本文選題：RC框架結(jié)構(gòu) + 強(qiáng)柱弱梁�。� 參考：《中國(guó)地震局工程力學(xué)研究所》2017年碩士論文

【摘要】：鋼筋混凝土(RC)框架結(jié)構(gòu)中,現(xiàn)澆樓板與相鄰框架梁整體強(qiáng),形成協(xié)同受力機(jī)制�，F(xiàn)澆樓板極大影響了相鄰梁的受力和變形性能,導(dǎo)致規(guī)范要求的“強(qiáng)柱弱梁”破壞機(jī)制難以實(shí)現(xiàn)。目前,對(duì)于這一課題的研究要么針對(duì)框架梁柱節(jié)點(diǎn)處現(xiàn)澆樓板對(duì)梁荷載分配產(chǎn)生的影響,要么通過有限元軟件建立結(jié)構(gòu)模型整體分析樓板對(duì)結(jié)構(gòu)屈服機(jī)制的影響,兩者對(duì)于樓板本身工作機(jī)理以及樓板和梁柱的共同作用對(duì)結(jié)構(gòu)性能的影響研究不足,均難以定量給出實(shí)際工作中樓板對(duì)相鄰梁的影響。本文結(jié)合上述兩種方法的優(yōu)勢(shì),利用ABAQUS軟件強(qiáng)大的非線性分析功能,對(duì)鋼筋混凝土框架結(jié)構(gòu)進(jìn)行精細(xì)化實(shí)體單元建模,更準(zhǔn)確的分析了樓板工作機(jī)理及對(duì)框架梁受力和對(duì)結(jié)構(gòu)整體性能的影響。本文在總結(jié)大量相關(guān)文獻(xiàn)的基礎(chǔ)上,采用ABAQUS有限元軟件,建立帶樓板、空框架以及附加樓板質(zhì)量的空框架三種類型RC框架結(jié)構(gòu)模型,并通過模態(tài)分析和側(cè)向靜力加載的方式進(jìn)行分析,從多個(gè)角度研究了現(xiàn)澆樓板對(duì)RC框架結(jié)構(gòu)“強(qiáng)柱弱梁”屈服機(jī)制的影響。主要工作和成果如下:(1)通過模態(tài)分析和側(cè)向靜力加載的方法,采用有限元軟件ABAQUS進(jìn)行計(jì)算分析,對(duì)比了不同模型的自振頻率以及能力曲線,研究了樓板對(duì)結(jié)構(gòu)整體側(cè)向剛度的影響規(guī)律,并定義結(jié)構(gòu)側(cè)向剛度增大系數(shù)來(lái)評(píng)估樓板對(duì)結(jié)構(gòu)剛度的增強(qiáng)作用,最終通過回歸分析給出了結(jié)構(gòu)側(cè)向剛度增大系數(shù)與板厚、梁高的擬合經(jīng)驗(yàn)公式。結(jié)果顯示樓板對(duì)RC框架結(jié)構(gòu)整體側(cè)向剛度的影響隨著板厚的增大而增大,隨著梁高的增大而減小。(2)通過分析帶樓板與空框架模型破壞情況,對(duì)比了兩者混凝土受拉破壞、混凝土受壓破壞以及梁端受拉鋼筋屈服情況,結(jié)果顯示樓板對(duì)RC框架結(jié)構(gòu)屈服機(jī)制影響顯著,不利于“強(qiáng)柱弱梁”屈服機(jī)制的實(shí)現(xiàn)。并分析了樓板對(duì)RC框架結(jié)構(gòu)影響的主要因素—板內(nèi)鋼筋的應(yīng)力情況,研究了距離梁不同遠(yuǎn)近的板筋應(yīng)力分布情況,同時(shí)綜合分析了不同節(jié)點(diǎn)類型、板筋類型以及頂點(diǎn)位移等因素的影響。(3)通過分析不同板厚和梁高帶樓板模型的板筋應(yīng)力分布情況,給出了板筋應(yīng)力分布隨板厚和梁高的變化規(guī)律。進(jìn)一步采用有效翼緣寬度度量樓板對(duì)框架梁受彎承載力的強(qiáng)化作用,結(jié)果顯示有效翼緣寬度隨板厚的增大而增大,隨梁高增大在不同類型節(jié)點(diǎn)處變化情況有差異,在此基礎(chǔ)上給出了不同類型節(jié)點(diǎn)處有效翼緣寬度隨梁高和板厚變化的擬合經(jīng)驗(yàn)公式。
[Abstract]:In the RC frame structure, the cast-in-place floor and adjacent frame beams are strong, forming a synergistic force mechanism.Cast-in-place slab greatly affects the mechanical and deformation behavior of adjacent beams, which results in the failure mechanism of "strong column and weak beam" which is required by the code is difficult to be realized.At present, the research on this subject is either aimed at the effect of cast-in-place floor at the joint of Liang Zhu frame on the load distribution of beam, or establishes the structural model to analyze the influence of floor on the yield mechanism of the structure by finite element software.It is difficult to quantify the influence of floor slab on adjacent beams in practical work because of the lack of research on the working mechanism of floor and the influence of floor and Liang Zhu on structural performance.Based on the advantages of the above two methods and the powerful nonlinear analysis function of ABAQUS software, this paper models the reinforced concrete frame structure with fine solid element.The working mechanism of floor slab and its influence on the stress of frame beam and the overall performance of the structure are analyzed more accurately.On the basis of summarizing a large number of related documents, this paper establishes three types of RC frame structure models with floor slab, hollow frame and additional floor mass by using ABAQUS finite element software.Through modal analysis and lateral static loading, the influence of cast-in-place floor on the yield mechanism of RC frame structure "strong column and weak beam" is studied from several angles.The main work and results are as follows: (1) by means of modal analysis and lateral static loading, finite element software ABAQUS is used to calculate and analyze, and the natural vibration frequency and capability curves of different models are compared.The influence of floor slab on the lateral stiffness of the whole structure is studied, and the enhancement factor of lateral stiffness of the structure is defined to evaluate the enhancement effect of the floor slab on the structural stiffness. Finally, the increase coefficient of lateral stiffness and the thickness of the slab are given by regression analysis.The empirical formula of beam height fitting.The results show that the influence of floor on the overall lateral stiffness of RC frame structure increases with the increase of slab thickness and decreases with the increase of beam height.The compressive failure of concrete and the yield of tensile steel bar at the end of beam show that the floor slab has a significant influence on the yield mechanism of RC frame structure, which is not conducive to the realization of yield mechanism of "strong column and weak beam".The stress of steel bar in the slab is analyzed, the stress distribution of the steel bar in different distance from the beam is studied, and the different types of joints are analyzed synthetically at the same time, the influence of floor slab on RC frame structure is analyzed.By analyzing the stress distribution of slab reinforcement with different slab thickness and beam height, the variation of plate reinforcement stress with slab thickness and beam height is given.Furthermore, the effective flange width is used to measure the strengthening effect of the floor slab on the flexural bearing capacity of the frame beam. The results show that the effective flange width increases with the increase of plate thickness and varies with the height of the beam at different types of joints.On this basis, the fitting empirical formula of the effective flange width with the beam height and plate thickness at different types of joints is given.
【學(xué)位授予單位】：中國(guó)地震局工程力學(xué)研究所
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375.4

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