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Experimental Study on Loading Capacity of Bottom Net Used in Enriched Cage for Laying Breeder Hens

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131595394,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131595394) @2013
Authors:   Tengfei Li, Heng Li, Hongying Wang, Baoming Li, Jie Yang
Keywords:   Egg breed chicken Enriched cage Bottom net Mechanical properties Experiment

Abstract. In order to study the influence of stiffener and suspension beam on loading capacity of bottom net used in enriched cage for laying breeder hens , an experimental model with the dimension of 2000mm×800mm is designed, static test is conducted after introducing four factors including stiffener prestress loss, fixed nut failure of stiffener , stiffener rigidity and suspension beam rigidity. The experimental results show that the nonlinear relationship found between loads and displacements just indicates the nonlinear properties of bottom net structure. Rigidity of the system and stiffener internal force improve with the increase of stiffener prestress. The displacement changing rate induced by the fixed nut failure of stiffener is at a minimum when the applied load is 300N, stiffener 2 affects the displacement changing rate most significantly and then stiffener 1, stiffener 3,respectively. Before the installation of stiffener and suspension beam, the structural rigidity actually increases slowly with increasing external loads, and greater initial prestress is more beneficial to load bearing capacity of the structure. But too large an initial prestress may overload the supporting structures of the bottom net. It is concluded that the cooperation between suspension beam 1 and suspension beam 2 can improve the rigidity of bottom net structure obviously. The rigidity contribution rate of the stiffener 2 was above 50%, the stiffener 3 had almost no influence on the rigidity of the bottom net structure. Combining the deflection equation of grid structure with the regressive function of bottom net structure, the mathematical model of bottom net structure has been given.

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