中文摘要：

借鉴复合材料力学的分析方法，建立一种分层剪滞模型，并结合线弹性断裂力学的能量法，研究了碳纤维薄板加固含裂缝素砼梁和钢筋增强砼梁的四点弯曲破坏问题，求得的破坏荷载大多与试验较吻合，为此类构件的弯曲破坏分析提供了一种新的研究途径和方法．

英文摘要：

Using the analytical methods of composite mechanics for reference, a layering shear-lag model is established to study the stress redistributions of plain concrete and reinforced concrete beams with a crack, bonded by carbon fiber sheets, under 4-point bending. The failure loads that relatively coincide with experimental values in most cases are obtained based on the energy principle in fracture mechanics. The model and methods proposed by the paper may supply the failure analysis of the members with a new way of study.