Showing papers on "Foundation (engineering) published in 1988"

Parallel Program Design: A Foundation

Abstract: Introducing a new hobby for other people may inspire them to join with you. Reading, as one of mutual hobby, is considered as the very easy hobby to do. But, many people are not interested in this hobby. Why? Boring is the reason of why. However, this feel actually can deal with the book and time of you reading. Yeah, one that we will refer to break the boredom in reading is choosing parallel program design a foundation as the reading material.

Foundation analysis and design. fourth edition

Abstract: The fourth edition of this textbook has been rewritten and provides state-of-the-art (soa) and state-of-practice (sop) methods in foundation engineering. This edition places emphasis on computer methods and finite element methods (fem), involving matrix methods, to reflect the use of the pc and fem techniques. The following chapters are presented: (1) introduction; (2) geotechnical properties; laboratory testing index settlement and strength correlations; (3) exploration, sampling and in-situ soil measurements; (4) bearing capacity of foundations; (5) foundation settlements; (6) improving site soils for foundation use; (7) factors to consider in foundation design; (8) spread footing design; (9) special footings and beams on elastic foundations; (10) mat foundations; (11) lateral earth pressure; (12) mechanically stabilized earth and concrete retaining walls; (13) sheet-pile walls - cantilevered and anchored; (14) braced, tieback and slurry walls for excavations; (15) cellular cofferdams; (16) single piles -static capacity; (17) single piles -dynamic analysis; (18) pile foundations -groups; (19) drilled piers or caissons; (20) design of foundations for vibration control.

The Mexico Earthquake of September 19, 1985—Behavior of Building Foundations in Mexico City

Abstract: During the 1985 earthquake, a number of building foundations in the lacustrine soft soil area of Mexico City presented an inadequate performance. Previous high static contact stresses between the foundation and the supporting subsoil propitiated the appearance of plastic deformations of the soil under seismic cyclic stresses, which led to settlements and tilting of the buildings. Foundations of all kinds showed different degrees of vulnerability to the earthquake, but constructions on friction piles sustained the most severe damages. This can be attributed in some cases to non compliance with the accepted design criteria and current regulations. The main factor was however the pronounced dynamic magnification of seismic movements associated to the quasi coincidence between the natural period of some structures with moderate height on friction piles, and the long period of the subsoil motions, which led to large overturning moments and shear forces at the foundation level.

Uplift Load‐Displacement Behavior of Spread Foundations

Abstract: The design of spread foundations for uplift loads is based primarily on capacity considerations, largely because there has been only a limited effort to characterize the load‐displacement response of these foundations. This paper examines the results of 75 full‐scale field tests and synthesizes the results in a convenient design procedure that incorporates estimated displacements. The effects of soil type (granular versus cohesive) and foundation type (steel grillage versus concrete slab or steel plate) are investigated, and it is found that: (1) Granular soils lead to a slightly stiffer response than cohesive soils in the initial portion of the load‐displacement curve; and (2) slab or plate foundations lead to slightly stiffer response than grillages for granular soils only. The type of foundation has little influence for cohesive soils, and for practical purposes, a single generalized load‐displacement relationship can be used to represent the available data for all four cases at the 95% confidence level.

Foundation system and derivative bracing system for manufactured building

Abstract: A plurality of spaced, rigid rectangular frames that are vertically adjustable are employed to support manufactured buildings. The frames are formed of pedestals interconnected by vertical trusses. The upper ends of the frames, above the support pedestals are clamped to the flanges of I-beams of the building chassis so as to prevent the building from shifting relative to the foundation.

Shield for building foundation

Abstract: Foundation shield impervious to radon, consisting of a first layer of polymer sheet, a second layer of metal foil, and a third layer of polymer sheet, the three layers being laminated together with the second layer sandwiched between the first and second layers.

Collapsible road barrier

Abstract: A collapsible road barrier comprises a foundation pit, a frame located in the foundation pit, an expandable barrier element mounted in the frame, at least one energy absorption element extending from a rear wall of the foundation pit to a rear side of the frame, and at least one stretching element connected between the front side of the frame and the front wall of the foundation pit, such that vehicle impact against the barrier element will cause the frame to first move towards the rear wall of the foundation pit, causing the energy absorption element(s) to compress and the stretching element(s) to extend and eventually break, and then pivot upwardly to stop the vehicle.

