SHCC管的試驗(yàn)研究與結(jié)構(gòu)分析
發(fā)布時(shí)間：2018-07-24 10:03
【摘要】：聚乙烯醇(PVA)—應(yīng)變硬化水泥基復(fù)合材料(簡稱SHCC)是目前發(fā)展迅速的一種超高延性纖維增強(qiáng)水泥基復(fù)合材料,通過在特制水泥砂漿中摻入一定量的PVA纖維制成,在承受拉伸荷載時(shí),表現(xiàn)出多縫穩(wěn)定開裂和應(yīng)變硬化特征,從而在許多發(fā)達(dá)國家的不同領(lǐng)域已經(jīng)得到了工程應(yīng)用,但卻鮮有SHCC管道方面的研究。本課題在國家863計(jì)劃——《多基結(jié)構(gòu)材料復(fù)合技術(shù)及在高壓管制造中的應(yīng)用》(2013AA031306)項(xiàng)目資助下開展SHCC管道的相關(guān)研究。本文通過實(shí)驗(yàn)手段研究SHCC管道在平壓荷載作用下的應(yīng)變、位移以及裂紋的變化;再通過理論計(jì)算SHCC管道的極限承載力及其影響因素,并對SHCC管剛度進(jìn)行探討。主要工作如下:(1)開展了SHCC單軸拉伸實(shí)驗(yàn)和三支承下的SHCC管平壓試驗(yàn),研究表明,SHCC材料與管環(huán)的失效過程大致分為:彈性階段、開裂階段、強(qiáng)化階段和破壞階段等,在SHCC管底、管腰和管頂?shù)扔^察到多條細(xì)裂紋,與內(nèi)徑相同的普通混凝土管相比,SHCC具有厚度更薄以及承載力更高的優(yōu)勢;(2)建立了SHCC管道平壓狀態(tài)下的力學(xué)分析模型,分別以最大壓應(yīng)變和最大彎矩為控制參量計(jì)算得出SHCC管的極限承載力,并與測試結(jié)果進(jìn)行了比較,討論了結(jié)構(gòu)幾何尺寸以及材料力學(xué)參數(shù)對結(jié)果的影響,研究表明以最大壓應(yīng)變?yōu)榭刂茀?shù)計(jì)算極限承載力能較準(zhǔn)確的得到SHCC管的極限承載力,此方法中SHCC受壓時(shí)的極限彈性應(yīng)變對結(jié)果影響最大;以最大截面彎矩為控制參數(shù)計(jì)算極限承載力時(shí)能較準(zhǔn)確的反映出SHCC管平壓試驗(yàn)的過程,此方法中SHCC的極限拉伸強(qiáng)度對結(jié)果影響最大;(3)基于國內(nèi)外結(jié)構(gòu)管剛?cè)嵝缘南嚓P(guān)理論分析了SHCC管剛度,結(jié)果表明:SHCC管在進(jìn)入開裂階段后直至最終破壞,其剛度隨著管頂荷載的增加,明顯下降;本文圍繞SHCC管研究展開,對發(fā)展新型抗裂混凝土管道將起到推動作用。
[Abstract]:Polyvinyl alcohol (PVA) strain hardening cement matrix composite (SHCC) is a kind of super ductile fiber reinforced cement matrix composite which is developed rapidly at present. It is made by adding a certain amount of PVA fiber into special cement mortar. When subjected to tensile load, it shows the characteristics of multi-joint stable cracking and strain hardening, so it has been applied in many developed countries in different fields, but there is little research on SHCC pipeline. This project is funded by the National 863 Program-"Multi-base structural material Composite Technology and its Application in High pressure Pipe Manufacturing" (2013AA031306) project to carry out research on SHCC pipeline. In this paper, the strain, displacement and crack of SHCC pipeline under the action of flat compression are studied by experimental means, and the ultimate bearing capacity of SHCC pipeline and its influencing factors are calculated theoretically, and the stiffness of SHCC pipe is discussed. The main works are as follows: (1) the uniaxial tensile test of SHCC and the test of SHCC tube under three supports have been carried out. The results show that the failure process of SHCC material and ring can be divided into three stages: elastic stage, cracking stage, strengthening stage and failure stage, etc., at the bottom of the SHCC tube, Many fine cracks have been observed in the tube waist and top of the pipe. Compared with the common concrete pipe with the same inner diameter, SHCC has the advantages of thinner thickness and higher bearing capacity. (2) the mechanical analysis model of SHCC pipeline under the condition of flat pressure is established. The ultimate bearing capacity of SHCC pipe was calculated by using the maximum compressive strain and the maximum bending moment as control parameters, and compared with the test results. The effects of structural geometry and mechanical parameters of materials on the results were discussed. The results show that the ultimate bearing capacity of SHCC tube can be calculated accurately by using the maximum compressive strain as the control parameter. In this method, the ultimate elastic strain of SHCC under compression has the greatest influence on the results. When the ultimate bearing capacity is calculated with the maximum bending moment as the control parameter, it can accurately reflect the process of the SHCC pipe flat pressure test. In this method, the ultimate tensile strength of SHCC has the greatest influence on the results. (3) the stiffness of SHCC tubes is analyzed based on the theory of structural flexibility at home and abroad. The stiffness of the pipe decreases obviously with the increase of the load on the top of the pipe, and the research on the SHCC pipe is carried out in this paper, which will promote the development of the new crack resistant concrete pipeline.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB332
