【摘要】：進(jìn)入21世紀(jì)以來(lái),我國(guó)的交通基礎(chǔ)設(shè)施得到了空前的快速發(fā)展,在許多城市涌現(xiàn)出多種具有創(chuàng)新美、和諧美與協(xié)調(diào)美的造型新穎,風(fēng)格獨(dú)特的景觀橋梁。懸索橋作為城市景觀橋的主要選型之一,結(jié)構(gòu)輕盈,橋形優(yōu)美,具有極高的美學(xué)價(jià)值。城市景觀懸索橋不同于傳統(tǒng)的懸索橋,為了景觀需要,其橋塔往往較傳統(tǒng)懸索橋塔高,主纜的坡度較陡,這給實(shí)際施工造成了很大困難�；诖�,闡述了懸索橋分類及其受力體系的特征,總結(jié)了城市景觀橋的結(jié)構(gòu)選型,并結(jié)合經(jīng)南八路潮河大橋地錨式懸索橋?qū)嵗こ?對(duì)地錨式懸索橋采用自錨式懸索橋體系轉(zhuǎn)換施工方法進(jìn)行監(jiān)控。在監(jiān)控實(shí)施之前,對(duì)主纜和索塔分別采用橋梁有限元軟件MIDAS/Civil和ANSYS進(jìn)行模擬分析;對(duì)塔柱及主梁線形和標(biāo)高、應(yīng)變進(jìn)行監(jiān)測(cè),指導(dǎo)調(diào)索方案制訂,并對(duì)整個(gè)施工過(guò)程橋梁結(jié)構(gòu)的應(yīng)力、索力、線形及溫度等數(shù)據(jù)進(jìn)行分析,得到如下主要結(jié)論:(1)索塔承臺(tái)和錨碇等大體積混凝土的入模溫度為26.3℃,凝結(jié)硬化過(guò)程中最高溫度Tmax達(dá)到了70.1℃,養(yǎng)護(hù)過(guò)程中溫度升高43.8℃,小于規(guī)范規(guī)定50℃,滿足要求。(2)在索塔建設(shè)階段,索塔各截面處于全截面受壓狀態(tài),隨著索塔混凝土節(jié)段澆筑施工的進(jìn)行,塔根測(cè)試截面的壓應(yīng)力大體呈線性增加,與設(shè)計(jì)值誤差在0.5MPa之內(nèi);體系轉(zhuǎn)換過(guò)程中,索塔最大壓應(yīng)力為-7.4MPa,最大拉應(yīng)力為1.862 MPa,與理論計(jì)算值吻合較好,滿足施工規(guī)范和設(shè)計(jì)要求。(3)吊索張拉過(guò)程中,吊索實(shí)際測(cè)定拉力值與計(jì)算值吻合較好,二者之間誤差較小;經(jīng)過(guò)一期與成橋索力調(diào)整,成橋吊索內(nèi)力與設(shè)計(jì)值最大偏差13.5%,全橋吊索內(nèi)力分布較為均勻。(4)根據(jù)鋼箱梁應(yīng)力監(jiān)控結(jié)果,主梁拉應(yīng)力最大29MPa,壓應(yīng)力最大30MPa,無(wú)應(yīng)力突變現(xiàn)象,施工過(guò)程安全。(5)潮河大橋的施工監(jiān)測(cè)和控制實(shí)踐表明,對(duì)索塔高度較高、主纜坡度較大的地錨式懸索橋,可以采用自錨式懸索橋體系轉(zhuǎn)換施工方法。梁纜同時(shí)施工,節(jié)省工期。
[Abstract]:Since the beginning of the 21st century, the transportation infrastructure of our country has been developing rapidly, and a variety of landscape bridges with innovative beauty, harmony beauty and coordination beauty have emerged in many cities. As one of the main types of urban landscape bridges, suspension bridges are light in structure and graceful in shape. The urban landscape suspension bridge is different from the traditional suspension bridge. In order to meet the needs of the landscape, the bridge tower is often higher than the traditional suspension bridge tower, and the slope of the main cable is steep, which causes great difficulties to the actual construction. Based on this, this paper expounds the classification of suspension bridge and the characteristics of its force system, summarizes the structure selection of urban landscape bridge, and combines with the engineering example of ground anchor suspension bridge through Nanbailu Chaohe Bridge. The self-anchored suspension bridge system conversion construction method is used to monitor the ground anchor suspension bridge. Before the implementation of monitoring, the main cable and cable tower are simulated and analyzed by using the bridge finite element software MIDAS/Civil and ANSYS respectively. Monitoring the alignment, elevation and strain of tower column and main beam, guiding cable adjustment scheme, and analyzing the data of stress, cable force, line shape and temperature of bridge structure during the whole construction process. The main conclusions are as follows: (1) the entry temperature of mass concrete such as cable tower cap and Anchorage is 26.3 鈩，

本文編號(hào)：2316261