The insulation in buildings is very important. Insulation used in the building is largely divided into organic and inorganic insulation by its insulation material. Organic insulation materials which are made of Styrofoam or polyurethane are extremely vulnerable to fire. On the other hand, inorganic insulation such as mineral wool and glass wool is very weak with moisture, while it is nonflammable, so that its usage is very limited. Therefore, this study developed moisture resistance applicable to mineral wool and glass wool and measured the thermal conductivity of the samples which are exposed to moisture by exposing the product coated with moisture resistance and without moisture resistance to moisture and evaluated how the moisture affects thermal conductivity by applying this to inorganic insulation.
In this study, the theoretical and numerical models are developed for the fully coupled static and dynamic analyses of the shear deformable laminated composite beams with channel-sections based on an orthogonal Cartesian coordinate system. The current composite beams take into account the transverse shear and the restrained warping induced shear deformation by using the first-order shear deformation beam theory. An analytical technique is used to derive the strain energy, the geometric potential energy, and the kinetic energy of the beam in a systematic manner considering all the deformation effects and their mutual couplings. To solve the static and dynamic problems, three different types of finite beam elements, namely, linear, quadratic and cubic elements are used. In order to demonstrate the validity of this study, the numerical solutions for the static and dynamics problems of channel-section beams are presented and compared with the experimental test results and the results obtained from other researchers, and the detailed three-dimensional analysis results using the shell elements of ABAQUS. The vibrational behavior is investigated with respect to the modulus ratios and the fiber angle change. Especially, the effect of shear deformation under the compressive and tensile forces on the coupled vibrational mode is newly studied.
The two-and three-noded spatially coupled thin-walled finite curved beam elements are presented on the basis of assumed strain fields. These elements consider the extensional/inextensional conditions along the centroid axis of curved beam. For curved beams with the extensional condition, the two-noded element is formulated from constant strain and linear curvature fields. And the strain is assumed as linear filed and curvatures are assumed to be third-order ones for the three-noded element. In addition the normal stress at an arbitrary point of symmetric and non-symmetric cross-sections is explicitly evaluated since strain and curvature functions are assumed independently. In order to illustrate the accuracy and the practical usefulness of the present assumed strain curved beam elements, the displacements and the normal stresses of curved beams are evaluated and compared with the previously published results and the solutions by the shell elements from SAP 2000. The emphasis is given in investigating the influence of inextensibility along the beam axis on the coupled behavior of curved beam with respect to the values of boundary condition, subtended angle, and slenderness ratio.
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