【正文】 EC is going on in Beijing, the exhibit aims to show the world this brilliant section of history. The Silk Road is a series of trade and cultural transmission routes that were central to cultural interaction through regions of the Asian continent. It connected the West and East by linking traders, merchants, pilgrims, monks, soldiers, nomads, and urban dwellers from China and India to the Mediterranean Sea during various periods of time. I met my dear hubby in 2022 the second year I was in my school and it was the first year when he came here. We became colleagues. And there was nothing special happening during that year. He was just a kind and humble brother graduated from the same college as me. But we did not know each other till he became my colleague and his office desk was just in front of me. There was only a glass between us. So actually we could see each other when we both look up. But it is not the main reason that really draws us close. How we bee close to each other was something seems quite natural. We went out to play badminton with other colleagues and we sometimes chatted for a while. He is a man of few words but somehow sometimes will say something really humorous. Then one day, to my great surprise, I found a pot of beautiful flower on my desk. It was just the flower I had talked about with my colleague the other day, and I thought it was her who put the flower there. But the truth is not. It was the humble guy sitting in front of me. He just simply said ,”well, I caught sight of this flower and thought that it’s beautiful and you may like it”. I wonder why I was moved because of these simple words and present. Maybe it is the sincerity and the true self that impress me. I thanked him and some colleagues walked past my desk would appreciate the beautiful flower and they noticed that something romance happened there. Then later on, there were some little surprises once in a while. Once, there was something wrong with my drawer and I had plained about it unconsciously. And he fixed it for me. Then the other day, he placed several pink diamond roses beside the flower with a piece of paper saying” I love you more than I can say! Diamond stands for marriage, rose stand for love. I hope you are mine, bee my wife. You are the only girl who I really want to spend the rest of my life to stand by.” Although t。s Day on February 14, characterized by bouquets of roses, chocolates and romantic candlelight dinners, than they do about their homegrown day for lovers. Even Qixi is nowadays referred to as the Chinese Valentine39。s largest virgin forest, and known for its spring and ecological environment, Arxan is marveled at by many tourists as the purest land on earth. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. Shutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. The silver birch turns golden, while the larch is still proudly green. You will find yourself drowned in the intoxicating red of the wild fruits as well as the glamour of flowers in full blown. And your heart will be lingering on the woods as it39。 預(yù)應(yīng)力鋼束與管道壁之間的摩擦引起的預(yù)應(yīng)力損失 按《公預(yù)規(guī)》 ，計(jì)算公式為 ()1 [1 ]kxl con e ???? ???? （ ） 式中： con? —— 張拉鋼束時錨下的控制應(yīng)力；根據(jù)《公預(yù)規(guī)》 ，對于 鋼絞線取張拉控制應(yīng)力為： 5 5 18 60 13 95 ( )c on pkf M Pa? ? ? ? ? ? —— 鋼束與管道壁的摩擦系數(shù)，對于預(yù)埋波紋管取 ?? ； ? —— 從張拉端到計(jì)算截面曲線管道部分切線的夾角之和（ rad）； k —— 管道每米局部偏差對摩擦的影響系數(shù)，取 ? ； x —— 從張拉端到計(jì)算截面的管道長度（ m），可近似取其在縱軸上的投影長度，當(dāng)四分點(diǎn)為計(jì)算截面時， /4xix a l?? 四分點(diǎn)截面管道摩擦損失計(jì)算表 表 81 鋼束 ? ? ??? ?? x kx kx??? ()1 kxe ????? ()[1 ]kxcon e ??? ??? 號 ()? ()rad ()cm ()m N1（ N2） 7 2 4 5 6 N3（ N4） 7 2 4 1 N5 N6 N7 跨中截面管道摩 擦損失計(jì)算表 表 82 鋼束號 ? ? ??? ?? x ()cm kx ()m kx??? ()1 kxe ????? ()[1 ]kxcon e ??? ??? ()? ()rad N1（ N2） 7 N3（ N4） 7 N5 15 N6 15 N7 15 由錨具變形、鋼束回縮引起的預(yù)應(yīng)力損失 按《公預(yù)規(guī)》 ，對曲線預(yù)應(yīng)力筋，在計(jì)算錨具變形、鋼束回縮引起的預(yù)應(yīng)力損失時，應(yīng)考慮錨固后反向摩擦的影響。 21 001800150500150140ajobajob③① ①② ②④ ④⑥⑤ 圖 71 靜距計(jì)算式（尺寸單位： mm） 跨中截面面積和慣性矩計(jì)算表 表 71 特性 分類 截面 分塊名稱 分塊面積 iA 2()cm 分塊面積重心至上緣距離iy ()cm 分塊面積對上緣靜距 iS ()cm 全截面重心到上緣距離 sy ()cm 分塊面積的自身慣矩 tI 4()cm i s id y y?? ()cm 2y i iI Ad? 4()cm I? iI? yEI? 4()cm 1b? 208cm 凈 截 面 毛截面 8185 63． 3 32652107 127706 29332561 扣管道面積 ? 467457 32652107 1b? 210cm 換 算 截 面 毛截面 8185 32652107 34945456 混凝土接縫 28 7 196 鋼束換算面積 51004 ? 32652107 計(jì)算數(shù)據(jù) 227 .5 4 4 .1 8 ( )4A cm?? ? ? ? 7n? 根 EP ? ? 跨中截面對重心軸靜距計(jì)算表 表 72 分塊名稱及序號 凈 截 面 換 算 截 面 靜距類別及符號3()cm 分塊面積iA 2()cm 分塊至全截面重心距離 iy 對凈軸靜距i j i iS Ay? ?（ cm3） 靜距類別及3()cm符號 分塊面積iA 2()cm iy ()cm i j i iS Ay? ? （ cm3） 翼板① 翼緣部分對凈2632 139521 翼緣部分對凈軸靜2260 三角承托② 950 42 688 肋部 ③ 軸靜距ajS? 480 22728 距 0aS? 480 ∑ 202279 232532 下三角④