ANALYTICAL ASSESSMENT OF PONDERABILITY OF CONSTRUCTIONAL PARAMETERS ON RELIABILITY OF COLUMN CONNECTIONS IN FRAME BUILDINGS

The paper studies the effect of variability in the structural parameters of the joints of columns of frame buildings using tub welding on the reliability of the connection. The main design positions are given and the parameters that determine the bearing capacity and reliability of the joint are identified. We obtained the coefficients of ponderability parameters in the calculation of reliability. An assessment of the reliability of the joint with the correction of the values of the construction parameters specified by the characteristics of the normal distribution was carried out. To analyze the ponderability of the parameters, one of the probabilistic calculation methods was used - the linearization method of the original function. The main objective of the study is to identify the most significant structural parameters of the joints for managing reliability, assessing the impact on reliability of changes in the values of the probabilistic characteristics of the calculated strength and geometric parameters of the junction of columns. The study found that not all parameters of the joints equally affect the probability of structural failure and, ultimately, the reliability of the entire structure. The greatest weight of all the construction parameters in determining the reliability of the joint has the strength of the concrete monolithing. The calculation of the reliability of the joint on the design values of the probability characteristics of parameters without taking into account the load variability showed that the reliability index exceeded the recommended standard value. During the assessment of the impact of the correction of the probability characteristics of the construction parameters, it was found that the reduction in the probabilistic mean of the column cross section parameters has a significant effect on the reliability of the joint, which requires strict consideration when assessing the technical condition of the frame building.

failure probability, reliability, linearization, column connections, ponderability of parameters, Laplace integral