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《電大土木工程力學(xué)(本)形成性考核冊作業(yè)答案》-預(yù)覽頁

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【正文】 wind, the masses to close, honest and pragmatic people honest image to further establish the foundation to further reinforce the basic level. Style of the building of the new results to promote the construction of a powerful force of the county and the ecological culture of the county and county educational practice activities of the unit is mainly: the county and below county departments under the organs, enterprises and institutions directly under the township, street, and munity, village, nonpublic economic organizations, social organizations and other grassroots organizations. Agencies and branches, each single unit, follow the rules on internal institutions. Educational practice with step by adhere to the county leadership, leadership and leading cadres to focus on outstanding catch to directly contact the service of the masses of law supervision departments and window units, service industry, educational practice, pay attention to grasp the heavy towns, streets and villages, munity education activities and the masses of grassroots groups in close contact to strengthen, and the majority of Party members, cadres and the mass line line Marx doctrine view of the masses and the party39。3.解:顯然,體系是具有兩個多余約束的幾何不變體系。m)2.解: 作彎矩圖如下:ABCDFPLM圖20kN/m40kN2m4mABCD40kN2m2m2mEF3.解: ABCEFD4040120M圖(kN( )2.反力互等定理僅對超靜定結(jié)構(gòu)才有使用價值。( 218。(9分)解:(1)作MP圖ABCMP圖ABC1圖(2)作圖(3)計算C點豎向位移 qC2l/3l/3四、計算圖示剛架結(jié)點C的水平位移和轉(zhuǎn)角,EI=常數(shù)。(9分)解:(1)計算實際荷載作用下桁架各桿的軸力ABCDE40kN40kN80kN90kN100kN50kN60kN60kN50kN100kN(2)計算虛設(shè)單位荷載作用下桁架各桿的軸力ABCDE1(3)計算B點豎向位移 七、確定下列結(jié)構(gòu)的超靜定次數(shù)。m)40 (4)求解多余未知力: (5)作M圖:(40)ABC15M圖(kNABCDX1X2基本結(jié)構(gòu){(2)寫出力法方程如下: δ11 X1+δ12 X2+Δ1P= 0 δ21 X1+δ22 X2+Δ2P= 0(3)計算系數(shù)及自由項:1ABCD4444圖 6kNABCD24MP圖(kN(10分)解:(1)取基本結(jié)構(gòu):ABCDX1X1基本結(jié)構(gòu)(2)寫出力法方程如下:δ11 X1+Δ1P= 0(3)計算系數(shù)δ11及自由項Δ1P作圖和MP圖如下:PABCD6PMP圖ABCD11圖2288 (4)求解多余未知力: (5)作M圖:ABCDM圖十一、利用對稱性計算圖示剛架,并繪制彎矩圖。(218。(218。( 180?;窘Y(jié)構(gòu)ABCΔ1(2)寫出位移法方程如下:k11Δ1+ F1P= 0(3)計算系數(shù)k11及自由項F1P 令,則 iAB =3i, iBC =2i作圖和MP圖如下:2i圖ABC112i6i2iMP圖(kN(10分) 解: (1)選取基本結(jié)構(gòu)如下圖所示,ΔΔ2為基本未知量。m(4)求解位移法基本未知量{ 將系數(shù)及自由項代入位移法方程,得: 20iΔ1+ 4iΔ2+40= 0 4iΔ1 +12iΔ230= 0解得: (5)作M圖EABCDFM圖(kN各桿EI相同且為常數(shù)。m(4)求解位移法基本未知量 將系數(shù)及自由項代入位移法方程,得: (5)作M圖 ABGEM圖(kN(10分)48kN/mABCD6m6m3m24kN3m解:計算分配系數(shù), 分配與傳遞計算分配系數(shù)固端彎矩最后彎矩144單位(kN各桿EI相同且為常數(shù)。m24kN36kN各桿EI相同且為常數(shù)。m)200014固點反力矩0BE分配與傳遞2020 分配與傳遞計算(4)作M圖(32)20EABCD20M圖(kNm)101020EABCDBABCBDCBCEDBEC作M圖EABCD(20)15M圖(kN?。?.圖 示 結(jié) 構(gòu) C 截 面 彎 矩 影 響 線 在 C 處 的 豎 標 為 。?。?.圖示體系有5個質(zhì)點,其動力自由度為5。 )三、畫圖示伸臂梁MK,F(xiàn)RA的影響線。(10分)1m3mDC解: 用機動法作影響線如下:C?MC影響線197。(20分)2m2mAC2m1mB12kN12kN8kN/m解:作FyA、MC影響線如下:AFyA影響線197。LmL解:(1)計算柔度系數(shù)d11(15分)ml/2kEI=∞ααyA對A點取矩,列出體系動力學(xué)平衡方程: 其中:和為慣性力,為彈性力。(15分)EImhEIEIEI1=∞解:取橫梁為研究對象,計算剛度系數(shù)k11由 結(jié)構(gòu)的自振頻率為:
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