電大開放教育土木工程力學(xué)選擇判斷復(fù)習(xí)提綱【按首字母排序-預(yù)覽頁
【正文】 聯(lián)，且三鏈桿平行不等長，則構(gòu)成瞬變體系。 El=常數(shù)。 ● 圖示單自由度動力體系自振周期的關(guān)系為 (A. (a)=(b) )。 ◆圖示結(jié)構(gòu)中， 使體系自振頻率ω 減小，可以 (c. 減小 E1)。 (√ ) ◆圖示結(jié)構(gòu) A 截面彎矩影響線在 A 處的豎標為 1。 (╳ ) ◆圖示結(jié)構(gòu) FyD影響線的 AC 段縱標為零。 (╳ ) ●圖示結(jié)構(gòu)桿件 BC 的 B 端轉(zhuǎn)動剛度 SBC 為 (D. 8) ◆圖示結(jié)構(gòu)的超靜定次數(shù)是 n=3(√ ) ◆圖示結(jié)構(gòu)的超靜定次數(shù)是 n=3。 ● 圖示等截面梁的截面極限彎矩 M}= 120kN (√ ) ◆圖示為剛架的虛設(shè)力狀態(tài)，按此力 狀態(tài)及位移計算公式可求出 A 處的水平位移。 ● 圖示超靜定結(jié)構(gòu)獨立結(jié)點角位移的個數(shù)是 (B3) ●圖示超靜定結(jié)構(gòu)的超靜定次數(shù)是 (C5)。 W 部 ◆位移法的基本結(jié)構(gòu)不是唯一的。 ◆位移法典型方程中的自由 項是外因作用下附加約束上的反力。 (√ ) ● 已知圖示結(jié)構(gòu)力矩分配系數(shù)，則 桿端彎矩 MA1，為 ( 16 kN (√ ) ◆用力矩分配法計算結(jié)構(gòu)時，匯交于每一結(jié)點各桿端分配系數(shù)總是小于 1，所以計算結(jié)果是收斂的。 (√ ) ●用力矩分配法計算時結(jié)點的不平衡力矩等于 ( )。 ◆ 用力法計算超靜定結(jié)構(gòu)，選取的基本結(jié)構(gòu)不同，所得到的最后彎矩圖也不同。 ● 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”。 ◆用力法計算超靜定結(jié)構(gòu)，選取的基本結(jié)構(gòu)不同，所得到的最后彎矩圖也不同。 (√ ) ◆支座移動對超靜定結(jié)構(gòu)的極限荷載沒有影響。 (╳ ) ◆在結(jié)構(gòu)動力計算中，兩質(zhì)點的振動體系，其振動自由度一定為二。 ◆在動力計算中，以下兩圖所示結(jié)構(gòu)的動力自由度相同 (各桿均為無重彈性桿 )。s level of internationalization. The policy will also bring direct economic revenue, Li said. Chengdu has many cultural legacies and is also a paradise for panda lovers with the world39。s public security bureau shows some 100 foreign visitors enjoyed the 72hour policy by the end of March, most of them from the United States, the United Kingdom and Germany. Chengdu also reported robust growth in its overall tourist industry last year. Official statistics show that it received some 150 million tourists last year, an increase of 28 percent from 2021. Around million came from abroad, an increase of 12 percent. Total revenue from tourism surpassed 133 billion yuan ($). During his visit to Kazakhstan in September, Chinese President Xi Jinping proposed that China and Central Asia join hands to build a Silk Road economic belt to boost cooperation. The idea has been widely echoed in Central Asian countries, being an encouraging blueprint for Chinese areas along the Silk Road that has linked Asia and Europe for more than 2,000 years. In the next three weeks, China Daily reporters will travel through the belt in China and in Kazakhstan, Uzbekistan and Turkey. They will show the progress and expectations of the countries, businesses and peoples on the route. Shaanxi the start of the ancient Silk Road has positioned itself as the new starting point for the development of the Silk Road Economic Belt, which will strengthen China
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