钢筋钢纤维高强混凝土梁抗弯性能的试验研究

【作者】 林涛；

【导师】 黄承逵；

【作者基本信息】 大连理工大学 ， 结构工程， 2002， 硕士

【摘要】 钢纤维高强混凝土是综合了钢纤维混凝土和高强混凝土优点的一种新型材料，较普通混凝土具有改善构件的刚度和延性、提高抗裂度、耐久性等优点。针对修订《纲纤维混凝土设计与施工规程》，本文着重在钢纤维高强混凝土梁的抗弯结构性能方面进行了研究，做了如下工作： 1．对现有的普通钢纤维混凝土基本理论和计算方法进行阐述和总结，并针对钢纤维高强混凝土的特殊性提出适合它的计算理论。 2．研究影响钢纤维高强混凝土梁抗弯极限承载力的各种因素，并对其主要影响因素——纤维特征参数和高强混凝土的基体强度进行分析，建立适合钢纤维高强混凝土受弯构件承载力的计算公式。 3．研究影响钢纤维高强混凝土梁初裂荷载的各种因素，并着重分析纤维特征参数的改变及混凝土强度提高所产生的影响，提出适合钢纤维高强混凝土受弯构件初裂荷载的计算公式。 4．研究影响钢纤维高强混凝土梁在正常使用极限状态下裂缝宽度的各种因素，针对各个品种的钢纤维及高强混凝土修正原有钢筋钢纤维混凝土构件正常使用极限状态下裂缝宽度验算公式。 5．分析试验中构件变形现象，对钢筋钢纤维高强混凝土受弯构件的短期刚度进行分析，同时分析影响构件延性的各种因素，提出一种适合钢纤维高强混凝土梁曲率的计算公式。更多还原

【Abstract】 High-strength steel fiber reinforced concrete is a new type of material, bearing the virtues of both fiber concrete and high-strength concrete. Compared with common strength concrete, its stiffness, ductility, crack resistance ability, and durability is improved. Aiming to revise the Specification for Design and Construction of Steel Fiber Reinforced Concrete Structures, the flexural behavior of high-strength steel fiber reinforced concrete beams is investigated. The following work has been done:1 Basic theories and computational methods for existing common fiber concrete are expounded and summarized. Regarding the unique characteristics of high-strength steel fiber reinforced concrete, corresponding calculated theory is given.2 Variables that affect bending capacity of high-strength steel fiber reinforced concrete beams are discussed. Two main affected factors, characteristic parameters of fiber and base strength of high- strength concrete, are analyzed. The calculated formula for bending capacity of high-strength steel fiber reinforced concrete beams is put forward.3 Various factors affecting the initial strength are studied, mainly considering the effect of the change of fiber parameters and increase of concrete strength. The formula for calculating the load at the first crack in beams subjected to bending is given.4 Variables that affect the width of cracks in high-strength steel fiber reinforced concrete beams under normal service conditions are studied. Corresponding to different types of fiber and high-strength concrete, the previous formulas for calculating width of cracks in fiber reinforced concrete members are revised.5 The deformation and short-term stiffness of beams are analyzed. Meanwhile, factors affecting the ductility of members are investigated, and a formula is proposed to estimate curvature of high-strength steel fiber reinforced concrete beams.更多还原