本文關(guān)鍵詞：FRP-鋼管混凝土復(fù)合柱軸壓承載力計(jì)算方法及軸壓性能研究　出處：《北方工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： FRP-鋼管混凝土復(fù)合柱 極限承載力 軸壓性能 參數(shù)分析 四階段簡(jiǎn)化模型

【摘要】：FRP-鋼管混凝土復(fù)合柱是在鋼管混凝土柱外表面黏貼FRP(復(fù)合纖維塑料)布而形成的新型復(fù)合結(jié)構(gòu)。FRP-鋼管混凝土復(fù)合柱充分利用了鋼管及外包的FRP布對(duì)其內(nèi)部核心混凝土的約束作用從而具備了較高的承載力,因此可作為重載柱應(yīng)用在高層、超高層、大跨度橋梁結(jié)構(gòu)中。此外,由于具備強(qiáng)質(zhì)比高、耐腐蝕、耐久、施工工藝簡(jiǎn)單等特點(diǎn),FRP還可作為加固材料黏貼在已有受損的鋼管混凝土柱表面,從而延長(zhǎng)鋼管混凝土結(jié)構(gòu)的使用壽命。本文深入研究并探討了兩種截面形狀的復(fù)合短柱的軸壓極限承載力計(jì)算方法及軸壓性能,具體采用的研究手段及完成的工作包括:(1)結(jié)合已有的試驗(yàn)現(xiàn)象與分析,采用一系列合理的假設(shè),推導(dǎo)了以側(cè)壓力為基本參量的FRP-圓鋼管混凝土復(fù)合短柱和FRP-方鋼管混凝土復(fù)合短柱的軸壓極限承載力統(tǒng)一計(jì)算式,該統(tǒng)一計(jì)算式程序簡(jiǎn)潔、物理意義明確,比現(xiàn)有其他計(jì)算式適用性更強(qiáng)。通過將統(tǒng)一式計(jì)算結(jié)果與各文獻(xiàn)共計(jì)61組試驗(yàn)數(shù)據(jù)的對(duì)比可知,本文的統(tǒng)一計(jì)算式計(jì)算結(jié)果與試驗(yàn)值吻合較好,可為復(fù)合柱設(shè)計(jì)和理論分析提供可靠依據(jù)。(2)在ABAQUS軟件中,建立了 FRP-圓鋼管混凝土復(fù)合短柱和FRP-方鋼管混凝土復(fù)合短柱的軸壓有限元計(jì)算模型,對(duì)比了模型與相關(guān)獻(xiàn)中對(duì)應(yīng)試件的極限承載力、軸壓全過程荷載-位移曲線及破壞模式,結(jié)果表明:文中建立的模型可以模擬出與試驗(yàn)相符的鋼管鼓屈變形及FRP的斷裂分布情況,同時(shí)模型軸壓全過程荷載-位移曲線及極限承載力與18組試驗(yàn)結(jié)果吻合良好,從而說明本文提出的建模方法可用于評(píng)估和分析FRP-鋼管混凝土復(fù)合短柱的軸壓性能。(3)采用上述建模方法,建立了 78組不同參數(shù)的復(fù)合柱試件,系統(tǒng)地研究了 FRP層數(shù)、FRP種類、混凝土強(qiáng)度、鋼管屈服強(qiáng)度以及鋼管厚度對(duì)復(fù)合柱軸壓性能的影響;其次,選擇典型圓柱和方柱試件進(jìn)行軸壓全過程中各組成部分的應(yīng)力變化規(guī)律分析,進(jìn)一步掌握了兩種復(fù)合柱軸壓性能機(jī)理與性能;最后,結(jié)合有限元分析及已有的試驗(yàn)成果,提出了軸壓圓柱和方柱受力全過程的荷載-位移曲線四階段簡(jiǎn)化模型,并闡述了各階段復(fù)合柱的受力機(jī)理,可為今后進(jìn)一步對(duì)復(fù)合柱結(jié)構(gòu)進(jìn)行彈塑性分析提供參考。
[Abstract]:Concrete composite column is FRP- steel in steel pipe concrete column outer surface adhesive FRP (fiber composite plastic cloth) and the formation of new concrete composite structure of.FRP- steel tube composite column to make full use of the constraint effect of steel and outsourcing FRP cloth of the inner core concrete which has high bearing capacity, so it can be used in the application of heavy load column the high-rise, high-rise, long-span bridge structure. In addition, due to strong corrosion resistance, high quality, durability, features simple construction process, FRP can also be used as reinforcement material in concrete filled steel tubular column adhesive surface has been damaged, thereby prolonging the service life of concrete filled steel tubular structure. This paper deeply studies and discusses the composite short column two axis section pressure ultimate bearing capacity calculation method and axial compression performance, and by means of specific research work include: (1) combined with the existing experimental phenomena and points By analysis, a series of reasonable assumptions, derived by side pressure as the basic parameters of FRP- steel tube concrete composite columns and FRP- square steel tube composite column under axial compressive ultimate bearing capacity of the unified formula, the unified formula of simple procedures, clear physical meaning, more than other existing formulas by apply. The comparison between the calculation results and the unification of literature and a total of 61 sets of experimental data, this paper unified the result of calculation are in good agreement with the experimental value, which can provide a reliable basis for the design of composite column and theoretical analysis. (2) in ABAQUS software, established the FRP- steel tube concrete composite column and FRP- steel composite columns finite element model, comparative model and related literature corresponding to the ultimate bearing capacity of specimen, the whole process of axial load displacement curves and failure modes, the results show that the model established in this paper Type can be simulated and the steel drum bend distortion and FRP fracture test line distribution, bearing capacity and axial compression model of the whole process of load displacement curves and the ultimate and 18 groups of test results are in good agreement, which shows that the modeling method proposed in this paper can be used for the evaluation and analysis of FRP- steel tube concrete composite column under axial compression performance. (3) based on the above modeling method, the composite column specimens to establish 78 groups of different parameters of the system in the FRP layer, FRP type, concrete strength, steel yield strength and the influence of the thickness of steel pressure on the performance of composite columns; secondly, select the typical circular and square column specimens subjected to axial loading process the analysis of stress variation of parts, and further understand the two kinds of composite columns under axial pressure and the mechanism of performance performance; finally, combined with the test results of finite element analysis and the proposed axial circular and square columns full The four stage simplified model of load displacement curve of the process is presented, and the stress mechanism of the composite columns at different stages is expounded, which can provide references for further analysis of the composite column structure elastic-plastic.

【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU398.9

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本文編號(hào)：1401468