本文選題：混凝土動(dòng)態(tài)性能 + 荷載歷史��； 參考：《河北工業(yè)大學(xué)》2014年博士論文

【摘要】：混凝土材料在現(xiàn)代建筑材料的使用中占據(jù)著越來(lái)越重要的地位，成為用途最廣的建筑材料之一，其應(yīng)用的領(lǐng)域非常廣泛，如：房屋建筑工程、道路與橋梁工程、河堤大壩工程等。混凝土作為復(fù)合型材料，實(shí)際工作中，往往是在歷經(jīng)荷載歷史的基礎(chǔ)上再受到動(dòng)載的作用，其力學(xué)特性會(huì)受到荷載歷史的影響。相對(duì)于混凝土的靜態(tài)力學(xué)性能而言，混凝土的動(dòng)態(tài)力學(xué)性能更為復(fù)雜，在工作過(guò)程中混凝土要受到地震、風(fēng)荷載、爆炸荷載等荷載作用，故混凝土的動(dòng)態(tài)力學(xué)性能對(duì)結(jié)構(gòu)的安全性和穩(wěn)定性起關(guān)鍵性作用。 由于試驗(yàn)裝置系統(tǒng)與試驗(yàn)方法的選擇都會(huì)對(duì)試驗(yàn)結(jié)果產(chǎn)生很大的影響，本文結(jié)合試驗(yàn)設(shè)計(jì)與方案利用MTS加載裝置和先進(jìn)的數(shù)據(jù)采集儀，采用適當(dāng)?shù)脑嚰谱鞣椒ê图虞d工藝對(duì)不同強(qiáng)度等級(jí)的混凝土試件進(jìn)行了動(dòng)態(tài)荷載作用下的彎拉試驗(yàn)。 本文對(duì)C35、C40、C45三種強(qiáng)度等級(jí)的混凝土試件進(jìn)行動(dòng)載作用下的力學(xué)特性分析，分別在應(yīng)變速率為10-6s-1、10-5s-1、10-4s-1下進(jìn)行動(dòng)態(tài)直接破壞、歷經(jīng)荷載歷史以及分級(jí)加載持荷三種不同受力情況的動(dòng)態(tài)彎拉破壞。通過(guò)試驗(yàn)數(shù)據(jù)的總結(jié)分析，研究了荷載歷史、分級(jí)加載持荷與應(yīng)變速率對(duì)混凝土試件的抗彎拉彈性模量、泊松比、抗彎拉峰值應(yīng)變、抗彎拉強(qiáng)度以及彎拉應(yīng)力應(yīng)變曲線的影響，最后對(duì)混凝土試件的破壞機(jī)理進(jìn)行了分析。 基于損傷原理，本文考慮了動(dòng)態(tài)應(yīng)變率強(qiáng)化效應(yīng)與損傷的弱化效應(yīng)后構(gòu)建了混凝土的動(dòng)態(tài)抗壓本構(gòu)模型與動(dòng)態(tài)抗拉本構(gòu)模型，利用ANSYS和FORTRAN編程有限元方法得到混凝土試件的動(dòng)彎拉應(yīng)力應(yīng)變曲線，，該結(jié)果與試驗(yàn)得到的結(jié)果基本吻合，進(jìn)而證明了本章中提出的本構(gòu)模型具有一定的參考價(jià)值。
[Abstract]:Concrete material plays an increasingly important role in the use of modern building materials and has become one of the most widely used building materials. It is widely used in many fields, such as: building engineering, road and bridge engineering, etc. A river embankment, a dam, etc. Concrete, as a composite material, is usually subjected to dynamic load on the basis of the history of load, and its mechanical properties will be affected by the history of load. Compared with the static mechanical properties of concrete, the dynamic mechanical properties of concrete are more complex. In the process of work, concrete is subjected to earthquake, wind load, explosion load and other loads. Therefore, the dynamic mechanical properties of concrete play a key role in the safety and stability of the structure. Because the choice of test equipment system and test method will have a great influence on the test results, this paper combines the test design and scheme to use MTS loading device and advanced data acquisition instrument. The flexural tensile tests of concrete specimens with different strength grades were carried out under dynamic load with proper specimen making method and loading technology. In this paper, the mechanical properties of concrete specimens with three strength grades C35- C40C45 are analyzed under dynamic loading, and dynamic direct failure is carried out at strain rate of 10-6s-1 / 10-5s-1 / 10-4s-1, respectively. Dynamic flexural failure under three different loading conditions: the history of experienced load and the load holding capacity of step loading. Through the summary and analysis of test data, the effects of load history, load holding capacity and strain rate on flexural tensile elastic modulus, Poisson's ratio, peak strain, flexural tensile strength and stress-strain curve of concrete specimens are studied. Finally, the failure mechanism of concrete specimen is analyzed. Based on the damage principle, the dynamic compressive constitutive model and the dynamic tensile constitutive model of concrete are constructed by considering the dynamic strain rate strengthening effect and the damage weakening effect. The dynamic bending stress-strain curves of concrete specimens are obtained by using ANSYS and FORTRAN programming finite element method. The results are in good agreement with the experimental results, which proves that the constitutive model proposed in this chapter has certain reference value.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU528

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