Simplified full-depth precast concrete deck panel systems for accelerated bridge construction

A simplified full-depth precast concrete deck panel system for accelerating bridge construction （ABC） is introduced and a finite dement analysis （FEA） is con- ducted to investigate the static and dynamic responses of this conceptual deck system. The FEA results are compared to those of the traditional full-depth precast concrete deck panel system. The comparison results show that the mechanical behavior of the new deck system is different from that of the traditional deck system. The concrete decks in the new system act as two-way slabs, instead of the one-way slab in the traditional system. Meanwhile, the connections in both the longitudinal and transverse direc- tions may need to accommodate the negative moments. Compared to those in the traditional system, the longitu- dinal nominal stress at middle span increases a lot in the new deck system and the effective flange width varies significantly. In addition, the dynamic results show that the impact factor is influenced by the spacing of connections. Finally, some design concerns of the new deck system are proposed.

Study on Construction of Forestry Socialized Service Systems Based on Barnard's Organizational Structure Theory

Construction of forestry socialized service systems is the important content for reform of collective forestry tenure systems.Based on the necessity,possibility and problem of construction of forestry socialized service system,according to Barnard's Organizational Structure theory,the path and countermeasure of forestry socialized service system in China are discussed.

Level of Acceptance of Industrialized Construction in Brazil by Assessing the Degree of Satisfaction of User

This paper compares the satisfaction of users of residential buildings produced by two construction processes considered as industrialized:“prefabricated masonry panels”and“reinforced concrete walls molded on site”and compared with“conventional process”(structural masonry of concrete blocks).The premise of the study was to diagnose the level of acceptance of the buildings considered industrialized by the Brazilian population,aiming to assess whether the preference for the systems considered“conventional”and the rejection of the“industrialized”is decreasing in Brazil.This article concerns the results obtained in the second phase of the research,which was carried out after five years of the first phase.So,if the buildings were considered new in the first phase,this second research was carried out after the depreciation due to the action of time.To quantify the“degree of satisfaction”the same checklist of the first survey was applied,in the same neighborhood and the sum attributed to each answer made by residents was applied and,as a result,it was possible to ascertain the oscillations in it and to confirm the satisfactory acceptance of industrialized construction systems and a tendency to reduce rejection by the population in relation to the innovative construction systems.

THE TRACE IDENTITY, A POWERFUL TOOL FOR CONSTRUCTING THE HAMILTONIAN STRUCTURE OF INTEGRABLE SYSTEMS (Ⅱ)

An isospectral problem with four potentials is discussed. The corresponding hierarchy of nonlinearevolution equations is derived. It is shown that the AKNS, Levi, D-AKNS hierarchies and a new oneare reductions of the above hierarchy. In each case the relevant Hamiltonian form is established bymaking use of the trase identity.