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为研究空间钢构架混凝土简支深梁的静力性能,进行了4根空间钢构架混凝土深梁试件和作为对比试件的2根普通钢筋混凝土深梁在竖向对称集中荷载作用下的模型静载试验。试验参数为跨高比、配筋方式等。试验结果表明,与相同条件(除配筋方式外)的普通钢筋混凝土深梁相比,配置空间钢构架的混凝土深梁不仅刚度增大,而且其受剪承载力和变形能力也有较大幅度的提高,合理配置空间钢构架可改善混凝土深梁的延性。除配置水平和竖向分布钢筋外,沿主拉应力迹线方向配置斜向分布钢筋,或沿主压应力迹线方向设置斜向暗梁等措施可进一步提高空间钢构架混凝土深梁的受剪承载力。结合试验结果及其分析,给出了空间钢构架混凝土深梁的设计建议和构造要求,包括深梁内空间钢构架的配置范围、材料要求、混凝土保护层厚度、承重空间钢构架设计方法以及深梁内斜向分布钢筋、斜向暗梁的构造要求等。
In order to study the static behavior of steel reinforced concrete simply supported deep beams, four steel reinforced concrete deep-beam specimens and two ordinary reinforced concrete deep beams under vertical symmetrical concentrated loads Static load test. Test parameters for the cross-ratio, such as reinforcement. The test results show that compared with common reinforced concrete deep beams under the same conditions (except for the reinforcement method), the concrete deep beams provided with space steel frames not only have increased stiffness but also have greater shear capacity and deformation capacity Increasing and rational allocation of space steel frame can improve the ductility of deep concrete beams. In addition to the configuration of horizontal and vertical distribution of steel, the main tensile stress along the direction of the distribution of diagonal distribution of reinforcement, or along the direction of the main compressive stress set oblique oblique beams and other measures to further enhance the space steel reinforced concrete beams deep shear Carrying capacity. According to the test results and analysis, the design and construction requirements of the space steel frame concrete deep beam are given, including the configuration range, material requirements, thickness of concrete cover, design method of steel frame in load-bearing space and deep Beam diagonal distribution of steel, slant hidden beam structure requirements.