钢筋混凝土梁—板结构可靠度计算方法研究

Structural Reliability of PRC Beams Composite with a CIP Slab

本文主要针对预制钢筋混凝土梁—现浇板复合结构的结构可靠度进行分析,采用美国混凝土学会ACI-318对一个简支梁—板结构进行了配筋设计与验算,并根据极限状态方程,分别采用一阶二次矩法及Rackwitz-Fiessler法计算了该结构的结构可靠度指标,最后使用蒙特卡洛模拟对计算结果进行了验证。计算结果表明,上述三种方法均能有效的计算结构可靠度指标,并且很好地描述该结构的可靠性能;该结构的性能主要由抗弯能力控制,在本结构中箍筋主要起到抵抗水平剪力及防止混凝土开裂的作用。

In this article,the structural reliability analysis for the precast reinforced concrete beams composite with a cast-inplace slab was done.According to the ACI-318,longitudinal bars and shear stirrups were designed and checked.Besides,the limit state function was obtained.In accordance with the limit state function,reliability indexes due to flexural and shear f ailure were calculated by first-order,second-moment method and Rackwitz-Fiessler Procedure.Finally,a Monte Carlo simulation was carried out to check results of both previous methods.In a word,three methods applied in this paper can effectively obtain the reliability index and describe the structural reliability.The composite beam-slab system will likely fail due to the bending moment more than the vertical shear,which means the moment capacity will control the performance of the structure during its life time.,which means that the shear reinforcement in this structure are mainly used to resist the horizontal shear and the cracks.