An anisotropic damage model for concrete subjected to compressive fatigue load is developed based on continuum damage mechanics and the concept of boundary surface.

基于边界面概念和损伤力学理论，建立了混凝土受压各向异性损伤模型。

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Shear strength and shear strain are the basic properties in mechanics of concrete. They also serve as important data for finite element and failure criterion research on concrete.

抗剪强度和剪切变形是砼的基本力学性能，又是强度理论研究和有限元分析的重要数据。

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In this paper two concrete problems concerned fundamental questions in quantum mechanics are discussed.

本文研究了量子力学的基本性问题中的两个具体问题。

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