【正文】 P$vSTTamp。gTXRm6X4NGpP$vSTTamp。gTXRm6X4NGpP$vSTTamp。 A、Zi B、Zj C、第i個(gè)附加約束中的約束反力D、第j個(gè)附加約束中的約束反力用位移法計(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”。A、增大L B、增大EI C、增大m D、增大P1 圖示體系不計(jì)阻尼的穩(wěn)態(tài)最大動(dòng)位移，其最大動(dòng)力彎矩為：（B）A. 7Pl/3。1圖示各結(jié)構(gòu)中，除特殊注明者外，各桿件EI=常數(shù)。（ ）同一結(jié)構(gòu)的力法基本體系不是唯一的。 （ ）1在多結(jié)點(diǎn)結(jié)構(gòu)的力矩分配法計(jì)算中，可以同時(shí)放松所有不相鄰的結(jié)點(diǎn)以加速收斂速度。（ √ ）2結(jié)構(gòu)的自振頻率與結(jié)構(gòu)的剛度及動(dòng)荷載有關(guān)。（ ）圖示為單跨超靜定梁的力法基本體系，其力法方的系數(shù)為l/EA。（ ）39．位移法典型方程中的主系數(shù)恒為正值，付系數(shù)恒為負(fù)值。參考答案：這是一個(gè)對(duì)稱結(jié)構(gòu)。1. 用力法計(jì)算圖示結(jié)構(gòu)，EI=常數(shù)。 （各桿的 EI 為常數(shù)）。2）列出力法方程圖143）由力的平衡方程求系數(shù)和自由項(xiàng)（圖117）4）求解位移法方程得：圖15基本結(jié)構(gòu)5）用彎矩疊加公式得：圖11圖20圖11圖20圖16圖17圖18圖19例2. 如圖20，繪彎矩圖…. （具有一個(gè)結(jié)點(diǎn)位移結(jié)構(gòu)的計(jì)算）解：只有一個(gè)結(jié)點(diǎn)角位移。在結(jié)點(diǎn)B及結(jié)點(diǎn)E處加兩個(gè)附加約束，如圖27所示。EI=常數(shù)。設(shè)兩跨截面的極限彎矩均為Mu。s largest breeding and research center. Three days are long enough for foreign visitors to visit those iconic tourist spots, he noted. The city is home to the remains of the Jin sha civilization that dates back more than 3,000 years as well as the Qing cheng Mountains and the Du jiang yan irrigation system. Qing cheng has long been recognized as the birthplace of Taoism, China39。動(dòng)力自由度為2。（1）（2）列位移法方程：（3）作圖（4）（5）由M=+得，畫(huà)M圖。EI為常數(shù)。（具有一個(gè)結(jié)點(diǎn)位移結(jié)構(gòu)的計(jì)算）解：結(jié)點(diǎn)A、B、C有相同的線位移，因此只有一個(gè)未知量。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。 3．由圖乘法計(jì)算系數(shù)和自由項(xiàng) 圖14．解方程將上述系數(shù)、自由項(xiàng)代入力法典型方程：解方程組可得： 5．作M圖由疊加公式，見(jiàn)圖1（h）。 參考答案：。（ √ ）3在 溫 度 變 化 與 支 座 移 動(dòng) 因 素 作 用 下，靜 定 與 超 靜 定 結(jié) 構(gòu) 都 有 內(nèi) 力 。（ ）2圖示為剛架的虛設(shè)力系，按此力系及位移計(jì)算公式可求出桿AC的轉(zhuǎn)角。( √ )1圖示體系有5個(gè)質(zhì)點(diǎn)，其動(dòng)力自由度為5（設(shè)忽略直桿軸向變形的影響）。（ ）靜定結(jié)構(gòu)和超靜定結(jié)構(gòu)的內(nèi)力影響線均為折線組成。對(duì)稱剛架在反對(duì)稱荷載作用下的內(nèi)力圖都是反對(duì)稱圖形。 。A、荷載B、線剛度C、近端支承D、遠(yuǎn)端支承1匯交于一剛結(jié)點(diǎn)的各桿端彎矩分配系數(shù)之和等于（ D ）。A、恒大于零B、恒大于零C、恒大于零D、恒大于零位移法典型方程實(shí)質(zhì)上是（ A 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