scholarly journals Performance of a Ductile Hybrid Post-Tensioned Beam-to-Column Connection for Precast Concrete Frames under Seismic Loads: A Review

2021 ◽  
Vol 11 (16) ◽  
pp. 7497
Author(s):  
Khaleel Mohammed ◽  
M Jameel ◽  
Zainah Ibrahim ◽  
Chee Tan
Keyword(s):  
Precast Concrete ◽  
Nonlinear Behavior ◽  
Initial Position ◽  
Frame Structures ◽  
Seismic Loads ◽  
Restoring Force ◽  
Concrete Frame ◽  
Tension And Compression ◽  
Post Tensioning ◽  
Post Tensioned

The performance of precast concrete frame structures against seismic loads mainly depends on the beam-to-column connection. A ductile hybrid connection consists of unbonded post-tensioning steel and bonded reinforcement bars, both of which provide overall moment resistance to the frame. Post-tensioning steel acts as a restoring force which brings the structure back to its initial position upon unloading. Mild steel acts as an energy dissipator which yields in tension and compression. To evaluate the performance of precast frame structures, the structural engineer requires extensive knowledge of the complex nonlinear behavior of the connection. Standardization to mass produce is one of the benefits of precast construction, but with standardization in design there is severe risk. All previous earthquakes have clearly shown that continuous repetition of accepted practice without proper engineering review can lead to disaster. It is important to understand how different parameters of the connection influence the behavior and performance of the frame against seismic loads. The present study helps structural engineers and researchers with a detailed review of hybrid post-tensioned connections. This review is focused mainly on precast beam-to-column connections, studies on the development of hybrid connections, performance evaluations of hybrid connections, and the performance evaluation of precast frames with hybrid connections.

Dynamic load test on progressive collapse resistance of fully assembled precast concrete frame structures

2020 ◽  
Vol 214 ◽  
pp. 110675 ◽  
Author(s):  
Yun Zhou ◽  
Xiang Hu ◽  
Yilin Pei ◽  
Hyeon-Jong Hwang ◽  
Taiping Chen ◽  
...  
Keyword(s):  
Dynamic Load ◽  
Progressive Collapse ◽  
Precast Concrete ◽  
Load Test ◽  
Frame Structures ◽  
Concrete Frame ◽  
Collapse Resistance ◽  
Dynamic Load Test

Literature Review of Precast Concrete Frame Structures in Civil Engineering

2012 ◽  
Vol 568 ◽  
pp. 3-6
Author(s):  
Ke Wei Ding ◽  
Xiang Zhang
Keyword(s):  
Literature Review ◽  
Seismic Behavior ◽  
Civil Engineering ◽  
Precast Concrete ◽  
Engineering Application ◽  
Frame Structure ◽  
Frame Structures ◽  
Structure System ◽  
Concrete Frame ◽  
Performance Research

As construction industrialization is springing up in our country, precast concrete frame structure,as a result,has been developing rapidly. Based on a host of articles about precast concrete frame structure system at home and abroad,it,in this paper,summarized and prospected the latest stress performance research of precast concrete frame structure and up-to-date engineering application. Further more, total assembled node and seismic behavior of precast concrete frame structure is also pointed out as what is needed to study in the future.

ENERGY DISSIPATION IN POST-TENSIONED SELF-CENTERING PRECAST CONCRETE CONNECTIONS WITH A FRICTION DEVICE

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Takeaki Koshikawa
Keyword(s):  
Energy Dissipation ◽  
Friction Force ◽  
Precast Concrete ◽  
Design Parameters ◽  
Effective Energy ◽  
Energy Dissipation Capacity ◽  
Post Tensioning ◽  
The Moment ◽  
The Relationship ◽  
Post Tensioned

