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電大水工鋼筋混凝土結(jié)構(gòu)(本)形成性考核冊(cè)答案參考資料小抄(參考版)

2025-06-07 04:59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 en ough for foreign visitors to visit those iconic tourist spots, he noted. The city is home to the remains of the Jin sha civilizati on 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 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。這樣,在外荷載作用下,裂縫就能延緩或不會(huì)產(chǎn)生,即使出現(xiàn)了裂縫,裂縫寬度也不致過(guò)大。 P {7 O c39。 蝸 2.試述規(guī)范對(duì)預(yù)應(yīng)力混凝土構(gòu)件的裂縫控制的規(guī)定? 答:《規(guī)范》規(guī)定 :預(yù)應(yīng)力混凝土構(gòu)件裂縫控制等級(jí)分三級(jí): 2 ] P$ _ U9 Q9 I7 F$ | 一級(jí):嚴(yán)格要求不出現(xiàn)裂縫的構(gòu)件;二級(jí):一般要求不出現(xiàn)裂縫的構(gòu)件; 三級(jí):允許出現(xiàn)裂縫的構(gòu)件。( ) ! G) famp。 }* l D w 9.其它條件相同時(shí),隨著鋼筋保護(hù)層厚度增大,裂縫寬度將增大。 ( ) : V。 Q1 ramp。( ) 7.沿梁跨度方向,截面抗彎剛度是變化的,所以,驗(yàn)算變形時(shí)所采用的截面抗彎剛度是指平均的截面抗彎剛度。( √ ) 5.提高混凝土強(qiáng)度等級(jí)是減小鋼筋混凝土構(gòu)件裂縫寬度的有效措施。( √ ) 。 ( √ ) 2.預(yù)應(yīng)力軸心受拉構(gòu)件的承載力是由鋼筋決定的,與施加預(yù)應(yīng) 力的方法無(wú)關(guān)。 z K (A)保護(hù)層愈厚,平均裂縫間距愈大,裂縫寬度也愈寬; : l/ E7 i: `6 e9 ^ (B)保護(hù)層愈厚,平均裂縫間距愈小,裂縫寬度也愈寬; ( C)保護(hù)層厚度對(duì)平均裂縫間距沒(méi)有影響,但保護(hù)層愈厚,裂縫寬度也愈寬; 10.控制混凝土構(gòu)件因碳化引起 的沿鋼筋走向的裂縫的最有效的措施是 ( C ) (A)提高混凝土強(qiáng)度等級(jí) (B)增加鋼筋的截面面積 ( C)選用足夠的鋼筋保護(hù)層 。 X, F! n+ k! F% ]% g% I 8.構(gòu)件的凈截面面積 An、換算截面面積 A0、和混凝土截面面積 Ac存在如下關(guān)系 ( A ) (A)A0 An Ac (B)An A0 A0 ( C) A0 Ac Ac9 H。( A)截面尺寸大的構(gòu)件,鋼筋應(yīng)力σ s小 ( B)截面尺寸小的構(gòu)件,鋼筋應(yīng)力σ s大 ( C)兩個(gè)構(gòu)件的σ s均相同 * i4 ~. l0 ?( ~6 D O 5.后張法預(yù)應(yīng)力混凝土軸心受拉構(gòu)件制作完畢后,承受總壓力 600KN,若加載至混凝土應(yīng)力為零時(shí),則軸向力 N0滿足 ( B ) ( A) N0=600KN ( B) N0 600KN ( C) N0 600KN 蝸 6.對(duì)于給定配 筋率ρ te和混凝土保護(hù)層厚度 c不變的軸心受拉構(gòu)件,其裂縫間距 lcr將 ( C ) ( A)隨混凝土強(qiáng)度等級(jí)的提高, lcr會(huì)減小 ( B)隨混凝土強(qiáng)度等級(jí)的提高, lcr會(huì)增大; ( C)隨鋼筋直徑的減小, lcr會(huì)減小。 4.有兩個(gè)混凝土強(qiáng)度等級(jí)、鋼筋品種、鋼筋面積均相同,截面尺寸大小不同的軸心受拉構(gòu)件,當(dāng)它們開(kāi)裂時(shí) ( C )amp。 ! T9 A8 x2 [% I6 y, u 二、選擇題(每題 2分,共 20分) b8 \0 m2 U* H0 f r x1 d 1.有兩個(gè)截面尺寸、混凝土強(qiáng)度等級(jí)、鋼筋級(jí)別均相同,配筋率ρ不同的軸心受拉構(gòu)件,在它們即將開(kāi)裂時(shí) ( C ) ( A)ρ大的構(gòu)件,鋼筋應(yīng)力σ s小 ( B)ρ小的構(gòu)件,鋼筋應(yīng)力σ s大 ( C)兩個(gè)構(gòu)件的鋼筋應(yīng)力σ s均相同 peII (B)?l相同時(shí),預(yù)應(yīng)力筋中應(yīng)力 ?con及 ? 2.條件相同的先、后張法軸拉構(gòu)件,當(dāng) ( A)兩者相等 ( B)后張法大于先張法 ( C)后張法小于先張法 : q! I. F39??梢?jiàn)二者的抗裂能力是 _預(yù)應(yīng)力 _的大。 6.通常對(duì)結(jié)構(gòu)施加預(yù)應(yīng)力的方法有兩種,分別是 _先張法 __和 __后張法 ___。 J6 N. amp。 4.提高鋼筋混凝土構(gòu)件抗裂度的有效措施是 加大構(gòu)件截面尺寸 和 _提高混凝土的強(qiáng)度等級(jí) __。 2.在其它條件相同時(shí),配筋率越高,平均裂縫間距越 _小 __,平均裂縫寬度越 _小 _,其它條件相同時(shí),混凝土保護(hù)層越厚,平均裂縫寬度越 __大 _____。 U。 。 4.矩形截
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