【正文】 對BD段： 對DC段： 求解上述兩個方程有： Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。各桿EI相同等于常數(shù)。圖27基本體系圖28 圖29令圖31 圖30將求得的各系數(shù)及自由項代入位移法方程圖324）彎矩疊加公式為：利用彎矩疊加公式求得各控制截面彎矩為：計算圖示結構位移法典型議程式中系數(shù)r12和自由項R1p（各桿的EI為常數(shù)）用位移法作圖示結構M圖。1）建立基本結構如圖21所示。參考答案：只有一個結點角位移。EI=常數(shù)。圖9解： 求解上述方程得：代入疊加公式得：試用力法計算圖1所示剛架，并繪制彎矩圖。 項，各桿EI 相同。（ ）34．用力法解超靜定結構時，可以取超靜定結構為基本體系。（ ）2靜定結構的內(nèi)力計算，可不考慮變形條件。（　?。?當結構中某桿件的剛度增加時，結構的自振頻率不一定增大。（ ）用力法計算超靜定結構，選取的基本結構不同，則典型方程中的系數(shù)和自由項數(shù)值也不同。1用位移法計算剛架，常引入軸向剛度條件，即“受彎直桿在變形后兩端距離保持不變”。 D. Pl/3 1在圖示結構中，若要使其自振頻率增大，可以（C）A. 增大P。 A、直線段組成B、曲線段組成C、直線曲線混合D、變形體虛位移圖圖示結構某截面的影響線已做出如圖所示，其中豎標yc，是表示（ C ）。3Q3vdWe3YXvbJr電大本科土木工程力學期末考試復習題一一、 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