普通冷拔低碳钢丝预应力混凝土圆孔板是当前我国生产中量大面广的一种构件型式。由于作为预应力筋的普通冷拔低碳钢丝塑性较差,所以一般构件破坏特征表现为:在荷载作用下,构件截面受拉区混凝土一旦出现裂缝,如果荷载继续增加,受拉钢丝的应力很快达到极限强度,塑性变形迅速发展,受压区混凝土随之也达到强度极限,钢丝被拉断,构件遭破坏,构件在破坏前呈现裂缝与变形的预兆不明 Ordinary cold-drawing low carbon steel prestressed concrete round hole plate is a kind of component type widely used in China’s production. Due to the poor plasticity of ordinary cold drawn low-carbon steel wire as a prestressed tendon, the general component failure characteristics are as follows: Under the action of the load, if there is crack in the concrete of the structural section tension zone, if the load continues to increase, the stress of the tensioned wire is very high. As soon as the ultimate strength is reached, the plastic deformation develops rapidly, and the concrete in the compression zone subsequently reaches the strength limit, the steel wire is broken, the component is destroyed, and the omnes of the component showing cracks and deformation before the failure is unknown.