摘要
模拟青藏高原昼夜交替变化的气温,对钢—混凝土结合梁试件进行理论和实验研究。将试件冷却至-50℃,然后置于室温环境中,在自然对流条件下升至室温,测量试件内测点的温度。采用控制容积法对钢—混凝土结合梁试件升温过程的温度分布进行数值计算。计算结果与实验值基本吻合。对钢—混凝土结合梁试件的温度分布情况和变化规律的研究结果表明,试件内部温度分布不均匀,变化较大。青藏高原的气温大幅变化可能会对青藏线铁路桥梁产生不良影响。
Theoretical and test studies have been carried out on steel-concrete composite beam specimen by simulating the changes of temperatures between day and night on Qinghai-Tibet plateau. In the experiment, the temperature of the steel-concrete specimen was lowered from indoor temperature to -50°C at first, then it was put in room temperature environment and risen to indoor temperature under natural convection. The temperature of the testing point inside the specimen was measured. The temperature distribution in temperature rising process of steel-concrete composite beam is calculated by volume-control method. The numerical calculation results basically agree with the test values. From the research on the temperature distribution and the change regularity of steel-concrete composite beam specimen, the result indicates that the temperature distribution is uneven and changes greatly inside the specimen. The great changes of temperature on Qinghai-Tibet plateau would be likely to bring some unfavorable effects on railroad bridges along Qinghai-Tibet line.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2005年第1期42-47,共6页
China Railway Science
基金
铁道部科技研究开发计划项目(2002G025)
关键词
桥梁工程
温度分布
数值计算
钢-混凝土结合梁
Beams and girders
Boundary conditions
Concretes
Mathematical models
Numerical methods
Steel
Temperature distribution
