深基坑支撑体系可靠度计算研究

Reliability calculation for deep foundation pit support system

根据钢筋混凝土偏心受压构件的设计理论,建立了深基坑内部支撑的功能函数.考察各杆件的受力情况,忽略其中受力较小的杆件,运用几何法计算剩余内部支撑杆件可靠度.同时把整个支撑体系看成是具有串联子系统的串联系统,并对其进行体系可靠度计算.结果表明,用体系可靠度来反映基坑支撑的稳定性较为合理,为基坑支撑的可靠度研究提供了一种更有效的方法.

Based on the design theory for eccentrically compressed reinforced concrete members, a function is established for the internal support of deep foundation pits. By examination of the stress state of each rod and with negligence of the rods in low stress state, the geometry method is applied to calculation of the reliability of residual internal support rods. Meanwhile, the whole support system is taken as a series system consisting of various subsystems, and the reliability of the system is calculated. The results show that it is reasonable to use the system reliability to reflect the stability of foundation pit supports. The present study provides an effective method for research of the reliability of foundation pit supports.