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对自然环境内钢-混凝土组合梁截面内温度进行了测试,以温差梯度为计算模型,基于弹性理论,推导了不同温差模式下组合梁交界面上的剪力、剪应力、相对滑移应变与变形以及弯曲变形曲率计算公式。分析结果表明:在自然温变情况下组合梁截面内存在温差,同时混凝土翼板内温度分布不均匀;界面剪力最大值在跨中部位,向梁端部逐渐递减为0;剪应力、相对滑移应变与变形在梁端部达到最大值,向跨中逐渐递减为0;界面内力及变形与温差大小呈线性正比,斜率与混凝土板内温度分布模式有关;混凝土板内温度分布模式及厚度是截面内力和变形的主要影响因素。
The temperature inside the section of steel-concrete composite beam in natural environment was tested, and the temperature gradient was used as the calculation model. Based on the elastic theory, the shear stress, shear stress, relative slip strain and Deformation and bending deformation calculation formula. The results show that there is a temperature difference in the cross section of the composite beam under natural temperature change, and the temperature distribution in the concrete wing is not uniform. The maximum interfacial shear force decreases gradually to zero at the middle midpoint and the shear stress is relatively The slip strain and deformation reach the maximum value at the end of the beam and gradually decrease to 0 in the span. The internal force and deformation of the interface are linearly proportional to the size of the temperature difference. The slope is related to the temperature distribution pattern inside the concrete slab. The temperature distribution pattern and thickness It is the main influence factor of internal force and deformation of cross section.