论文部分内容阅读
一、裂缝机理通过设在混凝土截面中央的钢筋施加拉力的轴心受拉试验表明:用光面钢筋配筋的试件,在钢筋拉应力不大时就发生滑动(图1中试件C-D-1,C-D-2);而用变形钢筋的试件,钢筋周围混凝土的拉伸变形会随钢筋应力增加而不断增大(图1中试件c-A-1,C-B-1,C-C-1等)。这是因为变形钢筋表面的肋条对混凝土的锚固作用使变形钢筋与周围混凝土之间的粘着力不会丧失。
First, the crack mechanism through the axial center of the concrete cross-section of the tensile force applied by the axial tension test shows that: with steel bars with steel bar specimens, the tensile stress occurs when the reinforcement is not large (Figure 1 in the CD- 1, CD-2); and with deformed steel specimens, the tensile deformation of the concrete surrounding the reinforcement will increase with the increase of the stress of the reinforcement (samples cA-1, CB-1, CC-1, etc. in Figure 1). . This is because the anchoring effect of the ribs on the surface of the deformed steel bar to the concrete does not lose the adhesion between the deformed bar and the surrounding concrete.