We study the classical current algebra for principal chiral model defined on two dimensional world-sheet with general metric. We develop the Hamiltonian formalism and determine the form of the Poisson brackets between currents. Then we determine the Poisson bracket for Lax connection and we show that this Possion bracket does not depend on the world-sheet metric. We also study the Nambu-Gotto f...

In this paper, several variants of Differential Evolution, Particle Swarm Optimization and Genetic Algorithms are employed for the identification of a BoucWen hysteretic system that represents a full-scale bolted-welded steel connection. The purpose of this work is to assess their comparative performance in a highly nonlinear identification problem. Interesting results are produced that reveal ...

Because of it’s economy, high strength-to-weight ratio and stiffness-to-weight ratio, wood can compete with steel and reinforced concrete as a construction material in a market with an increasing demand for large structures such as community buildings, gymnasiums, schools and bridges. However, continued acceptance or expansion in this market, particularly in high wind or seismic areas, depends ...

Additive Manufacturing seems promising for the steel construction industry, especially small components with complex shapes. With Wire-and-Arc-Additive-Manufacturing (WAAM) a process was found which is fast and cheap compared to other processes metals. Furthermore, arc-welding well known in industry. Bolted head plates are common connection. Although they relatively easy produce, uneconomical l...

An analytical model is presented for structure-borne sound transmission at a bolted junction in a rib-stiffened plate structure. The model is based on the wave approach for junctions of semi-infinite plates and calculates coupling loss factors required by statistical energy analysis. The stiffening rib is modeled as a plate strip and the junction is represented by an elastic interlayer with a s...

Two studies examined the compatibility between herbicide release of red or jack pine plantations in Wisconsin and the maintenance of Karner blue butterfly (Lycaeides melissa samuelis), a federally listed endangered species. Wisconsin has some of the few remaining viable metapopulations of Karner blue butterfly, hereafter abbreviated as KBB. The habitats favored by KBB are also the sites well su...

Glass is a brittle material. Its use in constructing structural elements of civil engineering can still be considered as an innovative technique. In order to take a full advantage of its principal qualities (transparency, aestheticism, durability, etc.), architects are pushing the conception of glass structural elements towards the adoption of more and more slender elements, entailing necessari...