本文選題：自適應(yīng)控制 + 連續(xù)梁橋��； 參考：《沈陽(yáng)建筑大學(xué)》2015年碩士論文

【摘要】：伴隨著經(jīng)濟(jì)的發(fā)展,我國(guó)的交通事業(yè)也在不斷地發(fā)展,預(yù)應(yīng)力連續(xù)梁橋在我國(guó)橋梁建設(shè)上具有舉足輕重的地位。但無(wú)論是公路連續(xù)梁橋還是鐵路連續(xù)梁橋,在施工時(shí)都或多或少的會(huì)出現(xiàn)施工線形與設(shè)計(jì)線形以及梁體受力與設(shè)計(jì)值之間的差異。因此,為確保預(yù)應(yīng)力連續(xù)梁橋在施工和成橋后能達(dá)到設(shè)計(jì)線形和受力要求,有必要在施工過(guò)程中進(jìn)行監(jiān)控。在施工過(guò)程中橋梁的撓度和受力受到諸多因素的影響,例如量測(cè)誤差、各種參數(shù)誤差,如果這些誤差在施工過(guò)程中不能及時(shí)修正,將會(huì)導(dǎo)致合龍困難,橋面線形呈波浪形,并會(huì)影響橋梁的安全,降低使用壽命。本文以頭道松花江大橋?yàn)楣こ瘫尘?結(jié)合自適應(yīng)最優(yōu)控制理論,并總結(jié)國(guó)內(nèi)外預(yù)應(yīng)力連續(xù)梁橋成功的監(jiān)控實(shí)例,提出了一些新的監(jiān)控理念和措施,并形成了一套監(jiān)控理論和流程,運(yùn)用這套理論指導(dǎo)頭道松花江大橋施工時(shí)取得了較好的效果。本文主要研究了：1、調(diào)研了國(guó)內(nèi)外預(yù)應(yīng)力連續(xù)梁橋的發(fā)展以及監(jiān)控理論和方法。2、介紹了施工控制的主要內(nèi)容,并分析了正裝分析法、倒裝分析法、無(wú)應(yīng)力狀態(tài)分析法三種方法的差異,探究了施工控制的發(fā)展思想。3、總結(jié)分析了預(yù)拱度的三種計(jì)算方法,并對(duì)多種撓度計(jì)算方法進(jìn)行比較。4、應(yīng)用大型有限元軟件MIDAS/CIVIL對(duì)頭道松花江大橋進(jìn)行仿真計(jì)算和模擬分析,并進(jìn)行參數(shù)敏感性分析,通過(guò)分析發(fā)現(xiàn),自重和預(yù)應(yīng)力是影響橋梁撓度和應(yīng)力的主要參數(shù)。針對(duì)施工中出現(xiàn)的測(cè)量誤差、施工誤差和參數(shù)誤差,運(yùn)用Kalman濾波法將施工誤差和測(cè)量誤差濾去,并運(yùn)用最小二乘法估計(jì)參數(shù),使得模型誤差得以修正。5、對(duì)本大橋的監(jiān)控研究采用自適應(yīng)監(jiān)控理論,根據(jù)施工階段的劃分,將分為兩個(gè)階段進(jìn)行自適應(yīng)過(guò)程的控制。由于懸臂施工的前5#塊受溫度的影響較小,沒有考慮溫度的影響,將其列為第一階段的控制,5#塊之后溫度的影響就不容忽視了,這時(shí)將考慮溫度影響后的控制列為第二階段的控制。6、以頭道松花江大橋的施工控制過(guò)程為實(shí)例,介紹了施工控制的全過(guò)程和詳細(xì)內(nèi)容,例如：傳感器的布設(shè)、應(yīng)力的量測(cè)、撓度測(cè)量、誤差識(shí)別、立模標(biāo)高的調(diào)整等。在第二階段的控制中,考慮溫度效應(yīng)后再結(jié)合Kalman濾波法,能夠較準(zhǔn)確地分析識(shí)別出施工過(guò)程中的各種誤差,從而可以提供較為精確的施工預(yù)拱度,及時(shí)調(diào)整立模標(biāo)高,為橋梁的理想線形、合理受力以及順利合龍打下了基礎(chǔ)。控制結(jié)果表明,運(yùn)用二階段控制法對(duì)線形進(jìn)行控制。在大橋合攏后,根據(jù)實(shí)測(cè)值與理論值的對(duì)比分析,線形的最大偏差僅1.3cm,撓度控制在允許的誤差20mm范圍以內(nèi),并且橋梁整體線形平順,應(yīng)力監(jiān)測(cè)結(jié)果也在容許的范圍內(nèi)。
[Abstract]:With the development of economy, the transportation industry of our country is developing constantly, and the prestressed continuous beam bridge plays an important role in the bridge construction of our country. However, whether highway continuous beam bridge or railway continuous beam bridge, there will be more or less the difference between the construction line and the design line, and between the beam force and the design value. Therefore, in order to ensure that the prestressed continuous beam bridge can meet the design line and force requirements after the construction and completion of the bridge, it is necessary to monitor the construction process. In the process of construction, the deflection and force of the bridge are affected by many factors, such as measurement error, various parameter errors, if these errors can not be corrected in time during the construction process, it will lead to the closure difficulty, and the line shape of the bridge deck will be wave-shaped. It will affect the safety of the bridge and reduce the service life. In this paper, based on the engineering background of Songhua River Bridge, combining with the theory of adaptive optimal control, and summarizing the successful monitoring examples of prestressed continuous beam bridge at home and abroad, some new monitoring ideas and measures are put forward. A set of monitoring theory and flow are formed, which is used to guide the construction of Songhua River Bridge. This paper mainly studies the development of prestressed continuous beam bridge at home and abroad, and introduces the main contents of construction control. The difference of three methods of stress free state analysis is discussed, the development thought of construction control is explored, and three calculation methods of pre-arch degree are summarized and analyzed. In this paper, several deflection calculation methods are compared. Finally, a large finite element software Midas / CIVIL is used to simulate and analyze Songhua River Bridge in Tou Dao, and the sensitivity of parameters is analyzed. Weight and prestress are the main parameters that affect the deflection and stress of the bridge. Aiming at the measurement error, construction error and parameter error in construction, the Kalman filter method is used to filter the construction error and measurement error, and the least square method is used to estimate the parameters. The model error can be corrected .5. the adaptive monitoring theory is adopted in the monitoring research of this bridge. According to the division of construction stage, the adaptive process is controlled in two stages. Because the influence of temperature on the front block of cantilever construction is small, the influence of temperature on the first stage of the control block can not be ignored. At this time, the control after considering the influence of temperature is listed as the control of the second stage. Taking the construction control process of Songhua River Bridge in Toutou Road as an example, the whole process and detailed contents of construction control are introduced, such as the installation of sensors and the measurement of stress. Deflection measurement, error identification, elevation adjustment of vertical die, etc. In the control of the second stage, considering the temperature effect and combining with the Kalman filtering method, we can accurately analyze and identify all kinds of errors in the construction process, so as to provide more accurate construction camber and adjust the elevation of the vertical formwork in time. It lays the foundation for the ideal alignment, reasonable force and smooth closure of the bridge. The control results show that the two-stage control method is used to control the alignment. After the closure of the bridge, according to the comparison and analysis between the measured and theoretical values, the maximum deviation of the linear shape is only 1.3 cm, the deflection is controlled within the allowable error 20mm range, and the overall alignment of the bridge is smooth, and the stress monitoring results are within the allowable range.
【學(xué)位授予單位】：沈陽(yáng)建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U446

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本文編號(hào)：2093888