) (本大題共3小題,總計15分)1. 2. 3.二、選擇題(將選中答案的字母填入括號內(nèi))(本大題共3小題,總計 15分)1.A(本題7分) 2.C(本題8分) 三、(本大題15分)計算圖示結(jié)位移法典型方程式中系數(shù)和自由項(各桿的EI為常數(shù))四、(本大題15分)求圖示剛架的力矩分配系數(shù)。Shanghait want to steal food like other mice. Shuke became a pilot and Beita became a tank driver, and the pair met accidentally and became good friends. Then they befriended a boy named Pipilu. With the help of PiPilu, they cofounded an airline named Shuke Beita Airlines to help other animals. Although there are only 13 episodes in this series, the content is very pact and attractive. The animation shows the preciousness of friendship and how people should be brave when facing difficulties. Even adults recalling this animation today can still feel touched by some scenes. Secrets of the Heavenly Book Secrets of the Heavenly Book, (Chinese: 天書奇談)s feud with Nezha over his son39。by Alice Mak and Brian Tse. Although McDull made his first appearances as a supporting character in the McMug ics, McDull has since bee a central character in his own right, attracting a huge following in Hong Kong. The first McDull movie McMug Story My Life as McDull documented his life and the relationship between him and his McMug Story My Life as McDull is also being translated into French and shown in France. In this version, Mak Bing is the mother of McDull, not his father..