鋼筋再生混凝土構(gòu)件受力性能分析及設(shè)計(jì)方法研究
發(fā)布時間：2018-08-13 19:28
【摘要】：再生混凝土技術(shù),是指將廢棄混凝土重新轉(zhuǎn)換成為粗骨料或細(xì)骨料,并將其拌制于新制混凝土中,在混凝土用天然骨料日益消耗造成骨料產(chǎn)地重大的環(huán)境負(fù)擔(dān)的今天,具有良好的應(yīng)用前景。相比于鋼筋混凝土結(jié)構(gòu)的成熟性,鋼筋再生混凝土結(jié)構(gòu)的研究處于起步階段,理論體系尚未成熟。本文在課題組試驗(yàn)基礎(chǔ)上,通過ABAQUS數(shù)值模擬技術(shù),對本課題組前期完成的鋼筋再生混凝土板、梁、柱構(gòu)件的受力進(jìn)行全過程的有限元分析,并與試驗(yàn)結(jié)果進(jìn)行對比。在此基礎(chǔ)上,對板試件的取代率、厚度；梁試件的取代率、剪跨比,配箍率,配筋率；柱試件的配筋率、取代率、偏心率、相對偏心距、長細(xì)比等參數(shù)進(jìn)行變化分析,建立拓展有限元模型,分別研究各變化參數(shù)對構(gòu)件受力性能的影響。并參照現(xiàn)行鋼筋混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范中給出的針對不同構(gòu)件的承載力的計(jì)算公式,對公式中的參數(shù)進(jìn)行修正,使其能適用于鋼筋再生混凝土結(jié)構(gòu)的工程計(jì)算以及設(shè)計(jì)工作,旨在對鋼筋再生混凝土結(jié)構(gòu)的工程設(shè)計(jì)、理論研究工作提供有價值的參考。結(jié)論表明：(1)對于板試件：極限承載力隨取代率的增加表現(xiàn)為降低之勢,提高配筋率,對單向板的受力過程、變形能力幾乎沒有影響,但對雙向板的早期剛度以及極限承載力的提高均能產(chǎn)生有利影響。(2)對于梁試件：剪跨比對極限承載力影響較為明顯,隨剪跨比增大,試件極限承載力顯著降低,破壞形態(tài)發(fā)生改變；骨料取代率對極限承載力影響不明顯,當(dāng)取代率增加時,混凝土強(qiáng)度有降低趨勢。箍筋配箍率,以及縱筋配筋率對承載力大小均有影響,增大配箍率或配筋率,將對承載力的提高產(chǎn)生有利影響,但配筋率超過時,承載力不再提高,與普通混凝土力學(xué)性能相似。(3)對于柱試件：隨配箍率的增大,極限承載力小幅度提高；隨配筋率的增大,極限承載力明顯提高；隨相對偏心距的增大,極限承載力顯著降低。在一定范圍內(nèi),長細(xì)比的增大對極限承載力的削弱較明顯。配箍率、配筋率、長細(xì)比對柱試件承載力的影響,隨著相對偏心距的增大而有被削弱的趨勢。
[Abstract]:The technology of recycled concrete is to convert waste concrete into coarse aggregate or fine aggregate, and mix it into new concrete. Today, natural aggregate used in concrete is increasingly consumed, which results in a heavy environmental burden of aggregate producing area. It has good application prospect. Compared with the maturity of reinforced concrete structures, the research of reinforced recycled concrete structures is at the initial stage, and the theoretical system is not yet mature. On the basis of the experiments of the research group, the finite element analysis of the whole process of the rebar reclaimed concrete slabs, beams and columns was carried out by using the ABAQUS numerical simulation technique, and the results were compared with the experimental results. On this basis, the substitution rate, thickness, shear span ratio, hoop ratio, reinforcement ratio of plate specimen, replacement rate, eccentricity ratio, relative eccentricity, aspect ratio and other parameters of column specimen are analyzed. The extended finite element model is established to study the influence of the varying parameters on the mechanical performance of the member. According to the calculation formula for the bearing capacity of different members given in the current design code for reinforced concrete structures, the parameters in the formula are modified so that it can be applied to the engineering calculation and design work of reinforced recycled concrete structures. The purpose of this paper is to provide a valuable reference for the engineering design of reinforced recycled concrete structure. The conclusions are as follows: (1) for the plate specimens, the ultimate bearing capacity decreases with the increase of the replacement ratio, and the reinforcement ratio increases, which has little effect on the deformation capacity of the unidirectional plate. But it has a beneficial effect on the early stiffness and the increase of ultimate bearing capacity of two-way slab. (2) for beam specimens, the shear span ratio has a more obvious effect on ultimate bearing capacity, and with the increase of shear span ratio, the ultimate bearing capacity of the specimen decreases significantly. The failure morphology is changed and the aggregate replacement ratio has no obvious effect on the ultimate bearing capacity. When the replacement ratio increases the strength of concrete tends to decrease. The ratio of stirrups and longitudinal reinforcement has an effect on the bearing capacity. The increase of hoop ratio or reinforcement ratio will have a beneficial effect on the increase of bearing capacity, but when the reinforcement ratio exceeds, the bearing capacity will no longer increase. (3) for column specimens, the ultimate bearing capacity increases slightly with the increase of hoop ratio; with the increase of reinforcement ratio, the ultimate bearing capacity increases obviously; with the increase of relative eccentricity, the ultimate bearing capacity decreases significantly. In a certain range, the increase of slenderness ratio weakens the ultimate bearing capacity obviously. The effect of hoop ratio, reinforcement ratio and aspect ratio on the bearing capacity of column specimens tends to be weakened with the increase of relative eccentricity.
