钢筋混凝土结构设计

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　　DESIGN OF REINFORCED CONCRETE STRUCTURES
　　1. BASIC CONCERPTS AND CHARACERACTERISTICS OF REINFORCED CONCRETE
　　Plain concrete is formed from hardened mixture of cement, water , fine aggregate , coarse aggregate (crushed stone or gravel ) , air and often other admixtures . The plastic mix is placed and consolidated in the formwork, then cured to accelerate of the chemical hydration of hen cement mix and results in a hardened concrete. It is generally known that concrete has high compressive strength and low resistance to tension. Its tensile strength is approximately one-tenth of its compressive strength. Consequently, tensile reinforcement in the tension zone has to be provided to supplement the tensile strength of the reinforced concrete section.
　　钢筋混凝土结构设计
　　一、钢筋混凝土基本概念和特点
　　混凝土是指由水泥胶凝的水、细致聚合体、粗聚合物（碎石或沙砾）、空气、以及其他混合物的坚硬混合物。这种塑体在制作过程中，加水的水泥并混合然后晒干最终成为坚硬的混凝土。通常我们都知道混凝土有高抗压低抗拉的受力特性。其抗拉强度大概抗压强度的十分之一。所以，为了增加混凝土截面的抗拉强度必须增加受拉区间的受拉钢筋。