This paper presents an analytical study on the energy dissipation capacity of unbonded post-tensioned self-centering precast concrete beam-column connections that have a friction device only below the beam or on the web. The energy dissipation capacity is quantified using an effective energy dissipation ratio. To quantitatively evaluate the influence of three design parameters on the energy dissipation capacity, nonlinear analyses were carried out using a section-analysis method to predict the relationship between the moment and the relative rotation at the beam-column interface under cyclic loading. The design parameters were the initial post-tensioning force in the unbonded post-tensioning tendon, the friction force, and the location of the friction device. The analysis results show that the effective energy dissipation ratios for connections whose friction devices are in the same location can be related to the ratio of the friction force to the initial post-tensioning force.

scholarly journals Assessment of Reinforced Concrete Half Joint According to EN-1992-1-1

2016 ◽  
Vol 5 (1) ◽  
pp. 1-7
Author(s):  
Xhemishir Mulliqi
Keyword(s):  
Reinforced Concrete ◽  
External Force ◽  
Frame Structures ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Prestressing Force ◽  
Rc Structure ◽  
Floor Structure ◽  
Reinforced Concrete Frame Structures ◽  
Post Tensioned

A half-joint is a particular type of RC structure .When using precast beams in reinforced concrete frame structures, dapped beams ends are often required in the bearing area to keep the floor structure as thin as possible. The arrangement and detailing of the reinforcement is an important factor in the performance of a half-joint. For pre-tensioned members, the prestressing force and tendons should be ignored, but for post-tensioned members the prestressing force should be considered as an external force acting on the half-joint. This paper aims to calculate dapped beam ends according to the EN 1992-1-1.

Robustness-oriented conceptual design of precast concrete frame structures

2021 ◽  
Author(s):  
Simone Ravasini ◽  
Beatrice Belletti ◽  
Emanuele Brunesi ◽  
Roberto Nascimbene ◽  
Fulvio Parisi
Keyword(s):  
Conceptual Design ◽  
Precast Concrete ◽  
Frame Structures ◽  
Concrete Frame

Study on seismic behavior reduction of typical joints for monolithic precast concrete frame structures with ages

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Qidi Zhong ◽  
Jianguo Ding ◽  
Xiangxiang Zhang ◽  
Yin Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Constitutive Model ◽  
Service Time ◽  
Precast Concrete ◽  
Time Dependent ◽  
Frame Structures ◽  
Content Type ◽  
Concrete Frame ◽  
Nonlinear Springs

PurposeMonolithic precast concrete frame structures have been promoted and developed in recent years. Owing to material deterioration and a weaker structural integrity, monolithic precast concrete frame structures may suffer from insufficient seismic capacity as service time increases. A typical joint of monolithic precast concrete frame structure is studied in this paper. The purpose of this paper is to perform numerical modeling of the typical joint subjected to low cyclic load at different ages and analyze the hysteretic behavior reduction with ages under common atmosphere environment.Design/methodology/approachExisting un-carbonated concrete, carbonated concrete and corroded rebar are all considered as deterioration factors for the typical joint, whose constitutive models are introduced into the finite element model to study. Moreover, time-dependent constitutive model of existing un-carbonated concrete and mechanical model of bond between precast and cast-in-place concrete are established on the basis of existing experimental data. Then, finite element method is used to investigate the seismic property reduction of the typical joint, where nonlinear springs are set to simulate bonding between precast and cast-in-place concrete.FindingsAnalyzing the results, the reduction of reaction force from skeleton curves of the joint is significant in the first 30 years of service time, and slows down after 30 years. Besides, the ductility, secant stiffness and equivalent viscous damping coefficient of the typical joint remain almost unchanged in the first decade, but decrease obviously after 10 years.Originality/valueThe originality of the paper consists in the following. The time-dependent constitutive model of existing un-carbonated concrete is established and used in finite element method. Besides, bonding between precast and cast-in-place concrete is considered using nonlinear springs. There is a reference value for the seismic performance assessment of existing monolithic precast concrete frame structures.

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