【摘要】：大跨徑連續(xù)剛構(gòu)橋在預(yù)應(yīng)力張拉期間的質(zhì)量對(duì)橋梁服役期間的耐久性、安全性起決定性作用。但我國現(xiàn)行規(guī)范對(duì)于預(yù)應(yīng)力張拉的施工過程,尤其是采用多頂快速張拉過程沒有明確的定量規(guī)定,因此由張拉次序不當(dāng)所引起的預(yù)應(yīng)力損失較設(shè)計(jì)值偏大的現(xiàn)象較為普遍。本文針對(duì)張拉過程中有效預(yù)應(yīng)力的儲(chǔ)備問題,擬結(jié)合在建的昭麻高速腰巖特大橋工程,通過數(shù)值仿真技術(shù)與室內(nèi)試驗(yàn)及現(xiàn)場工程化試驗(yàn)相結(jié)合的研究方法,給出具有較高精度的預(yù)應(yīng)力結(jié)構(gòu)模型的構(gòu)建方法。通過研究多頂預(yù)應(yīng)力同步張拉順序,提出預(yù)應(yīng)力張拉標(biāo)準(zhǔn)化施工技術(shù)原則。通過分析不同張拉順序下結(jié)構(gòu)的預(yù)應(yīng)力效應(yīng),最終給出連續(xù)剛構(gòu)橋預(yù)應(yīng)力砼標(biāo)準(zhǔn)化快速施工方案。本文主要研究內(nèi)容及結(jié)論如下：首先,開展了預(yù)應(yīng)力簡支梁的室內(nèi)張拉試驗(yàn),運(yùn)用降溫法建立數(shù)值模型對(duì)試驗(yàn)梁的張拉過程進(jìn)行模擬。通過對(duì)比試驗(yàn)數(shù)據(jù)來修正模型參數(shù),給出具有較高精度的構(gòu)建預(yù)應(yīng)力模型的方法。其次,基于多階段施工全過程分析的理論,采用驗(yàn)證后的模擬方法,建立連續(xù)剛構(gòu)橋懸臂施工節(jié)段預(yù)應(yīng)力張拉過程的數(shù)值模型。主要研究了縱向預(yù)應(yīng)力束在對(duì)稱張拉和非對(duì)稱張拉時(shí)的預(yù)應(yīng)力效應(yīng),提出在同一截面上無法滿足對(duì)稱張拉的條件下,至少保證“左右對(duì)稱、先張拉頂板束后張拉腹板束”,且優(yōu)先張拉靠近截面中心線的原則。最后,通過不同張拉次序開展批量數(shù)值計(jì)算,對(duì)比研究墩頂0號(hào)塊、1號(hào)塊的變形與應(yīng)力,提出多頂同步張拉的最優(yōu)施工次序。上述研究有助于準(zhǔn)確模擬預(yù)應(yīng)力張拉的施工過程,分析結(jié)構(gòu)在不同張拉順序下的有效預(yù)應(yīng)力的建立過程；同時(shí),為連續(xù)剛構(gòu)橋預(yù)應(yīng)力砼標(biāo)準(zhǔn)化快速施工提供參考。
[Abstract]:The quality of long span continuous rigid frame bridge during prestress tensioning plays a decisive role in the durability and safety of the bridge during service. However, the construction process of prestress tensioning, especially the use of multi-roof rapid tensioning process, is not clearly and quantitatively stipulated in the current code of our country, so the phenomenon that the prestress loss caused by improper tensioning sequence is larger than the design value is more common. In this paper, aiming at the problem of effective prestress reserve in tension process, the research method of combining numerical simulation technology with indoor test and field engineering test is proposed to combine the Zhaomai high-speed waist rock bridge under construction. The construction method of prestressed structure model with high precision is given. By studying the synchronous tensioning sequence of multi-top prestress, the technical principle of standardization construction of prestress tensioning is put forward. Based on the analysis of the prestressing effect of the structure under different tensioning sequence, the standardized and fast construction scheme of prestressed concrete for continuous rigid frame bridge is presented. The main contents and conclusions of this paper are as follows: first, the indoor tensile tests of prestressed simply supported beams are carried out, and the numerical model of the test beams is established by using the cooling method to simulate the tensile process of the test beams. By comparing the experimental data to modify the model parameters, the method of constructing prestress model with high accuracy is given. Secondly, based on the theory of multi-stage construction whole process analysis, the numerical model of prestressed tensioning process of cantilever construction section of continuous rigid frame bridge is established by using the verified simulation method. In this paper, the prestressing effect of longitudinal prestressing beam in symmetrical tension and asymmetric tension is studied. It is proposed that under the condition that symmetrical tension can not be satisfied on the same section, at least "left and right symmetry, first stretching roof beam and then stretching web bundle" are guaranteed. And the principle of drawing close to the center line of section is preferred. Finally, through the batch numerical calculation in different tensioning order, the deformation and stress of block 0 and block 1 at the top of the pier are comparatively studied, and the optimal construction sequence of multi-roof synchronous tensioning is put forward. The above research is helpful to accurately simulate the construction process of prestressed tensioning and to analyze the establishment process of effective prestress of structure under different tensioning sequence, and to provide a reference for the standardization and rapid construction of prestressed concrete of continuous rigid frame bridge.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.57

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本文編號(hào)：2143409