電大《結(jié)構(gòu)設(shè)計原理》復(fù)習題參考答案小抄【電大結(jié)構(gòu)設(shè)計原理期末復(fù)習專用資料(文件)
【正文】 n, 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 s ettling 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。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 Xi39。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 w idely 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 w ill travel through the belt in China and in Kazakhstan, Uzbekistan and Turkey. They w ill 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, w hich will strengthen China39。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。( 39。 1） hw/b=465/250=4 = 1 250 465 ＝ 279000N150 kN 截面尺寸滿足要求 2） λ=3, 取 λ=3 (λ+1) bhoft = 250 465 (3+1)＝ 56000N=56kN150 kN 需要計算配箍 取 S=100mm200mm,可以 （ 15 分） 某矩形截面柱，其尺寸 b h=300 500mm,已知構(gòu)件承受的 N=1000 kN,M＝ 220kN 39。 m 作用，試復(fù)核截面安全否 101 0 0639。 6. 已知 等肢角鋼 2∠ 80?8 與節(jié)點板連接，節(jié)點板厚 10mm，采用側(cè)焊縫連接，鋼材為 Q235 鋼，焊條為 E43，手工焊， 85f MPa?????? ，設(shè)計軸力 N=1000kN，試進行焊縫設(shè)計。 NN （相關(guān)公式： 001 / he??? ； hl02 ??? ） 4．截面尺寸為 250 400bh? ? ? 的鋼筋混凝土矩形截面梁，采用 C25 混凝土， HRB335 鋼筋， /cdf N mm? ， 2280 /sdf N mm? ，Ⅰ類環(huán)境條件，安全等級為一級，最大彎矩組合設(shè)計值 150dM KNm??,驗算是否需要配受壓鋼筋 ,若需要，試求鋼筋截面面積 sA和 39。 17． 影響鋼筋混凝土構(gòu)件裂縫寬度的主要因素有哪些？ 答： 鋼筋應(yīng)力σ ss、鋼筋直徑 d、配筋率ρ、保護層厚度 c、鋼筋外形、荷載作用性質(zhì)（短期、長期、重復(fù)作用）、構(gòu)件受力性質(zhì)（受彎、受拉、偏心受拉等） 四 、 計算 題 1. 已知某矩形截面簡支梁，截面尺寸為 200 400mm，采用 C25 砼， HRB335 級縱向受力鋼筋，已知 fcd= N/mm2， fsd=280N/mm2， ρmin =%， a’s=as=40mm，配有受拉鋼筋 3ф25， As=1473 mm2，受壓鋼筋 2ф14， As’=402 mm2， ξb=，要求承受彎距設(shè)計值 M＝ 作用，試 復(fù)核截面安全否。（ 3）耐久性。具體說來，結(jié)構(gòu)應(yīng)具有以下幾項功能： （ 1）安全性。 13．焊縫按構(gòu)造劃分有哪兩種形式？各自有什么優(yōu)缺點？ 焊縫按構(gòu)造 可分為對接焊縫和角焊縫兩種形式，對接焊縫用料省，傳力平順，應(yīng)力集中小，疲勞強度高，承受動荷載性能好，但截面要開坡口，制作較費事。盡量使焊縫對稱于構(gòu)件截面的中心軸；焊縫尺寸要適當。 混凝土的應(yīng)力條件是影響徐變的非常重要的因素。鋼筋混凝土構(gòu)件不應(yīng)低于 C20，用 HRB400、 KL400級鋼筋配筋時，不應(yīng)低于 C25；預(yù)應(yīng)力混凝土構(gòu)件不應(yīng)低于 C40 9． 什么是混凝土的徐變？影響徐變的因素有哪些？ 答： 混凝土徐變是指混凝土在應(yīng) 力不變時 ,其應(yīng)變隨時間而持續(xù)增長的特性。 7. 高強螺栓如何傳遞內(nèi)力？其連接有 哪幾種類型？ 答：高強螺栓主要是靠被連接構(gòu)件接觸面之間的摩擦力來傳遞內(nèi)力。 。 4. 混凝土的抗壓性能好，可以不在軸心受壓構(gòu)件中配置一定數(shù)量的鋼筋，你認為這樣行嗎？ 答：不行。 ，并解釋用低強
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