密肋复合墙体等效斜压杆模型

EQUIVALENT OBLIQUE COMPRESSION BAR MODEL OF MULTI-RIBBED COMPOSITE WALL

结合课题组前期的研究成果,对一种新型结构的主要受力构件——密肋复合墙体的弹性简化计算模型进行研究。在密肋复合墙体框格单元试验的基础上,探讨框架梁柱刚度、填充材料力学性能等主要因素对密肋复合墙体框格单元受力性能及破坏形式的影响;将墙体中的填充块对整体墙体的作用等效为铰接于钢筋混凝土框架的对角斜压杆,并分析、构造出等效斜压杆宽度的计算公式;在此基础上,建立适用于密肋复合墙体的刚架-斜压杆简化计算模型并推导出刚架-斜压杆弹性抗侧刚度公式。理论分析表明:刚架-斜压杆能够较好地反映密肋复合墙体的真实受力性能,是一种合理的简化计算模型。

A multi-ribbed composite wall is the main bearing member of a new structural system——multi-ribbed slab structure. According to the results of previous studying, the elastic simplified mathematical model of the multi-ribbed composite wall is studied. Based on the experimental research on the frame grid elements of the wall. It is discussed the influence of the main factors on the mechanical behaviors and failure modes of the frame grid elements, such as the rigidity of beams and columns in frames, the mechanical properties of filling materials and others. The oblique compression bar which diagonally articulates with reinforced concrete frame is adopted to simulate the action of filler block on the whole wall, and that the width formula of the equivalent oblique compression bar is obtained by analyzing and constructing. On this basis the rigid frame-oblique compression bar＇s simplified mathematical model which is suitable for the multi-ribbed composite wall is established. Furthermore the elastic lateral stiffness formula of the rigid frame-oblique compression bar is deduced. Theoretical analysis shows that the rigid frame-oblique compression bar can better reflect the real mechanical behavior of the multi-ribbed composite wall and is a kind of reasonable simplified mathematical model.