本文關(guān)鍵詞： 雙鏈?zhǔn)綉宜鳂?結(jié)構(gòu)參數(shù)分析 靜力特性 動(dòng)力特性　出處：《蘭州交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：由于雙鏈?zhǔn)綉宜鳂蛟趧?dòng)力性能方面優(yōu)于單鏈?zhǔn)綉宜鳂�，結(jié)合雙鏈?zhǔn)綉宜鳂虻陌l(fā)展與建造明顯滯后于單鏈?zhǔn)�，本文有針�?duì)性的研究了雙鏈?zhǔn)綉宜鳂蚪Y(jié)構(gòu)參數(shù)對(duì)其靜力特性和動(dòng)力特性方面的影響。 本文結(jié)合關(guān)頭壩雙鏈?zhǔn)綉宜鳂蚬こ虒?shí)例，利用有限元分析軟件Midas/Civil建造了該工程實(shí)例的模型。通過(guò)調(diào)整各個(gè)參數(shù)，得到每個(gè)參數(shù)控制下該橋的靜力和動(dòng)力特性的數(shù)據(jù)。歸納及分析數(shù)據(jù)，得出以下結(jié)論。 靜力特性方面：（1）從主塔內(nèi)力影響的角度出發(fā)，塔梁一般支撐的連接方式是最有利的一種連接方式；（2）雙鏈?zhǔn)綉宜鳂蛟谒汗探Y(jié)的情況下，其加勁梁跨中撓度值最�。唬�3）索塔固結(jié)的情況下，塔底產(chǎn)生的彎矩比索塔滑移的情況下產(chǎn)生的彎矩大的多；（4）增大懸索橋跨度比可以有效的減小纜索邊跨應(yīng)力，同時(shí)合理的增大跨度比，可以降低錨固端支座反力；（5）增大雙鏈?zhǔn)綉宜鳂虻氖缚绫�，能夠明顯的降低橋塔的內(nèi)力，減小纜索應(yīng)力，改善橋塔受力，但其豎向的整體剛度越小，加勁梁的跨中撓度值將增加。 動(dòng)力特性方面：（1）隨著矢跨比的依次減小，雙鏈?zhǔn)綉宜鳂虻臋M彎、豎彎以及扭轉(zhuǎn)的自振頻率都會(huì)增加，一旦超過(guò)某一矢跨比值，其上升速度將減�。唬�2）在保持其他參數(shù)不變的情況下，依次修改雙鏈?zhǔn)綉宜鳂虻乃杭s束可以發(fā)現(xiàn)，，不同的約束方式對(duì)其自振頻率有很大的影響，一般塔梁約束的自由度多少與其剛度和頻率的增長(zhǎng)成反比；（3）在不同的索塔約束方式條件下，保持其他參數(shù)不變，雙鏈?zhǔn)綉宜鳂虻淖哉耦l率基本沒(méi)有變化；（4）跨度比對(duì)雙鏈?zhǔn)綉宜鳂虻淖哉耦l率基本無(wú)影響，對(duì)其剛度的變化也無(wú)影響；（5）隨著加勁梁的縱梁的豎向剛度的增大，雙鏈?zhǔn)綉宜鳂虻呢Q彎、橫彎及扭轉(zhuǎn)自振頻率會(huì)顯著的增大。 結(jié)合研究分析，可見(jiàn)實(shí)際工程中所采用塔梁約束形式，索塔約束形式和矢跨比都是比較合理的。
[Abstract]:Because the double chain suspension bridge is superior to the single chain suspension bridge in dynamic performance, the development and construction of the double chain suspension bridge lag behind the single chain suspension bridge obviously. In this paper, the influence of structural parameters on static and dynamic characteristics of double chain suspension bridge is studied. In this paper, the model of the double chain suspension bridge of critical dam is built by using the finite element analysis software Midas/Civil, and the parameters are adjusted. The static and dynamic characteristics of the bridge under the control of each parameter are obtained, the data are summarized and analyzed, and the following conclusions are obtained. From the point of view of the influence of the internal force on the main tower, the connection mode of the general support of the tower and beam is the most favorable connection mode. 2) under the condition of tower beam consolidation, the deflection of the stiffened beam in the middle span of the double chain suspension bridge is the smallest; 3) in the case of cable tower consolidation, the bending moment produced by the bottom of the tower is much larger than that by the sliding cable tower. (4) increasing the span ratio of suspension bridge can effectively reduce the span stress of cable side and reasonably increase the span ratio, which can reduce the reaction force of anchor end support; 5) increasing the rise-span ratio of the double-chain suspension bridge can obviously reduce the internal force of the bridge tower, reduce the cable stress and improve the stress of the bridge tower, but the smaller the overall vertical stiffness, the higher the mid-span deflection of the stiffened beam. In the aspect of dynamic characteristics: 1) with the decrease of rise-span ratio, the natural frequencies of transverse bending, vertical bending and torsion of double-chain suspension bridge will increase, and the rising speed will decrease when the ratio exceeds a certain rise-span ratio. 2) under the condition of keeping other parameters unchanged, it can be found that different constraint modes have great influence on the natural vibration frequency of double-chain suspension bridge by modifying the tower and beam constraints in turn. The degree of freedom of a general tower beam is inversely proportional to the increase of its stiffness and frequency. (3) the natural vibration frequency of the double-chain suspension bridge is basically unchanged under the conditions of different cable tower constraints and other parameters remain unchanged; (4) the ratio of span to span has no effect on the natural vibration frequency of the double-chain suspension bridge, nor does it affect the change of the stiffness of the bridge. 5) with the increase of vertical stiffness of stiffened beam, the natural frequencies of vertical bending, transverse bending and torsional vibration of double chain suspension bridge will increase significantly. According to the research and analysis, it can be seen that the tower beam constraint form, the cable tower constraint form and the rise-span ratio are reasonable in practical engineering.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.25

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 胡俊;歐進(jìn)萍;;風(fēng)雨共同作用下大跨懸索橋加勁梁抖振響應(yīng)分析[J];中國(guó)鐵道科學(xué);2013年06期

本文編號(hào)：1477165