Properties of soft clay under static and cyclic loading

Abstract: This paper presents soil properties for foundation design of structures on soft clay subjected to static and combined static and cyclic loads. The foundation design aspects include bearing capacity, cyclic displacements, equivalent soil spring stiffnesses for use in dynamic structural analyses, soil stresses against structures, and settlements due to cyclic loads. The properties include static, post-cyclic static and cyclic shear strengths and deformation properties, pore pressures generated by cyclic loads, and post-cyclic recompression behaviour. It is shown how these properties can be determined from laboratory tests, and the paper presents numerical values of soil properties from triaxial and direct simple shear tests on Drammen clay. Numerical values of other soft soils are also included in some cases. The laboratory tests on Drammen clay aimed at determining soil properties for foundation design of offshore platforms, but the data can be used in foundation design of structures subjected to cyclic loads in general.

Reinforcement Extensibility in Reinforced Soil Wall Design

Abstract: There are many types of reinforcing materials and systems available for the construction of reinforced soil walls Of the many types, the Reinforced Earth system developed by Vidal (1966) in France has predominated and has provided the basis for most theoretical and empirical knowledge of the behavior of reinforced soil walls The Reinforced Earth system has a number of distinguishing characteristics that include: steel reinforcing elements that have tensile moduli on the order of 2 × 108 kPa (3 × 107 lbs/in2); reinforcing elements that are discrete strips, approximately 50 mm (2 in) wide and 5 mm (02 in) thick; and concrete facing (skin) elements that can individually undergo limited translation and rotation in response to movements in the reinforced fill or settlements of the foundation soils

Scale effects in tests on footings

Abstract: Croucher Foundation, the Committee of Vice-Chancellors and Principals of the Universities of the United Kingdom, and the Cambridge University Engineering Department

Moisture control system for a foundation

Abstract: A moisture control system for controlling the moisture level of subsoil adjacent the foundation of a building in which a supply pipe extends in the subsoil along an area adjacent the foundation and an accumulator pipe is disposed adjacent the supply pipe. A plurality of porous pipes are each connected between the supply pipe and the accumulator pipe and are adapted to allow seepage of water into the subsoil.

Shallow foundation on sand underlain by soft clay with geotextile interface

Abstract: One technique for improving the load-bearing capacity of shallow foundations on soft clay soil is to construct them over a compact granular fill laid over the clay layer. However, the load-bearing capacity can be further increased by placing a geotextile at the interface of the clay layer and the granular fill. A number of model test results relating to the ultimate bearing capacity of a strip foundation on a compact granular fill material (sand) underlain by a soft clay layer with and without the inclusion of a geotextile at the interface have been presented, and the beneficial effects of the geotextile have been determined.

Analysis and Design of Foundations for Vibration

Abstract: A textbook for a graduate course on the aspects of vibrations in foundation engineering. Vibration criteria & theory; Vibration of blocks & beams; Analysis of beams, frames & vibration records; Theoretical solutions for foundation vibration problems; Design of shallow & deep foundations; Measurement of dynamic soil properties; Instrumentation; Isolation techniques; Computer modeling.

Seawater resistant clay mixture

Abstract: A mixture of swellable clay, such as bentonite, is charged with an additive which provides an excess of univalent ions which tend to neutralize the deleterious effects of ions which are naturally present in seawater. The mixture is deposited on and carried by a sheet to facilitate its uses as a pond liner or a foundation sealant.

Air structure protection of cold weather concreting

Abstract: The article describes the use of an air structure to protect cast-in-place concrete construction in cold weather The structure was movable, structurally sound, of low cost, and had standard components, It had a surface area of about 3 acres, and a network of steel cables formed the primary structural element; a synthetic fabric formed the secondary structural element A conventionally reinforced foundation system formed from precast concrete anchor blocks was selected Other details of the structure and its fabrication, inflation, safety, and installation are described It is noted that this is a viable solution for cold weather concreting in Alaska