Experimental Investigation of the Seismic Performance of a Novel Bolt-Assembled Precast Panel Building Structure

2019 ◽  
Vol 13 (03n04) ◽  
pp. 1940008 ◽  
Author(s):  
W. Chen ◽  
F. Xiong ◽  
Y. Lu ◽  
J. Chen ◽  
B. Feng ◽  
...  
Keyword(s):  
Seismic Performance ◽  
Design Theory ◽  
Shear Failure ◽  
Structural Integrity ◽  
Precast Concrete ◽  
Concrete Structures ◽  
Static Test ◽  
Concrete Panels ◽  
Successful Prediction

In this study, the authors investigated the behavior of the proposed bolt-assembled precast panel building (BPPB) system under the simulated seismic loading through a large experimental campaign. A pseudo-static test was carried out on a two-story half-scale building specimen constructed by many individual precast components which were properly joined together with bolted connections. The results show that the building specimen had the good seismic performance with high bearing capacity, comparable energy dissipation capacity and perfect structural integrity. The crack pattern and failure mode of the building specimen are different from those of traditional cast-in-situ concrete structures and equivalent cast-in-situ precast concrete structures. The final damage was concentrated in the bolted joint zones, a shear failure occurred in the edge of concrete panel near the bolt holes. It results in that the traditional design approaches of concrete shear wall cannot be applied to this new system. Therefore, the design philosophy and design formulas were proposed for the bolt-connected precast concrete panels to ensure the ductility of the panels and further improving the seismic performance of the BPPB system. The design theory of the bolt-connected precast concrete panels was validated by the successful prediction of the building specimen’s flexural capacity.

Connections in Precast Concrete Elements

2016 ◽  
Vol 691 ◽  
pp. 376-387 ◽  
Author(s):  
Ivan Hollý ◽  
Ivan Harvan
Keyword(s):  
Structural Integrity ◽  
Precast Concrete ◽  
Concrete Structures ◽  
Structural Elements ◽  
Entire Structure ◽  
Engineering Department ◽  
Final Design ◽  
Structural Engineer ◽  
Concrete Elements

The structural integrity of precast concrete structures depends mainly on the connections between the precast structural elements. The purpose of a connection is to transfer loads, restrain movement, and/or to provide stability to a component or an entire structure. Therefore, the design of connections is one of the most important aspects in the design of precast concrete structures. All connections should design with valid codes. Every precasters have developed connection details over the years that suit their particular production and erection preferences. It is common, that the structural engineer to show loads and connection locations and allow the successful manufacturer’s engineering department to provide the final design and details of the connections.

scholarly journals Experimental Study on Seismic Behavior of Precast Frame Columns with Vertical Reinforcement Spliced with Grouted Sleeve Lapping Connectors

2021 ◽  
Vol 2021 ◽  
pp. 1-21
Author(s):  
Qiong Yu ◽  
Liang Zhang ◽  
Shaohua Bai ◽  
Baoxiu Fan ◽  
Zhenhai Chen ◽  
...  
Keyword(s):  
Seismic Performance ◽  
Failure Modes ◽  
Precast Concrete ◽  
Hysteresis Loops ◽  
Concrete Columns ◽  
Type I ◽  
Type Ii ◽  
Force Transfer ◽  
Steel Sleeve

Grouted splice connector is widely employed in precast concrete structures, but its utilization is still limited by shortcomings such as high construction cost, inconvenience in assemblage, and uncompacted grout caused by its small sleeve diameter. The grouted sleeve lapping connectors proposed by the authors can not only provide reasonable force transfer and convenient construction processing but also have the characteristics of low price and easy grouting. In this paper, the seismic performance of two full-scale precast concrete columns with two types of grouted sleeve lapping connectors was investigated, where type-I connector connected two lapped rebars and type-II connector connected four lapped rebars by a steel sleeve, respectively. A cast-in-situ column was also tested as a reference. All the specimens were tested under reversed cyclic horizontal load with a constant axial force. The distribution of cracks, failure modes, loading capacities, deformation abilities, stiffness, ductility, hysteresis loops, and energy dissipation of the specimens were studied. The type-I and type-II grouted sleeve lapping connectors satisfactorily transferred the stress of rebars when the columns reached their ultimate loads, and the seismic performance of the precast concrete columns was found to be comparable to that of the cast-in-situ column. Thus, the grouted sleeve lapping connector has a potential to replace the grouted splice connector in cast-in-situ connection.

scholarly journals Service Life Prediction of Precast Concrete Structures Exposed to Chloride Environment

