考虑施工误差影响的RC框架结构可靠性分析

摘要

In order to analyze the influence of construction errors on the reliability of the Reinforced Concrete frame structure,based on the on-site measurement of one real RC frame engineering,the statistical distribution of the construction error,such as the beam column section size,the thickness of protection layer,stirrup spacing and concrete compressive strength et al.,was obtained.Based on the basic theory of structural reliability and the bearing capacity limit state equation,the reliability index of the typical frame beam and frame column in the real engineering was calculated by means of the checking point method.The influence of each construction error on the component reliability index and reliability grading of reinforced concrete frame structure was also analyzed,and the parameters sensitivity of the RC frame structure reliability was discovered.The construction errors have unnegligible influence on the reliability of RC frame members.The results are conductive to the control of critical parameters and its error in the design,construction and monitoring of real engineering.%为分析施工误差对RC框架结构可靠性的影响,对某钢筋混凝土框架结构工程进行现场测量,获得了梁柱截面尺寸、保护层厚度、箍筋间距和混凝土抗压强度等施工误差的统计分布规律.基于工程结构可靠度的基本理论和承载能力极限状态方程,采用验算点法计算了实际工程中典型的框架梁和框架柱的可靠指标,并详细分析了各施工误差对构件可靠指标和结构可靠性分级的影响,以及影响钢筋混凝土结构框架结构可靠度的参数敏感性.分析结果表明,施工误差对结构构件的可靠性存在不可忽视的影响.本文研究结果有助于工程设计、施工和监管过程中把握施工误差中需严格控制的重点参数和偏差范围.