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"Formwork"
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Physical and mechanical modeling of shaping pneumatic formwork by bicubic splines
The article deals with the hierarchical design structure, consisting of four stages of the stress state of pneumatic shells. The main tasks of designing and constructing pneumatic formworks during the construction of thin-walled architectural shells are considered. The introduction of pneumatic formwork into architectural and construction practice has a significant impact on the ability of the architect, builder and designer in the search for new and more advanced forms, as well as the builder in translating the creative ideas of the architect into steel and modern concrete. Thanks to the flexibility and elasticity of the material, it allows the construction of curvilinear spatial shells of a new elastic quality level. The proposed geometric model makes it possible to obtain a variety of software as well as the formation of a discrete-point frame of a finite shape by bicubic splines, which provides a predetermined accuracy for solving subsequent software design and construction problems.
Journal Article
The analysis of column hoop layout for steel formwork
In this paper, based on the code, the stress and arrangement of column forms under different widths are analyzed, and the arrangement of column hoop under different form widths is calculated by adjusting formula algorithm and parameter selection. The analysis shows that when the width of the template changes from 100 mm to 300mm, the maximum spacing of the column hoop decreases first, then increases and then decreases. When the steel grade of the template is different, multiple formulas should be used to compare the calculation, and the typical width cannot be used as the representative value. Increasing the thickness of the template and increasing the strength grade of the steel can optimize the spacing arrangement of the column hoop, and improving the strength grade of the steel can optimize the column hoop arrangement more effectively for wide form.
Journal Article
Selection of formwork options when constructing high-rise buildings by AHP method (Case Study: Cao Lanh city, Vietnam)
Selecting the right construction formwork solution is vital to the success of a construction project. It can help speed up the construction schedule, boost quality, reduce construction costs, and ensure the safety of workers on the construction site. Construction contractors should carefully consider the project’s characteristics and their capacity when selecting the most suitable formwork solution. The Analytic Hierarchy Process (AHP) method is a decision-making tool that can be useful in selecting the best formwork solution for constructing high-rise buildings. The AHP method allows decision-makers to break down complex decisions into smaller, more manageable parts and to evaluate alternatives based on a set of criteria. The paper presents the process and propose the use of the method in selecting formwork options.
Journal Article
Formwork Engineering for Sustainable Concrete Construction
This study provides a comprehensive review of the engineering challenges of formwork in concrete construction. The paper investigates different formwork systems, their design based on form pressure, and the difficulties of form stripping. Alternative binders are gaining more and more interest by opening new opportunities for sustainable concrete materials and their impact on form pressure and concrete setting is also investigated in this paper. The discussion involves several engineering challenges such as sustainability, safety, and economy, while it also explores previous case studies, and discusses future trends in formwork design. The findings pinpoint that choosing an appropriate formwork system depends significantly on project-specific constraints and that the development of innovative materials and technologies presents significant benefits but also new challenges, including the need for training and regulation. Current trends in formwork design and use show promising possibilities for the integration of digital technologies and the development of sustainable and ‘smart’ formwork systems. Continued research within the field has the possibility to explore new formwork materials and technologies, which will contribute to the implementation of more effective and sustainable practices in concrete construction.
Journal Article
Product Showcase
Formwork & Accessories Doka 360 Doka announced Doka 360, an integrated customer platform that digitally connects and streamlines key touchpoints-from planning and ordering to site operations and return logistics-along the formwork process. Doka, www.doka.com Topcon CR-H1 Topcon Positioning Systems has announced the CR-H1, a handheld solution that is one of the latest additions to the company's Capture Reality portfolio of mass data solutions. The system is designed and optimized for performance, durability, and safety for the U.S. market.
Trade Publication Article
Applicability of Formwork Automation Design Software for Aluminum Formwork
In this study, by applying the developed formwork automation design software to three target structures, we reviewed the applicability of the formwork automation design software for the aluminum formwork. To apply the formwork automation design software, we built an aluminum formwork library based on the conversion of two-dimensional (2D) computer-aided design (CAD) data to three-dimensional building information modeling data for all the components of the aluminum formwork. The results of the automated formwork layout on the target structures using the formwork automation design software confirmed that the wall and deck members were laid out by the set algorithm according to the formwork size and direction. However, because of the limited functionality of the software, the level of completion of the formwork layout was found to be lower than that of the manual formwork layout based on 2D CAD data. The currently developed software is based on a simple algorithm, but has a drawback in that the automated layout is limited to only some of its members. Therefore, additional research should be conducted on the development of advanced software through the diversification of the algorithm, automation of preprocessing of the mesh, and analysis of the relationships of all the members comprising the formwork.
Journal Article
A failure mode, effects and criticality analysis-based method for formwork assessment and selection in building construction
PurposeThis study aims at introducing a method based on the failure mode, effects and criticality analysis (FMECA) to aid in selecting the most suitable formwork system with the minimum overall cost.Design/methodology/approachThe research includes a review of the literature around formwork selection and analysis of data collected from the building construction industry to understand material failure modes. An FMECA-based model that estimates the total cost of a formwork system is developed by conducting a two-phased semi-structured interview and regression and statistical analyses. The model comprises material, manpower and failure mode costs. A case study of fifteen buildings is analysed using data collected from construction projects in the UAE to validate the model.FindingsResults obtained indicate an average accuracy of 89% in predicting the total formwork cost using the proposed method. Moreover, results show that the costs incurred by failure modes account for 11% of the total cost on average.Research limitations/implicationsThe analysis is limited to direct costs and costs associated with risks; other costs and risk factors are excluded. The proposed framework serves as a guide to construction project managers to enhance decision-making by addressing the indirect cost of failure modes.Originality/valueThe research proposes a novel formwork system selection method that improves upon the subjective conventional selection process by incorporating the risks and uncertainties associated with the failure modes of formwork systems into the decision-making process.
Journal Article
Behavior of Low-Carbon Fabric-Formed Reinforced Concrete Beams with Varying Shapes
In this study, fabric formwork is used to cast I-shaped and non-prismatic tapered reinforced concrete (RC) beams that have up to a 40% reduction in concrete volume, resulting in lower embodied C[O.sub.2] than a rectangular prismatic beam. The primary aim of this research is to use distributed sensing to characterize the behavior of these shape-modified beams to an extent that was not previously possible and compare their behavior to that of a conventional rectilinear beam. Four RC beams (a rectangular control and three fabric-formed sections) were tested in three-point bending. Distributed fiber-optic strain sensors were used to measure strains along the full length of the longitudinal reinforcement, and digital image correlation (DIC) was used to acquire crack patterns and widths. The results indicate that fabric-formed RC beams can achieve the same load-carrying capacity as conventional rectilinear prismatic beams and meet serviceability requirements in terms of crack widths and deflections. The longitudinal reinforcement strains along the full length of the specimens were captured by Canadian concrete design equations, which account for the effects of both flexure and shear on reinforcement demand. Keywords: digital image correlation (DIC); distributed fiber-optic sensing (DFOS); fabric formwork; low-carbon concrete; shape modification.
Journal Article