【摘要】：預(yù)測地震荷載下鋼筋混凝土柱的力學(xué)性能,對評估震后混凝土結(jié)構(gòu)的安全性和震害損失具有重要意義。由于混凝土材料在受力過程中的復(fù)雜性,目前對鋼筋混凝土結(jié)構(gòu)力學(xué)性能的模擬主要依靠數(shù)值方法。已有的數(shù)值模擬方法大都基于有限元法,將混凝土視為連續(xù)體,通過人為定義參數(shù)來指定混凝土的滯回本構(gòu),因此存在一定的主觀性與局限性。該文結(jié)合擴(kuò)展有限元法與斷裂準(zhǔn)則,直接模擬混凝土裂縫的開展與閉合,并考慮鋼筋和混凝土的粘結(jié)滑移作用,通過數(shù)值計(jì)算,直接再現(xiàn)了鋼筋混凝土結(jié)構(gòu)在低周反復(fù)荷載下的力學(xué)行為。模擬方法得到了試驗(yàn)的驗(yàn)證,與結(jié)果吻合較好。該文進(jìn)一步分析了鋼筋混凝土柱的滯回行為中混凝土、鋼筋的各自作用和相互抵消行為,從細(xì)觀的角度,在機(jī)理上揭示了捏攏效應(yīng)出現(xiàn)的三個主要原因。
[Abstract]:It is important to predict the mechanical properties of reinforced concrete columns under earthquake load and to evaluate the safety and damage loss of post-earthquake concrete structures. Because of the complexity of concrete material in the process of loading, the numerical method is used to simulate the mechanical properties of reinforced concrete structures. Most of the existing numerical simulation methods are based on finite element method, the concrete is regarded as a continuum, and the hysteretic constitutive structure of concrete is determined by defining parameters artificially, so it has some subjectivity and limitation. Combined with the extended finite element method and fracture criterion, this paper directly simulates the development and closure of concrete cracks, and considers the bond-slip effect of steel bar and concrete. The mechanical behavior of reinforced concrete structures under low cyclic loading is directly reproduced. The simulation method is verified by experiments and the results are in good agreement. In this paper, the respective action and counteracting behavior of reinforced concrete columns in hysteretic behavior of reinforced concrete columns are further analyzed. From the viewpoint of meso, three main reasons for the occurrence of pinch effect are revealed from the point of view of meso.
【作者單位】： 同濟(jì)大學(xué)結(jié)構(gòu)工程與防災(zāi)研究所;
【基金】：國家自然科學(xué)基金項(xiàng)目(51008235,51378397) 上海市工程結(jié)構(gòu)新技術(shù)重點(diǎn)實(shí)驗(yàn)室開放課題項(xiàng)目(2013-KF03)
【分類號】：TU375.3

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