【摘要】：型鋼再生混凝土結(jié)構(gòu)(簡稱SRRAC)充分發(fā)揮了型鋼混凝土與再生混凝土的優(yōu)點,不僅承載力高、剛度大、抗震性能好,并且節(jié)能、環(huán)保、可持續(xù),應(yīng)用前景廣闊。目前,對于火災(zāi)后SRRAC結(jié)構(gòu)的性能劣化機理與評估理論,國內(nèi)外文獻尚屬空白,相關(guān)研究十分必要且意義重大。 本文綜合運用試驗研究、數(shù)值模擬及理論分析等手段,對火災(zāi)后SRRAC柱的力學(xué)性能進行深入研究： 首先,對再生混凝土和鋼材兩種材料進行不同火災(zāi)高溫后的力學(xué)性能測試,獲取了兩種材料的物理及力學(xué)性能指標(biāo),得到高溫后再生混凝土及鋼材力學(xué)性能隨溫度的退化規(guī)律；并提出了高溫后再生混凝土殘余抗壓強度的計算公式。 其次,以再生骨料取代率、高溫溫度、恒溫時間、型鋼保護層厚度、偏心率、配鋼和配箍形式為變化參數(shù),設(shè)計54個SRRAC柱試件進行火災(zāi)(高溫)后的力學(xué)性能試驗(其中軸壓試件48個,偏壓試件6個)。獲取了試件火災(zāi)后的燒失量,提出了根據(jù)燒失量對SRRAC構(gòu)件所經(jīng)歷最高溫度的估算方法。通過試驗,觀察了試件的破壞過程與形態(tài),揭示了其截面受力特點及破壞機理,分析了其荷載-變形特征、截面應(yīng)變分布、剩余承載力、剛度、損傷和延性等力學(xué)性能及其退化規(guī)律。結(jié)果表明,火災(zāi)高溫后SRRAC柱的承載力及剛度有所降低,延性及損傷有所增大；力學(xué)性能的退化規(guī)律主要受到最高溫度、恒溫時間、偏心率和型鋼保護層厚度等參數(shù)的影響。 此外,采用ABAQUS有限元軟件對火災(zāi)下SRRAC柱的瞬態(tài)溫度場進行數(shù)值計算,分析了截面溫度場的影響因素。結(jié)果表明,最高受火溫度、恒溫時間和型鋼保護層厚度對截面溫度場的分布有較大影響。 最后,綜合試驗研究與數(shù)值模擬分析結(jié)果,在充分考慮火災(zāi)后SRRAC柱截面力學(xué)特點以及構(gòu)件正截面承載力計算特殊性的基礎(chǔ)上。采用等效截面和強度折減的方法提出了火災(zāi)(高溫)后SRRAC柱軸心受壓及偏心受壓的正截面承載力計算公式,計算結(jié)果與試驗結(jié)果吻合較好。并且,在此基礎(chǔ)上對火災(zāi)后SRRAC結(jié)構(gòu)的評定方法進行了初探。
[Abstract]:Section steel recycled concrete structure (SRRAC) gives full play to the advantages of steel reinforced concrete (SRC) and recycled concrete (RRC). It not only has high bearing capacity, high stiffness, good seismic performance, but also has the advantages of energy saving, environmental protection, sustainability and wide application prospect. At present, for the mechanism of performance degradation and evaluation theory of SRRAC structure after fire, the literature at home and abroad is still blank, and the related research is very necessary and significant. In this paper, the mechanical properties of SRRAC columns after fire are studied by means of experimental research, numerical simulation and theoretical analysis. The mechanical properties of recycled concrete and steel after high temperature fire were tested and the physical and mechanical properties of the two materials were obtained. The degradation of mechanical properties of recycled concrete and steel after high temperature was obtained. A formula for calculating the residual compressive strength of recycled concrete after high temperature is proposed. Secondly, the replacement rate of recycled aggregate, high temperature, constant temperature time, thickness of protective layer of section steel, eccentricity, steel matching and hoop form are taken as the changing parameters. Fifty-four SRRAC column specimens were designed to test their mechanical properties after fire (high temperature) (including 48 axial compression specimens and 6 bias compression specimens). The burn loss of the specimen after fire is obtained, and the estimation method of the maximum temperature of the SRRAC component is put forward according to the amount of the burn loss. Through the test, the failure process and shape of the specimen are observed, the stress characteristics and failure mechanism of the section are revealed, the load-deformation characteristics, the strain distribution of the cross-section, the residual bearing capacity and the stiffness of the specimen are analyzed. Mechanical properties such as damage and ductility and their degradation law. The results show that the bearing capacity and stiffness of SRRAC columns decrease and the ductility and damage increase after high temperature fire, and the degradation rule of mechanical properties is mainly influenced by the parameters such as maximum temperature, constant temperature time, eccentricity and thickness of protective layer of section steel. In addition, the ABAQUS finite element software is used to calculate the transient temperature field of the SRRAC column under fire, and the influence factors of the cross-section temperature field are analyzed. The results show that the maximum fire temperature, the constant temperature time and the thickness of section steel cover have great influence on the distribution of section temperature field. Finally, comprehensive experimental research and numerical simulation analysis results, on the basis of fully considering the mechanical characteristics of the SRRAC column section after fire and the particularity of the calculation of the bearing capacity of the normal section of the member. Using the method of equivalent section and strength reduction, the formulas of bearing capacity of normal section of SRRAC column subjected to axial compression and eccentric compression after fire (high temperature) are put forward. The calculated results are in good agreement with the experimental results. On this basis, the evaluation method of SRRAC structure after fire is discussed.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU398.9

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