钢筋混凝土框格单元结构受力性能影响因素分析

Influence factor analysis of load-bearing performance of fundamental reinforced concrete frame

为研究填充块材和外围构件对钢筋混凝土框格单元结构受力性能的影响,对4个框格单元和2个空框格结构进行1/2比例模型加载试验。结果表明,开裂前填充砌体与钢筋混凝土框格粘着为一体共同抵抗外力,开裂后结构转化为砌体压杆抗力机制。外围构件弯曲刚度对结构抗裂能力及极限承载能力均有显著影响。提高填充块材抗压强度时结构极限承载能力显著提高。当填充块材抗压强度及弹性模量较低时,钢筋混凝土框格单元结构的变形能力很好。

To investigate the influences of concrete masonry units and frame members on the load-bearing performance of the fundamental reinforced concrete frame in multi-ribbed walls, four fundamental reinforced concrete frames and two corresponding frames without infill were tested. It is revealed that at a low load level, the fundamental reinforced concrete frames act as a monolithic load-resisting system, After the infill partially separate from the bounding frame, the load-resisting mechanism of masonry compressive struts is formed. Enhancing the flexible stiffness of the frame members, both the crack-resisting capacity and ultimate load-resisting capacity are improved. With the increase of the compressive strength of concrete masonry units, the ultimate load-resisting capacity of structures becomes higher. When the compressive strength and elastic module of concrete masonry units is lower, the deformation capacity of the fundamental reinforced concrete frame becomes better.