For reinforced concrete frame structures

the variability of construction quality is one of the important reasons for the uncertainty of system reliability.In this paper

based on the analyzing method of incremental variability

the finite element software ANSYS was used to calculate the seismic reliability of reinforced concrete frame structures

considering the variability of construction quality and the failure correlation of each floor.The sensitivity of inter-story drift angle and the influence of the variability of construction quality on the system reliability were investigated quantitatively.Based on the reliability theory

the recommended threshold limits of construction error of reinforced concrete frame structures were obtained.The results show that the randomness in material strength and geometric size of structures has a great influence on the interstory drift angle

especially the compressive strength of concrete.The system reliability increases with the mean value of concrete compressive strength and decreases with the increase of standard deviation.The mean variability of the section size and the stirrup spacing has an obvious effect on the system reliability

followed by the variation of the standard deviation of the cover thickness of reinforcements.The recommended threshold limits of construction error are（-6

12）mm for the deviation of the height of beam-column sections

（-26

26）mm for the deviation of stirrup spacing

and（-5.5

5.5）mm for the deviation of the cover thickness of reinforcements

respectively.