【摘要】：隨著交通量的日益增長,我國的許多簡支梁橋在服役多年后出現(xiàn)伸縮縫破損的病害并誘發(fā)其他相關(guān)病害,嚴重影響交通服務(wù)功能,甚至危及交通安全和結(jié)構(gòu)安全。雖然新型伸縮縫構(gòu)造和材料不斷出現(xiàn),但是問題一直沒有得到根本性的解決。為此,本文以既有多跨空心板簡支梁的連續(xù)化改造為研究對象,以福建漳州十里橋為工程背景,對改造后全橋的整體受力性能、新舊混凝土結(jié)合面局部進行分析,并提出AHP(層次結(jié)構(gòu)分析)數(shù)學(xué)模型對改造后支座選型進行優(yōu)化分析。主要工作和研究內(nèi)容如下：(1)依據(jù)福建漳州十里橋外觀檢測和環(huán)境脈動、動力響應(yīng)試驗的結(jié)果,對全橋進行現(xiàn)役承載力評定。并通過借鑒國內(nèi)外經(jīng)驗,選擇空心板梁簡支連續(xù)化改造方案。(2)對多跨空心板梁簡支連續(xù)化改造效應(yīng)進行分析。連續(xù)化改造后,恒載作用下跨中正彎矩有所降低,最大降低26.4%；改造后活載承載能力提高較明顯,活載提高值為改造前的1.45～1.65倍；連續(xù)化改造后,邊跨最外側(cè)的支座處剪力比改造前有降低了6.8%～7.6%；其余支座處的剪力要比改造前增大5.6%～8.4%。(3)基于Midas-FEA程序?qū)招陌辶哼B續(xù)化改造墩頂處應(yīng)力分析。結(jié)果表明由于墩頂正負彎矩的存在,引起支座處最不利位置處的最小主應(yīng)力出現(xiàn)反彎現(xiàn)象,造成剪力抗力值不足,建議連續(xù)化改造設(shè)計時要重點復(fù)核支座處剪力。(4)通過有限元和理論計算,對連續(xù)化改造橫向分布進行分析研究。結(jié)果表明連續(xù)化改造后,橫向分布更加均勻,增強了主梁之間的協(xié)同作用,降低了單板受力的發(fā)生概率。(5)通過有限元程序計算,計算得出新舊混凝土齡期差引起的收縮徐變彎矩值為正彎矩,對跨中受力不利�？缰袕澗刈畲笤龇鶠�3.9%；緩和了墩頂負彎矩峰值和范圍,負彎矩最大降低幅度約為4.3%,影響不明顯。(6)利用Midas-FEA程序,對新舊混凝土結(jié)合面進行局部分析。連續(xù)化改造中,新舊混凝土結(jié)合面在收縮徐變、溫度作用等荷載作用下能夠協(xié)調(diào)的工作,但是新舊混凝土結(jié)合面處抗拉應(yīng)力安全儲備較低,建議設(shè)計改造時對此位置可以通過利用微膨脹混凝土、低收縮性材料或者采用機械方式進行局部補強。(7)利用層次分析法(AHP),從荷載效應(yīng)、溫度效應(yīng)、施工條件、地質(zhì)條件四個結(jié)構(gòu)層次分析,建立單雙支座選擇方式的數(shù)學(xué)模型。通過建立的數(shù)學(xué)模型優(yōu)化分析得出漳州十里橋簡支連續(xù)化改造工程選擇雙支座。
[Abstract]:With the increasing traffic volume, many simply supported bridges in our country appear the damage of expansion joints after many years of service and induce other related diseases, which seriously affect the traffic service function, even endanger the traffic safety and structural safety. Although new expansion joint structures and materials continue to appear, but the problem has not been fundamentally resolved. Therefore, this paper takes the continuous reconstruction of the existing multi-span hollow slab simply supported beam as the research object, taking Zhangzhou Shili Bridge in Fujian as the engineering background, analyzes the overall mechanical performance of the whole bridge after the reconstruction and the part of the new and old concrete joint face. The AHP (hierarchical structure Analysis) mathematical model is put forward to optimize the support selection after the transformation. The main work and research contents are as follows: (1) the bearing capacity of the whole bridge is evaluated according to the results of exterior inspection, environmental pulsation and dynamic response test of Zhangzhou Shili Bridge in Fujian Province. By using domestic and foreign experience for reference, the continuous reconstruction scheme of simple support of hollow slab beam is selected. (2) the effect of continuous reconstruction of simple support of multi-span hollow slab beam is analyzed. After continuous transformation, the positive bending moment of span under the action of dead load decreases to a certain extent, and the maximum reduction is 26.4.The load carrying capacity of live load increases obviously after the transformation, and the improvement value of live load is 1.45 ~ 1.65 times of that before transformation. The shear force at the outermost support of the side span is reduced by 6.87.6and the shear force at the rest of the support is increased by 5.68.4. (3) the stress at the top of the continuous reconstruction of hollow slab beam is analyzed based on the Midas-FEA program. The results show that due to the existence of positive and negative moment at the top of the pier, the minimum principal stress at the most unfavorable position of the support appears reverse bending phenomenon, which results in the insufficient value of shear resistance. It is suggested that the shear force at the support should be reviewed when designing the continuous transformation. (4) the transverse distribution of the continuous transformation is analyzed and studied by finite element method and theoretical calculation. The results show that after the continuous transformation, the transverse distribution is more uniform, the synergy between the main beams is enhanced, and the probability of the stress on the veneer is reduced. (5) the finite element program is used to calculate, The results show that the shrinkage and creep moment caused by the age difference of new and old concrete is positive moment, which is unfavorable to the stress in the middle of span. The maximum increment of mid-span moment is 3.9, the peak value and range of negative moment at the top of pier are alleviated, the maximum decrease of negative moment is about 4.3, and the influence is not obvious. (6) using Midas-FEA program, the local analysis of the new and old concrete joints is carried out. In the continuous transformation, the new and old concrete joints can work harmoniously under the action of shrinkage, creep and temperature, but the safety reserve of tensile stress at the new and old concrete joints is low. It is suggested that this position can be partially strengthened by using micro-expansive concrete, low-shrinkage material or mechanical method. (7) Analytic hierarchy process (AHP),) is used to analyze the load effect, temperature effect and construction conditions. The mathematical model of the selection of single and double supports is established by analyzing the four structures of geological conditions. Through the optimization analysis of the established mathematical model, it is concluded that double supports are selected for the continuous reconstruction of the simple support of Zhangzhou Shili Bridge.
【學(xué)位授予單位】：福州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.7

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