Underpinning beam is a key structure of FRP exhaust cylinder for bearing compression and it’s hard to study the shear propertyaccording to existing shear strength test because of the shape and loading features. The practical application of underpinning beam in the FRP exhaust cylinder was exploratively simulated using the model experiment for studying the compression-shear behavior. The model experiment mainly investigated the relationship between the shape,overlay structure of underpinning beam and the shear strength. The model experiment discovered that the shape and overlay structure had an important effect on shear strength of underpinning beam.%牛腿梁作为玻璃钢排烟筒中承受压剪作用的关键细部结构，由于其形状和受力形式的特点，很难用现有的剪切强度标准方法进行实验研究。结合牛腿梁结构的形状特点和受力特点，探索性地采用模型试验法模拟排烟筒工程中的牛腿梁结构并进行剪切性能的实验研究。主要考察了在压缩作用力下，牛腿梁结构的形状以及铺层结构变化与剪切性能的关系。通过模型实验法发现，牛腿梁的厚度和铺层结构变化对其剪切性能有重要影响。
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