2014电大混凝土结构设计原理期末复习计算题考试资料参考小抄.doc

电大混凝土结构设计原理期末复习计算题考试资料小抄
1．已知钢筋混凝土矩形截面梁，采用20号混凝土(R。- llMPa)和Ⅱ级钢筋(Rg=

1.解：(1)计算混凝土受压区高度z
由
则有效高度

由

得

1．钢筋混凝土梁截面尺寸6—200ram，h=450ram，混凝土C30，钢筋采用HRB335级，环
境类别为一类。梁承担的弯矩设计值受拉钢筋较多，需布置两排，取
，求：所需的纵向受力钢筋的值。
已知：

解：)解：(1)计算受压钢筋为使总用钢量最小，取

(2)计算受拉钢筋

2．钢筋混凝土矩形截面简支梁，截面尺寸为混凝土强度等级
为C25，箍筋为HRB335

仅配箍筋

试求出该梁斜截面所能承
受的均布荷载设计值q。
已知：

解：(1)计算简支梁所能承担的剪力

(2)该梁斜截面所能承受的均布荷载设计值q

则

1．已知钢筋混凝土矩形截面梁，采用25号混凝土
和Ⅱ级钢筋
1承受计算弯矩，选用梁断面为，试用基本公式求所需的
钢筋面积A9．

提示

解：(1)计算混凝土受压区高度z
由

则有效高度

由

得

(大于梁高，舍)
解方程得

(2)计算受拉钢筋截面面积
Ag由

2．轴心受压构件截面尺寸，计算长度采用30号混凝土，
纵向钢筋采用Ⅱ级钢筋，箍筋采用I钢筋，作用轴向设计压力试求纵向受压钢
筋。
；工作条件系数；混凝土安全系数
提示

解：(1)计算钢筋混凝土构件的纵向弯曲系数
计算

，查表得

(2)计算纵筋面积

(3)配筋率验算

可以
故受压纵筋最小配筋率，满足要求。
1．已知钢筋混凝土矩形截面梁，承受计算弯矩采用20号混凝土}，Ⅱ级钢筋．梁截面尺寸求钢筋面积(已知

且

解：
2．轴心受压构件截面尺寸，计算长度，采用30号混凝土，纵向钢筋采用ll级钢筋，箍筋采用l钢筋，作用轴向设计压力试求纵向受压钢筋。
工作条件系数混凝土安全系数

解：

1．已知钢筋混凝土矩形截面梁，采用25号混凝土和Ⅱ级钢筋340MPa)承受计算弯矩选用梁断面为试用基本公式求所需的钢筋面积
(已知
且分)
解：(1)计算混凝土受压区高度2 。
由
则有效高度
由
得
解方程得
分)
(2)计算受拉钢筋截面面积

由
分)

2．轴心受压构件截面尺寸计算长度采用30号混凝土，纵向钢筋采用Ⅱ级钢筋，箍筋采用I钢筋，作用轴向设计压力试求纵向受压钢筋。
工作条件系数混凝土安全系数分)

解：

(1)计算钢筋混凝土构件的纵向弯曲系数够
计算

查表得

(2)计算纵筋面积

(3分)
分)
(3)配筋率验算

可以
故受压纵筋最小配筋率，满足要求。(2分)

1．已知钢筋混凝土矩形截面梁，采用20号混凝土(R。一llMPa)和Ⅱ级钢筋(R9一340MPa)承受计算弯矩Mi--90kN·In，选用梁截面为20cmX 50cm。试用基本公式求所需的钢筋面积Ag(设a=40mm，毛。=0．55，7。一丫。一1．25，p。；。=0．10％)。
1．解：
(1)计算混凝土受压区高度X由a=40mm
则有效高度ho=500--40=460mm
由

