本文選題：層狀結(jié)構(gòu)　切入點(diǎn)：層底應(yīng)變　出處：《長(zhǎng)安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：路面是典型的層狀結(jié)構(gòu)物，各層厚度和強(qiáng)度的調(diào)整可以影響到路面的使用性能和壽命長(zhǎng)短，長(zhǎng)壽命路面設(shè)計(jì)的控制指標(biāo)之一是面層底部拉應(yīng)變，而且各國(guó)都在嘗試以層底拉應(yīng)變作為控制指標(biāo)設(shè)計(jì)路面。因此，對(duì)結(jié)構(gòu)層底拉應(yīng)變的影響因素進(jìn)行研究具有很好的現(xiàn)實(shí)意義，可以為層狀結(jié)構(gòu)設(shè)計(jì)尤其是道路設(shè)計(jì)提供參考。 道路現(xiàn)場(chǎng)原型試驗(yàn)有很多難題，比如試驗(yàn)耗時(shí)、耗資大，試驗(yàn)干擾因素多，對(duì)尚未建造的工程無(wú)法進(jìn)行試驗(yàn)，試驗(yàn)結(jié)果不利于推廣等等。因此，，本論文用模型試驗(yàn)的方法分析層狀結(jié)構(gòu)物各層厚度、模量以及荷載、層間接觸狀態(tài)對(duì)層底拉應(yīng)變的影響情況，明確各因素改變時(shí)層狀結(jié)構(gòu)物各層底應(yīng)變變化規(guī)律。試驗(yàn)中用貼于各層底面的電阻應(yīng)變計(jì)作為應(yīng)變傳感器，用數(shù)據(jù)信息采集儀DT85G采集不同層狀結(jié)構(gòu)試件的各層層底拉應(yīng)變。本論文同時(shí)用ANSYS有限元法對(duì)層狀結(jié)構(gòu)層底拉應(yīng)變進(jìn)行數(shù)值模擬計(jì)算，將有限元法計(jì)算結(jié)果與試驗(yàn)法的檢測(cè)結(jié)果進(jìn)行比較。 得出的主要結(jié)論有：各層底部縱向應(yīng)變都大于橫向應(yīng)變；要減小各層底應(yīng)變，單純通過(guò)改變面層模量的方法難以達(dá)到預(yù)想的效果，適當(dāng)提高面層模量的基礎(chǔ)上增大面層厚度可以獲得很好的效果；連續(xù)接觸狀態(tài)下的各層底應(yīng)變都小于光滑接觸狀態(tài)下的應(yīng)變；動(dòng)載時(shí)層間接觸狀態(tài)差異對(duì)各層底的應(yīng)變影響較靜載時(shí)更大；加強(qiáng)層間處置技術(shù)，改善層間接觸條件可以顯著地減小各層底部拉應(yīng)變。ANSYS有限元計(jì)算結(jié)果與試驗(yàn)結(jié)果基本吻合，可借助有限元建模分析計(jì)算進(jìn)一步確定的模量和厚度對(duì)結(jié)構(gòu)層底應(yīng)變的影響規(guī)律。
[Abstract]:Pavement is a typical layered structure. The adjustment of the thickness and strength of each layer can affect the performance and life of the pavement. One of the control indexes in the design of long life pavement is the tensile strain at the bottom of the pavement. Therefore, it is of great practical significance to study the influencing factors of the tensile strain on the bottom of the structure, which can provide a reference for the design of layered structure, especially for the road design. There are many difficult problems in road field prototype test, such as time consuming, high cost, many interference factors, the unbuilt project can not be tested, the test result is not good for popularization and so on. In this paper, the influence of layer thickness, modulus and load, interlayer contact state on the tensile strain of layered structure is analyzed by model test. The strain change law of each layer bottom of layered structure is determined when the factors change. The resistance strain gauge attached to the bottom of each layer is used as strain sensor in the test. In this paper, the tensile strain of different layered structures is collected by DT85G, and the tensile strain of layered structure is numerically simulated by ANSYS finite element method. The result of finite element method is compared with that of test method. The main conclusions are as follows: the longitudinal strain at the bottom of each layer is greater than the transverse strain, and to reduce the strain at the bottom of each layer, it is difficult to achieve the desired effect simply by changing the modulus of the surface layer. Increasing the thickness of the surface layer on the basis of properly increasing the modulus of the surface layer can obtain good results, and the bottom strain of each layer in the continuous contact state is smaller than the strain in the smooth contact state. The difference of contact state between layers during dynamic load has a greater effect on the strain of each layer bottom than that under static load, and the finite element calculation results of the finite element method can significantly reduce the tensile strain at the bottom of each layer by strengthening the interlayer disposal technology and improving the contact condition between the layers. The results of finite element analysis are in good agreement with the experimental results. The influence of modulus and thickness on the bottom strain of structure can be calculated by means of finite element modeling.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.03

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