本文選題：空心板 + 鉸縫損傷�。� 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：隨著經(jīng)濟(jì)的發(fā)展,我國高速公路上的橋梁也越來越多。有些橋梁雖然還未超過服役年限,但卻因?yàn)槌d等因素的影響使得其設(shè)計(jì)承載力已不符合現(xiàn)在的使用要求。而新建的橋梁也會因?yàn)樵O(shè)計(jì)或施工上的缺陷而發(fā)生損傷,這些損傷都不同程度上威脅了橋梁的安全。空心板橋梁由于其結(jié)構(gòu)簡單、適合標(biāo)準(zhǔn)化施工、施工方便等優(yōu)點(diǎn)而在公路橋梁被廣泛采用。由于空心板梁橋所占有的比重較大,出現(xiàn)的安全問題也相對較多。在上述背景下,本論文以空心板梁橋作為研究對象,針對其安全性評估問題展開研究,主要研究內(nèi)容包括:①首先對空心板梁橋常見病害進(jìn)行歸類分析,詳細(xì)介紹了空心板梁橋具有代表性和普遍性的病害。②以跨徑為10m的普通鋼筋混凝土空心板梁橋及13m、20m的預(yù)應(yīng)力混凝土空心板梁橋?yàn)樵?建立無損傷鉸縫、單個(gè)鉸縫損傷、相鄰兩個(gè)鉸縫損傷的Midas Fea有限元模型,分別模擬鉸縫損傷20%、40%、60%以及80%的情況。通過分析不同損傷程度下的撓度橫向分布系數(shù),確定鉸縫損傷對空心板梁橋安全性能的影響。③通過Midas Fea建立反映結(jié)構(gòu)真實(shí)狀態(tài)的10m普通鋼筋混凝土以及20m預(yù)應(yīng)力混凝土空心板梁橋有限元模型。以裂縫高度為研究參數(shù),進(jìn)行了單調(diào)加載和反復(fù)加載下的非線性有限元分析,研究空心板梁橋不同裂縫狀態(tài)下的內(nèi)力和變形情況,最終構(gòu)建空心板梁橋的基于裂縫開展程度的安全性評估技術(shù)。另外還對預(yù)應(yīng)力空心板梁橋模型的梁端縱向小裂縫進(jìn)行了分析,對其產(chǎn)生原因進(jìn)行了進(jìn)一步的分析。④將主梁受壓區(qū)混凝土應(yīng)變達(dá)到極限應(yīng)變作為前提,運(yùn)用數(shù)學(xué)計(jì)算分析手段,通過各項(xiàng)確定因素的分析,建立了運(yùn)用簡便的空心板梁橋永久性變形限值公式。然后通過Midas Civil分別建立跨徑為13m、16m、20m的預(yù)應(yīng)力混凝土空心板梁橋有限元模型,研究由于預(yù)應(yīng)力損失引起的下?lián)蠈招陌辶簶虻挠绊�。通過限值公式和有限元模擬結(jié)果的比較分析可知,永久性變形理論限值公式可以用于空心板梁橋安全性能的評定。論文的研究成果為客觀評價(jià)空心板橋的安全性提供了較好的理論和實(shí)踐依據(jù),對保證空心板梁橋的安全具有積極的現(xiàn)實(shí)意義,推廣應(yīng)用前景良好。
[Abstract]:With the development of economy, there are more and more bridges on highway in our country.Although some bridges have not exceeded their service life, the design bearing capacity of some bridges does not meet the current requirements due to the influence of overload and other factors.New bridges will also be damaged by defects in design or construction, which in varying degrees threaten the safety of bridges.Hollow slab bridges are widely used in highway bridges because of their simple structure, suitable for standardized construction and convenient construction.Because of the large proportion of hollow slab girder bridge, there are many safety problems.Under the above background, this paper takes the hollow slab girder bridge as the research object, aiming at its safety evaluation problem, the main research content includes: firstly, the common diseases of the hollow slab girder bridge are classified and analyzed.It is introduced in detail that the typical and universal disease of hollow slab girder bridge is that the common reinforced concrete hollow slab girder bridge with span of 10 m and prestressed concrete hollow slab beam bridge with 13 m or 20 m span are used as archetypes to establish the joint without damage and single joint damage.The Midas Fea finite element model for the damage of two adjacent joints is used to simulate the damage of the hinge joints by 60% and 80% respectively.By analyzing the transverse distribution coefficient of deflection under different damage degree,The influence of hinged joint damage on the safety performance of hollow slab girder bridge was determined. 3 the finite element models of 10 m ordinary reinforced concrete and 20 m prestressed concrete hollow slab girder bridge reflecting the real state of the structure were established by Midas Fea.Finally, the construction of hollow slab girder bridge based on crack development degree of safety assessment technology.In addition, the longitudinal small cracks at the beam end of the prestressed hollow slab bridge model are analyzed, and the causes are further analyzed. 4. The ultimate strain of concrete in the compression zone of the main beam is taken as the prerequisite.By means of mathematical calculation and analysis, a simple and convenient formula of permanent deformation limit of hollow slab girder bridge is established through the analysis of certain factors.By comparing the finite value formula with the finite element simulation results, it can be seen that the permanent deformation theory limit formula can be used to evaluate the safety performance of hollow slab girder bridge.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446

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本文編號：1735392