xx年电大土木工程力学本科期末重点复习试题考试小抄

xx年电大土木工程力学本科期末重点复习试题考试小抄内容摘要：

M,1 图 （ 4） izRzrRirPP596,06,16511111111 （ 5）由 M= 1M 1z + PM 得 ，画 M图。 解： 只有一个结点角位移，基本结构如图所示 列位移法方程（令 iEI5） 01111  pFk 作 图作 p，MM1 求 11k 、 pF1 ，并求 1 iiiik 1464411  61251 pF EIi 84625841251  作 M图 PMMM  11 7. 用位移法计算图示刚架，画 M图。 EI=常数。 解： 只有一个结点角位移，基本结构如图所示 列位移法方程 01111  pFk 图作 p，MM1 求 11k 、 pF1 ，并求 1 ik 711 4251 pF i28251  作 M图 PMMM  11 ，画 M图。 2 EIBl/2l/2EIAClF P 解： 基本体系如图： 列位移法方程： 01111  pFk 作 PMM,1 图 求 11k 、 pF1 ，并求 1 ik 711 FplF p 1631  EIFpl1603 21  作 M图 PMMM  11 ，并绘弯矩图。 各杆 EI 相同等于常数。 5m16kN/m 2 0 k N2 . 5 m 2 . 5 m 解： 只有一个结点角位移，基本结构如图所示 列位移法方程 01111  pFk 图作 p，MM1 求 11k 、 pF1 ，并求 1 ik 711 121751 pF i841751  作 M图 PMMM  11 注：务必掌握例 3 3 3表 31和 32中的 12以及对称结构的半结构的选取 P58。 判断所示体系的动力自由度。 动力自由度为 2。 动力自由度为 1 一． 求图示两跨连续梁的极限荷载。 设两跨截面的极限弯矩均为 Mu。 只有一个破坏机构，如图所示。 塑性铰 D处的剪力为零。 对 BD段：uuuuB qMxMxqM 2,0221,0 2  对 DC段：  22,0 xl MqM uuC  求解上述两个方程有：  ,22 lMqlx uu  Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。 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 c apital 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。 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 largest breeding and research center. Three days are long enough for foreign visitors to visit those iconic tourist s pots, 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 Taois m, China39。 s ancient indigenous religion, while Du jiang yan is considered to be the oldes t 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 touris m 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 Britis h 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 1 0 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 attract more people to visit and live, with the 72hour visafree policy and pelling conditions in transportation, culture, climate and cuisine, he said. Foreigners also gave positive feedback on the policy. A spokesman from Dell Inc said the pany has a global hub of operation in Chengdu, so the threeday visa has an immediate and positive influence on the pany39。 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 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 2020. Around million came from abroad, an increase of 12 percent. Total revenue from touris m 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 China39。 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 Silk Road. It is the best option for acmodating industrial transfers from East China or the world at large, h。