钢纤维混凝土T梁抗裂性能分析-建筑与土木工程专业论文.docxVIP

Master Dissertation of Suzhou University of Science and Technology Analysis of SFRC T-Beam Crack Resistance Performance Master Candidate: Li Ning Supervisor: Sun Min Major: Architecture and Civil Engineering Research Area: Bridge Health Monitoring and Seismic Suzhou University of Science and Technology School of Civil Engineering June,2015 摘 摘 要 摘 要 钢纤维混凝土（Steel Fiber Reinforced Concrete，简称 SFRC）是在混凝土中 掺入一定体积率的钢纤维组成的材料，以改善混凝土材料的延性和耐久性。钢纤维的 掺入，显著改善了混凝土的性能，与普通混凝土梁的变形与破坏形态等方面有较大区 别。本文针对钢纤维混凝土 T 梁进行了力学试验和研究分析，为钢纤维具体应用于混 凝土 T 梁，提高 T 梁抗裂性能提供参考。 本文对 1 根钢筋混凝土 T 形梁和 4 根钢纤维混凝土梁 T 形梁进行了试验。在试验 的过程中，具体考察了梁体裂缝的开展与延伸情况，同时测量了挠度以及腹板混凝土 的应力变化情况，记录了其开裂荷载和极限承载力。根据实测数据，分析了在不同钢 纤维掺入率以及钢纤维替代腹板箍筋的情况下，梁的荷载挠度关系、裂缝分布特征， 以及腹板混凝土应力变化情况。结果表明，一定范围内，随着钢纤维掺入率的增大， 承载能力得到提升；钢纤维的掺入能够显著改善 T 梁腹板处的裂缝问题；增加钢纤维 掺入率能够部分取代剪跨段和支座处的钢筋，但不能完全取代箍筋。 本次试验采用非线性有限元软件 ANSYS 模拟，在模型参数取值、加载方法及收敛 准则等方面做了大量试算，以期达到较好的模拟效果。结果表明，计算所得的荷载- 挠度曲线、弥散裂缝分布、开裂荷载和极限荷载等与试验结果吻合较好，证明了采用 非线性有限元软件 ANSYS 模拟钢纤维混凝土梁是可行的。 关键词：钢纤维混凝土，抗裂性能分析，非线性有限元，ANSYS I Abs Abstract II II Abstract Steel Fiber Reinforced Concrete (SFRC) is the material mixed with a certain volume ratio of Steel Fiber in the concrete，which has better ductility and durability. Steel fibers significantly improve the performance of concrete, and make big difference to the deformation and failure pattern of common concrete beam. In this paper, we did the study of steel fiber reinforced concrete beams, for modifying the cracking of concrete beam. In this paper, a reinforced concrete T-beam and four concrete T-beams with steel fibers are experimented .In the process of experiments, we specifically examined the concrete crack development and extension .At the same time, The changes of the deflection and the stress of web plate concrete, and the cracking load and ultimate bearing capacity were measured. According to the measured data, we analyzed the relationship of beam’s load and deflection, the crack distribution characteristics and web plate concrete stress changes with different