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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 16 Abstracts search results
Document:
SP90-07
Date:
April 1, 1986
Author(s):
Raymond A. Jurewicz.
Publication:
Symposium Papers
Volume:
90
Abstract:
Personal injury due to construction accidents inflict pain and suffering on the hapless victim and costs the construction industry billions of dollars annually. Recognizing the hazards and utilizing practical solutions can reduce this human and monetary waste. This paper deals with formwork safety from the view of working conditions and the necessary work operations that must be accomplished to install and strip formwork. It does not deal with formwork failures or the causes of these failures. The paper covers general hazards as well as the specific hazards associated with various formwork systems. Solutions to minimize risks associated with the various hazards are recommended. Various ways to develop safety awareness are also discussed.
DOI:
10.14359/1771
SP90-09
John L. Gross and H. S. Lew
This paper describes a microcomputer-based program which can be used to assist the contractor in evaluating the safety and economy of alternate construction schemes in cast-in-place multistory concrete building construction. The program, developed at the National Bureau of Standards, assumes that the slabs are supported by evenly distributed, compressible shores or reshores. Forces on the slabs are computed by assuming that superimposed construction loads are distributed to the shoring system and interconnected floors in proportion to their relative stiffnesses. The method takes into account both the stiffness of shores and reshores and any precompression in the reshores. Slab capacity is computed from a maturity-based model of concrete strength prediction. The computed slab loads are compared with the slab capacities to determine whether the load on any slab exceeds the capacity of that slab for any stage of construction. By varying the number of shored and reshored stories, the precompression of reshores, and rate of construction, the optimum casting schedule can be determined. Examples are given which illustrate how this program can be used to assist the contractor in determining a safe casting schedule and to guide the contractor in formwork removal.
10.14359/1772
SP90-08
M. K. Hurd and P. D. Courtois
Presents a basic analytical method for shoring and re-shoring loads of multistory buildings. Discusses the factors that must be considered, the assumptions for simplification of the analysis and shows the method for determining the estimated loads that will be transferred to the structure. Presents the procedure required to determine the ability of the structure to resist the estimated loads with an appropriate safety factor and the adjustments to the construction procedure that must be made in the event the applied loads are in excess of the capacity of the structure.
10.14359/10061
SP90-10
W.. Thomas Scott
As the speed of construction of concrete frame structures has increased and the sophistication of design has improved, there has been an increased need for a more thorough understanding as to the way construction loads are disbursed into the structure. During the 60's and 70's, several designers and researchers proposed methods of analyzing the loads in multistory structures during construction. A computer program employing one of these methods has been developed. In the 1982 PCA conference the author used the results of this proqram to show how the number of levels of equipment, cycle time, and attained concrete strength affected the number of levels of reshores required. This paper describes in detail the process used to calculate the reshorinq requirements for a 35 story flat plate structure built using a three day construction cycle. The discussion includes the practical implications of providing reshorinq for a mild steel structure. The hand calculation procedure presented parallels the computer program and is sufficiently detailed to provide the reader a practical procedure that can be used on the next project.
10.14359/10062
SP90-01
Russel S. Fling
Economy in concrete construction is discussed in light of 3 challenges: 1) the challenge of economizing design, 2) the challenge of economizing construction, and 3) the challenge of standardizing construction. Procedures engineers may use to reduce the cost of construction are given. Suggestions for standardizing concrete construction include standards for concrete classes, column sizes, column spacing, column capitals, and tolerances.
10.14359/1765
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