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我国现行《钢筋混凝土结构设计规范》(TJ10—74)计算构件在荷载长期作用下的变形(长期变形) 时,采用了刚度降低系数(或称变形增大系数) θ法;新修订的《混凝土结构设计规范》(第二次送审稿)基本上沿用了上述方法,仍取刚度降低系数θ与压、拉筋配筋率的相对值ρ~′/ρ为线性关系(预应力混凝土结构忽略压筋影响,取θ为恒值)。该计算方法比较简单,便于在设计中应用。但是,进一步的研究表明,如将上述规范的计算公式稍加修正,尚可扩大其适用范围。
China’s current “Code for Design of Reinforced Concrete Structures” (TJ 10-74) uses the stiffness reduction factor (or deformation increase factor) θ method to calculate the deformation (long-term deformation) of components under long-term load; the newly revised “Concrete The Structural Design Specification (the second review draft) basically follows the above method, and still takes the linear relationship between the stiffness reduction factor θ and the relative value of the reinforcement ratios of pressure and lacing ρ~’/ρ (prestressed concrete structures are ignored Pressure bar influence, take θ as a constant value). The calculation method is relatively simple and easy to use in design. However, further research shows that if the above formula is slightly modified, its scope of application can be expanded.