钢筋混凝土四边固定板温度裂缝的形态特征

Morphological Characteristics of Temperature Cracks of Reinforced Concrete Slabs with Four Edges Clamped

从温度应力出发,分析了钢筋混凝土四边固定板温度裂缝的形成原因。基于"分布式"裂缝模型,采用有限元软件ANSYS建立了钢筋混凝土四边支撑板的有限元模型,并对钢筋混凝土楼板在温度、重力以及温度和重力共同作用下的裂缝分布进行了分析,得出了钢筋混凝土四边固定板温度裂缝的形态特征,即仅在温度作用下,钢筋混凝土四边固定板将在楼板中部出现平行于短边的周期性贯穿裂缝。而仅在重力荷载作用下,钢筋混凝土四边固定板的上表面将出现与板边平行的裂缝,下表面中心处将出现垂直于短边的水平裂缝及向板角方向发展的交叉斜裂缝。因此,可以根据裂缝的不同形态来判别裂缝的形成原因,为工程结构的加固和改造提供依据。

In this paper,started from temperature stress the forming reason of temperature cracks of reinforced concrete slabs with four edges clamped is analyzed.Based on distributed cracks model,the finite element software ANSYS is used to establish the finite element model of reinforced concrete slabs with four edges clamped.Then the cracks distribution under the load of temperature,gravity,temperature and gravity of reinforced concrete slabs is analyzed.At last,the morphological characteristics of reinforced concrete slabs with four edges clamped are concluded： the periodical through cracks paralleled to short-edges of slabs are appeared at the center.Under the gravity,the cracks paralleled to slab edges are appeared on the up surface of reinforced concrete slabs with four edges clamped;the horizontal cracks vertical to short edges and cross inclined cracks developing to slab edges are appeared at the center of down surface.So the forming reason of cracks can be distinguished according to the morphological characters of cracks,and evidence is provided to the engineering strengthening and retrofitting.