分布式连接全装配RC楼盖竖向承载力与变形分析

ANALYSIS OF THE VERTICAL STRENGTH AND DEFLECTION OF DISCRETELY CONNECTED PRECAST RC FLOOR SYSTEMS

在分布式连接新型全装配RC楼盖中,板与板之间通过连接件连接实现横板向传力。为研究新型楼盖竖向承载力计算方法,进行了新型楼盖在竖向荷载作用下的内力与变形分析。结果表明:基于正交各向异性弹性薄板小挠度理论和单三角级数法得到四边简支新型楼盖在竖向均布荷载作用下的弯矩与挠度表达式,提出了新型楼盖横板向刚度计算方法,并通过与试验和有限元结果对比,验证了所提方法的准确性;新型楼盖的挠度在两个方向呈空间抛物面分布,表明新型楼盖具有良好横板向传力性能;板缝连接可有效传递板内弯矩,但正交的两个方向弯矩传递效果存在差异,表现为顺板向弯矩的传递效果优于横板向。研究成果可为分布式连接全装配RC楼盖的研究和应用提供参考。

In discretely connected precast RC floor/diaphragms (DCNPD), slab joints are connected by connectors to transfer internal force. An analysis program of internal force and deflection under vertical load was conducted to accureately determine the vertical strength of DCNPDs. The moment and deflection eqations of a DCNPD simply supported on four sides under uniformly distributed load are derived according to the small deflection theory of elastic thin perpendicular heterogeneous plates and are solved with trigonometric series. A model for estimating the bending stiffness of a DCNPD in the transverse direction is proposed and validated by comparing with finite element solutions and experimental results. The moment and deflection distributions of a DCNPD are ideally spatial parabolical, indicating that the DCNPD has excellent bidirectional mechanical behavior. The moment can be effectively transferred by the slab joints, especially in the slab laying direction rather than the orthogonal direction.