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钢筋混凝土以其良好的受力性能和较好的经济性,广泛地应用于各种桥梁工程之中。钢筋混凝土受压构件具有较好的力学性能,但因混凝土的抗拉强度较低,通常情况下,钢筋混凝土结构通常处于带裂缝工作状态。一般设计计算时,常常忽略受拉区的混凝土应力得到相对安全的计算值。但是在荷载试验和科学研究中,这种假设下得到的应力值并不合适。本文基于应力分布对矩形开裂构件应力进行了理论推导,并结合算例计算了具体构件应力值。
Reinforced concrete is widely used in various bridge projects due to its good stress performance and economy. Reinforced concrete compression member has good mechanical properties, but due to the low tensile strength of concrete, usually, the reinforced concrete structure is usually in the working state with cracks. In general design calculations, the relatively safe calculation of the concrete stress in the tension zone is often overlooked. However, in load tests and scientific studies, the stress values obtained under this assumption are not suitable. In this paper, the stress distribution of rectangular cracked members is deduced theoretically based on the stress distribution. The stress values of concrete members are calculated with examples.