The use of equivalent beam models to estimate the dynamical characteristics complex tall buildings has been investigated by several authors. main reason is structural response estimation stochastic loads, such as wind and earthquake, using a reduced number degrees freedom, which reduces computational costs therefore gives designer an effective tool explore possible solutions. In this paper, nov...

The chain graph sandwich problem asks: Given a vertex set V , a mandatory edge set E1, and a larger edge set E2, is there a graph G= (V ,E) such that E1 ⊆ E ⊆ E2 with G being a chain graph (i.e., a 2K2-free bipartite graph)? We prove that the chain graph sandwich problem is NP-complete. This result stands in contrast to (1) the case where E1 is a connected graph, which has a linear-time solutio...

The aim of this work is to evaluate the influence of fabrication methods on the com-pressive properties of sandwich composites using both experimental work and numerical simulations. Two types of sandwich composites with E-glass/Kevlar/polyester resin facings and End-grain balsa wood as core have been produced by vacuum infusion processing (VIP) and hand-lay up (HL) method. Compression tests on...

This study is limited to study of buckling analysis of a sandwich cylindrical shell with functionally graded face sheets and homogenous core. High-order sandwich plate theory is improved by considering the in-plane stresses of the core that usually are ignored in the analysis of sandwich structures. Assume that all properties of the face sheets and the core are temperature dependent. Strain com...

Previously, we have developed a novel porous hydroxyapatite/poly l-lactic-co-caprolactone (HA/PLCL) composite sandwich beam as new scaffold material for bone regeneration. This work presents the study of bending fracture mechanisms and microdamage L-lactic-acid (HA/PLLA) beam, in comparison to previous HA/PLCL beam. Both beams were fabricated using method which single layered between two polyme...