Identification of factors shaping tender prices for lightweight

Abstract

<jats:p>A reliable estimation of the tender prices for lightweight curtain walls is a complex and time-consuming process for the contractor, as it depends on many factors related to both the technical parameters of the designed façade and the investor’s requirements for the solutions selected. The aim of the paper is to identify the factors affecting the costs of manufacturing lightweight curtain walls. Data regarding the complexity of curtain wall construction costs was obtained on the basis of the analysis of project documentation, cost estimates and as-built accounts for selected 50 public buildings. The authors identified the factors affecting the costs of aluminum-glass facades and ventilated facades. Their identification is the first element necessary to develop a new method of predicting the costs of implementation of such types of facade which are included in the authors’ research plans.</jats:p>

Structural Analysis of Factors Influencing the Costs of Facade System Implementation

“…The authors identified cost factors with the analysis of project and cost documentation and as-built settlements for cases, as well as direct interviews with contractors and investors. The factor identification studies presented in this paper constitute an extension of the preliminary studies, the results of which have been previously presented [18]. Finally, the completed study included 80 cases of public buildings constructed in the years 2013-2019 in Poland.…”

“…The core of the facade is made of aluminium sections, while the filling is glass. The most frequently used systems are mullion-transom, semistructural, and structural systems [18]. Types of aluminium-glass facades are illustrated in Figure 1.…”

“…The other facade system frequently used for public buildings in combination with aluminium and glass facades is a ventilated facade [18]. This solution is based on leaving a ventilation gap between the external cladding and the thermal insulation layer.…”

Application of the Bayesian Networks in Construction Engineering

“…The influence of new technologies is visible in contemporary works, including the implementation of BIM standards in the construction investment process [27], or the use of information from the "Big Data" [6]. The authors of many papers describe the implementation of the results of their research to the construction industry [9,18,19,24], cost of construction works [13,17,21,25], risk in construction [15,16,23]. One example combining the practical aspect and high research potential are the Bayesian Networks.…”