Application of a New System of Self-Tensioning to the Design of Large-Span Wood Floor Framings

Abstract

This study describes a self-tensioning system in which the gravitational loads acting on a horizontal structural element are automatically converted to a posttensioning force on that component. The self-tensioning effect has a variable intensity, constantly adjusted depending on the applied service loads. The selftensioning is eccentrically applied over the cross-section, and it generates a negative moment that compensates the deformations due to the gravitational loads. The system can be utilized in beams, slabs and structural framings of different materials and can be implemented using different mechanical and hydraulic solutions. The study describes the operation of a mechanical solution for the self-tensioning system and analyzes its behavior in large-span timber floor framings. When combined with conventional pre-tensioning, the selftensioning system notably improves the strength and deformation behavior and permits a design of timber floor framings with a total height of 0.03 times the span length, achieving relative deflections below 1/1000 of the span for the service loads of the structure. Headings Post-tensioning, self-tensioning, prestressing, pre-tensioning, tensioning systems, long-span, timber flooring, wooden structures.

Self-tensioning long-span T-shaped spruce and oak web floors with a CLT upper flange. An experimental approach

“…1, α0 = 16.94°). Previous studies indicated that this configuration could display notable efficacy in transforming slight descents of the supports into a significant self-tensioning force [18].…”

“…This system has been patented, and it was initially developed to resolve long spans, in which post-tensioning is self-adjusting depending on the loads applied at any given time. This design has been subjected to several previous analytical studies [16][17][18], and these are now completed by an experimental study to validate its performance.…”

Experimental Analysis of Pretensioned CLT‐Glulam T‐Section Beams

“…An efficient way to avoid this limitation in the pretensioning force is to apply a variable tensioning force that generates a counterbalance effect relative to the applied forces. With this goal in mind, the authors developed the SsS© (Self-stressing System) [34,35].…”

Data Sensing and Processing Tensioning System Based on the Internet of Things

“…Prestressed concrete beams are widely used in highway and railway construction [1], and their production process consists of four steps, namely, template installation, reinforcement assembling, concrete pouring, and prestress tensioning. Prestress tensioning is an important measure to improve the tensile strength of concrete [2][3][4][5][6], and its results directly affect the performance and quality of bridges [7,8]. The development of numerical control technology and smart devices has made intelligent tensioning a mainstream technology.…”