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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 15 Abstracts search results
Document:
SP285-3
Date:
May 1, 2012
Author(s):
Michael P. McGurl and David W. Johnston
Publication:
Symposium Papers
Volume:
285
Abstract:
Analysis of the construction load distribution during construction of multistory concrete buildings is critical for both construction safety and economy. Recent reduction of load factors used in design of the permanent structure has resulted in less strength availability in the construction stage and need for tools to better support shoring and reshoring analysis. Using the traditional simplified method presented in ACI SP-4 for concrete structures under construction, spreadsheet models have been developed which analyze the distribution of loads based on inputs chosen by the engineer. The models determine the vertical loads resisted by temporary construction systems and the slabs with various combinations of levels of shores and reshores and with mechanical drophead shores. Analysis can be performed using either unfactored or factored loads and using either actual uniform loads or loads expressed as a proportion of slab dead load. The results of the models were validated by comparison with previously published shoring and reshoring analyses. Lastly, a comparison of the loads supported by the individual slabs and the levels of shores in each model during the placement of upper floors is made.
DOI:
10.14359/51683926
SP285-2
Ashok K. Dhingra
This paper describes the planning, design and construction challenges to replace the existing, 80-year-old 14Million Gallons (54.81 Mega liters) Chevy Chase Reservoir and Pumping Station, located in Glendale, California. The existing and new reservoirs were/are fully buried, reinforced concrete structures under a golf course in Chevy Chase Country Club. The new reservoir was built on the footprint of the existing reservoir, on a tight site, involving shoring and stockpile of earth to be utilized for backfill following the completion of the reservoir. The location is in a residential neighborhood along a busy street. There was heavy community involvement and the concrete truck traffic on pour days as well as the rebar deliveries had to be carefully managed during construction. This paper discusses the planning, pre-design, design, constructability review and the construction management including the various QA/QC aspects throughout the project. The inclusion of special provisions for demolition of the existing facilities and other special conditions are addressed. The existing reservoir did not last the anticipated life of 100 years for a buried structure, the lessons learned and how the new ACI 350 code was implemented into the new reservoir design will be discussed. Also, the leakage testing requirements are described. Unforeseen subsurface conditions and unexpected contaminated perched groundwater along with the mitigation methods to improve soil and foundation conditions are discussed. The project was completed in record time, through an incentive clause in the contract documents. The project utilized the existing concrete material by crushing and using it as the sub base of the new reservoir, eliminating the need for hundreds of truck loads of material to be hauled offsite, contributing further to the Owner’s “Green Initiative” and reducing the overall carbon foot print. Several unique features and the overall performance of the project will also be addressed.
10.14359/51683925
SP285-13
Daniel J. McCarthy and Lars F. Balck
The authors provide a history of the seventy year old wire-wrapped circular prestressed concrete tank industry from three perspectives: 1) evolution of key design and detailing practices; 2) durability and performance; and 3) evolution of professional industry standards.
10.14359/51683936
SP285-10
Luke M. Snell
This paper is based on a presentation in honor of Dov Kaminetzky’s long-term interest in how to use reinforcement location techniques in evaluating concrete structures. All methods of locating reinforcement are spot specific and can be used to determine the location of a particular reinforcement. In most cases, the engineer or contractor needs to confidently determine the location of the entire reinforcement system used in a member. This requires a detailed sampling plan to be developed and to use appropriate statistical methods. This paper describes four different reasons why reinforcement may need to be located within a structure and present a statistical method that is appropriate for each of these methods.
10.14359/51683933
SP285-1
Jose M. Izquierdo-Encarnacion
In honor of Dov Kaminetzky, two case stories are discussed; one to reflect his passion for the correct usage and design for concrete and the other his other great passion, the forensic and technical evaluation of existing structures.
10.14359/51683924
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