钢筋混凝土楼板连续倒塌的一种简化模拟方法

发布时间：2018-08-08 16:30

【摘要】：楼板作为框架结构的重要组成构件,显著影响结构抗连续倒塌性能。该文提出了一种新的钢筋混凝土楼板简化数值模拟方法,把楼板沿两个平面方向离散形成一个梁网,每个方向上的网络线采用纤维梁单元来模拟钢筋和混凝土的组合受力行为。其中,采用T/L形截面的纤维梁单元模拟楼板边缘区域的梁板交界节点,以考虑楼板对梁在连续倒塌小变形下弯曲受力以及破坏形态的影响;采用矩形截面的纤维梁单元模拟楼板的中心区域,以考虑楼板在大变形下发挥的薄膜拉力。采用这种方法不仅解决了以往用壳单元模拟刚度过高的问题,还大大提高了整体结构的运算效率。该文对T/L形截面异形柱和单双向楼板试验分别进行模拟,结果表明该简化方法能够高效准确的模拟钢筋混凝土楼板的大变形力学行为,为整体结构的抗连续倒塌分析提供了有力的工具。
[Abstract]:Floor, as an important component of frame structure, has a significant impact on the continuous collapse resistance of the structure. In this paper, a new simplified numerical simulation method for reinforced concrete slabs is presented, in which the slabs are discretized along two plane directions to form a beam net, and the fiber beam elements are used in each direction to simulate the combined behavior of steel bar and concrete. The fiber-beam element with T / L section is used to simulate the beam-slab junction in the edge of the floor to consider the influence of the floor on the bending force and the failure pattern of the beam under the continuous collapse and small deformation. The fiber beam element with rectangular section is used to simulate the central region of floor slab to consider the thin film tensile force of floor slab under large deformation. This method not only solves the problem that the shell element is used to simulate the high stiffness, but also improves the efficiency of the whole structure. In this paper, the experimental results of T / L section special-shaped columns and single bidirectional slabs show that the simplified method can effectively and accurately simulate the large deformation mechanical behavior of reinforced concrete slabs. It provides a powerful tool for the continuous collapse analysis of the whole structure.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;清华大学土木工程安全与耐久教育部重点实验室;
【基金】：国家自然科学基金项目(51208011) 北京市教委科研计划项目(KM201310005025) 国家博士后科学基金项目(2012M510301) 北京市博士后科研项目(2012ZZ-13)
【分类号】：TU375.2;TU312.3

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