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我们知道钢筋混凝土是由钢筋和混凝土两种物理力学性能完全不同的材料组成。钢筋的抗拉和抗压能力都很强,混凝土的抗压能力很强,但抗拉能力却很弱。所以,大多数普通钢筋混凝土构件在正常使用情况下,受拉区出现裂缝,致使构件的刚度降低,变形增大。要限制构件的裂缝宽度和变形,将其控制在使用所允许的范围以内,就要适当加大构件的截面或提高混凝土的标号,这既多消耗了材料,
We know that reinforced concrete consists of two materials with completely different physical and mechanical properties of steel and concrete. The tensile strength and compressive strength of steel bars are very strong. Concrete has strong compressive strength, but its tensile strength is very weak. Therefore, most ordinary reinforced concrete members in the normal use of the situation, the tensile zone appears cracks, resulting in the reduction of the stiffness of the component, the deformation increases. To limit the crack width and deformation of components and control them within the allowable range of use, it is necessary to appropriately increase the cross section of the components or increase the number of concrete, which consumes more materials.