電大20xx年混凝土結(jié)構(gòu)設(shè)計(jì)原理形成性考核冊(cè)答案資料(參考版)
2025-06-07 02:37本頁(yè)面
【正文】 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. 。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, he said on Wednesday in Xi39。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 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 Qi ng cheng Mountains and the Du jiang yan irrigation system. Qing cheng has long been recognized as the birthplace of Taoism, China39。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。 17 ① 若上述設(shè)計(jì)條件不能改變，試進(jìn)行配筋計(jì)算。（ ） 三、 簡(jiǎn)答題 1．與普通混凝土相比，預(yù)應(yīng)力混凝土具有哪些優(yōu)勢(shì)和劣勢(shì)？ 2．簡(jiǎn)述有粘結(jié)預(yù)應(yīng)力與無(wú)粘結(jié)預(yù)應(yīng)力的區(qū)別 ？ 16 3．列舉三種建筑工程中常用的預(yù)應(yīng)力錨具？ 4．預(yù)應(yīng)力混凝土結(jié)構(gòu) 及 構(gòu)件所用的混凝土，需滿足哪些要求？ 5． 引起預(yù)應(yīng)力損失的因素有哪些？如何減少各項(xiàng)預(yù)應(yīng)力損失？ 6．公路橋涵按承載力極限狀態(tài)和正常使用極限狀態(tài)進(jìn)行結(jié)構(gòu)設(shè)計(jì)，在設(shè)計(jì)中應(yīng)考慮哪三種設(shè)計(jì)狀況？分別需做哪種設(shè)計(jì)？ 四、 計(jì)算題 1．已知一矩形截面簡(jiǎn)支梁，截面尺寸 b h=200mm550mm ，混凝土強(qiáng)度等級(jí)為 C25，縱向鋼筋采用 HRB335級(jí)，安全等級(jí)為二級(jí)，梁跨中截面承受的 最大彎矩設(shè)計(jì)值為 M=160kN（ ） 11．我國(guó)《公路橋規(guī)》關(guān)于裂縫寬度的計(jì)算與 《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》 是相同的。（ ） 9． 與《房建規(guī)范》不同，《公路橋規(guī)》在抗剪承載力計(jì)算中，其混凝土和箍筋的抗剪能力 csV 沒(méi)有采用兩項(xiàng)相加的方法，而是采用破壞斜截面內(nèi)箍筋與混凝土的共同承載力。 ( ) 7．為保證鋼筋與混凝土的粘結(jié)強(qiáng)度，防止放松預(yù)應(yīng)力鋼筋時(shí)出現(xiàn)縱向劈裂裂縫，必須有一定的混凝土保護(hù)層厚度。對(duì)采用鋼絞線、鋼絲、熱處理鋼筋作預(yù)應(yīng)力鋼筋的構(gòu)件，特別是大跨度結(jié)構(gòu)，混凝土強(qiáng)度等級(jí)不宜低于 C40。（ ） 4．對(duì)先張法預(yù)應(yīng)力構(gòu)件，預(yù)應(yīng)力是依靠鋼筋端部的錨具來(lái)傳遞的。（ ） 2．無(wú)粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)通常與先張預(yù)應(yīng)力工藝相結(jié)合。 A．錨固回縮損失 B．摩擦損失 C．溫差損失 D．應(yīng)力松弛損失 5．公路橋涵現(xiàn)澆梁、板的混
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