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选取适当的混凝土和钢筋的热工参数及其高温后的力学性能,采用有限元分析软件ANSYS对标准升温条件下RC梁的截面温度场分布进行瞬态热分析,利用高度不变、宽度折减的方式得到受火后的等效截面,并在规范给出的短期刚度计算公式的基础上进行了修正。采用刚度解析法推导了高性能复合砂浆钢筋网加固高温作用后RC梁的刚度计算式,计算时考虑了加固时因未完全卸载和重力引起的应力-应变滞后现象,最后结合现场试验来验证所推导计算式的合理性。试验结果表明,高性能复合砂浆钢筋网可以有效提高构件的抗弯刚度。通过挠度理论计算值与试验值的对比可知,理论值均大于现场试验值,且相差在10%以内,高性能复合砂浆钢筋网加固高温作用后RC梁短期刚度的计算式在实际工程应用中偏于安全。
Select the appropriate thermal parameters of concrete and steel and its mechanical properties after high temperature, the use of finite element analysis software ANSYS standard temperature conditions of the RC beam cross-section temperature field transient thermal analysis, the use of the same height, width reduction The equivalent cross-section of the fire is obtained, and the short-term stiffness formula given in the specification is amended. Stiffness analytical method was used to deduce the stiffness formula of RC beams strengthened by high performance composite mortar reinforcement mesh under high temperature. The stress-strain hysteresis caused by incomplete unloading and gravity was considered in the calculation. Finally, the field test was used to verify Derivation of the formula is reasonable. The test results show that the high performance composite mortar steel mesh can effectively improve the flexural rigidity of the component. According to the comparison between calculated value of deflection and test value, the theoretical values are all larger than the field test values, and the differences are less than 10%. The formula of short-term stiffness of RC beams strengthened by high-performance composite mortar reinforcing steel mesh in practical application In safety.