【摘要】：PC連續(xù)剛構(gòu)橋是公路橋梁中常見(jiàn)的橋型之一，如何快速、準(zhǔn)確、經(jīng)濟(jì)地對(duì)橋梁結(jié)構(gòu)進(jìn)行承載力檢測(cè)已成為國(guó)內(nèi)外橋梁界的研究熱點(diǎn)。目前，我國(guó)已建成的高墩大跨預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋荷載試驗(yàn)測(cè)試并沒(méi)有統(tǒng)一的規(guī)范標(biāo)準(zhǔn)可以參考，承擔(dān)測(cè)試的單位基本上都是依照專業(yè)通用標(biāo)準(zhǔn)、專業(yè)專用標(biāo)準(zhǔn)以及已有的PC連續(xù)剛構(gòu)橋荷載試驗(yàn)測(cè)試項(xiàng)目及加載工況。因此高墩大跨PC連續(xù)剛構(gòu)橋荷載試驗(yàn)在荷載效率系數(shù)的取值、荷載試驗(yàn)工況的選取、校驗(yàn)系數(shù)的合理取值范圍等方面還不是很完善。因此，有必要對(duì)上述問(wèn)題進(jìn)行研究。 針對(duì)目前高墩大跨PC連續(xù)剛構(gòu)橋荷載試驗(yàn)存在的這些問(wèn)題，本文主要研究了以下三個(gè)方面的問(wèn)題： （1）對(duì)高墩大跨PC連續(xù)剛構(gòu)橋荷載效率系數(shù)進(jìn)行了降低優(yōu)化研究。本文以湖北省宜昌市魏家洲特大橋荷載試驗(yàn)工況為例，，對(duì)其第一工況和第四工況的荷載效率系數(shù)進(jìn)行了優(yōu)化研究，最后以湖北省興山縣竹溪墓大橋荷載效率系數(shù)的降低優(yōu)化為例，驗(yàn)證了本文所提方法在實(shí)際工程中的實(shí)用性與準(zhǔn)確性。 （2）根據(jù)高墩大跨PC連續(xù)剛構(gòu)橋自身結(jié)構(gòu)特點(diǎn)，提出了荷載試驗(yàn)加載工況的合并優(yōu)化問(wèn)題，即將多個(gè)荷載試驗(yàn)加載工況合并成一個(gè)試驗(yàn)工況進(jìn)行加載測(cè)試。最后，以三水河特大橋的荷載試驗(yàn)工況優(yōu)化為例，確定了高墩大跨PC連續(xù)剛構(gòu)橋結(jié)構(gòu)可以進(jìn)行合并的工況。 （3）分部位對(duì)高墩大跨PC連續(xù)剛構(gòu)橋主梁的校驗(yàn)系數(shù)取值范圍進(jìn)行了研究。確定出了高墩大跨PC連續(xù)剛構(gòu)橋主梁各部位校驗(yàn)系數(shù)服從95%置信區(qū)間的取值范圍，并把校驗(yàn)系數(shù)的取值范圍分為A類、B類、C類、D類、E類5個(gè)類別。 通過(guò)對(duì)魏家洲特大橋及竹溪墓大橋荷載效率系數(shù)的優(yōu)化研究，可以確定高墩大跨PC連續(xù)剛構(gòu)橋荷載效率系數(shù)的取值可以適當(dāng)降低；通過(guò)對(duì)三水河特大橋荷載試驗(yàn)工況的優(yōu)化研究，可以得出第11跨和第14跨主梁最大正彎矩工況和撓度工況可以合并為一個(gè)工況；通過(guò)分析國(guó)內(nèi)大量高墩大跨PC連續(xù)剛構(gòu)橋主梁各部位校驗(yàn)系數(shù)，可以得出高墩大跨PC連續(xù)剛構(gòu)橋主梁主要測(cè)試工況校驗(yàn)系數(shù)的合理取值范圍。
[Abstract]:PC continuous rigid frame bridge is one of the most common bridge types in highway bridges. How to test the bearing capacity of bridge structures quickly, accurately and economically has become a hot research topic in the field of bridges at home and abroad. At present, there is no uniform standard for load test of long-span prestressed concrete continuous rigid frame bridges with high piers built in our country. The units that undertake the tests are basically in accordance with the general professional standards. Professional standards and existing PC continuous rigid frame bridge load test items and loading conditions. Therefore, the load test of PC continuous rigid frame bridge with high pier and long span is not perfect in terms of load efficiency coefficient, load test condition, reasonable range of check coefficient and so on. Therefore, it is necessary to study the above problems. Aiming at these problems existing in load test of PC continuous rigid frame bridge with high pier and long span, this paper mainly studies the following three problems: (1) the load efficiency coefficient of PC continuous rigid frame bridge with high pier and long span is reduced and optimized. In this paper, the load efficiency coefficients of Weijiazhou Bridge in Yichang City, Hubei Province, are optimized under the first and fourth working conditions. Finally, taking the reduction and optimization of load efficiency coefficient of Zhuxi Tomb Bridge in Xingshan County, Hubei Province as an example, the practicability and accuracy of the proposed method in practical engineering are verified. (2) according to the structural characteristics of PC continuous rigid frame bridge with high piers and large spans, The combined optimization problem of load test loading condition is put forward, which combines multiple load test conditions into one test condition to carry out load test. Finally, taking the load test condition optimization of Sanshui River Bridge as an example, The condition that the structure of PC continuous rigid frame bridge with high pier and long span can be combined is determined. (3) the range of check coefficient of the main beam of PC continuous rigid frame bridge with high pier and long span is studied. The range of check coefficient of each part of PC continuous rigid frame bridge with high pier and long span is determined from 95% confidence interval, and the range of check coefficient is divided into five categories: class A, class B, class C, class D and class E. Based on the optimization of load efficiency coefficients of Weijiazhou Bridge and Zhuxi Tomb Bridge, it can be determined that the load efficiency coefficient of PC continuous rigid frame bridge with high piers and long span can be reduced appropriately. By optimizing the load test conditions of Sanshuihe Bridge, it can be concluded that the maximum positive moment and deflection of the 11th span and the 14th span of the main girder can be combined into one working condition. By analyzing the check coefficients of the main beam of a large number of high pier and long span PC continuous rigid frame bridges in China, the reasonable range of the check coefficients of the main girder of the high pier and long span PC continuous rigid frame bridge under the main test conditions can be obtained.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U446.1

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