本文關(guān)鍵詞： 鋼管混凝土拱橋 徐變 收縮 靜力性能 簡(jiǎn)化計(jì)算法　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：作為一種新興的現(xiàn)代橋梁結(jié)構(gòu)形式，鋼管混凝土拱橋因其承載力高、跨越能力強(qiáng)、施工效率高、外型美觀等優(yōu)點(diǎn)在跨度70m 500m的橋梁中具有較強(qiáng)的競(jìng)爭(zhēng)力。雖然鋼管混凝土拱橋的應(yīng)用日益廣泛，但目前對(duì)鋼管混凝土拱各項(xiàng)力學(xué)性能的認(rèn)識(shí)尚不深入，限制了該類橋型的發(fā)展。鋼管混凝土拱的長(zhǎng)期靜力性能雖然得到了學(xué)術(shù)界的廣泛關(guān)注，但現(xiàn)有研究主要針對(duì)特定的橋梁開(kāi)展，且相關(guān)試驗(yàn)數(shù)據(jù)較少，不足以指導(dǎo)設(shè)計(jì)，需要進(jìn)行更加深入系統(tǒng)的研究。 本文利用ABAQUS有限元模型，對(duì)兩端固結(jié)的圓形截面鋼管混凝土拋物線單拱肋長(zhǎng)期靜力性能開(kāi)展參數(shù)分析，考慮參數(shù)包括：含鋼率、長(zhǎng)細(xì)比、加載齡期、持荷時(shí)間，其范圍根據(jù)鋼管混凝土拱橋?qū)嶋H設(shè)計(jì)參數(shù)統(tǒng)計(jì)結(jié)果確定，，研究在0.5倍極限承載力的持荷作用下，核心混凝土?xí)r效作用對(duì)不同參數(shù)的鋼管混凝土拱長(zhǎng)期撓度與截面應(yīng)力分布情況的影響，研究發(fā)現(xiàn)，拱肋核心混凝土?xí)r效作用對(duì)鋼管混凝土拱長(zhǎng)期靜力性能影響顯著，且隨拱肋參數(shù)的不同有較大差異。在此基礎(chǔ)上，基于ABAQUS有限元模型，以保證拱肋屈曲前出平面位移相同為原則，通過(guò)調(diào)整拱肋初始缺陷，建立一種可以考慮核心混凝土?xí)r效作用影響的鋼管混凝土拱承載力極限狀態(tài)出平面穩(wěn)定性能簡(jiǎn)化分析方法。由于無(wú)風(fēng)撐鋼管混凝土拱的長(zhǎng)細(xì)比較大，拱肋在發(fā)生失穩(wěn)時(shí)截面材料基本未進(jìn)入塑性，因此采用增加拱肋初始缺陷的方式考慮核心混凝土?xí)r效作用對(duì)鋼管混凝土拱出平面穩(wěn)定承載力的影響具有可行性。將該簡(jiǎn)化方法的分析結(jié)果與課題組前期建立的較為精確的分析方法的分析結(jié)果進(jìn)行對(duì)比，驗(yàn)證簡(jiǎn)化計(jì)算方法的可靠性。最后進(jìn)行鋼管混凝土拱長(zhǎng)期靜力性能試驗(yàn)方案的設(shè)計(jì)與加工準(zhǔn)備工作，用于研究核心混凝土?xí)r效作用對(duì)鋼管混凝土拱長(zhǎng)期撓度、截面應(yīng)力分布及出平面穩(wěn)定性能的影響。
[Abstract]:As a new type of modern bridge structure, concrete filled steel tube arch bridge has high bearing capacity, strong span ability and high construction efficiency. Although the application of concrete-filled steel tubular arch bridge is more and more extensive, the understanding of the mechanical properties of concrete filled steel tube arch is not deep enough at present. Although the long-term static behavior of concrete-filled steel tubular arch has been widely concerned by academia, but the existing research is mainly focused on specific bridges, and there are few experimental data, which is not enough to guide the design. More in-depth and systematic research is needed. In this paper, the ABAQUS finite element model is used to analyze the long-term static behavior of concrete-filled steel tubular concrete (CFST) single arch rib with circular section. The parameters include steel ratio, aspect ratio, loading age, loading time, and so on. The range is determined by the statistical results of actual design parameters of concrete-filled steel tube arch bridge. Under the action of 0.5 times ultimate bearing capacity, The effect of core concrete aging on the long-term deflection and section stress distribution of concrete-filled steel tube arch with different parameters is studied. It is found that the effect of core concrete aging on the long-term static performance of concrete filled steel tube arch is significant. Based on the ABAQUS finite element model and the principle of ensuring the same plane displacement before buckling of arch rib, the initial defects of arch rib are adjusted. A simplified analysis method for the ultimate state of bearing capacity of concrete-filled steel tubular arch (CFST) is established, which can take into account the effect of aging effect of core concrete. Because the length and fineness of CFST arch without wind brace is large, When the arch rib is unstable, the material of section is basically not plastic. Therefore, it is feasible to consider the effect of core concrete aging on the bearing capacity of concrete filled steel tube arch plane by increasing the initial defects of arch rib. The results of more accurate analysis methods are compared. The reliability of the simplified calculation method is verified. Finally, the design and processing preparation of the long-term static behavior test scheme of concrete-filled steel tubular arch is carried out, which is used to study the long-term deflection of concrete filled steel tube arch under the core concrete aging action. The influence of the stress distribution of the cross section and the stability of the exit plane.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.22

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