OF THE BEHAVIOR OF FREE-STANDING
This thesis investigates the behavior of free-standing gabion walls in areas of mild seismicity. To investigate this behavior, three walls of varying internal cable patterns were constructed at a quarter-scale. These walls were tested with a mass shaker, and mode shapes, tone extractions, and damping ratios were calculated. A modal analysis was conducted using design spectra created from a suite of seven earthquakes from countries bordering Kenya. The corresponding lateral forces to these spectral displacements were found, and the restoring eccentricities from the soil restoring force were backed out through a summation of moments. All analysis was experimentally done due to the complexity of properly modeling the wall system for a secondary analytical comparison. This process was done under the assumption of linear behavior. Similarly, the criteria for failure involved the eccentricity of the restoring soil force exceeding the kern distance (assuming elastic behavior)—criteria that all three of the wall specimens met. However, further research into the nonlinear behavior of this wall type is suggested for future conclusions on free-standing gabion wall behavior.
Analysis of Stabilized Adobe in Rural East Africa
ANALYSIS OF STABILIZED ADOBE IN RURAL EAST AFRICA Grace Ying Yu Chen This project seeks to assist people in rural East Africa by proposing sustainable building methods which implement affordable and durable adobe bricks for construction. Adobe, one of the oldest sustainable building materials in the world, is strong when dry but lacks structural integrity when exposed to moisture. Chemical additives such as cement and lime are added into the adobe mix to protect the brick against moisture decomposition. Once the chemicals are added and the mix is formed into a brick, a stabilized adobe brick is formed. Cement, a stabilizer, is locally available in East Africa, but is generally unaffordable for families in rural areas. Lime is also locally available and costs about half the price of cement. This project investigates reducing the amount of cement to produce an economical and stabilized brick. The tested brick mixes, measured by volume, were • 10% cement • 5% cement • 5% cement+5% lime • 7% lime with sand • 7% lime with clay only • 10% lime with sand After testing these bricks by water jet, submersion, modulus of rupture, and compression, the 5% cement+5% lime mix and the 7% lime with clay mix proved to be viable options for economical and durable bricks. Analysis of Stabilized Adobe in Rural East Africa v The second half of this project contains summaries of research related to stabilized adobe and other soil building methods. A literature search shows that lime mixed with soil containing small particles rich in calcium carbonate and quartz produces proper cementation in the mix called carbonation.
The Poet, The Critic, and the Moralist: Horace, Epistles 1.19
I begin by quoting from two valuable recent works on Horace. Professor Brink in his Horace on Poetry (1964) writes: ‘The centre of the short piece lies in lines 21—34. Readers, among them critics and poets, had denied one aspect of the Odes which was surely above criticism—the striking originality of these poems. Horace's defence turns on the question of originality’ (p. 180) and ‘Epistle 19 is unique in that it alone among the literary satires and letters reiterates Horace's claim to be the Latin fidicen’ (p. 182). And Dr. McGann in his Studies in Horace's First Book of Epistles (Collection Latomus 100: 1969): ‘In Ep. 19... as in the literary satires, Horace is a practising poet or at least a very recently practising one, engaged in defending himself against hostile criticism’ (p. 40) and ‘As the only epistle concerned exclusively with literary matters, the nineteenth stands apart’ (p. 82).