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钢纤维混凝土密肋复合楼盖将材料的复合与结构的复合有机的结合,具有良好的受力及保温隔热等性能。通过利用非线性有限元方法,对钢纤维密肋复合楼盖结构体系的受力性能进行了全过程分析,并通过改变钢纤维含量进行参数讨论。建模过程中钢纤维的作用主要通过修改混凝土的本构关系及弹性模量等参数来体现,同时不考虑钢纤维与混凝土间的粘结与滑移。结果表明,添加钢纤维能明显减小结构的变形,提高结构的抗裂性能。在结构上部边缘处没有形成塑性铰线前,不同钢纤维含量下结构不同位置处应力分布规律基本相同,但当结构塑性铰线逐渐形成后由于内力重分布的影响,钢纤维含量对结构的应力分布影响较大。此外,钢纤维含量对结构裂缝的开展及分布规律影响不大,但由于钢纤维提高了混凝土的抗拉强度,所以对结构裂缝的分布范围有一定的影响。
Steel fiber reinforced concrete multi-ribbed compound floor composite materials and composite structure of organic combination, with good stress and thermal insulation and other properties. Through the use of nonlinear finite element method, the whole process of the mechanical properties of the steel fiber multi-ribbed composite floor structure was analyzed and the parameters were discussed by changing the steel fiber content. The role of steel fiber in the modeling process is mainly reflected by modifying the constitutive relations and elastic modulus parameters of concrete, without considering the bond and slip between steel fiber and concrete. The results show that the addition of steel fiber can significantly reduce the deformation of the structure and improve the crack resistance of the structure. Before the plastic hinge line was formed at the upper edge of the structure, the stress distribution at different locations of the steel fiber content was basically the same. However, when the structural plastic hinge line was gradually formed, due to the influence of the internal force redistribution, the stress of the steel fiber content on the structure Distribution of greater impact. In addition, the content of steel fiber has little effect on the development and distribution of structural cracks, but due to the steel fiber increases the tensile strength of concrete, it has a certain impact on the distribution range of structural cracks.