The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
This report concerns itself with the latter objective of estimating static load hearing capacity of piling. This paper describes how the wave equation can be used to estimate the soil resistance acting on a pile at the time of driving. Knowing the soil resistance on the pile at the time of driving, one can then estimate the load bearing capacity by
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This report describes a study conducted to determine the temperature gradient throughout the depth of a six inch concrete bridge deck. The bridge deck selected for study was constructed using lightweight concrete for the center spans and sand and gravel concrete for the remaining spans. This enabled us to determine the difference, if any, in the te
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Reported in this paper are the results of twenty-eight model tests of drilled shaft footings subjected to overturning horizontal loads. The models are geometrically similar but reduced by a factor of six compared to the average size of footings used for minor service structures in Texas. The soils investigated range from cohesionless sands, through
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Objectives of the Study are to: (1) Investigate the asphalt cements used by the Texas Highway Department, (2) Establish specifications to assure the use of superior asphalts by the Department, and (3) Determine how the durability of asphalt cements in service can be improved. This report presents experimental data arranged to answer the question "W
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The primary purpose of this study was simply to determine the destinations of potatoes shipped from the Red River Valley. This analysis includes the volume shipped to each area and the type of market within each destination area, that is, the potatoes were categorized as table stock, institutional stock, or seed stock. Each type of potato is ultima
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A computer program, BMCOL 43, is presented which can efficiently analyze a beam-column subjected to movable static loads. The program is built around the computer simulation of a beam-column subjected to stationary loads which is described in Ref 1. The methods used in the program are such that a beam-column can be analyzed for any pattern of trans
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The establishment and culture of grass often is hazardous. Areas planted to grass usually are not fallowed, so that grass seedlings succumb to weedy competition. Where competition is introduced by seeding aggressive annuals in the same mixture with perennial plants, it usually is necessary to limit the competition of the annuals in order to achieve
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As a preliminary to a study of the relation between bar stress, concrete cover, and corrosion, a method of injecting colored epoxy into loaded beams was developed. Later sawing of the beam exposed the filled internal crack for measurements. Crack width at the bar was found to be primarily influenced by bar stress and to average from 0.10 to 0.31 of
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For several years this department has been conducing research studies on the compaction of asphaltic concrete pavements to obtain maximum pavement life with available local materials. This study, done in cooperation with the Bureau of Public Roads, was to investigate the effects of the solid rubber tire roller as an intermediate roller and to compa
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This report primarily investigates the wear characteristics of concrete using various cement contents and three different sources of aggregates. Compressive strength and dynamic modulus of elasticity data was also obtained to assist in the evaluation of these various mixes.The testing program covered specimens representing various ages, cement cont
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In a study of 45 human subjects it was determined that a compound drug containing the antihistamine phenindamine did not statistically impair performance on a modified Mashburn coordinator. Another compound containing the antihistamine chlorpheniramine did impair performance. Performance was also impaired by increasing altitudes. The combined effec
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The major objective of the study is to determine whether Texas cargo vehicles of various types are being equitably taxed in relation to their highway use. The rationale of highway user taxation takes into account the differences in highway vehicles. It is known that variations in vehicles lead to differences in fuel efficiency and thus to greater o
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This report summarizes the findings of the "new systemsstudy. The study reflects the concern of the Department ofHousing and Urban Development for cities and their peopleas well as for their transportation. For assistance in perfomingthe study, the Department engaged 17 contractors fromindustry, scientific research centers, universities and the fou
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Conditions arise during construction of bases with Portland cement stabilized soils which require close programming of work. Therefore, time is of significant importance.That is the objective of this report; to evaluate a method by which considerable savings in time can be made. Under accepted procedures for issuing cement contents to the project e
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The study explores the effects of peripheral vision cues on the performance of a 20 ATR pilots during simulated instrument landing approaches in a Boeing 720 jet aircraft simulator. Recoveries from unusal attitudes were also investigated. Results of the study suggest that peripheral vision cues (1) improve control of bank angle during instrument ap
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Thirty-six young men were exposed for 2 hours to environmental temperatures of 10, 26.7, or 46C. Measurements of rectal and skin temperature, heart rate and respiratory rate were made, and average skin and average body temperatures were calculated. Manual performance consisted of standardized peg tests for hand and finger dexterity, and a written m
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The study quantifies several unknowns and/or uncertainties with respect to medical and general descriptive attributes of airmen denied medical certification. Data are presented concerning age, sex, occupation, total flying time, and medical characteristics of denied airmen. Certification actions at the appellate level are discussed to include medic
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The study examined some effects of stimulus size and distance on the persistence of one type of illusory motion, viz., the spiral aftereffect (SAE). Duration of SAE was investigated with stimuli of 2, 4, 8, 12, and 16 inches in diameter. The distance between the observers and the rotating spirals was varied to produce visual angles between 1 deg. 1
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Investigation of the effect of the use of the turn penalty was undertaken. Several trees from the detailed and intermediate networks in Waco, Texas with and without a turn penalty were compared and differences within each set of trees analyzed. The conclusions were as follows: Minimum path trees without a turn penalty (zero turn penalty) did not di
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The need for an efficient method of weighing the wheels of moving highway vehicles has become more pressing in recent years, particularly since highspeed, controlled-access highways have become a reality. On roads such as our Interstate Highway System, it is no longer safe nor feasible to stop vehicles on widened shoulders for weighing and measurin
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