【正文】 an. Lou held a joint interview with 27 media, including China Daily, the first in a series of interviews entitled Chinese Media A long the Silk Road. The interviews will be in Sha。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 A sian countries, being an encouraging blueprint for Chinese areas along the Silk Road that has linked Asia and Europe for more than 2,000 y ears. In the next three w eeks, 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 ancient indigenous religion, while Du jiang yan is considered to be the oldest functioning watercontrol project in the world. Chengdu ranked third 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 touris m products, improve English services and provide accurate translation of traffic signs and scenic billboards. Zhao Yun, 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 settling 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。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。 第 33 頁 共 33 頁 Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。 四、計算題 : 23 3 233 3 301. 24 0 16 2 32 0 10 10 88 010 32 0 / 12 2 24 0 16 / 12 24 0 16 16 8 224 4 , 06 6 , 00 02 16 24 0 / 12 32 0 10 / 12 36 86 4 , 00 024 4 , 06 6 , 00 014 71088036 86 4 , 00 058 .2108801080014xyxxyyxxxA m mImmI m mIi m mAIi m mAli?? ? ? ? ? ?? ? ? ? ? ? ? ? ??? ? ? ? ? ?? ? ?? ? ???解 ：032272 .1 7360061 .858 .2 44 , 0115 00 1017 / 21 5 / 01 10 80 0yyyxyliN m m f N m m????? ? ????? ? ??查 表 得 此柱的整體穩(wěn)定性滿足要求。 ：框架梁的構造措施應考慮：梁截面尺寸、梁的配筋率、梁的箍筋、梁內縱筋錨固。腹桿為軸心受拉桿件或軸心受壓桿件。 ：屋架桿件的受力特點：上弦桿一般為受壓桿件，當有節(jié)間荷載時為壓彎構件。但在摩擦力被克服后變形較大，故僅適用于承受靜力荷載或間接承受動力荷載的結構、構件的連接。 承壓型連接：起初由摩擦傳力，后期同普通螺栓連接一樣，依靠桿和螺孔之間的抗剪和承壓來傳力。 摩擦型連接：外力僅依靠部件接觸面間的摩擦力來傳遞。 對直接承受動力荷載的普通螺栓受拉連接應采用雙螺帽或其他能防止螺帽松動的有效措施。 ：鋼結構設計規(guī)范（ GB500172021）對承重結構的鋼材宜采用 Q235 鋼（ 3 號鋼）、 Q345 鋼 (16Mn 鋼 )、 Q390 鋼（ 15MnV 鋼）和新品種 Q420 鋼（ 15MnVN）四種。（ 2）脆性破壞：在塑性變形很小或基本沒有塑性變形的情況下突然發(fā)生的，破壞時構件的計算應力可能小于鋼材的屈服點，斷裂從應力集中處開始，破壞的斷口平齊并呈有光澤的晶粒狀。（ 6）構件的重要性及房屋的使用情況：非承重墻，允許高厚比可提高；使用有振動的房屋，允許高厚比應降低。（ 4）支承條件：剛性方案房屋墻、柱的允許高厚比可提高；而彈性和剛彈性方案，允許高厚比應減小。（ 2）砌體類型：毛石墻砌體較實心墻剛度差，允許 高厚比應降低； 29 組合磚砌體剛度好，允許高厚比應相應提高。當橫墻不能同時滿足上述要求時，應對橫墻的剛度進行驗算，如其最大水平位移值max 4000Hu ?時，仍可視作剛性或者剛彈性方案橫墻。（ 3）縱、橫兩個方向 的空間剛度均比較好。 縱、橫墻承重體系的特點：（ 1）橫墻的間距可以加大，房間的使用空間較橫墻承重體系增加。 2．答：（ 1）將多層框架分層，以每層梁與上下柱組成的單層框架為計算單元，柱遠端假定為固定；（ 2）用力矩分配法分別計算各單元的內力，傳遞系數對底層柱為 1/2，其余層柱為 1/3；（ 3）分層計算所得的梁端彎矩即為最后彎矩。 (2)半現澆式框架：梁、柱為現澆，樓板為預制，或柱為現澆，梁板為預制的結構。 27 030160 3012. 400 40 360400 10 360 , 3002 80 ,220 10550 , m a x , 20 20400 10 30570 300 400bcsaiach mmNx mm h mmfbx mmMhe mm e mm mmNe e e mmfAN????? ? ??? ? ? ? ? ? ?????? ??? ? ? ? ???? ??? ? ?? ? ???解 ：假 設 為 大 偏 壓 構 件且 為 大 偏 心 受 壓 構 件 。（ 2）活載包括：屋面荷載，吊車荷載，均布風載以及作用在屋蓋支承處的集中風荷載等。 (5)基礎梁：承擔圍護墻體的重量。 (3)連系梁：連系縱向柱列，以增加廠房的縱向剛度，并傳遞風荷載至縱向柱列。 26 ：（ 1）抗風柱：將山墻風荷載傳遞至基礎。 屋蓋支撐包括：（ 1） 橫向水平支撐 。（ 2）后張法： 依靠其兩端的錨具錨住預應力鋼筋并傳遞預應力，適用于大型構件。（ 2）后張法： 澆注混凝土構件，預留孔洞→養(yǎng)護混凝土到規(guī)定強度→在孔道中穿筋，并在構件上用張拉機具張拉預應力鋼筋到控制應力→張拉端用錨具錨住預應力鋼筋，并在孔洞內壓力灌漿。（ 3）判別： b??? ，為大偏心受壓破壞， b??? ，小偏心受壓破壞。 022, m a x 1 060, m a x60 50 0 60 44 0( 1 ) 11 .9 20 0 44 0 18 ( 1 18 )17 10 17 26 0,u c b bsbusyh h mm mmM f bhN mm k N m M k N mA x hMMAf? ? ??? ? ? ? ?? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ?? ??? ??2. 解 ： (1) 驗 算 是 否 需 要 采 用 雙 筋 截 面計 算 此 梁 若 設 計 成 單 筋 截 面 所 能 承 受 的 最 大 彎 矩 ：故 應 設 計 成 雙 筋 截 面(2) 求 受 壓 鋼 筋 令62010 2( 26 0 17 ) 1057 ( ) 36 0 ( 44 0 35 )( 3 )11 .9 20 0 18 44 0 36 0 57 20 76 .8360ss