本文關(guān)鍵詞：預(yù)應(yīng)力混凝土橋梁徐變計(jì)算方法及應(yīng)用分析　出處：《長(zhǎng)沙理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 預(yù)應(yīng)力混凝土橋梁 徐變 徐變內(nèi)力分析 徐變計(jì)算模式 徐變變形

【摘要】：隨著現(xiàn)代橋梁建設(shè)的不斷發(fā)展,預(yù)應(yīng)力混凝土橋梁的結(jié)構(gòu)內(nèi)力分析研究也逐漸走向成熟。而在橋梁結(jié)構(gòu)分析中,徐變對(duì)預(yù)應(yīng)力混凝土橋梁應(yīng)力應(yīng)變的影響不容忽視。本文主要的研究課題是對(duì)國(guó)內(nèi)常用規(guī)范中的徐變計(jì)算模式提出修正方法。雖然從不同的角度看,徐變對(duì)結(jié)構(gòu)或構(gòu)件的性能會(huì)產(chǎn)生有利或不利的效果,但是若不計(jì)徐變的影響或計(jì)算方法簡(jiǎn)單粗略,則無(wú)法定性地判斷徐變的具體影響效果和程度。一方面,預(yù)應(yīng)力混凝土結(jié)構(gòu)或構(gòu)件會(huì)因徐變而出現(xiàn)應(yīng)變過(guò)度變化的情況,使預(yù)應(yīng)力損失大大增加的不利影響。另一方面,預(yù)設(shè)橋梁預(yù)拱度的徐變變形計(jì)算是大跨度預(yù)應(yīng)力混凝土橋梁的線(xiàn)型控制與計(jì)算中的一項(xiàng)十分重要的內(nèi)容。所以選擇合理的徐變計(jì)算模式并正確有效地運(yùn)用于結(jié)構(gòu)的徐變分析,是徐變計(jì)算分析領(lǐng)域很值得研究的一個(gè)方向�；诖�,論文在開(kāi)展了以下主要的研究工作:本文針對(duì)預(yù)應(yīng)力混凝土橋梁的徐變內(nèi)力分析,整理了國(guó)內(nèi)外關(guān)于構(gòu)件和結(jié)構(gòu)中徐變方面的研究成果,闡述了徐變產(chǎn)生的機(jī)理和影響因素,綜述了徐變的計(jì)算理論、計(jì)算模式和徐變對(duì)構(gòu)件和結(jié)構(gòu)的應(yīng)力變化、橋梁線(xiàn)型的影響。在分析徐變的重要影響因素基礎(chǔ)上,探討了構(gòu)件徐變參數(shù)敏感性問(wèn)題。其中重點(diǎn)對(duì)徐變名義參數(shù)敏感性作出了分析,通過(guò)改變其增量研究徐變參數(shù)敏感性對(duì)構(gòu)件應(yīng)力和線(xiàn)型的影響程度�；谟邢拊治龅氖侄�,結(jié)合國(guó)內(nèi)外四個(gè)徐變計(jì)算模式,分別計(jì)算實(shí)際工程中的剛構(gòu)橋的徐變,并分析四個(gè)規(guī)范得到的數(shù)據(jù),利用其應(yīng)力和位移數(shù)據(jù),計(jì)算出四個(gè)規(guī)范計(jì)算結(jié)果中每組所對(duì)應(yīng)單元應(yīng)力或節(jié)點(diǎn)的位移結(jié)果的差值,統(tǒng)計(jì)得出四種規(guī)范對(duì)修正的徐變系數(shù)影響各自所占百分比的相應(yīng)比例,再根據(jù)統(tǒng)計(jì)結(jié)果把四種規(guī)范徐變系數(shù)曲線(xiàn)擬合為一合理的徐變系數(shù)曲線(xiàn)�；贘TGD62-2004規(guī)范中的徐變系數(shù)公式,把擬合出的徐變系數(shù)曲線(xiàn)與原規(guī)范的徐變系數(shù)曲線(xiàn)進(jìn)行對(duì)比,從而找出所需的函數(shù)關(guān)系,并作為修正系數(shù)Ψ的表達(dá)公式。
[Abstract]:With the continuous development of modern bridge construction, the internal force analysis of prestressed concrete bridge is gradually maturing, and in the bridge structure analysis. The influence of creep on the stress and strain of prestressed concrete bridge can not be ignored. The main research topic of this paper is to propose a modified method to calculate the creep in common codes in China, although from different angles. Creep will have favorable or unfavorable effects on the performance of structures or members. However, if the effect of creep is not taken into account or the calculation method is simple and rough, it is impossible to judge qualitatively the concrete effect and degree of creep. On the one hand. Prestressed concrete structures or members will be due to creep due to excessive strain changes, so that the loss of prestressed greatly increased the adverse impact. On the other hand. The calculation of creep deformation of preset bridge pre-arch is one of the most important contents in the linear control and calculation of long-span prestressed concrete bridge. Therefore, a reasonable creep calculation model is selected and applied to the structure correctly and effectively. Creep analysis. It is a direction worth studying in the field of creep calculation and analysis. Based on this, the thesis has carried out the following main research work: this paper aims at the analysis of creep internal force of prestressed concrete bridge. This paper summarizes the research results of creep in components and structures at home and abroad, expounds the mechanism and influencing factors of creep, and summarizes the calculation theory, calculation model and stress variation of creep on members and structures. On the basis of analyzing the important influencing factors of creep, the sensitivity of creep parameters is discussed, and the sensitivity of nominal creep parameters is mainly analyzed. By changing its increment, the influence of creep parameter sensitivity on stress and line shape of member is studied. Based on the method of finite element analysis, four creep calculation models at home and abroad are combined. The creep of the rigid frame bridge in practical engineering is calculated, and the data obtained from the four codes are analyzed, and the stress and displacement data are used. The difference between the stress of each group and the displacement of the node in each group is calculated, and the corresponding proportion of the percentage of the four codes affecting the modified creep coefficient is obtained. According to the statistical results, the creep coefficient curves of the four specifications are fitted to a reasonable creep coefficient curve, which is based on the creep coefficient formula in JTGD62-2004 code. The fitted creep coefficient curve is compared with the original standard creep coefficient curve, and the required functional relationship is found out, which can be used as the expression formula of modified coefficient 蠄.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U441;U448.35

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