得

解方程

(2)计算受拉钢筋截面面积Ag
由AgRg=R。6z

2．一连接的构造如图所示，两块A板用对接焊缝与立柱焊连，8板与A板用8个高强螺栓连接。构件钢材为A3钢，其容许应力为[d]一140MPa，o。]一145MPa，[r]一85MPa。设对接焊缝的强度与母材相同，不设引弧板。试求焊缝连接所能承受的荷载P。

2．解：
扣除两端的缺陷，焊缝的有效截面如右图所示。
①受力分析：剪力Q—PkN

②焊缝的有效截面

③求P
由

得
由

得

故焊缝所能承受的荷载

请删除O(∩_∩)O谢谢： Foreigners flock to China's 'porcelain capital' Preserving the ancient traditions Foreigners flock to China's 'porcelain capital' Jingdezhen raises porcelain standard City's long history of fine ceramics lures followers from across the world, report Peng Yining and Hu Kaiyong in Jingdezhen, Jiangxi province. Dressed in paint-stained coveralls, China De La Vega easily navigated the maze of alleyways running alongside a ceramics factory in Jingdezhen, Jiangxi province.
The 31-year-old Australian potter and painter wound her way through armies of one-meter-high ceramic Buddhas and piles of porcelain shards while nodding greetings to the workers and residents. She said the locals are used to seeing foreigners in Jingdezhen, China's "porcelain capital", where fine ceramics have been produced for more than 1,700 years, attracting numerous "porcelain pilgrims" from across the globe. Unlike huge Chinese metropolises such as Beijing and Shanghai, Jingdezhen is a prefecture-level city with no "bar streets" or international stores that are popular among expatriates. But despite its lack of Western chain stores, Jingdezhen is one of the most international cities in inland China, with ceramic studios owned by foreigners dotting the streets, the surrounding countryside and even remote mountaintops. When she first visited the city in 2011, De La Vega was impressed by the discarded pieces of porcelain she found lying around. "I dug out many pieces from the soil around the ceramics works - all the old Buddha heads, hands and feet, which I rebuilt into new sculptures and used in my next exhibition in Australia," she said. "I love this place because the process of making ceramics is a very peaceful one." Visa-free policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu's 72-hour visa-free 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 three-day 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 city'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 world'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, China's ancient indigenous religion, while Du jiang yan is considered to be the oldest functioning water-control 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 attract more people to visit and live, with the 72-hour visa-free policy and compelling conditions in transportation, culture, climate and cuisine, he said. Foreigners also gave positive feedback on the policy. A spokesman from Dell Inc said the company has a global hub of operation in Chengdu, so the three-day visa "has an immediate and positive influence on the company's business development". Rudy Buttignol, president of the public broadcasting company in British Columbia, Canada, said his work requires frequent travel to Chengdu and the policy "makes the trips easier". Data from the city's public security bureau shows some 100 foreign visitors enjoyed the 72-hour 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 2012. Around 1.7 million came from abroad, an increase of 12 percent. Total revenue from tourism surpassed 133 billion yuan ($21.7billion). 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, becoming 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'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 accommodating industrial transfers from East China or the world at large," he said on Wednesday in Xi'an. Lou held a joint interview with 27 media, including China Daily, the first in a series of interviews entitled Chinese Media Along the Silk Road. The interviews will be in Shaanxi and Gansu provinces and the Xinjiang Uygur autonomous region, as well as Kazakhstan, Uzbekistan and Turkey. The media group held the first interview on Wednesday morning in Xi'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.
The pursuit of beauty is a common goal for most women, whether they live in the modern world today or in the modest times of the past. The pursuit of beauty is also a life-long journey, something that demands pe rseverance and commitment.
Summer is here, and so are the hot temperatures, humid air and harmful UV rays. Most Chinese women perfer fairer complexions, which means they have to do more work to stay beautiful during the hottest time of the year.
However, without SPF50 sunscreens and air conditioned rooms, how did women in ancient China cope with the heat and remain beauty-conscious?  In this article, you'll discover that aside from today's botox and face lifts, there are much more that ancient wisdom has to offer.