本文選題：勁性骨架拱橋 + 穩(wěn)定性��； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：本文以主跨為416 m上承勁性骨架拱橋?yàn)楣こ瘫尘?在現(xiàn)有混凝土結(jié)構(gòu)徐變穩(wěn)定性分析理論的基礎(chǔ)上,對(duì)大跨度勁性骨架拱橋徐變穩(wěn)定性進(jìn)行了深入研究,主要研究工作如下:①通過混凝土結(jié)構(gòu)徐變穩(wěn)定性理論研究,得出了桿系結(jié)構(gòu)有限元徐變穩(wěn)定通用方法,在此基礎(chǔ)上,提出了通過引用按齡期調(diào)整有效模量法與有限元軟件Midas/civil結(jié)合的方法求解結(jié)構(gòu)徐變穩(wěn)定性的實(shí)用算法。通過對(duì)比軸心受壓柱徐變穩(wěn)定的理論計(jì)算值與本文所提出方法的計(jì)算結(jié)果以及對(duì)比參考文獻(xiàn)中的單圓管鋼管混凝土拱助算例結(jié)果與本文所提出方法的計(jì)算結(jié)果,驗(yàn)證了本文提出方法的正確性。②以主跨為416 m上承式鋼筋混凝土拱橋?yàn)楣こ瘫尘?分析了混凝土徐變對(duì)勁性骨架拱肋施工階段靜力性能的影響。運(yùn)用本文提出的方法研究了混凝土徐變對(duì)勁性骨架拱肋施工階段穩(wěn)定性的影響,結(jié)果表明:徐變對(duì)結(jié)構(gòu)豎向位移產(chǎn)生較明顯的影響,拱頂截面的徐變位移所占比值從最初的3.6%增長(zhǎng)到拱肋成型階段時(shí)的31.0%。隨著施工階段的進(jìn)行,拱圈混凝土所起到的承壓作用越來越明顯,穩(wěn)定系數(shù)總體上呈逐漸增大趨勢(shì)。③采用本方法,研究了混凝土徐變對(duì)大跨度勁性骨架拱橋成橋后結(jié)構(gòu)的力學(xué)性能及穩(wěn)定性的影響。結(jié)果表明:混凝土徐變效應(yīng)在前10年對(duì)拱肋豎向位移的影響十分顯著,相比之下,在拱肋成型10年之后,豎向位移的增值越來越小,趨于穩(wěn)定�；炷列熳冃�(yīng)的影響下,鋼管混凝土勁性骨架拱肋的穩(wěn)定性在成橋后10年內(nèi)下降最為明顯,第十年時(shí)穩(wěn)定系數(shù)下降了36%。10年之后,拱肋的穩(wěn)定系數(shù)下降緩慢,到第50年時(shí),穩(wěn)定值下降接近40%。
[Abstract]:In this paper, the creep stability of large-span rigid frame arch bridge is deeply studied on the basis of the existing theory of creep stability analysis of concrete structures, with the main span of 416m bearing rigid skeleton arch bridge as the engineering background. The main research work is as follows: through the theoretical study of creep stability of concrete structures, a universal finite element creep stability method for bar structures is obtained, and on this basis, A practical method for calculating the creep stability of structures is presented by using the method of adjusting effective modulus according to the age and the finite element software Midas/civil. By comparing the calculated values of creep stability of axially compressed columns with the results of the method presented in this paper, and comparing the calculation results of concrete filled steel tubular concrete filled steel tube arch with those of the method presented in this paper, The correctness of the method proposed in this paper is verified. 2. Based on the engineering background of 416m supported reinforced concrete arch bridge with main span of 416m, the influence of the static behavior of concrete creeping skeleton arch rib in construction stage is analyzed. By using the method proposed in this paper, the effect of concrete creep on the stability of the arch rib during construction is studied. The results show that the creep has an obvious effect on the vertical displacement of the structure. The ratio of creep displacement of arch section increased from 3.6% to 31.0% in the forming stage of arch rib. With the development of construction stage, the bearing pressure of arch ring concrete becomes more and more obvious, and the stability coefficient of arch ring concrete increases gradually with the use of this method. The effect of concrete creep on the mechanical properties and stability of long-span rigid frame arch bridge after completion is studied. The results show that the concrete creep effect has a significant effect on the vertical displacement of arch rib in the first 10 years, but after 10 years of arch rib forming, the increment of vertical displacement becomes smaller and more stable. Under the influence of concrete creep effect, the stability of concrete-filled steel tubular rigid skeleton arch rib decreases most obviously within 10 years after the bridge is completed, and the stability coefficient of arch rib decreases slowly after 36.10 years in the tenth year, and the stability coefficient of arch rib decreases slowly at the fiftieth year. The stable value drops by nearly 40.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441;U448.22

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本文編號(hào)：1801930