Abstract
Over the past decade, several types of composite slim floor constructions have been used in multi-storey buildings in Lithuania. In order to study the efficiency of composite beam application in steel-framed multi-storey buildings, Thorbeam (A1), Deltabeam (A2), slim floor beam (A3) and asymmetric slim floor beam (A4) were chosen and evaluated according to nine assessment criteria (beam cost (K1), initial preparation on site (K2), installation time (K3), complexity of installation technology (K4), labour costs (K5), fire resistance (K6), load bearing capacity (K7), beam versatility (K8), and availability of beams (K9)). First, the significance of the rating criteria was selected and the order of the ranking criteria was obtained (K1˃K7˃K3˃K6˃K4˃K5˃K2˃K8˃K9) by means of a survey questionnaire. Second, the beams were ranked according to the points given by the questionnaire respondents as follows: 160 points were given to A2, 144 points to A1, 129 points to A4, and 111 points to A3. Deltabeam is considered to be the most rational alternative of the four beams compared. Calculations done using the Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) analysis method revealed that composite beam A2 was the best slim floor structure alternative for an eight-storey high-rise commercial residential building frame, A1 ranked second, A4 ranked third, and A3 ranked fourth. In addition, the four composite beams were compared to a reinforced concrete beam (A5) according to three assessment criteria (beam cost including installation (C1), beam self-weight (C2) and fire resistance (C3)). Deltabeam was found to be efficient for use as a slim floor structure in a multi-story building due to having the lowest cost, including installation, and self-weight, and the highest fire resistance compared to other composite beams studied. Although Deltabeams are 1.4 times more expensive than reinforced concrete beams, including installation costs, they save about 2.5% of the building’s height compared to reinforced concrete beams.
Highlights
Architects, engineers and project managers face many challenges while implementing a building project from its conceptual sketch to the ultimate completion
The work presented in this paper aims to find out the efficiency of composite beam application in multi-storey building frames and the main ranking criteria that determine the choice of the composite beams examined
The literature review showed that the improved efficiency of a building frame with composite beams is related to the extended span range of the beams, flexible layouts of the space, increased spatial efficiency with slimmer floor structure, and improved usability with less vertical components
Summary
Architects, engineers and project managers face many challenges while implementing a building project from its conceptual sketch to the ultimate completion. In order to speed up the building process and at the same time to ensure the quality of construction works, an exceptional solution has emerged, i.e., composite beams. Due to their fast installation and adaptability to any architectural solution, composite beams are currently applied worldwide. Composite construction is a common structural solution for multi-storey buildings in Lithuania. Slim floor systems in multi-storey buildings in Lithuania are used due to several advantages, such as additional room height, a lower number of columns, more architectural freedom, lower heating and cooling costs, space saving for installations, fast and safe mounting, etc
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