本文選題：圓形鋼套管加固鋼筋混凝土 + 受力性能��； 參考：《西南交通大學》2015年博士論文

【摘要】：圓形鋼套管因為具有很強的“套箍”能力,優(yōu)異的力學性能,施工快捷方便,因此受到加固工程領域的廣泛應用。但是在以往的研究中,總是將其與鋼管混凝土混淆,事實上兩者在力學性能上有很大的區(qū)別,而目前針對圓形鋼套管加固鋼筋混凝土柱的相關文獻并不多見,加固設計計算也并不令人滿意,因此本文的研究工作正是基于這一現(xiàn)狀進行的,主要研究內(nèi)容共有以下8個部分：1.通過圓形鋼套管加固鋼筋混凝土短柱軸心受壓破壞試驗,全面研究了加固受壓短柱的工作機理：通過對不同設計參數(shù)(鋼套管厚度、初始應力)的加固試件進行試驗及理論分析,得到各種設計參數(shù)對圓形鋼套管加固鋼筋混凝土柱受力性能以及軸心受壓承載力的影響關系。2.對圓形鋼套管加固鋼筋混凝土短柱的軸心受壓破壞進行有限元數(shù)值模擬,利用數(shù)值模擬方法,深入研究了初始應力對加固短柱承載力的影響,比較了一次受力加固短柱與二次受力加固短柱在承載力以及各部分應力、應變的變化規(guī)律。3.對4種常見的約束混凝土本構(gòu)關系進行闡述,利用有限元數(shù)值模擬方法,將4種本構(gòu)關系計算出來的加固短柱承載力與試驗結(jié)果進行對比,得到最適用于圓形鋼套管加固鋼筋混凝土的應力-應變關系,為之后的設計計算奠定基礎。4.根據(jù)加固短柱受力的工作機理,得到新老混凝土結(jié)合面豎向荷載的傳遞長度以及承載力假定條件,基于圓形鋼套管加固鋼筋混凝土短柱軸心受壓力學性能的試驗,對加固短柱的軸心受壓承載力極限狀態(tài)進行分析,提出了鋼套管“套箍力”與鋼套管縱向應力的修正表達式,得到了考慮加固層剪切變形與軸向變形的加固短柱軸心受壓承載力計算方法；同時考慮加固前柱已受力的現(xiàn)實狀況,提出了臨界應力概念,得到了考慮初始應力的加固短柱軸心受壓承載力計算方法。5.通過圓形鋼套管加固鋼筋混凝土短柱偏心受壓破壞試驗,全面研究了偏心受壓加固短柱的工作機理；通過對不同設計參數(shù)(鋼套管厚度、偏心距)的加固試件進行了試驗以及理論分析,得到各種設計參數(shù)對圓形鋼套管加固偏心受壓短柱的受力性能以及偏心受壓承載力的影響。6.基于圓形鋼套管加固鋼筋混凝土短柱偏心受壓破壞試驗,借鑒鋼管混凝土的計算方法,提出了考慮加固層軸向變形與剪切變形的等效緊箍力的概念,得到一次受力加固短柱偏心受壓承載力,同時考慮到加固前柱已受力的實際狀況,利用疊加法得到考慮初始應力的加固短柱偏心受壓承載力計算公式。7.對圓形鋼套管加固鋼筋混凝土短柱的偏心受壓性能進行非線性有限元分析,并將偏心受壓加固短柱的一次受力計算承載力與試驗承載力進行比較,同時將數(shù)值計算結(jié)果進行擬合,得到偏心受壓加固短柱一次受力的承載力簡化公式；利用上述有限元分析方法,深入研究初始應力對偏心受壓加固短柱承載力的影響,比較了一次受力加固短柱與二次受力加固短柱承載力以及各部分應力、應變的變化規(guī)律。8.通過對圓形鋼套管加固鋼筋混凝土短柱新老混凝土結(jié)合面的研究,得到軸心受壓荷載作用下加固短柱結(jié)合面受力的工作機理、荷載傳遞長度以及新老混凝土結(jié)合面與錨固鋼筋的應力、應變分布規(guī)律；同時推導了考慮混凝土收縮、徐變的新老混凝土結(jié)合面的剪應力,總結(jié)結(jié)合面的抗剪強度計算公式,最后根據(jù)結(jié)合面的破壞形式,得到錨固鋼筋的最小配筋率。
[Abstract]:Because of its strong "hoop" ability, excellent mechanical properties and quick and convenient construction, circular steel casing is widely used in the field of reinforcement engineering. However, in the past research, it is always confused with concrete filled steel tube. In fact, there is a great difference in mechanical properties between the two. At present, the circular steel casing reinforcement steel is used to reinforce the steel. The related literature of reinforced concrete columns is not very common, and the calculation of reinforcement design is not satisfactory. Therefore, the research work of this paper is based on this situation. The main contents of this paper are as follows: (1.) the axial compression failure test of reinforced concrete short columns strengthened by circular steel casing has been studied, and the reinforcement of compressed short columns is fully studied. Working mechanism: through the test and theoretical analysis of the reinforced specimens with different design parameters (steel casing thickness, initial stress), the influence of various design parameters on the mechanical properties of reinforced concrete columns reinforced by circular steel casing and the bearing capacity of the axial compression is obtained. The axial compression of the reinforced concrete short column reinforced with circular steel casing.2. The effect of the initial stress on the bearing capacity of the reinforced short column is deeply studied by the numerical simulation method. The bearing capacity, the stress and the strain of each part of the short column reinforced by a reinforced short column and two times are compared, and the relationship between the 4 common constraint concrete constitutive relations is explained by.3.. By using the finite element numerical simulation method, the bearing capacity of the reinforced short column calculated by the 4 constitutive relations is compared with the test results. The stress strain relation of the reinforced concrete reinforced with the circular steel casing is obtained, and the foundation for the later design and calculation is laid on the basis of the working mechanism of the.4. reinforcement of the short column, and the combination of the new and old concrete is