【摘要】：粘結(jié)是鋼筋和混凝土之間一種復(fù)雜的相互作用,通過(guò)粘結(jié)傳遞兩者之間的應(yīng)力、協(xié)調(diào)變形,足夠的粘結(jié)是鋼筋混凝土構(gòu)件發(fā)揮良好工作性能的基礎(chǔ)。因此,研究鋼筋與混凝土之間錨固粘結(jié),對(duì)于評(píng)估混凝土結(jié)構(gòu)使用性能意義重大。本文通過(guò)梁端式拔出試驗(yàn)研究箍筋間距與保護(hù)層厚度對(duì)粘結(jié)滑移性能的影響,并利用精細(xì)的有限元模型進(jìn)行對(duì)比驗(yàn)證,將得到的粘結(jié)滑移本構(gòu)模型應(yīng)用于混凝土簡(jiǎn)支梁力學(xué)性能分析。本文的主要研究?jī)?nèi)容如下： (1)通過(guò)梁端式拔出試驗(yàn)研究了保護(hù)層厚度及箍筋間距對(duì)極限粘結(jié)強(qiáng)度的影響,并建立反映不同約束狀況的經(jīng)驗(yàn)公式�；谄渌麑W(xué)者研究成果及本文試驗(yàn)數(shù)據(jù),建立了考慮不同保護(hù)層厚度及箍筋間距的粘結(jié)滑移本構(gòu)關(guān)系。 (2)基于本文梁端式拔出試驗(yàn),通過(guò)有限元軟件建立精細(xì)的三維實(shí)體梁端式模型,模擬帶肋鋼筋從混凝土中拔出劈裂破壞的全過(guò)程。從有限元的角度分析保護(hù)層厚度及箍筋間距對(duì)粘結(jié)滑移本構(gòu)關(guān)系的影響,并與本文試驗(yàn)結(jié)果進(jìn)行對(duì)比驗(yàn)證。本文還得到了拔出鋼筋及混凝土在拔出過(guò)程中的各處應(yīng)力分布,彌補(bǔ)了部分試驗(yàn)難以測(cè)得的試驗(yàn)數(shù)據(jù)。 (3)基于本文梁端式拔出試驗(yàn)建立的粘結(jié)滑移本構(gòu)模型,采用有限元程序?qū)Σ煌P蝕率的混凝土簡(jiǎn)支梁梁進(jìn)行有限元分析并與試驗(yàn)對(duì)比,同時(shí)還考察了有無(wú)考慮位置函數(shù)情況下試驗(yàn)梁的力學(xué)性能。在此基礎(chǔ)上,分析了不同銹蝕下錨固長(zhǎng)度、保護(hù)層厚度、受拉縱筋直徑、受拉縱筋數(shù)量等不同參數(shù)下混凝土梁的極限承載與極限撓度變化規(guī)律。
[Abstract]:Bond is a kind of complex interaction between steel bar and concrete. It is the foundation of good working performance of reinforced concrete members to transfer stress and coordinate deformation by bond. Therefore, the study of Anchorage bond between reinforcement and concrete is of great significance to evaluate the performance of concrete structures. In this paper, the effects of stirrups spacing and cover thickness on bond-slip properties are studied by beam end pull-out test, and the fine finite element model is used to compare and verify the effect of stirrups spacing and protective layer thickness on the bond-slip behavior. The bond-slip constitutive model is used to analyze the mechanical properties of simply supported concrete beams. The main contents of this paper are as follows: (1) through beam end pull-out test, the influence of protective layer thickness and stirrups spacing on ultimate bond strength is studied, and empirical formulas reflecting different constraint conditions are established. Based on the research results of other scholars and the experimental data in this paper, a bond-slip constitutive relation considering the thickness of different protective layers and the spacing of stirrups is established. (2) based on the beam end pull-out test in this paper, A fine 3D solid beam end model was established by finite element software to simulate the whole process of pulling ribbed steel bar out of concrete. The influence of the thickness of protective layer and the spacing of stirrups on the bond-slip constitutive relationship is analyzed from the point of view of finite element method and the results are compared with the experimental results in this paper. In this paper, the stress distribution in the pull-out process of steel bar and concrete is also obtained, which makes up for some test data which are difficult to measure. (3) the bond-slip constitutive model based on the beam end pull-out test in this paper. The finite element analysis of simply supported concrete beams with different corrosion rates was carried out by finite element program and compared with the test results. At the same time, the mechanical properties of the test beams with or without the position function were investigated. On this basis, the variation law of ultimate bearing capacity and ultimate deflection of concrete beams under different corrosion conditions, such as anchoring length, thickness of protective layer, diameter of tensile longitudinal tendons and number of tensile longitudinal tendons, are analyzed.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU375

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