Small-diameter round timber is a forestry by-product mainly from thinning of the artificial forest. It is not suitable for direct use as structural members due to the low quality. To make use of the by-product, a buil...
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Small-diameter round timber is a forestry by-product mainly from thinning of the artificial forest. It is not suitable for direct use as structural members due to the low quality. To make use of the by-product, a built-up stud fabricated with small-diameter round timber was proposed in this paper and was intended to be employed in a shear wall for light wood frame construction. The load-carrying capacity of the built-up stud was investigated experimentally by testing of the specimens under axial compression and testing of the specimens under eccentric compression, respectively. To predict the load-carrying capacity considering buckling, the equation for the modified slenderness ratio of the stud was derived. The predicted load-carrying capacity using the modified slenderness ratio correlated with the test very well. Some suggestions were then given to enhance the load-carrying capacity of the built-up stud. The study provides reference for incorporating the small-diameter round timber into a shear wall of light wood frame construction and thus promotes the application of small-diameter round timber as structural members.
In this paper, the mechanical property of damaged concrete after impact was investigated. Firstly, the specimen was crushed by using drop hammer impact test machine in order to cause initial damage. Then compression-a...
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In this paper, the mechanical property of damaged concrete after impact was investigated. Firstly, the specimen was crushed by using drop hammer impact test machine in order to cause initial damage. Then compression-after-impact tests were carried out to examine and compare the damage responses of the specimens, and some stress-strain curves of the specimens under different damage degrees were obtained. Test parameters, such as the strength grade, height of the fall and drop weight were studied. The damage behaviors of the 24 tested specimens with the acquired UT (ultrasonic test) data were analyzed. The experiment results indicate that using UT to test the damage of concrete is highly sensitive;Concrete elastic modulus and compressive strength after impact are reduced. Brittle fracture of the concrete specimen after impact is remarkable.
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