本文選題：偏心受壓　切入點：矩形鋼管　出處：《華僑大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著我國城市化進程的持續(xù)推進,建筑垃圾與日俱增,其中工程廢棄混凝土約占建筑垃圾的48.35%,如何綠色環(huán)保的處理這些廢棄混凝土成為了亟待解決的環(huán)境問題。將廢棄混凝土破碎篩分后用于再生混凝土是目前較為常見的一種處理方法之一,但再生混凝土強度及彈性模量低、收縮徐變大、流動性差等缺點嚴重阻礙其推廣應用。為解決此矛盾,本課題組引入薄壁鋼管-再生混合混凝土的研究,該結(jié)構(gòu)能充分發(fā)揮各自材料的優(yōu)勢,強度高、塑性好、施工速度快,同時免去了再生骨料篩分、凈化等繁瑣程序,節(jié)省了大量的資金和能源。本文選用ANSYS有限元模擬與試驗相對比的方法,探討偏心荷載作用下矩形鋼管再生混合砼的本構(gòu)關系。選取偏心率、高寬比、含鋼率、混合比為變量,設計23個偏壓試件和3個軸壓試件進行試驗研究。研究結(jié)果表明:(1)矩形鋼管再生混合砼短柱在偏心荷載作用下展現(xiàn)較好的力學性能,破壞形態(tài)以腰鼓形破壞為主,有少量試件出現(xiàn)剪切破壞;(2)對于本文試驗構(gòu)件的極限承載力,偏心率越大,極限承載力越小,含鋼率越大,極限承載力越大,而高寬比和混合比對承載力的影響有限;(3)影響偏壓矩形鋼管再生混合混凝土短柱延性的主要因素是偏心率和高寬比,偏心率大的試件變形性能更好,高寬比越大,試件延性越差,含鋼率和混合比對試件延性的影響有限。結(jié)合理論研究與試驗數(shù)據(jù)回歸分析,提出偏心率對緊箍力影響的修正系數(shù),將該系數(shù)應用于課題組已有本構(gòu)關系,得到適用于偏心受壓矩形鋼管再生混合混凝土的應力-應變關系模型,采用修正后的模型進行有限元計算,發(fā)現(xiàn)計算結(jié)果與試驗結(jié)果吻合良好。選用國內(nèi)外典型規(guī)范(程)CECS159:2004、DBJ13-51-2003、ACI318-11、AIJ-1997、BS5400-2005、EC4-2004計算偏心受壓矩形鋼管再生混合混凝土短柱極限承載力。根據(jù)福建省地方標準DBJ計算所得數(shù)據(jù)和試驗數(shù)據(jù)最為接近,且數(shù)據(jù)波動性較小,建議選用上述規(guī)程計算矩形鋼管再生混合短柱在偏心荷載作用下的極限承載力。最后結(jié)合理論研究和試驗數(shù)據(jù)回歸分析,給出了矩形鋼管再生混合短柱在偏心荷載作用下的極限承載力簡化計算式。
[Abstract]:With the continuous development of urbanization in China, construction waste is increasing day by day. Engineering waste concrete accounts for about 48.35% of construction waste. How to deal with the waste concrete green has become an urgent environmental problem. One of the ways to deal with, However, the shortcomings of recycled concrete, such as low strength and elastic modulus, large shrinkage and creep, poor fluidity and so on, seriously hinder its popularization and application. In order to solve this contradiction, this paper introduces the research of thin-walled steel tube-recycled mixed concrete. The structure can give full play to the advantages of their respective materials, high strength, good plasticity, fast construction speed, and at the same time, it eliminates the tedious procedures such as screening and purification of recycled aggregate. In this paper, the constitutive relation of recycled concrete of rectangular steel tube under eccentric load is discussed by using ANSYS finite element simulation and experimental method. The eccentricity ratio, aspect ratio, steel content ratio and mixing ratio are selected as variables. Twenty-three eccentric compression specimens and three axial compression specimens were designed for experimental study. The results show that the recycled concrete short columns of rectangular steel tubes exhibit better mechanical properties under eccentric loading, and the failure mode is mainly waist drum failure. For the ultimate bearing capacity of the tested members, the greater the eccentricity, the smaller the ultimate bearing capacity, the greater the steel content, the greater the ultimate bearing capacity. However, the influence of aspect ratio and mixing ratio on the bearing capacity is limited.) the main factors affecting ductility of rectangular steel tube regenerated concrete short columns are eccentricity and ratio of height to width. The specimen with large eccentricity has better deformation performance and higher aspect ratio. The worse the ductility of the specimen, the less the influence of the steel content and the mixing ratio on the ductility of the specimen. Combined with the regression analysis of theoretical research and experimental data, the modified coefficient of the influence of eccentricity on the hoop force is put forward, which has been applied to the constitutive relation of the research group. The stress-strain relationship model for recycled concrete filled rectangular steel tubes under eccentric compression is obtained. The modified model is used to calculate the stress-strain relationship. It is found that the calculated results are in good agreement with the test results. The ultimate bearing capacity of recycled concrete filled rectangular steel tubes with eccentrically compressed rectangular steel tubes is calculated according to the local standard DBJ of Fujian Province, and the ultimate bearing capacity of recycled concrete columns of rectangular steel tubes under eccentric compression is calculated according to the typical domestic and foreign codes (CCECS159: 2004DJ13-51-20033-2003) and AIJ-1997 / BS5400-2005 / EC4-2004. The test data are closest, It is suggested that the above rules be used to calculate the ultimate bearing capacity of rectangular steel tube regenerated mixed short columns under eccentricity load. Finally, combined with theoretical research and experimental data regression analysis, A simplified formula for calculating the ultimate bearing capacity of rectangular steel tube regenerated mixed short columns under eccentric load is presented.
【學位授予單位】：華僑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU398.9

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