[Abstract]:Polyvinyl alcohol (PVA) strain hardening cement matrix composite (SHCC) is a kind of super ductile fiber reinforced cement matrix composite which is developed rapidly at present. It is made by adding a certain amount of PVA fiber into special cement mortar. When subjected to tensile load, it shows the characteristics of multi-joint stable cracking and strain hardening, so it has been applied in many developed countries in different fields, but there is little research on SHCC pipeline. This project is funded by the National 863 Program-"Multi-base structural material Composite Technology and its Application in High pressure Pipe Manufacturing" (2013AA031306) project to carry out research on SHCC pipeline. In this paper, the strain, displacement and crack of SHCC pipeline under the action of flat compression are studied by experimental means, and the ultimate bearing capacity of SHCC pipeline and its influencing factors are calculated theoretically, and the stiffness of SHCC pipe is discussed. The main works are as follows: (1) the uniaxial tensile test of SHCC and the test of SHCC tube under three supports have been carried out. The results show that the failure process of SHCC material and ring can be divided into three stages: elastic stage, cracking stage, strengthening stage and failure stage, etc., at the bottom of the SHCC tube, Many fine cracks have been observed in the tube waist and top of the pipe. Compared with the common concrete pipe with the same inner diameter, SHCC has the advantages of thinner thickness and higher bearing capacity. (2) the mechanical analysis model of SHCC pipeline under the condition of flat pressure is established. The ultimate bearing capacity of SHCC pipe was calculated by using the maximum compressive strain and the maximum bending moment as control parameters, and compared with the test results. The effects of structural geometry and mechanical parameters of materials on the results were discussed. The results show that the ultimate bearing capacity of SHCC tube can be calculated accurately by using the maximum compressive strain as the control parameter. In this method, the ultimate elastic strain of SHCC under compression has the greatest influence on the results. When the ultimate bearing capacity is calculated with the maximum bending moment as the control parameter, it can accurately reflect the process of the SHCC pipe flat pressure test. In this method, the ultimate tensile strength of SHCC has the greatest influence on the results. (3) the stiffness of SHCC tubes is analyzed based on the theory of structural flexibility at home and abroad. The stiffness of the pipe decreases obviously with the increase of the load on the top of the pipe, and the research on the SHCC pipe is carried out in this paper, which will promote the development of the new crack resistant concrete pipeline.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB332
【參考文獻(xiàn)】
相關(guān)期刊論文 前5條
1 侯利軍;張秀芳;徐世p，
本文編號：2141021
本文鏈接：http://sikaile.net/kejilunwen/cailiaohuaxuelunwen/2141021.html
最近更新
教材專著
