Predicting Strand Transfer Length in Pretensioned Concrete: Eurocode versus North American Practice

FHWA / IN / JTRP - 99 / 3 EVALUATION OF STRAND TRANSFER AND DEVELOPMENT LENGTHS rN PRETENSIONED GIRDERS WITH SEMI - LIGHTWEIGHT CONCRETE

Future Directions for Reinforced Concrete Wall Buildings in Eurocode 8

The current Eurocode 8 belongs to one of the most advanced international seismic design codes. This leading edge should be maintained in future revisions of the code while the code should become as user friendly as possible. This article makes several proposals in which way the reinforced concrete wall sections in future versions of the Eurocode can be extended in its scope but simplified in it...

Precast, Pretensioned, Post-Tensioned Concrete for Bridge Decks

The problem of concrete bridge deck deterioration on many of our newer as well as older bridges is severe, somewhat perplexing as to cause, and difficult to solve. Furthermore, the cost to highway agencies for their repair, and the cost of delay to the highway user, can be extremely large. The use of precast, prestressed concrete for bridge decks is a con­ cept of construction or reconstruction...

Predicting future coexistence in a North American ant community

Global climate change will remodel ecological communities worldwide. However, as a consequence of biotic interactions, communities may respond to climate change in idiosyncratic ways. This makes predictive models that incorporate biotic interactions necessary. We show how such models can be constructed based on empirical studies in combination with predictions or assumptions regarding the abiot...

TOPOLOGY OPTIMIZATION OF PRETENSIONED CONCRETE BEAMS CONSIDERING MATERIAL NONLINEARITY

In this paper, the bi-directional evolutionary structural optimization (BESO) method is used to find optimal layouts of 3D prestressed concrete beams. Considering the element sensitivity number as the design variable, the mathematical formulation of topology optimization is developed based on the ABAQUS finite element software package. The surface-to-surface contact with a small sliding between...