混杂纤维高性能混凝土高温性能试验

针对目前高性能混凝土的防火、防爆裂性能低,采用低熔点及高熔点纤维混杂的方法,对高性能混凝土这方面的性能进行改善,试验结果表明,混杂纤维混凝土高温性能优越,拓宽了高性能混凝土的应用范围,利于推广.  

高温环境下超静定结构的受力分析

根据弹性稳定理论原理研究了钢结构构件在高温环境下的静力特性问题，导出了高温下杆件的静力稳定临界力的计算式，并讨论了温度、长细比、构件截面形式、材料特性等因素对杆件静力稳定临界力的影响，探讨了在实际工程中如何减小结构失稳的问题，可为钢结构抗火设计提供参考。  

四面受热时型钢混凝土柱的简化计算方法研究

高温作用下型钢混凝土柱的力学性能的有限元分析是进行其抗火性能设计研究的重要途径。基于型钢和混凝土材料在高温下的力学性能曲线，简化得到其计算模型，通过ABAQUS软件分析，研究了高温下型钢混凝土柱在不同时刻的温度场分布，根据分析得到的结果确定了柱截面等温曲线的位置，结合常温下型钢混凝土柱的计算公式对高温下的计算公式进行了研究，简化得到了高温下型钢混凝土柱极限承载力的计算公式，根据已有的试验资料对所推导型钢混凝土柱简化计算方法的正确性进行了分析，结果表明：利用文中简化的计算公式计算所得的型钢混凝土柱的弯矩值为865 kN，轴力值为132 kN·m，与其试验值具有一定的吻合度。  

Creep testing and viscous behavior research on carbon constructional quality steel under high temperature

Creep tests under at a certain temperature and different stress levels were performed on two carbon constructional quality steels at a certain stress level and different temperatures,and their creep curves at high temperature were obtained based on analyzing the testing data.Taking 45 steel at a certain temperature and stress as the example,the integral creep constitutive equation and the differential stress-strain constitutive relationship were established based on the relevant rheological model,and the integral core function was also obtained.Simultaneously,the viscous coefficients denoting the viscous behavior in visco-plastic constitutive equation were determined by taking use of the creep testing data.Then the viscous coefficients of three carbon steels(20 steel,35 steel and 45 steel) were compared and analyzed.The results show that the viscosity is different due to different materials at the same temperature and stress.