scholarly journals Progress report on cyclic load tests on prestressed partially prestressed and reinforced concrete interior beam-column assemblies

Author(s):  
R. Park ◽  
K. J. Thompson

The University of Canterbury is at present conducting an experimental investigation into the seismic resistance of concrete building frames. This research project is sponsored by the N.Z. Prestressed Concrete Institute, the Building Research Association (NZ) and the University. The test frames include a range of proportions of prestressing steel and ordinary reinforcing steel to allow a comparison of prestressed and reinforced concrete frames and to establish the possible advantages
of combining both systems. The tests are aimed at determining the deformation capacity and degree of damage of such frames when responding to severe seismic load reversals and will establish further basic information for the evaluation and design
of framed structures for earthquake resistance. The specimens consist of beam-column assemblies with either a prestressed, partially prestressed or reinforced concrete beam. This paper summarizes the results obtained from the first eight test units. The results from the first seven units may be seen reported in more detail elsewhere.

Author(s):  
R. Park ◽  
K. J. Thompson

The University of Canterbury is at present conducting an experimental investigation into the seismic resistance of concrete building frames. This research project is sponsored by the N.Z. Prestressed Concrete Institute, the Building Research Association (N.Z.) and the University. The test frames will include a range of proportions of prestressing steel
and ordinary reinforcing steel to allow a comparison of prestressed and reinforced concrete frames and to establish the possible advantages of combining both systems. The tests are aimed at determining the deformation capacity and degree of damage of such frames when responding to severe seismic load
reversals and will establish further basic information for the evaluation and design of framed structures for earthquake resistance. Testing of the first test specimen has been completed. The specimen (Unit 1) consisted of
a beam-column assembly with a prestressed concrete beam. After testing under very severe seismic type loading the damaged concrete was repaired and the assembly retested. This
 report summarizes the results obtained from
the tests on that specimen.


1979 ◽  
Vol 6 (3) ◽  
pp. 343-354
Author(s):  
Marc Thenoz ◽  
Claude Bidaud

This paper presents the electronic computer programmes used for the design of standard bridge superstructures by the SETRA (Service d'Etudes techniques des Routes et Autoroutes) of the French Department of Public Works. There is one particular programme for each bridge type. Through these programmes, concrete widths and depths and steel reinforcement are calculated for reinforced concrete beam and slab bridges, and prestressing is designed for prestressed concrete beam and slab bridges.Since February 1, 1962, 11 000 bridges have been designed with these varied and general programmes, suitable for most standard road and freeway overpasses. [Journal translation]


Author(s):  
Minehiro Nishiyama

The current seismic design procedure for prestressed concrete buildings in Japan is described. The design seismic loads for prestressed concrete buildings provided in NZS 4203:1984 are compared with those in the corresponding Japanese code. Comparisons between prestressed concrete and ordinary reinforced concrete buildings are discussed with regard to design seismic load, dynamic response during earthquake motions and the performance of beam-column joints under reversed cyclic loading. The results of several tests are summarised.


Author(s):  
K. E. Williamson

This paper is reproduced from the proceedings of a seminar on "Seismic Problems in Structural Engineering" arranged by the Departments of Civil Engineering and Extension Studies of the University of Canterbury, and held in Christchurch from May 13 
to 16, 1968. Another paper from that seminar, also published 
in this issue of the Bulletin, discusses requirements for ductility in reinforced concrete structures. The present 
paper makes a comparison of prestressed concrete with reinforced concrete, and discusses the factors to be considered 
in the design of prestressed structures for earthquake resistance.


2020 ◽  
Vol 8 (4) ◽  
Author(s):  
Basem Abdelwahed ◽  

Reinforced concrete frames are commonly used systems in buildings. The philosophy behind the proper design for this type of frames is to provide them with sufficient ductility. The structural ductility of a frame is mainly determined by the ductility of its components, i.e., the beams, columns, and joints forming this frame. Beam-column joint role in a building is to connect its components together and enable these components to reach their ultimate resistance. Its stiffness, strength, and ductility are key characteristics needed to guarantee efficient building behaviour under the action of different loads. Previous research attributed some building’s damage to inadequate reinforcement details of its joints. Deficiency in joints performance is related to inadequate codes guidelines or to bad construction practice. This paper reviewed the provisions of three different codes (ACI 318-08, Eurocode 8, and ECP-203) concerning the proper design and detailing of different joints. This review study aims to introduce a wider overview on the assessment of joints performance in buildings under different loading scenarios. This data base will enable practicing engineers to identify the joint key parameters with providing different analytical procedures. This study investigates joints in different configurations. These include planner joints, joints with transverse beams, and the common joint situation with the presence of both transverse beams and slab. This survey includes experimental and analytical representation of the previous mentioned joints. Different retrofitting schemes are presented as well for every considered joint. This review allows to identify the evolution of joints capacity in function of reinforcement detailing, level of axial stresses, and loading history. The analysis shows that a decrease in joint resistance can be recovered by using i) haunches brackets, ii) FRP, or iii) post tension metal strip.


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