Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

In practice of construction in Russia in case of plastic soils bedding, the cast-in-place foundations are used, constructed in a compacted base in kind of tamping in the soil of the 2-4 m depth pyramidal holes with the subsequent ballast tamping into the hole bottom and placing concrete in the said hole. Such foundations are advisable under the columns of framed buildings and structures. They are significantly more effective comparing to the pile foundations with a cast-in-place raft, as without a raft the volume of excavation works and formwork decreases significantly. While design of such foundations for the framed buildings and structures, the horizontal load and bending moment calculation is of great importance. According to the above calculation, the horizontal displacements of a foundation and its reinforcing are evaluated. The aim of the given paper is to solve this problem. The complex of the experimental – theoretical investigations has been carried out by a special program and included the horizontal load static tests of the foundations in tamped holes with the parallel CPT. By results of site experiments the rules of deformation of the stressed-deformed state are obtained and the criteria of achieving the limit state of a system “foundation-soil” are revealed. In particular, it was stated that the tamped in ballast creates a zone of an increased strength in a foundation base that prevents its horizontal displacement due to the horizontal load. Based on experimental data, a design scheme was constructed and a method of such foundations horizontal load calculation was worked out including CPT.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Single Foundations of Framed Buildings and Skeleton Structures in a Compacted Base and Their Horizontal Load Resistance

New York, New York

In practice of construction in Russia in case of plastic soils bedding, the cast-in-place foundations are used, constructed in a compacted base in kind of tamping in the soil of the 2-4 m depth pyramidal holes with the subsequent ballast tamping into the hole bottom and placing concrete in the said hole. Such foundations are advisable under the columns of framed buildings and structures. They are significantly more effective comparing to the pile foundations with a cast-in-place raft, as without a raft the volume of excavation works and formwork decreases significantly. While design of such foundations for the framed buildings and structures, the horizontal load and bending moment calculation is of great importance. According to the above calculation, the horizontal displacements of a foundation and its reinforcing are evaluated. The aim of the given paper is to solve this problem. The complex of the experimental – theoretical investigations has been carried out by a special program and included the horizontal load static tests of the foundations in tamped holes with the parallel CPT. By results of site experiments the rules of deformation of the stressed-deformed state are obtained and the criteria of achieving the limit state of a system “foundation-soil” are revealed. In particular, it was stated that the tamped in ballast creates a zone of an increased strength in a foundation base that prevents its horizontal displacement due to the horizontal load. Based on experimental data, a design scheme was constructed and a method of such foundations horizontal load calculation was worked out including CPT.