Experimental and numerical validation of flexural behaviour of multi-scale prefabricated Industrialised Building System (IBS) sub-frame

Abstract

The paper describes the approach to develop the 1/5 scaled physical model and its applicability is validated against full scale model. Non-dimensional modelling methods using Buckingham Pi Theorem and Similitude Theory are explained and material properties for concrete, reinforcement, steel links, and beam-column connections are provided. The comparison between the results of experimental flexural test and Non-Linear Finite Element Analysis (NLFEA) of 1/5 scaled model and prototype of prefabricated IBS are discussed and presented. This paper is to verify the procedures and results of flexural test for 1/5 scaled model of prefabricated IBS in comparison to the prototype. The IBS components were setup and tested under two-points monotonic vertical loading in Universiti Teknologi Malaysia Structure Laboratory. Three Linear Variable Displacement Transducers (LVDTs) and two strain gauges were instrumented in the small-scaled model to record deflections and strains. Both small-scaled model and prototype were analysed by Abaqus FEA software. Elastic range for both small scaled model and prototype are determined by scaled factor of 5.0, and proven to be accurate by both experimental test and NLFEA with ultimate capacity of 13 kN load and 10.9 mm vertical deflection. Since the similitude theory only applicable until elastic limit, hence the structural performance in nonlinear state is evaluated in concrete crack patterns and beam-column connection deformations are presented graphically in this paper. Load-displacement with maximum 12.9 mm deflection, 35.64 N/mm2 ultimate crushing stresses at concrete and beam-column connection with minimum yield strength of 222.6 N/mm2 are presented. This paper concluded that the procedures and results of flexural test for 1/5 scaled model of prefabricated IBS is valid in comparison to the prototype.