Reinforced concrete (RC) slab structures are common in civil engineering, yet they are susceptible to creep under sustained loading. The creep effects significantly impact the biaxial stress distribution of reinforced concrete slabs. Existing creep analysis and computation methods for these structures have some limitations. Therefore, exploring an appropriate two-dimensional creep analysis approach is essential. The two-dimensional stress creep properties of concrete and Poisson's ratio of creep are used to create a two-dimensional creep transformation matrix. A two-dimensional creep calculation formula using the age-adjusted effective modulus method is established to improve reinforced concrete slab creep analysis. Based on the stress states and geometrical characteristics of RC slabs, two-dimensional creep calculation methods are suitable for plain concrete slabs, reinforced concrete slabs with longitudinal reinforcement, and reinforced concrete slabs with both longitudinal and transverse reinforcement. Deflection rises due to the creep effect in the plain concrete slab, although the longitudinal and transverse stresses increase relatively slightly. The effect of the longitudinal reinforcement on deflection in RC slabs is negligible; as the longitudinal stress in concrete decreases, reinforcement stress rises with obvious stress redistribution; the lateral stress decreases compared with plain concrete but rises. The transverse reinforcement of RC slab affects concrete deflection and transverse stress twice as much as longitudinal reinforcement. Prolonged loading considerably redistributes longitudinal and transverse stresses in the reinforced concrete slab's concrete and steel reinforcing.

中文翻译：

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RC 板结构的二维蠕变效应研究


钢筋混凝土 （RC） 板结构在土木工程中很常见，但在持续载荷下容易发生蠕变。蠕变效应显著影响钢筋混凝土板的双轴应力分布。这些结构的现有蠕变分析和计算方法有一些局限性。因此，探索合适的二维蠕变分析方法至关重要。混凝土的二维应力蠕变属性和泊松蠕变比用于创建二维蠕变变换矩阵。采用年龄调整有效模量法建立了二维徐变计算公式，以改进钢筋混凝土板的徐变分析。根据 RC 板的应力状态和几何特性，二维徐变计算方法适用于普通混凝土板、纵向钢筋混凝土板以及纵向和横向钢筋钢筋混凝土板。由于普通混凝土板中的蠕变效应，挠度增加，尽管纵向应力和横向应力相对略有增加。纵向钢筋对 RC 板挠度的影响可以忽略不计;随着混凝土中纵向应力的减小，钢筋应力上升，应力重新分布明显;与普通混凝土相比，侧应力减小但上升。RC 板的横向钢筋对混凝土挠度和横向应力的影响是纵向钢筋的两倍。长时间的荷载会大大重新分配钢筋混凝土板的混凝土和钢筋中的纵向和横向应力。