本文選題：寒冷地區(qū) + CRTSⅢ�。� 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：摘要：CRTSIII型板式無砟軌道是具有我國完全自主知識產(chǎn)權(quán)的新型無砟軌道結(jié)構(gòu)形式,也是目前最具發(fā)展空間的無砟軌道結(jié)構(gòu)形式之一。2013年9月開通運(yùn)營的盤-營客運(yùn)專線,是我國首條位于寒冷地區(qū)的采用CRTSIII型板式無砟軌道系統(tǒng)的客運(yùn)專線,而寒冷地區(qū)鋪設(shè)無砟軌道必須面臨低溫、凍融等導(dǎo)致軌道結(jié)構(gòu)受力狀態(tài)惡化的諸多問題。因此,對寒冷地區(qū)CRTSIII型板式無砟軌道結(jié)構(gòu)的受力特性進(jìn)行研究則顯得尤為必要。 本文以盤-營客運(yùn)專線的建設(shè)為背景,在理論分析的基礎(chǔ)上,運(yùn)用有限元軟件ABAQUS建立相應(yīng)的靜、動力分析模型,對寒冷地區(qū)CRTSIII型板式無砟軌道力學(xué)特性進(jìn)行了深入研究,具體如下： (1)針對寒冷地區(qū)氣溫低、溫差大的特點(diǎn),利用有限元軟件ABAQUS,建立寒冷地區(qū)CRTSIII型板式無砟軌道靜力分析模型。研究在不同類型溫度荷載作用下,軌道結(jié)構(gòu)的翹曲位移和應(yīng)力分布以及配筋對軌道板溫度效應(yīng)的影響情況。結(jié)果表明：寒冷地區(qū)溫度荷載作用下軌道結(jié)構(gòu)的應(yīng)力與變形較大,尤其是軌道板的受力狀態(tài)較為不利,建議在寒冷地區(qū)鋪設(shè)的CRTSIII型軌道板加強(qiáng)配筋設(shè)置,具體為：采用雙層配筋并在軌道板中部加密縱向受力鋼筋。 (2)建立軌道結(jié)構(gòu)靜力分析模型及車輛-軌道-路基耦合動力分析模型,對寒冷地區(qū)自密實(shí)混凝土出現(xiàn)傷損后,在列車荷載、列車荷載與溫度荷載共同作用下,軌道結(jié)構(gòu)的受力特性進(jìn)行研究,進(jìn)而提出對于寒冷地區(qū)自密實(shí)混凝土傷損破壞程度的限值,并通過動力分析對傷損限值的合理性進(jìn)行了驗(yàn)證。結(jié)果表明：基于軌道結(jié)構(gòu)強(qiáng)度確定的自密實(shí)混凝土傷損限值滿足動力響應(yīng)的要求。 (3)建立車輛-軌道-路基耦合動力分析模型,研究路基不均勻凍脹、融沉變形對軌道結(jié)構(gòu)動力響應(yīng)的影響規(guī)律,以及在路基出現(xiàn)不均勻凍脹與融沉變形時(shí),采取列車限速行駛的有效性及可行性。結(jié)果表明：路基凍脹與融沉變形對車體及軌道結(jié)構(gòu)動力響應(yīng)的影響較大,尤其是導(dǎo)致了軌道結(jié)構(gòu)動應(yīng)力的迅速增長；在出現(xiàn)輕微凍脹與融沉變形時(shí),采取降速措施可以起到減弱動力響應(yīng)的作用,但是隨著車速的繼續(xù)降低,對動力響應(yīng)的減弱作用趨于平緩,因此,只靠單純降低車速并不能夠起到更好的改善效果。
[Abstract]:Abstract: CRTSIII slab ballastless track is a new type of ballastless track with our country's independent intellectual property rights. It is also one of the most developed ballastless track structures, which is one of the main forms of ballastless track, which opened and operated in September,.2013, which is the first one in our country to adopt the CRTSIII type slab ballastless track system in the cold area. The ballastless track in the cold area must face the problems of low temperature and freezing thawing, which lead to the deterioration of the stress state of the track structure. Therefore, it is particularly necessary to study the stress characteristics of the CRTSIII type slab ballastless track structure in cold areas.
In this paper, based on the construction of the PDL, based on the theoretical analysis, the finite element software ABAQUS is used to establish the corresponding static and dynamic analysis model. The mechanical characteristics of the CRTSIII type slab ballastless track in cold areas are studied in detail, as follows:
(1) aiming at the characteristics of low temperature and large temperature difference in cold area, the static analysis model of CRTSIII type slab ballastless track in cold area is established by using the finite element software ABAQUS. The influence of the warpage displacement and stress distribution of the track structure and the influence of the reinforcement on the temperature effect of the track plate under different types of temperature load are studied. The results show that the cold is cold. The stress and deformation of the track structure under the temperature load of cold area is larger, especially the stress state of the track plate is more unfavorable. It is suggested that the CRTSIII type track plate which is laid in the cold area should be reinforced. The concrete is to use the double layer reinforcement and encrypt the longitudinal reinforced bar in the middle of the track plate.
(2) the static analysis model of track structure and the model of vehicle track subgrade coupled dynamic analysis are established. The stress characteristics of the track structure are studied under the joint action of train load, train load and temperature load in cold areas, and the damage process of self compacting concrete in cold areas is put forward. The limit value of the degree is verified by the dynamic analysis. The results show that the limit of the damage of the self compacting concrete based on the strength of the track structure satisfies the demand of the dynamic response.
(3) establish a vehicle track subgrade coupled dynamic analysis model to study the influence of subgrade uneven frost heave and thawing deformation on the dynamic response of the track structure, and the validity and feasibility of the train running at the speed limit when the subgrade appears uneven frost heave and thawing deformation. The results show that the Subgrade Frost heave and thawing deformation are on the car body and the rail. The dynamic response of the channel structure is greatly influenced, especially the rapid growth of the dynamic stress of the track structure. In the case of slight frost heave and thawing deformation, the speed reduction measures can play a role in weakening the dynamic response, but as the speed continues to decrease, the weakening effect of the dynamic response tends to be slow, so only by the simple reduction of the vehicle. Speed does not have a better effect.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U213.244

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本文編號：2058995