Analysis of creepage and deformation of ballastless track beam for jinbin light rail 津?yàn)I輕軌無(wú)碴軌道橋梁徐變變形分析
By on - site experiment to reinforced columns during the construction period , the columns " total strain including shrinkage and creep in construction circumstance was obtained , and curves of strain development was made 本文通過(guò)對(duì)在建工程的鋼筋混凝土柱進(jìn)行施工期間的包括收縮徐變變形值的現(xiàn)場(chǎng)測(cè)量,得到施工條件下鋼筋混凝土柱應(yīng)變發(fā)展曲線,其結(jié)果具有現(xiàn)實(shí)意義。
And these changes will affect the stress and strain of the structure , then the deflection . the deflection upwards exceeding reasonable value will bring difficulty for high speed running and increase the impact effect , causing the intensive shake of the bridge 混凝土的收縮徐變變形及預(yù)應(yīng)力鋼束的松弛是與時(shí)間有關(guān)的變形性質(zhì),它們隨時(shí)間的變化會(huì)引起結(jié)構(gòu)中應(yīng)力應(yīng)變的變化,進(jìn)而導(dǎo)致結(jié)構(gòu)的撓度變化。
The results showed that the long - term deformations of beams strengthened with cfrp laminates are less than the deformations of plain beams by 6 % 16 . 5 % . on the same long - term load , with the process of strengthening changed , the creep deformations of strengthed beams were different 結(jié)果表明: cfrp布加固梁徐變比普通混凝土梁減少6 % 16 . 5 % ,并且相同的長(zhǎng)期荷載作用下,加固歷程不同,其徐變變形也不同。
The temperature field and thermal stress are derived through the finite element analysis . according to consideration of restriction and creep deform in mass concrete , the temperature field and thermal stress are simulated through the finite element program ansys 并考慮混凝土的內(nèi)外約束及混凝土的徐變變形,用有限元法求解混凝土不利面的溫度應(yīng)力,并用大型有限元軟件ansys對(duì)溫度場(chǎng)和應(yīng)力場(chǎng)進(jìn)行了模擬。
4 . the recurrence formula of the creep strain is the key of fem calculation of creep stress . in this paper the exponential function is used to figure the creep strain , and the recurrence formula of 3d creep strain at any periond of time is derivated 徐變變形遞推計(jì)算公式是溫度徐變應(yīng)力有限元計(jì)算實(shí)現(xiàn)的關(guān)鍵所在,本文用指數(shù)函數(shù)式表示徐變度,在此基礎(chǔ)上,對(duì)三維空間問(wèn)題徐變變形進(jìn)行了研究,推導(dǎo)了任一時(shí)段徐變?cè)隽康倪f推計(jì)算公式。
Using the time dependent finite element method of age - adjusted effective modulus , the author calculates the deflection which is induced by shrinkage and creep in a continuous rigid frame bridge of urban rail transit , and further compares with the site test result , the conclusion is very meaningful 摘要采用按齡期調(diào)整有效模量的時(shí)變分析有限元法,對(duì)城市軌道交通預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋的收縮徐變變形進(jìn)行了理論計(jì)算,并與實(shí)測(cè)結(jié)果進(jìn)行了對(duì)比分析,結(jié)果表明理論計(jì)算是可信的。
In the end , the steel - reinforced concrete arched bridge ( chun ' an weiping bridge ) , which span is 198m , is analyzed by the proposed three - dimensional nonlinear finite element method and also those gained conclusions are directly adopted in the computation . the universal stability coefficient and nonlinear buckling stability coefficient of the bridge are respectively computed , in which the dead load and the live load are assembled according to the criterion . on the other side , the regularities of creep deformation and subsidiary stress of the investigated bridge under the first - stage dead load are carefully researched 最后,將本文所提出的三維非線性分析方法及其主要研究成果直接應(yīng)用于198m跨勁型骨架式鋼管混凝土拱橋“淳安威坪大橋”的分析計(jì)算中,對(duì)該橋在最不利恒載和活載組合下的一般特征值失穩(wěn)系數(shù)和非線性屈曲系數(shù)進(jìn)行了對(duì)比研究,并對(duì)一期恒載長(zhǎng)期作用下該橋的徐變變形、附加應(yīng)力以及截面應(yīng)力、應(yīng)變重分布規(guī)律分別進(jìn)行了深入研究。
Hyperbola model of mgo - mixed concrete ' s autogeny deformation , especially deduce of the model ' s parameter and building process of the model are analyzed in detail . ( 2 ) calculating method of autogeny deformation and creep are discussed . based on these , timely - simulation theory of dam body ' s temperature field stress field and pre - process back - process method are mainly studied ( 2 )對(duì)mgo混凝土的自生體積變形及徐變變形的計(jì)算方法進(jìn)行了探討,在此基礎(chǔ)上,重點(diǎn)研究了壩體溫度場(chǎng)和應(yīng)力場(chǎng)實(shí)時(shí)仿真的原理以及前后處理方法。