论文部分内容阅读
混凝土板开裂的最主要原因是混凝土的于缩,它使混凝土的尺寸缩短,而基底与混凝土间的摩擦限制了混凝土的缩短,结果混凝土中产生拉应力并随着缩短而逐渐增大,导致混凝土板开裂。当楼板与其相接触的结构构件不能独立的自由收缩时,也会开裂。板的胀缩可能与其它构件不同,当一定程度的胀缩受到约束时,也会造成混凝土板的开裂。地面板的翘曲也会导致开裂。当地面板上部的收缩大于下部时,边缘向上翘曲而失去支承,加之其它荷载,板上部受拉过大而导致开裂。施工时留出适当的接缝能达到控制开裂的目的。混凝土中的接缝一般有分隔缝、控制缝、施工缝三种。分隔缝亦称伸缩缝,可使混凝土板在水平和竖直两个方向上自由地移动,它不需要任何连接就能把混凝土板面和柱、墙、基
The main reason for the cracking of concrete slabs is the shrinkage of the concrete. It reduces the size of the concrete, and the friction between the substrate and the concrete limits the shortening of the concrete. As a result, tensile stress is generated in the concrete and gradually increases with the shortening, resulting in concrete. Cracked board. When the structural members in contact with the floor cannot be freely contracted independently, they will also crack. The expansion and contraction of the plate may be different from other components, and when a certain degree of expansion and contraction is constrained, cracking of the concrete plate may also be caused. Warping of the floor panel can also cause cracking. When the contraction of the upper part of the local panel is greater than the lower part, the edge warps upwards and loses the support. In combination with other loads, the upper part of the panel is pulled too large and cracking occurs. Appropriate joints during construction can be used to control cracking. Joints in concrete are generally divided into three types: separation joints, control joints and construction joints. Separation joints, also known as expansion joints, allow the concrete slab to move freely in both horizontal and vertical directions. It does not require any connection to place concrete slabs and columns, walls, and foundations.