【摘要】：通過自行設(shè)計(jì)的裝置測(cè)量了高溫后粘結(jié)問題中的化學(xué)膠結(jié)力和摩擦系數(shù),得出了它們隨溫度經(jīng)歷的變化規(guī)律。利用測(cè)得的基礎(chǔ)參數(shù)定義了鋼筋與混凝土界面的彈塑性庫(kù)侖摩擦準(zhǔn)則并將其植入有限元模型;采用面-面接觸的接觸單元模擬混凝土與鋼筋界面的力學(xué)行為。模型通過對(duì)鋼筋肋的顯式離散實(shí)現(xiàn)了鋼筋肋與混凝土間機(jī)械咬合作用的模擬。數(shù)值結(jié)果和試驗(yàn)數(shù)據(jù)的對(duì)比表明,該文提出的模型可以較好的模擬高溫后帶肋鋼筋和混凝土之間的粘結(jié)滑移。最后,利用有限元模型對(duì)400℃溫度經(jīng)歷拔出過程中的應(yīng)力分布及裂縫的擴(kuò)展進(jìn)行了細(xì)致的研究。
[Abstract]:The chemical bonding force and friction coefficient of the bonding problem after high temperature were measured by a self-designed device, and the variation law of them with the temperature was obtained. The elastic-plastic Coulomb friction criterion of the reinforced concrete interface is defined and implanted into the finite element model by using the measured basic parameters, and the mechanical behavior of the interface between concrete and steel bar is simulated by the contact element with plane to plane contact. The model simulates the mechanical bite between reinforcement rib and concrete by explicit discretization of reinforcement rib. The comparison of numerical results and experimental data shows that the proposed model can well simulate the bond-slip between ribbed bars and concrete after high temperature. Finally, the stress distribution and crack propagation during the pull-out process at 400 鈩，

本文編號(hào)：2395385