【摘要】：通過自行設計的裝置測量了高溫后粘結問題中的化學膠結力和摩擦系數(shù),得出了它們隨溫度經(jīng)歷的變化規(guī)律。利用測得的基礎參數(shù)定義了鋼筋與混凝土界面的彈塑性庫侖摩擦準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行為。模型通過對鋼筋肋的顯式離散實現(xiàn)了鋼筋肋與混凝土間機械咬合作用的模擬。數(shù)值結果和試驗數(shù)據(jù)的對比表明,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滑移。最后,利用有限元模型對400℃溫度經(jīng)歷拔出過程中的應力分布及裂縫的擴展進行了細致的研究。
[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：2395385