發(fā)布時(shí)間：2018-06-17 19:03

  本文選題：系桿拱橋 + 鋼管混凝土��； 參考：《蘭州交通大學(xué)》2014年博士論文

【摘要】：鋼管混凝土作為鋼管和混凝土兩種材料的最佳組合,廣泛應(yīng)用在土木工程結(jié)構(gòu)中。本文結(jié)合目前鋼管混凝土研究現(xiàn)狀,針對(duì)鋼管混凝土徐變?cè)囼?yàn)數(shù)據(jù)和現(xiàn)場(chǎng)數(shù)據(jù)較少、機(jī)理研究不足等方面存在的問(wèn)題,采用試驗(yàn)研究、理論分析、數(shù)值模擬及現(xiàn)場(chǎng)試驗(yàn)相結(jié)合的方法,系統(tǒng)地研究了鋼管混凝土收縮徐變機(jī)理及其對(duì)鋼管混凝土系桿拱橋受力性能的影響。主要研究工作如下:(1)在查閱大量國(guó)內(nèi)外文獻(xiàn)的基礎(chǔ)上,系統(tǒng)的總結(jié)了鋼管混凝土收縮徐變?cè)囼?yàn)研究、理論分析、數(shù)值計(jì)算、現(xiàn)場(chǎng)研究等方面的現(xiàn)狀。(2)以核心混凝土為研究對(duì)象,進(jìn)行限制膨脹和收縮的試件試驗(yàn),同時(shí)采用自制試驗(yàn)?zāi)Ｐ蜏y(cè)試核心混凝土在不同外加劑、不同養(yǎng)護(hù)方式下的收縮性能變化情況。(3)通過(guò)3年收縮徐變?cè)囼?yàn),共進(jìn)行51根鋼管混凝土柱徐變?cè)囼?yàn)和11根鋼管混凝土柱收縮試驗(yàn)。通過(guò)不同含鋼率、應(yīng)力比和膨脹劑摻量的試驗(yàn),分析不同影響因素下,鋼管混凝土收縮徐變性能變化規(guī)律。在試驗(yàn)的基礎(chǔ)上,得出與試驗(yàn)結(jié)果匹配的收縮徐變的數(shù)學(xué)模型。(4)對(duì)核心混凝土進(jìn)行了SEM掃描電鏡、RapidAir孔結(jié)構(gòu)分析,從微觀角度分析鋼管混凝土在不同膨脹劑摻量、不同養(yǎng)護(hù)方式條件核心混凝土徐變機(jī)理。從微觀形貌和孔結(jié)構(gòu)上論證鋼管混凝土宏觀收縮徐變的內(nèi)在原因,進(jìn)一步完善了鋼管混凝土收縮徐變機(jī)理。(5)以一實(shí)際結(jié)構(gòu)為例,通過(guò)數(shù)值模擬的方法,分析不同國(guó)家規(guī)范在計(jì)算收縮徐變方面的差異性,同時(shí)分析了系桿拱橋在不同徐變模式下,拱肋、吊桿及系梁的內(nèi)力、撓度變化情況,定量地得到了徐變對(duì)系桿拱橋的影響程度。(6)進(jìn)行了現(xiàn)場(chǎng)鋼管混凝土拱肋在不同的徐變模式作用下,核心混凝土和鋼管各自的應(yīng)力變化測(cè)試與分析,定量地分析了內(nèi)力重分布和應(yīng)力松弛。
[Abstract]:As the best combination of steel tube and concrete, concrete-filled steel tube (CFST) is widely used in civil engineering structures. According to the present research situation of concrete-filled steel tubular (CFST), this paper uses experimental research and theoretical analysis to solve the problems existing in concrete filled steel tubular concrete (CFST) creep test data and field data, and the insufficient research on mechanism, etc. The mechanism of shrinkage and creep of concrete-filled steel tubular (CFST) and its influence on the mechanical behavior of concrete-filled steel tubular tied arch bridge are systematically studied by means of numerical simulation and field test. The main research work is as follows: (1) on the basis of consulting a large number of domestic and foreign documents, the paper systematically summarizes the present situation of concrete filled steel tube (CFST) shrinkage and creep test research, theoretical analysis, numerical calculation, field research, etc.) taking the core concrete as the research object, The shrinkage behavior of the core concrete under different admixtures and different curing methods was tested by self-made test model, and the shrinkage creep test was carried out for 3 years. A total of 51 concrete filled steel tubular columns were tested by creep test and 11 concrete filled steel tubular columns were subjected to shrinkage tests. Through the tests of different steel content, stress ratio and expansion agent content, the change law of shrinkage and creep behavior of concrete-filled steel tube (CFST) was analyzed under different influence factors. On the basis of the experiment, the mathematical model of shrinkage and creep matching with the test results is obtained. The structure of the core concrete is analyzed by SEM scanning electron microscope and RapidAir pore structure, and the content of concrete filled steel tube in different expansion agent is analyzed from the microscopic point of view. Creep mechanism of core concrete under different curing conditions. The internal causes of macroscopic shrinkage and creep of concrete-filled steel tubular (CFST) are demonstrated from the microscopic morphology and pore structure, and the mechanism of shrinkage and creep of CFST is further improved. Taking a practical structure as an example, the method of numerical simulation is used. The differences in calculating shrinkage and creep of different national codes are analyzed, and the internal forces and deflection of arch ribs, suspenders and girders in different creep modes of tied arch bridges are analyzed. The degree of influence of creep on tied arch bridge is obtained quantitatively. The stress changes of core concrete and steel tube are tested and analyzed respectively under different creep modes of concrete filled steel tube arch rib in situ. The redistribution of internal force and stress relaxation are quantitatively analyzed.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U448.225

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