本文選題：混凝土 + 損傷參數(shù)　； 參考：《長沙理工大學(xué)》2014年碩士論文

【摘要】：近年來由于地震的頻發(fā),讓我們對地震作用下結(jié)構(gòu)的受力性能有了更進(jìn)一步的認(rèn)識,尤其是橋梁結(jié)構(gòu)作為生命線工程。橋梁結(jié)構(gòu)在地震作用下的損傷狀況直接關(guān)系到發(fā)生地震后抗震救災(zāi)通道的打開、抗震救災(zāi)物資的運(yùn)輸；一旦橋梁結(jié)構(gòu)損傷比較嚴(yán)重?zé)o法通行將會給人民生命財(cái)產(chǎn)帶來極大的損失。所以說對以混凝土材料為主的橋梁進(jìn)行損傷分析是很有必要的。本文在簡述地震反應(yīng)分析基本理論與損傷理論之后,以一多跨連續(xù)剛構(gòu)橋?yàn)楣こ瘫尘?對其進(jìn)行彈塑性時程分析及其損傷分析,主要的研究內(nèi)容包括：(1)論述了連續(xù)剛構(gòu)橋的抗震分析方法以及抗震分析現(xiàn)狀。對混凝土材料的損傷現(xiàn)象與在地震作用下的損傷機(jī)理作了較全面的介紹,討論了目前階段混凝土材料損傷的研究現(xiàn)狀,并歸納了四種比較實(shí)用的損傷模型。(2)對動力損傷理論作出了詳細(xì)的闡述：損傷力學(xué)中比較重要的概念損傷變量,動力損傷本構(gòu)模型的理論基礎(chǔ)、動力損傷本構(gòu)關(guān)系、損傷阻尼矩陣等。(3)通過MIDAS CIVIL2012建立了某連續(xù)剛構(gòu)橋的動力特性計(jì)算模型,對其做了動力特性分析,得到了某連續(xù)剛構(gòu)橋前20階的周期、頻率與振型,為后續(xù)的彈塑性動力時程分析提供了數(shù)據(jù)支持。(4)通過MIDAS CIVIL2012建立了某連續(xù)剛構(gòu)橋的彈塑性動力時程分析計(jì)算模型,計(jì)算了其在峰值加速度為0.5g的地震波作用下的位移、內(nèi)力響應(yīng)。通過彈塑性時程分析得到了橋墩在縱向地震波加載時彈性階段和塑性階段的內(nèi)力、位移響應(yīng),橫向地震波加載時彈性和塑料階段的內(nèi)力、位移響應(yīng)。確定了橋梁最先進(jìn)入塑性階段的位置、時間、地震波加速度峰值以及最先發(fā)生破壞的位置、時間、地震波加速度峰值,彈塑性時程分析目的是為了與后面的損傷分析下結(jié)構(gòu)內(nèi)力、位移響應(yīng)做數(shù)據(jù)對比。(5)對peer數(shù)據(jù)庫中實(shí)驗(yàn)數(shù)據(jù)的分析整理,提出了混凝土材料彈性和塑性階段的損傷參數(shù)公式,在此基礎(chǔ)上通過ABAQUS6.12建立了橋墩的有限元模型,通過調(diào)用子程序UMAT對8#墩做損傷分析,得到損傷分析下8#墩的內(nèi)力、位移響應(yīng)。通過地震作用下彈塑性時程分析與損傷分析結(jié)果的比較,發(fā)現(xiàn)兩種分析方法得到的位移、內(nèi)力結(jié)果差值均在10%以內(nèi),驗(yàn)證了損傷參數(shù)公式的合理性。說明地震作用下該損傷參數(shù)公式可以為以后鋼筋混凝土橋墩的損傷計(jì)算提供參考。
[Abstract]:Due to the frequent occurrence of earthquakes in recent years, it has made us more aware of the mechanical properties of structures under the earthquake, especially the bridge structure as a lifeline engineering. The damage condition of the bridge structure under the earthquake action is directly related to the opening of the earthquake relief channel after the earthquake, the transportation of materials for earthquake relief, and the bridge junction. The damage to the life and property of the people will be greatly lost. Therefore, it is necessary to analyze the damage of the bridges which are mainly concrete. After describing the basic theory and the damage theory of the seismic response analysis, this paper takes a multi span continuous rigid frame bridge as the engineering background and carries out its elastoplastic behavior. The main contents are as follows: (1) the seismic analysis method and the current situation of seismic analysis of continuous rigid frame bridge are discussed. The damage phenomenon of concrete material and the damage mechanism under the earthquake action are introduced, and the research status of the damage of concrete material at the present stage is discussed, and four is summarized. A more practical damage model. (2) the dynamic damage theory is described in detail: the most important conceptual damage variables in the damage mechanics, the theoretical foundation of the dynamic damage constitutive model, the dynamic damage constitutive relation, the damage damping matrix, etc. (3) the dynamic characteristic calculation model of a continuous rigid frame bridge is established by MIDAS. In this paper, the dynamic characteristics of a continuous rigid frame bridge are analyzed. The 20 steps of a continuous rigid frame bridge, frequency and mode are obtained, which provide data support for the subsequent elastoplastic dynamic time history analysis. (4) the elastic plastic dynamic time history analysis model of a continuous rigid frame bridge is established by MIDAS CIVIL2012, and its seismic wave at the peak acceleration of 0.5g is calculated. By the elastoplastic time history analysis, the internal force, displacement response, internal force and displacement response in the elastic and plastic stages of the bridge pier are obtained by elastoplastic time history analysis. The position, time and peak acceleration of seismic wave acceleration in the most advanced stage of the bridge are determined. And the first occurrence of damage position, time, seismic wave acceleration peak, elastoplastic time history analysis is designed to compare with the structural internal force and displacement response under the damage analysis. (5) analysis and arrangement of experimental data in the peer database, and put forward the damage parameter formula of the elastic and plastic stage of the concrete material, on the basis of this The finite element model of the pier is established by ABAQUS6.12, and the damage analysis of the 8# piers is analyzed by calling the subroutine UMAT, and the internal force and displacement response of the 8# pier under the damage analysis are obtained. By comparing the elastoplastic time history analysis and the damage analysis results under the earthquake action, the displacement of the two analytical methods and the difference of the internal force results are found to be within 10%. The rationality of the formula of damage parameters is proved, which shows that the formula of damage parameters can provide reference for damage calculation of reinforced concrete piers in the future.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U442.55;U448.23

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李慶斌，張楚漢，，王光綸;單軸狀態(tài)下混凝土的動力損傷本構(gòu)模型[J];水利學(xué)報(bào);1994年12期

本文編號：2006019