论文部分内容阅读
针对现行部分组合钢-混凝土构件中系杆易于脱落的问题,提出两种系杆改进形式,设计了4根梁试件进行试验研究,考察纯弯与剪弯受力状态下梁的性能表现。试验结果表明:X型与C型系杆均能较好地拉结受压翼缘,受压翼缘在弹性段内没有屈曲;采用了这两种系杆的试件承载能力基本一致;与C型系杆相比,X型系杆对混凝土的约束作用更强,混凝土整体性更好,并且能抑制斜裂缝;纯弯试件与剪弯试件破坏部位的现象主要以混凝土的压溃、受压翼缘屈曲为主,剪弯试件破坏部位还观察到了受拉翼缘的开裂。此外,按照边缘屈服和全截面塑性假定计算得到的试件抗弯承载力小于试验实测值,用其来估计类似截面的承载能力是可行的。
In order to solve the problem that the tie bars of some composite steel-concrete components are easy to fall off, two improved forms of tie bars are proposed. Four beam specimens are designed and tested to investigate the behavior of beams under pure bending and shear bending. The test results show that both the X-type and C-type tie rods can pull the compression flange well, and the compression flange has no buckling in the elastic section. The bearing capacity of the two tie rods is basically the same. Compared with C-type tie rod, X-type tie rod has more restraining effect on concrete, better concrete integrity and can inhibit diagonal cracks. The phenomenon of the damage of pure bending specimen and shear bending specimen is dominated by the collapse of concrete , The buckling of the compression flange is the main part, and the cracking of the tensile flange is also observed in the damaged part of the shear bending specimen. In addition, the flexural capacity of the specimens calculated according to the yield edge and the plasticity of the full cross-section is less than the experimental ones. It is feasible to estimate the bearing capacity of the similar cross-section.