Serviceability Limit State Design Research Articles

EN1992 Eurocode 2: Design of concrete structures

EN1992 Eurocode 2: Design of concrete structures is of fundamental importance to civil engineers given the predominance of concrete in civil engineering construction. The first part of the code, covering common design rules and design requirements for fire, is likely to be approved in January 2002 and should be released in EN standard form by 2003.The second and third parts, covering design of bridges and liquid-retaining structures respectively, are due for release in 2005.This paper looks primarily at the two sections that make up the first part. It explains the principles of ultimate and serviceability limit state design and the requirements for shear, durability and fire in particular. It also lists the other European standards to which concrete designers will need to refer.

Geosynthetic strength — ultimate and serviceability limit state design : Fannin, R J; Herman, S Proc Conference Stability and Performance of Slopes and Embankments II, Berkeley, 29 June–1 July 1992V2, P1411–1426. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31)

Geosynthetic strength — ultimate and serviceability limit state design : Fannin, R J; Herman, S Proc Conference Stability and Performance of Slopes and Embankments II, Berkeley, 29 June–1 July 1992V2, P1411–1426. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31)

鉄筋コンクリート床スラブの1次固有周期推定法

To serve as a practical solution which seems still unavailable to the problem of estimating the period Ti of natural vibration of reinforced concrete floor slabs, an approximate approach is herein proposed including the effect of their cracking and time-dependency. Admittedly the estimation is a major consideration in their serviceability limit state design. Consequently it has been clarified that Ti is proportional to the square root of long-time slab deflection with the proportional constant satisfactorily expressed in function form in terms of the ratio of the long-time value to the elastic value of slab deflection. Hence in practice Ti is readily predictable from a long-time deflection which may be estimated by the AIJ' s or other prediction methods.

Wind drift serviceability limit state design of multistory buildings

Wind drift serviceability limit state design of multistory buildings

Wind drift serviceability limit state design of multistory buildings

In this paper, research needs are forwarded which would lead to the development of a consistent and rational methodology for the wind drift serviceability limit state design of multistory buildings.

Load distribution in edge stiffened slab and slab-on-girder bridge decks

The results of a study on the effect of edge beam geometry on the static live-load load distribution characteristics of single-span slab and slab-on-girder bridge superstructures are presented. Using a grillage analysis, the influence of various forms of edge stiffening on longitudinal bending moment and vertical deflection at midspan was investigated. Two load cases utilizing the Ontario Highway Bridge Design truck were considered. Of particular interest is the load case of a single vehicle in a travelled lane, as edge beam deflection under this condition is governed by a serviceability limit state design requirement of the Ontario Highway Bridge Design Code.For the bridge geometry and loadings considered, all types of edge stiffening significantly affect edge beam bending moment and deflection at midspan; the effect generally increases as the span decreases. Edge beam bending moment increases as the stiffness of the edge beam is increased. Considering the change in edge beam stiffness, edge beam deflection decreases even though the bending moment carried by the edge beam increases. The results of the grillage analysis agree well with an interpretation of the simplified method of analysis of the Ontario Highway Bridge Design Code. When the deflection criterion is affecting a bridge design, it would be beneficial to account for the edge stiffening. Key words: load distribution, edge stiffening, edge beams, bridge deck analysis, grillage analysis.