桥梁施工临时结构体系可靠性评估方法

System Reliability Assessment Method for Temporary Structure in Bridge Construction Stage

摘要:

建立一种基于体系可靠度分析的临时结构状态评估方法.采用有限元分析和串并联模型相结合的方法判定临时结构的失效模式；对施工中临时结构的抗力、荷载、人因差错等取值进行探讨，提出了适用于临时结构的荷载、抗力和人因差错等可靠度模型；考虑风载和人因差错等对临时结构体系可靠度的影响，分别在构件和体系两个层面上对临时结构进行可靠性评估.最后采用体系可靠度方法对一三角挂篮的可靠性进行分析.结果表明：采用体系可靠度的方法对临时结构进行性能评估，不仅能够较好地解决当前设计中抗力和荷载不确定性问题，还能够保证结构具有一致的可靠度.

Abstract:

Condition assessment method for temporary structure is established based on system reliability analysis method. Failure models of temporary structures are established by the combined method with finite element analysis and series parallel model. Values of resistances, loads, and human errors of temporary structure in construction stage are discussed, and reasonable reliability models are proposed. Effects of wind loads and human errors on the temporary structure are considered, and component level and system level reliability assessment are analyzed respectively. Finally, performance of a triangle traveler is analyzed with the system reliability method. Results show that, using system reliability analysis method for temporary assessment can not only solve the uncertainties of resistance and load well, but also ensure the whole structure to have the same reliability.