obtained. The transfer length of vertical load and the assumption of bearing capacity are discussed. Based on the test of the pressure behavior of reinforced concrete short column with circular steel casing, the ultimate state of the bearing capacity of the reinforced short column is analyzed. The modified expression of the "hoop force" and the longitudinal stress of the steel casing is put forward. The calculation method of the axial compression bearing capacity of the short column with the shear deformation and the axial deformation is taken into consideration. At the same time, the critical stress concept is taken into consideration, and the calculation method of the axial compression bearing capacity of the short column under the consideration of the initial stress is obtained..5. is strengthened by the circular steel casing to reinforce the eccentric compression of the short column of the reinforced concrete column. The working mechanism of the short column reinforced by eccentric compression is comprehensively studied, and the experimental and theoretical analysis of the reinforced specimens with different design parameters (steel casing thickness and eccentricity) are carried out and the effects of various design parameters on the force performance and eccentric compression bearing capacity of the eccentric compression short columns reinforced by circular steel casing are obtained by.6.. The eccentric compression failure test of reinforced concrete short column reinforced with circular steel casing is tested. Using the calculation method of concrete-filled steel tube for reference, the concept of equivalent tightening force considering the axial deformation and shear deformation of the reinforced layer is put forward, and the eccentric compression bearing capacity of a short column reinforced by a force is obtained. At the same time, the actual condition of the reinforcement of the column has been taken into account, and the superposition is made by the superposition. The method of calculating the eccentric compression bearing capacity of reinforced short column with initial stress,.7., is used to analyze the nonlinear finite element analysis of the eccentric compression performance of reinforced concrete short columns reinforced by circular steel casing, and compare the one time bearing capacity of the short column with the eccentric compression reinforced short column with the test bearing capacity, and the numerical calculation results are carried out at the same time. The simplified formula of the bearing capacity of a short column reinforced by eccentric compression is obtained, and the effect of the initial stress on the bearing capacity of the short column reinforced by eccentric compression is deeply studied by using the above finite element analysis method. The bearing capacity of a short column reinforced by a short column and two times of the reinforced short column, and the variation of the stress and strain of each part,.8. pass, are compared. Through the study of reinforced concrete short column new and old concrete bonding surface with circular steel casing, the working mechanism, load transfer length, stress and strain distribution of new and old concrete combined surface and anchored steel bar are obtained under the effect of axial compression loading, and the shrinkage and creep of concrete are derived. The shear stress of the combined surface of the new and old concrete is summarized, and the formula of the shear strength is summed up. Finally, the minimum reinforcement ratio of the anchored steel bar is obtained according to the failure form of the combined surface.
【學位授予單位】：西南交通大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TU375.3

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