本文關(guān)鍵詞：超大跨度部分地錨式斜拉橋抗風(fēng)性能研究　出處：《浙江工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 超大跨度部分地錨式斜拉橋 動力特性 空氣靜力穩(wěn)定性 空氣動力穩(wěn)定性 設(shè)計參數(shù) 施工階段

【摘要】：為適應(yīng)21世紀(jì)我國公路交通建設(shè)的需要,斜拉橋的跨徑日趨增長,尤其是蘇通長江大橋的建成,標(biāo)志著超千米斜拉橋的新時代的到來�？鐝皆介L,斜拉橋的結(jié)構(gòu)剛度越低,致使斜拉橋抗風(fēng)穩(wěn)定性成為影響其設(shè)計和建設(shè)的關(guān)鍵問題。為探索超千米斜拉橋適宜的結(jié)構(gòu)體系,論文以當(dāng)前備受關(guān)注的部分地錨式斜拉橋設(shè)計概念為著手,對主跨1400m的部分地錨式斜拉橋設(shè)計方案進(jìn)行結(jié)構(gòu)動力特性、空氣靜力和動力穩(wěn)定性等方面的詳細(xì)分析和探究,從抗風(fēng)性能角度探討了部分地錨式斜拉橋設(shè)計概念用于超千米跨度橋梁的適用性及其適宜的結(jié)構(gòu)體系,研究成果對超千米斜拉橋的抗風(fēng)設(shè)計具有良好的指導(dǎo)意義。首先,采用Midas/Civil和大跨度橋梁三維非線性抗風(fēng)穩(wěn)定性分析程序,對主跨1400米的部分地錨式斜拉橋進(jìn)行結(jié)構(gòu)動力特性、空氣靜力和動力穩(wěn)定性進(jìn)行分析,在此基礎(chǔ)上與同等跨徑的自錨式斜拉橋和懸索橋(江陰大橋)進(jìn)行對比分析,指出部分地錨式斜拉橋在結(jié)構(gòu)動力特性、空氣靜力和動力穩(wěn)定性方面更具有優(yōu)勢。其次,對部分地錨式斜拉橋的主要設(shè)計參數(shù)包括地錨段的長度、輔助墩個數(shù)、主梁高度、主梁寬度、橋塔高跨比等對部分地錨式斜拉橋結(jié)構(gòu)動力特性、空氣靜力和空氣動力穩(wěn)定性的影響進(jìn)行了分析研究,提出了關(guān)鍵設(shè)計參數(shù)及其合理取值。最后,開展了部分地錨式斜拉橋施工過程的抗風(fēng)穩(wěn)定性分析。研究結(jié)果表明:1)邊跨部分斜拉索采用地錨方式后,斜拉橋結(jié)構(gòu)的整體剛度增強,結(jié)構(gòu)的自振頻率增大,結(jié)構(gòu)的空氣靜力和動力穩(wěn)定性因而增強,從抗風(fēng)性能而言,部分地錨式斜拉橋更適宜采用于千米以上主跨的斜拉橋。2)部分地錨式超大跨度斜拉橋在地錨段長度增加、梁高增大、梁寬增加、邊跨增設(shè)輔助墩、高跨比加大等情況下,可以獲得比較好的空氣靜力和動力穩(wěn)定性。3)超大跨度斜拉橋隨著主梁拼裝長度的增大,結(jié)構(gòu)的豎彎頻率變化不大,但結(jié)構(gòu)的側(cè)彎和扭轉(zhuǎn)頻率則明顯下降,同時出現(xiàn)較強的側(cè)彎和扭轉(zhuǎn)耦合,結(jié)構(gòu)的抗風(fēng)穩(wěn)定性因而顯著降低。總體上看,施工過程結(jié)構(gòu)的抗風(fēng)失穩(wěn)臨界風(fēng)速都比較高,超千米跨度的斜拉橋施工期具有良好的抗風(fēng)穩(wěn)定性。
[Abstract]:In order to meet the needs of highway traffic construction in 21th century, the span of cable-stayed bridge is increasing day by day, especially the completion of Sutong Yangtze River Bridge, which marks the arrival of a new era of cable-stayed bridge with more than one kilometer. The longer the span is, the longer the span is. The lower the structural stiffness of cable-stayed bridge is, the more the stability of cable-stayed bridge against wind becomes the key problem to affect the design and construction of cable-stayed bridge. Based on the design concept of partial ground anchor cable-stayed bridge which has been paid much attention to at present, the structural dynamic characteristics of the design scheme of partial ground anchor cable-stayed bridge with main span of 1400m are carried out in this paper. Based on the detailed analysis and exploration of air static and dynamic stability, the applicability of the design concept of partial ground anchor cable-stayed bridge and its suitable structure system for super-kilometer span bridges are discussed from the point of view of wind resistance. The research results have a good guiding significance for the wind resistance design of the super kilometer cable-stayed bridge. Firstly, the Midas/Civil and the three-dimensional nonlinear wind stability analysis program of the long-span bridge are adopted. The structural dynamic characteristics, air static and dynamic stability of partial ground anchor cable-stayed bridge with 1400m main span are analyzed. On the basis of the comparison with the self-anchored cable-stayed bridge and suspension bridge (Jiangyin Bridge) with the same span, it is pointed out that some ground-anchored cable-stayed bridges have dynamic characteristics in the structure. Secondly, the main design parameters of partial ground anchor cable-stayed bridge include the length of ground anchor section, the number of auxiliary piers, the height of main beam and the width of main beam. The effects of tower height to span ratio on the dynamic characteristics, air static and aerodynamic stability of some ground anchor cable-stayed bridges are analyzed, and the key design parameters and their reasonable values are put forward. The wind stability analysis of partial ground anchor cable-stayed bridge during construction is carried out. The results show that the overall stiffness of cable-stayed bridge structure is enhanced after the partial stay cable of the side span of 1: 1) adopts the ground anchor mode. With the increase of the natural frequency of the structure, the air static and dynamic stability of the structure is enhanced. Partial ground anchor cable-stayed bridge is more suitable for cable-stayed bridge with main span of more than km. 2) partial ground anchor type super-span cable-stayed bridge increases in length of anchor section, beam height increases, beam width increases, side span adds auxiliary pier. Under the condition of increasing the ratio of height to span, a relatively good static and dynamic stability of air can be obtained. 3) the frequency of vertical bending of long-span cable-stayed bridge with large span increases with the increase of the assembly length of the main beam, and the frequency of vertical bending of the bridge does not change much. However, the frequency of lateral bending and torsion of the structure is obviously decreased, and there is a strong coupling of lateral bending and torsion at the same time, so the stability of the structure against wind is reduced significantly. The critical wind speed of the construction process structure is relatively high, and the cable-stayed bridge with a span of more than one kilometer has good wind-resistant stability during the construction period.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U448.27

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相關(guān)碩士學(xué)位論文 前1條

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本文編號：1425268