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首页> 外文会议>2nd International RILEM Symposium on Adhesion between Polymers and Concrete, 2nd, Sep 14-17, 1999, Dresden, Germany >THERMALLY-INDUCED INTERFACE STRESSES IN POLYMER CONCRETE - PORTLAND CEMENT CONCRETE COMPOSITE BEAMS
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THERMALLY-INDUCED INTERFACE STRESSES IN POLYMER CONCRETE - PORTLAND CEMENT CONCRETE COMPOSITE BEAMS

机译：聚合物混凝土-硅酸盐水泥混凝土复合梁的热诱导界面应力。

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摘要

A narrow transverse strip of a polymer concrete overlay was modeled as a two-layered composite beam to quantify the thermally-induced internal stresses when the polymer concrete overlay is subjected to environmental temperature changes. Interface shear and normal stresses in the composite beam model subjected to a uniform temperature change were analytically determined using an existing analytical procedure in plane stress. Parametric studies were then performed to investigate the influence of the thickness and the modular ratios of the top layer (thin polymer concrete) to the bottom layer (portland cement concrete substrate) on stress development. All analysis results were presented for the uniform temperature drop of 100 ℃. The material properties included very low elastic modulus of polymer concrete and very thin overlay to investigate the thermally-induced stresses in a realistic polymer concrete overlay. The results of analysis revealed that the development of interface shear and normal stresses is confined to a narrow region near the end of the beam over a distance approximately equal to the total thickness of the composite beam. The parametric study results revealed that the interface shear and normal stresses decrease with decreasing thickness and elastic modulus of the top layer when the thickness of the top layer is significantly smaller than that of the bottom layer. Interface shear stress played a more dominant role than the interface normal stress in thin polymer concrete overlays subjected to the uniform temperature changes. The current study results can be used to estimate the thermally-induced interface stresses in a two-layered structure such as polymer concrete overlays.
机译：将聚合物混凝土外墙的窄横条建模为两层复合梁，以量化当聚合物混凝土外墙经受环境温度变化时热引起的内应力。使用现有的平面应力分析程序，可以解析地确定经受均匀温度变化的复合梁模型中的界面剪切力和法向应力。然后进行参数研究，以研究顶层（薄聚合物混凝土）与底层（硅酸盐水泥混凝土基材）的厚度和模量比对应力发展的影响。所有分析结果均针对100℃的均匀降温给出。材料性能包括非常低的聚合物混凝土弹性模量和非常薄的覆盖层，以研究实际的聚合物混凝土覆盖层中的热诱导应力。分析结果表明，界面剪切和法向应力的发展被限制在梁末端附近的狭窄区域，其距离大约等于复合梁的总厚度。参数研究结果表明，当顶层的厚度显着小于底层的厚度时，界面剪切力和正应力会随着顶层的厚度和弹性模量的减小而减小。在均匀温度变化下，薄聚合物混凝土面板中的界面剪应力比界面法向应力发挥更大的作用。当前的研究结果可用于估算两层结构（如聚合物混凝土覆盖层）中的热诱导界面应力。

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