本文選題：CFRP鋼管約束混凝土　切入點(diǎn)：荷載-軸向位移曲線　出處：《大連海事大學(xué)》2017年碩士論文

【摘要】：CFRP鋼管混凝土結(jié)構(gòu)衍生于鋼管混凝土的結(jié)構(gòu),指用碳纖維布纏繞黏貼于鋼管混凝土外側(cè),形成以核心混凝土、鋼管和CFRP為基礎(chǔ)材料的組合結(jié)構(gòu),與傳統(tǒng)鋼管混凝土相比,由于CFRP的約束作用使結(jié)構(gòu)具有更高的承載能力。綜合鋼管混凝土和CFRP的優(yōu)點(diǎn),此復(fù)合構(gòu)件具有強(qiáng)度高、延性好、自重輕和抗銹蝕等優(yōu)點(diǎn)。同時(shí)CFRP鋼管約束混凝土良好的施工性能注定其在未來的工程應(yīng)用上有著更廣闊的前景。不同受荷載形式的結(jié)構(gòu)力學(xué)影響差別巨大,就CFRP鋼管混凝土柱體結(jié)構(gòu)而言荷載多為兩種形式,即(A式)軸壓力由鋼管和核心混凝土共同承擔(dān)或(B式)僅作用于核心混凝土,關(guān)于前者的研究較多,本文重點(diǎn)討論軸壓荷載僅作用于核心混凝土(B式)的情況,因CFRP和鋼管僅起到約束作用稱之為"CFRP鋼管約束混凝土"。在現(xiàn)有研究工作基礎(chǔ)上本文分別以試驗(yàn)測試、理論分析和有限元數(shù)值模擬方法對CFRP鋼管約束混凝土短柱的軸壓力學(xué)性能進(jìn)行深入研究。本文的主要研究內(nèi)容如下:(1)本文做了 6組CFRP鋼管約束混凝土短柱的B式軸壓試驗(yàn)和2組A、B式軸壓對比試驗(yàn),每組3根試件,纏繞CFRP的層數(shù)分別為0、1、2層。觀察24根試件并分析其破壞模態(tài)的異同,由短柱的材料參數(shù)、應(yīng)變分析和荷載-軸向位移曲線分析了構(gòu)件的破壞過程,研究了3種材料對軸向承載力提高系數(shù)和延性系數(shù)的影響。同時(shí),通過A、B式對比試驗(yàn)分析了 B式加載方式的優(yōu)勢。(2)通過分析試驗(yàn)現(xiàn)象和破壞形態(tài)可知CFRP改善了核心混凝土中內(nèi)力分布過程中的不穩(wěn)定性,提高了試件的抗壓能力和整體剛度。通過柱狀圖分析混凝土、鋼管厚度和CFRP厚度對試件極限承載力的影響。以試驗(yàn)數(shù)據(jù)為基礎(chǔ),分別繪制CFRP鋼管約束混凝土短柱在B式軸壓加載方式下的承載力提高系數(shù)SI與徑厚比D/t,鋼管約束效應(yīng)系數(shù)ls和CFRP約束效應(yīng)系數(shù)lf的關(guān)系曲線和延性系數(shù)DI與ls和lf的關(guān)系曲線。分析曲線結(jié)果表明該結(jié)構(gòu)承載力的提高主要取決于lf,而構(gòu)件的延性同時(shí)受鋼管和CFRP的雙重影響。(3)通過對實(shí)驗(yàn)數(shù)據(jù)的線性歸回和多元?dú)w回,得到構(gòu)件承載力提高系數(shù)與套箍系數(shù)的關(guān)系模型,并通過模擬得出CFRP鋼管約束混凝土短柱在不同混凝土強(qiáng)度條件下承載力的計(jì)算表達(dá)式;基于CFRP、鋼管和核心混凝土在極限承載力時(shí)應(yīng)力狀態(tài)的合理假設(shè),通過極限平衡法,推導(dǎo)出CFRP鋼管約束混凝土短柱的B式軸壓加載方式的極限承載力表達(dá)式。(4)為了彌補(bǔ)試驗(yàn)構(gòu)件數(shù)量的不足,本文利用有限元軟件ABAQUS對所有試驗(yàn)構(gòu)件進(jìn)行了模擬,分別對試件在受力過程中截面應(yīng)力云圖、環(huán)向位移、整體應(yīng)力云圖、材料參數(shù)和荷載-軸向位移曲線進(jìn)行分析。
[Abstract]:The concrete filled steel tube (CFRP) structure is derived from the concrete filled steel tube (CFST) structure, which is wrapped in carbon fiber sheet and adhered to the outer side of CFST to form a composite structure based on core concrete, steel tube and CFRP, which is compared with the traditional CFST. Because of the constraint of CFRP, the structure has higher bearing capacity. Combined with the advantages of concrete filled steel tube and CFRP, the composite member has high strength and good ductility. At the same time, the good construction performance of CFRP steel tube confined concrete is bound to have a broader prospect in the future engineering application. As far as CFRP concrete filled steel tubular column structure is concerned, there are two kinds of loads, namely, A type) axial pressure is shared by steel tube and core concrete or B type only acts on the core concrete, and there are more researches on the former. This paper focuses on the case that the axial compression load acts only on the core concrete (form B), because the CFRP and the steel pipe only play a binding role, which is called "CFRP steel tube confined concrete". Based on the existing research work, this paper respectively uses the test test. Theoretical analysis and finite element numerical simulation method are used to study the axial compressive mechanical properties of CFRP steel tube confined concrete short columns. The main contents of this paper are as follows: 1) in this paper, six groups of CFRP steel tube confined concrete short columns are made. Type axial compression test and two groups of Agna B axial compression contrast test, In each group of 3 specimens, the number of layers winding CFRP is 0 / 1 / 2 respectively. Observing 24 specimens and analyzing the similarities and differences of their failure modes, the failure process of the member is analyzed by the material parameters, strain analysis and load-axial displacement curve of the short column. The influence of three kinds of materials on axial bearing capacity increasing coefficient and ductility coefficient is studied. The advantage of B type loading mode is analyzed by means of comparative test. (2) by analyzing the test phenomenon and failure form, we can see that CFRP can improve the instability in the process of internal force distribution in the core concrete. The influence of concrete, steel tube thickness and CFRP thickness on the ultimate bearing capacity of the specimen was analyzed by histogram. The relationship curves, ductility coefficient DI and ls and ductility coefficient of CFRP steel tube confined concrete short columns under B type axial compression loading were plotted respectively, and the relationship curves of the coefficient of constraint effect between steel tube and CFRP constraint coefficient L _ f and the coefficient of ductility coefficient DI and ls were drawn respectively. The results of the analysis show that the increase of the bearing capacity of the structure mainly depends on the LF, and the ductility of the members is affected by the double influence of steel pipe and CFRP. 3) through the linear regression and the multivariate regression of the experimental data, The model of the relationship between the increasing coefficient of bearing capacity and the coefficient of hoop is obtained, and the calculation expression of bearing capacity of CFRP steel tube confined concrete short column under different concrete strength is obtained by simulation. Based on the reasonable assumption of the stress state of steel tube and core concrete under the ultimate bearing capacity of CFRP, the ultimate equilibrium method is adopted. In order to make up for the shortage of test members, the finite element software ABAQUS is used to simulate all the test members. The stress cloud diagram of section, circumferential displacement, integral stress cloud diagram, material parameters and load-axial displacement curve were analyzed respectively.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU398.9

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