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采用非线性程序,模拟火灾中钢筋混凝土结构中混凝土与钢筋之间的粘结机理。通过1个梁的拉拔力试验、1个特定温度下的梁试验和在两种标准火灾中的4个足尺梁试验,证明数值模型的准确可靠性。该模型对火灾中钢筋混凝土构件和结构响应的预测满足精度要求,粘结连接单元也能满足火灾中钢筋混凝土结构3维分析的计算精度和计算效率的要求。结果表明:混凝土与钢筋之间的粘结条件对钢筋混凝土结构的耐火性能有重要影响,尤其当钢筋的温度较高(大于500°C)时。目前使用的火灾中钢筋混凝土结构粘结条件的假设是偏不安全的。
A non-linear program is used to simulate the bonding mechanism between concrete and rebar in reinforced concrete structures in fire. The accuracy of the numerical model is verified by the test of the pullout force of a beam, the beam test at a specific temperature and the four full-scale beams in two standard fires. The model predicts the response of reinforced concrete members and structures in fires to meet the requirements of accuracy. The bonded connection unit can also meet the requirements of calculation accuracy and calculation efficiency of 3-D analysis of reinforced concrete structures in fire. The results show that the bonding condition between concrete and rebar has an important effect on the fire resistance of reinforced concrete structures, especially when the rebar temperature is higher than 500 ° C. The current assumptions used in the construction of reinforced concrete structures in fires are not safe.