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The following abstracts are from papers presented by P.J. Yttrup & Associates and the full papers are available upon request via email.

Title: Strength of Earth Masonry (adobe) walls subjected to Lateral Wind Forces
Author: P.J. Yttrup
Delivered: 7th International Brick Masonry Conference, Melbourne, Australia, 17-20 February 1985
Summary: Unfired earth masonry, mudbrick or adobe is being used for building construction at an increasing rate in Australia, and also in many other contries. This paper represents a rational method for calculating the lateral strength of earth masonry wall panel. Lateral loads on earth panels are produced by wind forces for example, and assumed uniformly distributed. Experimental verifiction of the theoretical method is presented using full scale laboratory and field tests. The effect of roof uplift forces transmitted to earth walls is also considered.

Title: Design criteria for Timber Structures
Author: P.J. Yttrup and B. Hutchings
Delivered: 2nd Pacific Timber Engineering Conference, Auckland, New Zealand, 28-31 August 1989.
Summary: The control of deflections in timber structures is often the limiting design criteria. Traditionally design criteria have been expressed as limiting values of span/deflection. This persists and is used routinely in design offices. The use of such criteria for assemblages is often difficult or inappropriate. The paper presents an approach to deflection design which is capable of general application to elements and to assemblage of elements.

Title: The development of a computer model for a Corbelled Timber Beam Road Bridge
Author: P.J. Yttrup and T.D. Evans
Delivered: Timber Bridges Conference, Melbourne, Australia, 4-6 November 1992
Summary: The development of a computer model for a corbelled timber beam road bridge is described. The methods used to calibrate the computer model against field tests performed on the real structure and the derivation of some model element section properties from stiffness tests on individual bridge members is discussed. A summary of the impact of modifying bridge element properties in the computer model via sensitivity studies is also included as well as discussion of the limitations and possibilities for extending the uses of the computer model.

Title: Bearing Capacity of Small Diameter Timber Piles in Sand
Author: P.J. Yttrup and A.S. Miner
Delivered: 4th Australian - New Zealand Conference on Geometrics, Perth, Australia, 14-18 May 1984
Summary: The results of 31 load tests done on driven timber piles of diameter 75mm to 200 mm are presented. The piles had driven lengths of 500mm, 1000mm and 1500mm. The comparison of the predicted capacity of the piles with measured capacity suggests that pile driving formula such as the Hiley and Janbu consistently over estimate pile capacity by about 60%. A simple pile driving formula is shown to give excellent correlation with the experimental results.

Title: Concrete Enhanced Timber
Author: P.J. Yttrup
Delivered: International Wood Engineering Conference, New Orleans, USA, 29-31 October 1996
Summary: The potential of timber-concrete composite construction is well known and proven. The methods of achieving composite behavior have been significantly influenced by steel concrete detailing with mechanical connectors such as nails, spikes, bolts, dowels and similar being used. Glued blocks and cut notches have also been used. The investigation reported in this paper explores the achievement of composite action by embedment of the beam prepared with small scale "dimples" into the timber, completely eliminating the need for steel connectors. This achieved enhanced structural performance, and hence the term "Concrete Enhanced Timber".

Title: Lattice Trusses, Architectural and Engineering Design
Author: P.J. Yttrup and G.J. Frenchman
Delivered: 2nd Pacific Timber Engineering Conference, Auckland, New Zealand, 28-31August 1989
Summary: Lattice trusses differ from other trusses in their use of closely spaced web members run in opposing directions to create a "lattice" The architectural merits of such trusses is their fine or delicate appearance compared with more bulky conventional trusses. The engineering analysis and design of such trusses is difficult leading the authors to conduct load tests of prototypes. The paper presents the forms of lattice truss used by the authors and their results of load test results.

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