混凝土T梁的温度—位移测试及计算研究

通过模型试验,测试了自然环境下混凝土T梁内部温度和相应位移的分布状况,获得数万个实测数据并进行数理统计分析,提出对常温下采用理论公式计算温度位移的修正系数.文中还进行了有限元热分析计算,并与试验资料比较,认为即使按桥梁规范考虑了环境湿度变化带来的混凝土的收缩变形量,有限元计算值与实测值仍存在较大的差异.上述研究为无伸缩缝T梁桥的温度位移计算提供理论依据,也为其他截面形式的混凝土桥梁在计算温度引起位移时提供参考.

Test and study on temperature-displacement of concrete T beam

Based on an concrete T beam model test,the distributions of its inner temperature in the natural environment and the corresponding thermal deformation are tested,with tens of thousands of measured data obtained.Through the analysis of data collected by mathematical statistics,the correction coefficient of the formula computing the thermal deformation of concrete bridge is brought out.And the FEM thermal analysis is taken.But there is much difference between the test dates and the computing results,with shrinkage distortion generated by the change of the dampness according to the code has been eliminated.The researching results mentioned above provide the base to computing the thermal deformation of the concrete T beam with jointless bridge,and provide the reference to computing the thermal deformation of other sectional concrete bridge.