用有限元软件ABAQUS对1根原梁和18根索梁进行了加固前后的非线性模拟.与原梁相比,索梁在施加体外预应力阶段,均出现微量反拱;在施加使用荷载时,索-斜腹杆-梁的组合受力体系在体外预应力作用下内力重分布现象显著,改变了粱混凝土截面的应力分布规律,提高了梁的开裂荷载和极限荷载,增强了梁的变形能力,梁两端靠近支座处出现了特有的低应力区.分析结果有力地验证了斜腹杆体外预应力加固方法的有效性,为技术应用提供了参考.%By using finite element software ABAQUS,the nonlinear simulation of an orginal non-consolidated beam and 18 pieces of cable-consolidated beams were performed.Compared to the original beam,a small apposite arch will happen to the cable-beam without external prestress,and when a utilized load is applied to the beam,the phenomenon of internal force redistribution in the stressed system of the cabletilted belly rod-beam combination will be remarkable under the action of the external prestress,so that the stress distribution pattern on the cross-section of the concrete beam will alter,the cracking load and limiting load on the beam will increase,the deformation ability of the beam will be enhanced,and a characteristic low stress zone will take place near to the support at two ends of the beam.The validity of the method for consolidation of beam with external prestress of tilted belly-rods is vigorously verified by the analysis result,providing a reference for its application in engineering.
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