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有( D ) A. 荷載作用與溫度變化 B. 支座位移 C. 制造誤差 D. 以上四種原因 5.結(jié)構(gòu)位移計(jì)算公式利用什么原理推導(dǎo)的: ( C ) A. 位移互等原理 B. 虛位移原理 C. 虛功原理 D. 反力互等原理 6.機(jī)動法作靜定梁影響線的理論依據(jù)是 ( B ) A. 虛力原理 B. 虛位移原理 C. 位移互等定理 D. 疊加原理 7.機(jī)動法作靜定梁影響線應(yīng)用的原理為 ( C ) A. 變形體虛功原理 B. 互等定理 C.剛體虛功原理 D.疊加原理 8. 根據(jù)影響線的定義,圖示懸臂梁 A截面的剪力影響線在 B點(diǎn)的縱坐標(biāo)為 ( A ) A. 1 B. 4 C. 4 D. 1 A4 mB1?PF 9.簡支梁某截面 K 彎矩影響縱坐標(biāo) yK的物理意義是( C )。 A.初相角 B.初位移 C.自振頻率 D.振幅 ,體系自由度數(shù) N與質(zhì)點(diǎn)個數(shù) M ( D ) A.總是相等 B. N 總是大于 M C. M 總是大于 N D.不確定 22.圖示簡支梁中間截面的彎矩為( A ) ql A. 82ql B. 42ql C. 22ql D. 2ql 23.一般情況下結(jié)點(diǎn)的不平衡力矩等于( D ) A. 固端彎矩 B. 傳遞彎矩 C. 分配彎矩 D. 附加剛臂中的約束反力矩 24.用力矩分配法計(jì)算結(jié)構(gòu)得到一個收斂的結(jié)果,是因?yàn)椋? C )。 PF PF PF PF PF PF A B C D ( C ) A. 彎矩圖反對稱 B. 軸力圖反對稱 C. 剪力圖反對稱 D. 剪力圖正對稱 二、 判斷題參考答案 ,按此力狀態(tài)及位移計(jì)算公式可求出 A處的轉(zhuǎn)角。 ( √ ) 9. 支座 移動 時靜定結(jié)構(gòu)發(fā)生的是剛體位移。 ( √ ) 。 ( ) 25.超靜定結(jié)構(gòu)由于支座位移可以產(chǎn)生內(nèi)力。 ( √ ) P =1A B C DE 33.靜定結(jié)構(gòu)彎矩影響線是由直線段組成的。 ( √ ) 41.由于弱阻尼,結(jié)構(gòu)的自由振動不會衰減。 lllPF 參考答案: 基本體系及未知量如圖( a)所示。 PF PF lFPlFP ( a) ( b) PF PFlFP lFP lFPlP ( c) 力法解圖示結(jié)構(gòu),并作彎矩圖。 EI=常數(shù)。 ll/2l/2E I= ∞E I E IP 影 影 影 影 參考答案: 6 i/l6 i/l 6 i/l6 i/l 8/lFP 8/lFP 8/lFP 1M PM 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。an. Lou held a joint interview with 27 media, including China Daily, the first in a series of interviews entitled Chinese Media A long 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 bor