本文選題：纜索承重體系 + 組合體系��； 參考：《長安大學》2015年碩士論文

【摘要】：近年來由于交通事業(yè)蓬勃發(fā)展,對橋梁結(jié)構體系創(chuàng)新的要求愈來愈高,橋梁工作者也愈發(fā)重視橋梁結(jié)構的新穎和力學美。結(jié)構體系創(chuàng)新取得的最矚目的成就之一就是纜索承重體系的演變,斜拉橋和懸索橋外形美觀,富有震撼力,能起到標志性建筑的作用。斜拉橋剛強有力,懸索橋嫵媚纖巧,把兩者結(jié)合起來的組合體系則體現(xiàn)了剛與柔的結(jié)合美。組合體系與自錨式懸索橋相比,抗風穩(wěn)定性較好,與斜拉橋相比,主塔高度有所減小,同時省掉巨大的錨碇,因此組合體系適用于較差的地質(zhì)條件,且可以提高經(jīng)濟性能,有很大的競爭力。本文以漢中市龍崗大橋為背景工程,對自錨式懸索—斜拉組合體系橋進行了如下研究:(1)本文對自錨式懸索—斜拉組合體系的合理成橋狀態(tài)進行研究,在目前的懸索橋和斜拉橋合理成橋狀態(tài)方法的基礎上,引入了分步成橋狀態(tài)計算方法,即把模型分解成自錨式懸索段和斜拉段:利用節(jié)線法得到主纜的初始線形,既而利用索單元模擬主纜,考慮非線性開始迭代分析,得到自錨式懸索段合理成橋狀態(tài);利用彎曲能量最小法初步得到斜拉索力,運用影響矩陣法初步進行斜拉索力的優(yōu)化,運用索單元模擬拉索,進行非線性迭代確定斜拉段的合理成橋狀態(tài);最后用合龍段把兩部分連接成整體后,原來兩部分各自的平衡狀態(tài)被打破,結(jié)構發(fā)生新的變形,懸索部分背索和斜拉部分拉索的索力發(fā)生變化,應用不變形預張力的索力不變原理修正背索和拉索索力即首先計算出合龍后所有背索和斜拉索的索長,然后把合龍前后背索和斜拉索的索長變化量計入無應力索長,再運行分析得到組合體系的合理成橋狀態(tài)。(2)自錨式懸索—斜拉組合體系結(jié)構復雜,影響參數(shù)眾多,本文在前人的研究基礎之上增加了副塔傾角和懸索主纜矢跨比兩個參數(shù),研究它們對自錨式懸索—斜拉組合體系合理成橋狀態(tài)的影響程度。隨著副塔傾角的增大,懸索段主纜索力減小,背索索力增大,斜吊桿索力增大;對于邊跨懸索段,主梁軸向壓力和彎矩均減小。隨主纜矢跨比增加,懸索段主纜索力、背索索力和斜吊桿索力均減小;主梁軸向壓力、彎矩和剪力均減小。
[Abstract]:In recent years, due to the vigorous development of transportation, the requirement of bridge structure system innovation is becoming higher and higher. Bridge workers pay more and more attention to the novelty and mechanical beauty of bridge structure. One of the most remarkable achievements of structural system innovation is the evolution of cable bearing system, cable-stayed bridge and suspension bridge have beautiful appearance, full of shock force, can play the role of iconic building. The cable-stayed bridge is strong and the suspension bridge is charming and slender. The combination system of the two reflects the beauty of the combination of rigidity and flexibility. Compared with the self-anchored suspension bridge, the combined system has better stability against wind, and the height of the main tower is smaller than that of the cable-stayed bridge, while the huge Anchorage is saved, so the combined system is suitable for the poor geological conditions and can improve the economic performance. Be very competitive. Based on the Longgang Bridge in Hanzhong City, this paper studies the self-anchored suspension cable-stayed composite system bridge as follows: 1) this paper studies the reasonable bridge state of self-anchored suspension cable-stayed composite system. On the basis of the current reasonable state of suspension bridge and cable-stayed bridge, this paper introduces a step by step method to calculate the state of the bridge, that is, the model is decomposed into self-anchored suspension cable section and cable-stayed section, and the initial line shape of the main cable is obtained by using the nodal line method. Therefore, the cable element is used to simulate the main cable, considering the nonlinear initial iterative analysis, the reasonable bridge state of the self-anchored cable section is obtained, and the cable force is preliminarily obtained by using the minimum bending energy method, and the influence matrix method is used to optimize the cable-stayed cable force. The cable element is used to simulate the cable, and the nonlinear iteration is carried out to determine the reasonable bridge state of the cable-stayed section. Finally, when the two parts are connected into a whole with the closing section, the original equilibrium state of the two parts is broken, and the new deformation of the structure occurs. The cable force of the suspension cable part and the stay part cable changes, the cable force invariant principle of undeformed pretension is applied to modify the back cable and cable force, that is to say, the cable length of all the back cables and stay cables after the closure is first calculated. Then, the variation of cable length of back cable and stay cable before and after closure is taken into account as non-stress cable length, and then the reasonable bridge state of composite system is obtained by operation analysis. The structure of self-anchored cable-stay composite system is complex, and the influence parameters are numerous. In this paper, two parameters, the auxiliary tower inclination angle and the rise-span ratio of the main cable of suspension cable, are added on the basis of previous studies, and the influence of these parameters on the reasonable bridge state of self-anchored cable-stayed composite system is studied. With the increase of the inclined angle of the auxiliary tower, the main cable force of the suspension cable section decreases, the back cable force increases, the oblique suspension cable force increases, and the axial pressure and bending moment of the main beam decrease for the side span suspension cable section. With the increase of the rise-span ratio of the main cable, the main cable force, the back cable force and the slant cable force of the suspension section decrease, while the axial pressure, bending moment and shear force of the main beam decrease.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.5

【參考文獻】

相關期刊論文 前1條

1 王伯惠;斜拉—懸索協(xié)作體系橋[J];遼寧省交通高等�？茖W校學報;2000年03期

，

本文編號：1975672