【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】：2014
【分類號】：TU528
，
本文編號：2181954
[Abstract]:The technology of recycled concrete is to convert waste concrete into coarse aggregate or fine aggregate, and mix it into new concrete. Today, natural aggregate used in concrete is increasingly consumed, which results in a heavy environmental burden of aggregate producing area. It has good application prospect. Compared with the maturity of reinforced concrete structures, the research of reinforced recycled concrete structures is at the initial stage, and the theoretical system is not yet mature. On the basis of the experiments of the research group, the finite element analysis of the whole process of the rebar reclaimed concrete slabs, beams and columns was carried out by using the ABAQUS numerical simulation technique, and the results were compared with the experimental results. On this basis, the substitution rate, thickness, shear span ratio, hoop ratio, reinforcement ratio of plate specimen, replacement rate, eccentricity ratio, relative eccentricity, aspect ratio and other parameters of column specimen are analyzed. The extended finite element model is established to study the influence of the varying parameters on the mechanical performance of the member. According to the calculation formula for the bearing capacity of different members given in the current design code for reinforced concrete structures, the parameters in the formula are modified so that it can be applied to the engineering calculation and design work of reinforced recycled concrete structures. The purpose of this paper is to provide a valuable reference for the engineering design of reinforced recycled concrete structure. The conclusions are as follows: (1) for the plate specimens, the ultimate bearing capacity decreases with the increase of the replacement ratio, and the reinforcement ratio increases, which has little effect on the deformation capacity of the unidirectional plate. But it has a beneficial effect on the early stiffness and the increase of ultimate bearing capacity of two-way slab. (2) for beam specimens, the shear span ratio has a more obvious effect on ultimate bearing capacity, and with the increase of shear span ratio, the ultimate bearing capacity of the specimen decreases significantly. The failure morphology is changed and the aggregate replacement ratio has no obvious effect on the ultimate bearing capacity. When the replacement ratio increases the strength of concrete tends to decrease. The ratio of stirrups and longitudinal reinforcement has an effect on the bearing capacity. The increase of hoop ratio or reinforcement ratio will have a beneficial effect on the increase of bearing capacity, but when the reinforcement ratio exceeds, the bearing capacity will no longer increase. (3) for column specimens, the ultimate bearing capacity increases slightly with the increase of hoop ratio; with the increase of reinforcement ratio, the ultimate bearing capacity increases obviously; with the increase of relative eccentricity, the ultimate bearing capacity decreases significantly. In a certain range, the increase of slenderness ratio weakens the ultimate bearing capacity obviously. The effect of hoop ratio, reinforcement ratio and aspect ratio on the bearing capacity of column specimens tends to be weakened with the increase of relative eccentricity.
【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】：2014
【分類號】：TU528
，
本文編號：2181954
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