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Pl/3 1在圖示結(jié)構(gòu)中，若要使其自振頻率增大，可以（C）A. 增大P。1下列圖中（A、I均為常數(shù)）動(dòng)力自由度相同的為（ A ）；A．圖a與圖b； B．圖b與圖c；C．圖c與圖d； D．圖d與圖a。1用位移法計(jì)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”。（ ）超靜定次數(shù)一般不等于多余約束的個(gè)數(shù)。（ ）用力法計(jì)算超靜定結(jié)構(gòu)，選取的基本結(jié)構(gòu)不同，則典型方程中的系數(shù)和自由項(xiàng)數(shù)值也不同。（√ ）1圖示結(jié)構(gòu)C截面彎矩影響線在C處的豎標(biāo)為ab/l.（ ）1簡(jiǎn)支梁跨中C截面彎矩影響線的物理意義是荷載作用在截面C的彎矩圖形。（　?。?當(dāng)結(jié)構(gòu)中某桿件的剛度增加時(shí)，結(jié)構(gòu)的自振頻率不一定增大。 （ ）設(shè)直桿的軸向變形不計(jì)，圖示體系的動(dòng)力自由度為4。（ ）2靜定結(jié)構(gòu)的內(nèi)力計(jì)算，可不考慮變形條件。（√ ）29圖示結(jié)構(gòu)的超靜定次數(shù)是n=3。（ ）34．用力法解超靜定結(jié)構(gòu)時(shí)，可以取超靜定結(jié)構(gòu)為基本體系。（ ）38．同一結(jié)構(gòu)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相同。 項(xiàng)，各桿EI 相同。 作M圖用力法計(jì)算圖示結(jié)構(gòu)。圖9解： 求解上述方程得：代入疊加公式得：試用力法計(jì)算圖1所示剛架，并繪制彎矩圖。 用力法計(jì)算圖示結(jié)構(gòu)的彎矩，并繪圖示結(jié)構(gòu)的M圖，EI=常數(shù)。EI=常數(shù)。解：一次超靜定結(jié)構(gòu)，基本結(jié)構(gòu)如圖列力法方程作求、求,作M圖注：務(wù)必掌握例22位移法計(jì)算舉例計(jì)算圖示結(jié)構(gòu)位移法典型方程式中的系數(shù)和自由項(xiàng)。參考答案：只有一個(gè)結(jié)點(diǎn)角位移。1）建立基本結(jié)構(gòu)如圖15所示。1）建立基本結(jié)構(gòu)如圖21所示。（具有兩個(gè)結(jié)點(diǎn)位移結(jié)構(gòu)的計(jì)算）解：1）此結(jié)構(gòu)有兩個(gè)結(jié)點(diǎn)位移，即結(jié)點(diǎn)B的角位移及結(jié)點(diǎn)E的水平線位移。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(xiàng)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(jì)算圖示結(jié)構(gòu)位移法典型議程式中系數(shù)r12和自由項(xiàng)R1p（各桿的EI為常數(shù)）用位移法作圖示結(jié)構(gòu)M圖。解：只有一個(gè)結(jié)點(diǎn)角位移，基本結(jié)構(gòu)如圖所示列位移法方程（令）作求、并求作M圖 7. 用位移法計(jì)算圖示剛架，畫M圖。各桿EI相同等于常數(shù)。 動(dòng)力自由度為1一． 求圖示兩跨連續(xù)梁的極限荷載。對(duì)BD段： 對(duì)DC段： 求解上述兩個(gè)方程有： Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。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 att