PROBABILISTIC RELIABILITY ANALYSIS OF A BENDING CLT ROOF SLAB BASED ON DEFLECTION CRITERION
Abstract
Introduction: Cross-laminated timber structural elements are being actively introduced into the construction practice of residential and public buildings. A special factor in the design of CLT structures is the principles of ensuring their reliability, since a large amount of statistical data on the safety level of such structures has not yet been accumulated due to their relative novelty. Objective of the study is to develop an algorithm for probabilistic analysis of a bending CLT roof slab over a given service life based on the deflection criterion (linear displacements). Methods: The reliability indicator of a CLT roof slab is taken as the probability of failure-free operation, which is estimated by frequency based on random variable generation using the Monte Carlo method, employing an adopted mathematical model of the limit state. The numerical approach to reliability assessment, based on an analytical expression of the limit state, is the most effective approach due to the simplicity of algorithm implementation and reliable results when using various types of random variables. Results: An algorithm has been developed to evaluate the probability of failure-free operation of a CLT roof slab based on the deflection criterion when designing the panel for a design service life. Probabilistic analysis allows selecting the most efficient structural solution for a CLT roof slab for a given reliability index β. The influence of lamella thickness tolerance factors of the CLT roof slab on reliability (probability of failure-free operation) has been established.