|Table of Contents|

Experiment on Flexural Behavior and Strengthening of Glued Timber Beams with Small Span to Height Ratio(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年06期
Page:
26-34
Research Field:
Publishing date:

Info

Title:
Experiment on Flexural Behavior and Strengthening of Glued Timber Beams with Small Span to Height Ratio
Author(s):
CHEN Bo-wang1;  LIU Chen-cheng1;  LIU Jian-wen2;  WAN Ya-ni2;  LYU Wei-lei1;  LIU Yu-qi1
(1. School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, Hunan, China; 2. Hunan Architectural Design Institute Limited Company, Changsha 410012, Hunan, China)
Keywords:
glued timber beam with small span to high ratio;  shear failure along grain;  screw;  steel plate;  ultimate bearing capacity
PACS:
TU366.3
DOI:
-
Abstract:
In order to study the mechanical performance of the glued wood beam used in engineering, the flexural bearing capacity tests on 9 wood beams with the span to height ratio of 12 in 4 groups were carried by means of unreinforced, pasting steel at the bottom, screwing screws in the bottom bending shear area and pasting steel plates in the middle of both sides. The failure forms, load-displacement curves and other properties of the specimens were obtained through tests, and the mechanical properties and the distribution law of mid-span strain of the strengthened wood beam were analyzed. The limit span to height ratio of wood beam subjected to tensile and shear failure in three-point bending test was proposed. In the validation of cross section of bending beam strain distribution basic according with plane section assumption, the formula for calculating ultimate bearing capacity of glued timber beams with small span to height ratio and enhance member when shear failure along grain in the three-point bending test was proposed. The results show that the failure mode of the small span to height ratio glued wood beam is shear failure along the grain, and there is no sign of failure, and the failure surface basically occurs in the netural axis and the lower location of the wooden beam. The area of compression zone of bottom bonded steel beam increases, the neutral axis moves down, and the ultimate bearing capacity and stiffness both increase. The shear resistance and ultimate bearing capacity of the beam can be improved by screwing screws into the bottom of the beam and attaching steel plates to the side. The results show that the errors between the theoretical values and the measured values are mostly below 20%, and the theoretical values are safer than the measured values, which can provide reference for the design and engineering application of such components.

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Last Update: 2019-11-26