钢筋网加固具有常见损伤的混凝土梁的有限元仿真-建筑与土木工程专业论文.docxVIP

摘 摘 要 在混凝土梁的加固方法中，钢筋网加固混凝土梁不论从所使用材 料性能与原结构的相似性，还是从加固的耐久性和方法的方便性等方 面来讲，均是一种有效的新型加固方法。通过试验和数值仿真分析研 究，认识其加固机理和加固效果，为推广使用该加固方法提供了技术 支持，有着重要的理论意义和实用价值。本文的主要工作和研究成果 如下： 1)分析了钢筋网加固钢筋的受力特点；在此基础上，对钢筋网 加固混凝土梁的工作机理进行了探讨，并阐述了典型混凝土梁的钢筋 网构造。 2)分析了混凝土梁受压损伤机理和混凝土梁受损过程中材料 的受力特点。探讨了不同的损伤计算模型，采用Willam．Warnke五参 数模型模拟混凝土梁材料，用理想弹塑性模型和线性强化模型模拟钢 筋网片材料，建立了合理的数值仿真模型。该模型能很好地对加固构 件进行数值仿真试验，再现其受力性能、追踪裂缝的开裂和发展以及 最终的破坏形态，对认识加固构件的加固机理及加固效果是行之有效 的方法之一。 3)阐述了新型钢筋网加固方法在工程中的应用，探讨了钢筋网 加固理论及其对工程的影响；分析了影响钢筋网加固的加固因素，在 此基础之上，提出了钢筋网的施工工艺及施工要求；研究了钢纤维在 钢筋网加固中的增强机理，并提出了钢筋网加固的改进方案。 关键词： 钢筋网加固，有限元分析，混凝土梁，损伤模型，数值仿 真，加固工艺 AB AB STRACT In Strengthening methods，steel mesh strengthening reinforced defective concrete beam iS proved to be a new effective reinforeed method not only by the similarity of material behavior to obj ects strengthened，but also its endurance and easy installing．The mechanics and effect of the new strengthening method with test and Finite Element Method had been observed，which iS supposed to offer a guide for technology and become valuable in theory and practice．In this article，the fields and aspects of investigation are as following 1)Stress analysis of the steel bar in steel mesh strengthening reinforeed concrete beam was performed．On the basis of the results，the mechanism of steel mesh strengthening reinforced concrete beam was investigated．Moreover,typical steel mesh structure was presented． 2)The concrete beam damage mechanism was researched and the damage computing model was analyzed．WiUam-Warnke five．parameter model simulating concrete beam，ideal elastic plastic model and linear strengthened model simulating steel mesh are used to establish the rational numerical simulation model．This model Can be fully used to carry out the numerical simulation test of strengthened members，to reconstruct the bearing process and properties and to trace the cracking occurrence and propagation of cracks and the final destructive morphology．Accordingly；it is one of the effective methods to recognize the st