電大混凝土結(jié)構(gòu)設(shè)計(jì)a期末復(fù)習(xí)參考資料小抄-閱讀頁(yè)
2025-06-22 21:55本頁(yè)面
【正文】 的靜定結(jié)構(gòu)來(lái)說(shuō)是基本符合的，但對(duì)具有一這定塑性的超靜定連續(xù)梁、板來(lái)說(shuō)，就不完全正確，因?yàn)楫?dāng)這種構(gòu)件某截面的受拉鋼筋達(dá)到屈服進(jìn)入第Ⅲ階段時(shí)，只要整個(gè)結(jié)構(gòu)是幾何不變的，它就仍有一定的承載力，仍然可以繼續(xù)加載。利用該現(xiàn)象 能夠充分發(fā)揮材料的強(qiáng)度儲(chǔ)備，因此，在結(jié)構(gòu)計(jì)算中應(yīng)予以考慮。 由于將鋼筋混凝土預(yù)制柱插入基礎(chǔ)杯口一定的深度、并用高強(qiáng)度等級(jí)的細(xì)石混凝土和基礎(chǔ)緊密地澆成一體，因此可作為固端考慮。 由于屋架（或者屋面梁）與柱頂連接用螺栓連接或用預(yù)埋件焊接，這種連接對(duì)抵御轉(zhuǎn)動(dòng)的能力很弱，因此可作為鉸接考慮。 排架橫梁為鋼筋混凝土屋架或屋面梁時(shí)，由于這種構(gòu)件的下弦剛度較大，在受力后長(zhǎng)度變化很小，可以略去不計(jì)，因此可認(rèn)為橫梁是剛性連桿。 ，框架結(jié)構(gòu)一般分為哪三種類型？并論述它們各自的優(yōu)缺點(diǎn)。 現(xiàn)澆式框架即梁、柱、樓蓋 均為現(xiàn)澆鋼筋混凝土結(jié)構(gòu)。但現(xiàn)場(chǎng)澆筑混凝土的工作最較大。其優(yōu)點(diǎn)是構(gòu)件均為預(yù)制， 可實(shí)現(xiàn)標(biāo)準(zhǔn)化、工廠化、機(jī)械生產(chǎn)。但整體性較差，抗震能力弱，不宜在地震區(qū)應(yīng)用。現(xiàn)澆預(yù)制框架既具有較好的整體性和抗震能力，又可采用預(yù)制構(gòu)件， 減少現(xiàn)場(chǎng)澆筑混凝土的工作量。但節(jié)點(diǎn)區(qū)現(xiàn)場(chǎng)澆筑混凝土施工復(fù)雜。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。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 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 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 w orld at large, he said on Wednesday in Xi39。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.
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