20xx年最新電大工程力學(xué)本期末復(fù)習(xí)考試小抄(參考版)
2024-10-18 12:07本頁面
【正文】 an, the starting point of the ancient Silk Road, a trade channel established more than 2,000 years ago linking China, Central Asia and Europe. 。s cooperation with Central Asian countries, a senior official said. Shaanxi Governor Lou Qinjian said the province is fresh, rich and unique, as it was when it anchored one end of the ancient S ilk Road. It is the best option for acmodating industrial transfers from East China or the world at large, he said on Wednesday in Xi39。s business development. Rudy Buttignol, president of the public broadcasting pany in British Columbia, Canada, said his work requires frequent travel to Chengdu and the policy makes the trips easier. Data from the city39。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。s 72hour visafree policy has attracted wide attention from both Chinese and foreign experts and businessmen since it took effect on Sept 1 last year. The program permits citizens from 51 countries and regions including the United States, Australia, Canada and Japan who have valid visas and flight tickets to a third country to spend three days in the city. The capital of Sichuan province is the first city in the western region of China to offer foreign tourists a threeday visa and the fourth nationwide to adopt the policy following Shanghai, Beijing and Guangzhou. Li Zhiyong, deputy dean of the tourism institute at Sichuan University, said the move contributes to a large increase in the number of overseas tourists and raises the city39。已知基本結(jié)構(gòu)如下圖所示，求系數(shù)項(xiàng)和自由項(xiàng)。 EI=常數(shù)。m5 k N 1 0 k N 2 m2 m4m 4 m 參考答案： 1 0 k N Δ1 Δ1= 13 i4 i2 i2 i4 i 1Mk1 1 基本體系 5 k N 2 E IE Ill/2l/2 PF 參考答案： 2 iiΔ1 PF Δ1= 18 i2 i4 i1Mk1 1 4 i 基本體系 F1 PPM8/lFP 8/lFP 8/lFP 用位移法計(jì)算圖示剛架，求出系數(shù) 項(xiàng)及自由項(xiàng)。 作后彎矩圖如圖（ f）所示。 圖（ a）簡化一半剛架如圖（ c）所示。桿件 EI 為常數(shù)。 作后彎矩圖如圖（ c）所示。 llPF PF 參考答案： 利用對稱性結(jié)構(gòu)簡化為如圖（ a）所示。 作后彎矩圖如圖（ d）所示。 1M 圖如圖（ b）所示。mM ( 1 / 32 ) ， EI=常數(shù)。 (2) 列力法方程 011111 ????? Px? (3) 作 1M 圖，見圖（ b） 作 PM 圖，見圖（ c） (4) 計(jì)算 ?1 ?1P EIEIEIEIM 325644413844211d s2111 ??????????? ? ?? EIEIEIdEI MM SPP 311604420201022021111 ?????????????? ? ? 321451 ?x （ kN） X11 0 k NX1= 14 m1M1 0 k N 2 0PM4 m mkN ? （ a） （ b） （ c） (5) 作 M 圖 10 kN290 k N EI=常數(shù)。 （） 42．弱阻尼自由振動是一個衰減振動。 ( )
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