發(fā)布時(shí)間：2018-08-20 08:53

【摘要】：在鋼筋砼構(gòu)件(或結(jié)構(gòu))的疲勞研究中,疲勞試驗(yàn)方法一直以來是國內(nèi)外研究疲勞問題的主要手段。隨著有限元軟件的發(fā)展優(yōu)化,數(shù)值模擬方法以其成本小、可重復(fù)性強(qiáng)等優(yōu)點(diǎn)逐漸被研究人員所采用。數(shù)值模擬與試驗(yàn)手段在鋼筋砼疲勞問題的研究中相輔相成,疲勞試驗(yàn)為疲勞數(shù)值模擬提供基礎(chǔ),如鋼筋砼疲勞數(shù)值模擬時(shí)用到的初始材料力學(xué)參數(shù)和疲勞過程中這些參數(shù)的退化模型等都是通過疲勞試驗(yàn)手段得到。但是對(duì)于疲勞試驗(yàn)周期長、成本高,精確的數(shù)值模擬可以彌補(bǔ)疲勞試驗(yàn)的弊端,即以較少次數(shù)的疲勞試驗(yàn)為基礎(chǔ),模擬研究鋼筋砼構(gòu)件(或結(jié)構(gòu))的疲勞性能,乃至整個(gè)疲勞加載過程的模擬。但是在當(dāng)下數(shù)值模擬過程中同樣面臨著很多問題,如鋼筋砼構(gòu)件或(結(jié)構(gòu))在疲勞加載過程中組成材料的力學(xué)參數(shù)退化模型和本構(gòu)關(guān)系不同學(xué)者通過不同的試驗(yàn)得到形式各異煩簡不同的模型,那么如何來合理的選擇進(jìn)行數(shù)值模擬才能使模擬結(jié)果更加精確和更具有適用性和通用性,是當(dāng)下丞待解決的問題。針對(duì)此本文按照遞進(jìn)的順序,從組成材料的疲勞性能到鋼筋砼構(gòu)件的疲勞性能再到鋼筋砼橋梁結(jié)構(gòu)的疲勞性能進(jìn)行研究工作,現(xiàn)將本文主要工作簡述如下:1.在混凝土材料疲勞已有研究成果的基礎(chǔ)上,探討了混凝土在疲勞加載過程中各力學(xué)參數(shù)退化模型和本構(gòu)關(guān)系,對(duì)其適用性進(jìn)行分析。建立以最大應(yīng)力水平予以區(qū)分的混凝土疲勞S-N曲線方程。2.在鋼筋材料疲勞已有研究成果的基礎(chǔ)上,探討了鋼筋在疲勞加載過程中各力學(xué)參數(shù)退化模型和本構(gòu)關(guān)系,對(duì)其適用性進(jìn)行分析。建立鋼筋疲勞剩余強(qiáng)度退化模型。建立通用性較強(qiáng)的鋼筋疲勞S-N曲線方程。3.基于多樣本試驗(yàn)數(shù)據(jù)針對(duì)各疲勞性能參數(shù)退化模型進(jìn)行優(yōu)化組分析建立結(jié)構(gòu)疲勞性能有限元數(shù)值基準(zhǔn)模型(包括靜載基準(zhǔn)模型和疲勞基準(zhǔn)模型)。結(jié)合模型試驗(yàn)和相關(guān)試驗(yàn)資料探討結(jié)構(gòu)構(gòu)件的疲勞性能退化規(guī)律,分別針對(duì)跨中撓度、混凝土應(yīng)變、鋼筋應(yīng)變、剩余極限承載力隨疲勞加載次數(shù)的演變規(guī)律建立預(yù)測(cè)模型,探討了疲勞荷載作用下?lián)隙取?yīng)變、剩余承載力限值,提出更為準(zhǔn)確的預(yù)測(cè)結(jié)構(gòu)剩余使用壽命的方法。4.以基準(zhǔn)模型建立方法為基礎(chǔ),對(duì)京密公路白河橋建立有限元分析模型�；趯�(shí)際重車荷載調(diào)查資料,建立疲勞車模型,考慮鋼筋銹蝕和交通量時(shí)變規(guī)律,研究了超載、鋼筋銹蝕、疲勞共存的情況下橋梁服役年限內(nèi)的疲勞性能,并對(duì)其壽命進(jìn)行了預(yù)測(cè)。
[Abstract]:In the fatigue research of reinforced concrete members (or structures), fatigue test methods have always been the main means to study fatigue problems at home and abroad. With the development and optimization of finite element software, numerical simulation method has been gradually adopted by researchers for its advantages of low cost and strong repeatability. Numerical simulation and test methods complement each other in the study of reinforced concrete fatigue problem. Fatigue test provides the foundation for fatigue numerical simulation. For example, the initial material mechanics parameters used in the fatigue numerical simulation of reinforced concrete and the degenerative model of these parameters in the fatigue process are obtained by means of fatigue test. However, the fatigue test cycle is long, the cost is high, and the accurate numerical simulation can make up for the shortcomings of fatigue test, that is, the fatigue performance of reinforced concrete members (or structures) is simulated and studied on the basis of fewer fatigue tests. And even the simulation of the whole fatigue loading process. But in the current numerical simulation process, there are also many problems, For example, in the process of fatigue loading of reinforced concrete members or structures, the degradation model of mechanical parameters and the constitutive relation of materials are obtained by different scholars through different tests. So how to choose the numerical simulation reasonably to make the simulation results more accurate, more applicable and universal, is the current problem to be solved. In this paper, according to the progressive order, from the fatigue behavior of the composition material to the fatigue behavior of the reinforced concrete member and then to the fatigue performance of the reinforced concrete bridge structure, the main work of this paper is summarized as follows: 1. Based on the existing research results of fatigue of concrete materials, the degradation model and constitutive relation of various mechanical parameters during fatigue loading of concrete are discussed, and the applicability of these models is analyzed. The S-N curve equation of concrete fatigue is established, which is distinguished by the maximum stress level. Based on the existing research results of steel bar fatigue, the degenerative model and constitutive relation of various mechanical parameters during fatigue loading of steel bar are discussed, and the applicability of the model is analyzed. The model of fatigue residual strength degradation is established. The S-N curve equation of steel bar fatigue is established. Based on the multi-sample test data, the finite element numerical reference model (including static load reference model and fatigue reference model) for fatigue performance of structures is established by optimizing group analysis for each fatigue performance parameter degradation model. Combined with the model test and related test data, the fatigue degradation law of structural members is discussed. The prediction model is established for the evolution of mid-span deflection, concrete strain, reinforcement strain and residual ultimate bearing capacity with the fatigue loading times, respectively. The limit values of deflection, strain and residual bearing capacity under fatigue load are discussed, and a more accurate method for predicting the remaining service life of the structure is put forward. Based on the method of establishing the benchmark model, the finite element analysis model of Baihe Bridge of Jingmi Highway is established. Based on the investigation data of actual load, a fatigue vehicle model is established. Considering the rule of corrosion of steel bars and time-varying traffic volume, the fatigue performance of bridges in service life under the condition of overload, corrosion of steel bars and fatigue is studied. The life span is predicted.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441.4

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本文編號(hào)：2193071