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Experimental Investigation on Bending Behavior of Innovative Poplar LVL Floor Diaphragms

https://research.thinkwood.com/en/permalink/catalogue3213
Year of Publication
2022
Topic
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Application
Floors
Author
Sun, Xufeng
Wang, Changyuan
Liu Yan
Ma Hongwei
Tang, Shukai
Organization
Yangzhou University
Editor
Zhang, Nan
Chen, Lingkun
Zhang, Qinghua
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Application
Floors
Topic
Mechanical Properties
Keywords
Poplar LVL
Floor Diaphragm
Orthogonal Rib Beam
Bending Behavior
Experimental Tests
Research Status
Complete
Series
Sustainability
Summary
Poplar laminated veneer lumber (poplar LVL) is made of fast-growing poplar veneer and structural adhesive, which owns the advantages of sustainability and stable quality. Here an innovative poplar LVL floor diaphragm is presented, mainly made up of orthogonal rib beams fitted together using L-shape steel connectors. The paper mainly deals with an experimental study on the bending behavior of the floor under transverse uniform load. Full-scale testing on eight 3.6 m × 4.8 m specimens shows that the damage phenomena of the floor mainly exhibited as the separation between the rib beams and pulling out from the rib beam for the tapping screw. Though some local damage phenomena appeared before the preset maximum loading level, the load-deflection curves basically kept linear for most of the specimens. Under the service load level of 2.5 kN/m2, the distribution of deflection and strain for the full-length rib beam substantially exhibited the characteristic of a two-way slab. In contrast, for the segmented rib beam, the situation was much more complex. Due to the parametric design of the specimens, testing results illustrated that the rib beam height played the most important role in floor stiffness. Next was the sheathing panel, while the role of segmented rib beam spacing was relatively unremarkable. At last, a revised pseudo-plate method was proposed to evaluate the maximum deflection of the novel floor, which considered the composite action by rigidity factors.
Online Access
Free
Resource Link
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Racking Performance of Poplar Laminated Veneer Lumber Frames and Frame-shear Hybrid Walls

https://research.thinkwood.com/en/permalink/catalogue2990
Year of Publication
2021
Topic
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Application
Frames
Author
Liu, Yan
Gao, Zizhen
Ma, Hongwei
Gong, Meng
Wang, Honghe
Organization
Yangzhou University
University of New Brunswick
Year of Publication
2021
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Application
Frames
Topic
Mechanical Properties
Keywords
Poplar LVL
Frame-shear wall
Load Spreader Beam
Racking Performance
Research Status
Complete
Series
BioResources
Summary
This study examined the racking performance of poplar laminated veneer lumber (LVL) frames using bolted steel filling plates to connect beam-column joints, poplar LVL frames using the embedment bars to connect beam-column joints, and frame-shear hybrid walls made of poplar LVL studs and oriented strand board (OSB) sheathing panels. A new design load spreader beam was used on the side of the top of a specimen to apply monotonic and cyclic loadings. It was found that the lateral force resistance, stiffness, and ultimate loads of poplar LVL pure frames with bolted steel filling plate connections and closed rod connections were much lower than those of the poplar LVL frame-shear wall hybrid structure. The highest initial stiffness of the poplar LVL hybrid frame-shear wall was 1.77 kN/mm, which was 24% and 22% lower than that of the conventional shear wall made with spruce-pine-fir studs and OSB or plywood sheathing panels, respectively. The poplar LVL frame-shear wall hybrid structure showed lower degradation in stiffness than the conventional shear wall. The hybrid frame-shear wall structures made of poplar LVL could meet the requirements of Chinese standard; however, diagonal braces were required in use of poplar LVL pure frames.
Online Access
Free
Resource Link
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