【摘要】：地震作用下,鋼筋混凝土框架結(jié)構(gòu)最理想的破壞形式為“強(qiáng)柱弱梁”。當(dāng)前結(jié)構(gòu)設(shè)計(jì)領(lǐng)域大多依據(jù)這一期望破壞形式進(jìn)行結(jié)構(gòu)的抗震設(shè)計(jì)。可是,大量的結(jié)構(gòu)破壞試驗(yàn)與已發(fā)生的地震破壞表明:按照現(xiàn)行規(guī)范進(jìn)行抗震設(shè)計(jì)的大部分鋼筋混凝土框架結(jié)構(gòu),其在遭受復(fù)雜地震作用力后發(fā)生破壞的機(jī)制并非預(yù)期的“強(qiáng)柱弱梁”屈服模式。究其原因,結(jié)構(gòu)設(shè)計(jì)人員在進(jìn)行結(jié)構(gòu)抗震設(shè)計(jì)時(shí),普遍忽略了現(xiàn)澆樓板對(duì)框架梁抗彎承載力的貢獻(xiàn)。在建筑施工過程中,現(xiàn)澆樓板與框架梁、柱之間往往澆筑在一起,雖然提高了結(jié)構(gòu)的整體性,但是二者之間相互作用的復(fù)雜性容易被忽略;而結(jié)構(gòu)設(shè)計(jì)人員一般假定現(xiàn)澆樓板是剛性構(gòu)件,簡單的采用剛度增大系數(shù)來考慮樓板的貢獻(xiàn),而忽略了問題的核心。采用此種處理方式容易使結(jié)構(gòu)產(chǎn)生以柱鉸為主的屈服耗能機(jī)制,帶來巨大人身安全和經(jīng)濟(jì)財(cái)產(chǎn)損失,完全不符合實(shí)際預(yù)期,所以關(guān)于現(xiàn)澆樓板如何影響框架“強(qiáng)柱弱梁”屈服機(jī)制還有待進(jìn)一步研究分析。本文深入分析了現(xiàn)澆樓板對(duì)框架結(jié)構(gòu)破壞形式的影響規(guī)律。重點(diǎn)包含以下幾部分:1、對(duì)考慮現(xiàn)澆樓板影響的框架節(jié)點(diǎn)試驗(yàn)和理論分析資料進(jìn)行系統(tǒng)的整理分析,初步探尋現(xiàn)澆樓板在改變框架結(jié)構(gòu)屈服機(jī)制的過程中核心的作用。2、首先建立純框架、帶樓板框架兩種結(jié)構(gòu)模型,按照規(guī)范規(guī)定進(jìn)行結(jié)構(gòu)內(nèi)力和配筋的計(jì)算,然后根據(jù)計(jì)算結(jié)果運(yùn)用SAP2000建立精確的有限元模型,采用Push-over分析模式分別對(duì)兩種結(jié)構(gòu)模型做靜力推覆分析,以探究兩種模型破壞形式的差別;接下來,改變加載方法和分析工況,深入研究樓板如何影響框架的屈服機(jī)制。3、建立不同“有效翼緣寬度”空間框架對(duì)比模型,進(jìn)行非線性有限元分析,以確定現(xiàn)澆樓板對(duì)框架結(jié)構(gòu)破壞形式的影響評(píng)估標(biāo)準(zhǔn),提出合理的“有效翼緣寬度”取值建議。4、在理論推導(dǎo)和有限元模擬分析的基礎(chǔ)上得出結(jié)論:在進(jìn)行框架結(jié)構(gòu)設(shè)計(jì)分析時(shí),應(yīng)綜合考慮樓板鋼筋等多種復(fù)雜因素對(duì)破壞形式的影響,通過符合實(shí)際的“有效翼緣寬度”計(jì)算公式取值,以實(shí)現(xiàn)抗震規(guī)范要求的“強(qiáng)柱弱梁”設(shè)計(jì)準(zhǔn)則,為改進(jìn)現(xiàn)行結(jié)構(gòu)抗震計(jì)算方法提供依據(jù)。
[Abstract]:Under earthquake, the most ideal failure form of reinforced concrete frame structure is "strong column and weak beam". At present, the seismic design of structures is mostly carried out according to the expected failure form in the field of structural design. However, a large number of structural failure tests and the earthquake damage that have occurred show that most of the reinforced concrete frame structures designed according to current codes are reinforced concrete frames. The failure mechanism is not the expected "strong column and weak beam" yield model. The reason is that the contribution of cast-in-place floor slab to the flexural bearing capacity of frame beam is generally neglected when structural designers carry out seismic design. In the process of building construction, cast-in-place floor slab, frame beam and column are often poured together, although the integrity of the structure is improved, the complexity of the interaction between the two is easily ignored. The structural designers generally assume that the cast-in-place floor is a rigid member, and simply consider the contribution of the floor by using the stiffness increase coefficient, while ignoring the core of the problem. It is easy for the structure to produce a yield energy dissipation mechanism based on column hinges, resulting in huge personal safety and economic and property losses, which is completely out of line with actual expectations. Therefore, how cast-in-place floor affects the yield mechanism of frame "strong column and weak beam" needs further study and analysis. In this paper, the influence of cast-in-place floor slab on the failure form of frame structure is analyzed in depth. The main contents are as follows: 1. Systematic analysis of the data of frame joint test and theoretical analysis considering the influence of cast-in-place floor slab, and preliminary exploration of the core role of cast-in-place floor slab in the process of changing the yield mechanism of frame structure. First, two kinds of structural models, pure frame and floor frame, are established to calculate the internal force and reinforcement of the structure according to the code, and then the accurate finite element model is established by using SAP2000 according to the result of the calculation. The Push-over analysis model is used to analyze the static force of the two structural models in order to explore the difference of the failure forms of the two models. Then, changing the loading method and analysis conditions, deeply studying how floor slab affects the yield mechanism of the frame. 3. Different "effective flange width" spatial frame contrast models are established, and the nonlinear finite element analysis is carried out. In order to determine the evaluation criteria of the impact of cast-in-place floor slab on the failure form of frame structure, a reasonable value of "effective flange width" is proposed. On the basis of theoretical derivation and finite element simulation analysis, it is concluded that in the design and analysis of frame structure, the influence of various complex factors such as floor steel bar and other complex factors on the failure form should be considered synthetically. According to the actual calculation formula of "effective flange width", the design criterion of "strong column and weak beam", which is required by seismic code, is realized, which provides the basis for improving the current seismic calculation method of structures.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU375.4;TU352.11

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