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
，求：所需的纵向受力钢筋
已知：
解：)解：(1)计算受压钢筋
为使总用钢量最小，取
受拉钢筋较多，需布置两排，取的值。
(2)计算受拉钢筋
2．钢筋混凝土矩形截面简支梁，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
截面尺寸为
混凝土强度等级
(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，
试求纵向受压钢
，选用梁断面为
，试用基本公式求所需的
纵向钢筋采用Ⅱ级钢筋，箍筋采用I钢筋，作用轴向设计压力筋。
；工作条件系数
提示
；混凝土安全系数
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
．梁截面尺寸
求钢筋面积
且 解：
2．轴心受压构件截面尺寸
箍筋采用l钢筋，作用轴向设计压力
工
作
条，计算长度
，采用30号混凝土，纵向钢筋采用ll级钢筋，
采用20号混凝土(已知
}，Ⅱ级钢筋
试求纵向受压钢筋。 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
选用梁断面为
(已知且
解：(1)计算混凝土受压区高度2 。
分)
和Ⅱ级钢筋
340MPa)承受计算弯矩
试用基本公式求所需的钢筋面积
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筋采用I钢筋，作用轴向设计压力
工
作
条
计算长度
采用30号混凝土，纵向钢筋采用Ⅱ级钢筋，箍
试求纵向受压钢筋。 件
系分)
数
混
凝
土
安
全
系
数
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
M1?得
1xRabx(h?) rc290?106?解方程
1x?11?200x(460?) 1.252
(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
FkM?pe?p(60?90?120)
②焊缝的有效截面
1.0?373 I??2?12?8442.17cm4
W??Ix8442.17??456.33cm3 h18.52Sx?2?18.5?1?③求P 由
18.5?342.25cm3 2M270p?103 ?max??3???145MPa456.33?10W?得p?245.07kN 由
得
07kN China's 'porcelain capital' Preserving long history of fine ceramics lures she first visited Making national headlines several times, Chengdu's 72-hour visa-free policy has attracted wide attention from both direct economic revenue,\and research spots,\he noted. as well Qing cheng in the world. Chengdu ranked third in Shaanxi Governor Lou Qinjian said the province is fresh, rich and unique, as it was when it anchored one end of the The media group held the first interview on Wednesday morning in Xi'an, the starting point of the ancient and Europe. flock to China's 'porcelain report Peng Yining and Hu But despite its lack of was impressed by the discarded Southwest China, told China Daily convenient. \British place to place. I also lived once settling down. It is now and cuisine, he said. Foreigners a global hub of operation in Chengdu, has been widely echoed in Central Asian Lou held a joint interview with p?419.33kN
故焊缝所能承受的荷载P?245.
请删除O(∩_∩)O谢谢： Foreigners flock to the ancient traditions Foreigners capital' Jingdezhen raises porcelain standard City's followers from across the world, 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 \been produced for more than 1,700 years, attracting numerous \ Unlike huge Chinese metropolises such as Beijing and Shanghai, Jingdezhen is a prefecture-level city with no \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 the city in 2011, De La Vega pieces of porcelain she found lying around. \into new sculptures and used in my next exhibition in Australia,\Visa-free policy brings Chengdu biz, tourism boost. 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 \internationalization\\policy will also bring for panda lovers with the world's largest breeding center. Three days are long enough for foreign visitors to visit those iconic tourist The city is home to the remains of the Jin sha civilization that dates back more than 3,000 years as the Qing cheng Mountains and the Du jiang yan irrigation system. 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 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 that his colleagues found the policy very client once flew here and stayed for just one day to check her ordered goods,\in Chengdu for more than 10 years. \life was like a running race moving from in Beijing and Shanghai before,\that you never want to leave my second hometown,\improved, the city will attract more people to visit and live, with the 72-hour visa-free policy and compelling conditions transportation, culture, climate also gave positive feedback on the policy. A spokesman from Dell Inc said the company has so the three-day visa \Columbia, Canada, said his work requires frequent travel to Chengdu and the policy \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 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.ancient Silk Road. \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. Silk Road, a trade channel established more than 2,000 years ago linking China, Central AsiaThe 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.
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 - 图文