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Dawei Zhang ◽  
Yu Zeng ◽  
Mingshan Fang ◽  
Weiliang Jin
Keyword(s):  
Shear Failure ◽  
Precast Concrete ◽  
Probability Model ◽  
Limit State ◽  
Concrete Structures ◽  
Seismic Load ◽  
Ultimate Limit State ◽  
Interface Shear ◽  
Serviceability Limit State ◽  
Corrosion Initiation

Chloride-induced corrosion is widely accepted as one of the primary causes of premature deterioration for concrete structures in marine or deicing salt environment. For precast concrete (PC) structures, such durability problems may even be severer because defects in joint areas, e.g., cracks caused by grout shrinkage and improper construction, can accelerate chloride ion transportation process and may cause the interface shear failure when subjected to seismic load. By applying the path probability model (PPM) and reliability theory, a probabilistic framework was proposed to predict three limit states of PC structures, including corrosion initiation, serviceability limit state, and ultimate limit state. Using Monte Carlo simulation, a beam-to-column joint was further analyzed to illustrate the differences between PC structures and those cast in situ. The analysis indicates that corrosion initiation and serviceability limit state are sensitive to chloride diffusivity at connection area, and the higher pitting factor can significantly influence the bearing capacities of PC structures.

scholarly journals Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing Conditions

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3179 ◽  
Author(s):  
Gaowen Zhao ◽  
Mei Shi ◽  
Mengzhen Guo ◽  
Henghui Fan
Keyword(s):  
Degradation Mechanism ◽  
Precast Concrete ◽  
Concrete Structures ◽  
Degradation Process ◽  
Sulfate Attack ◽  
Curing Conditions ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Chemical Attack

Sulfate induced degradation of concrete brings great damage to concrete structures in saline or offshore areas. The degradation mechanism of cast-in-situ concrete still remains unclear. This paper investigates the degradation process and corresponding mechanism of cast-in-situ concrete when immersed in sulfate-rich corrosive environments. Concrete samples with different curing conditions were prepared and immersed in sulfate solutions for 12 months to simulate the corrosion of precast and cast-in-situ concrete structures, respectively. Tests regarding the changes of physical, chemical, and mechanical properties of concrete samples were conducted and recorded continuously during the immersion. Micro-structural and mineral methods were performed to analyze the changes of concrete samples after immersion. Results indicate that the corrosion process of cast-in-situ concrete is much faster than the degradation of precast concrete. Chemical attack is the main cause of degradation for both precast and cast-in-situ concrete. Concrete in the environment with higher sulfate concentration suffers more severe degradation. The water/cement ratio has a significant influence on the durability of concrete. A lower water/cement ratio results in obviously better resistance against sulfate attack for both precast and cast-in-situ concrete.

scholarly journals Numerical Study on Seismic Behavior of Underwater Bridge Columns Strengthened with Prestressed Precast Concrete Panels and Fiber-Reinforced Polymer Reinforcements

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Yu Tang ◽  
Gang Wu ◽  
Zeyang Sun
Keyword(s):  
Seismic Performance ◽  
Precast Concrete ◽  
Expansion Ratio ◽  
Bridge Columns ◽  
Modeling Method ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Residual Displacement ◽  
Concrete Panels ◽  
Reinforced Polymer

The seismic performance of the bridge column, such as pier or pile, is a time-dependent property which may decrease in resistance to the deterioration or natural hazards along the structure’s service life. The most effective strengthened method for degraded bridge columns is the jacketing method, which has been widely developed and investigated through numerous studies since the 1980s. This paper presented a modeling method, as well as a comprehensive parametric study, on seismic performance of bridge columns strengthened by a newly developed strengthening method with prestressed precast concrete panels and fiber-reinforced polymer reinforcements (PPCP-FRP). A modeling method of bridge columns strengthened with PPCP-FRP was first presented and validated with test results. The influence of design parameters, such as axial load ratio, equivalent FRP reinforcement ratio rate (EQFRR), expansion ratio, and shear span ratio of strengthened columns, were then further evaluated in terms of lateral load capacity, ductility, energy dissipation, lateral stiffness, and residual displacement of strengthened columns. The peak load of strengthened columns increases with the increasing of EQFRR due to the unique failure model of strengthened columns characterized by the fracture of FRP bars. The initial stiffness of strengthened columns increased by 300% with the increasing of expansion ratio by 45%, and a stable postyield stiffness stage was obtained by most strengthened columns in analysis. The residual displacement of strengthened columns decreases rapidly with the increasing of EQFRR, which indicated that a better repairability could be achieved by the strengthened column with a relatively high EQFRR.

scholarly journals Hysteretic Response of Tilt-Up Concrete Precast Walls with Embedded Steel Plate Connections

2020 ◽  
Vol 12 (19) ◽  
pp. 7907
Author(s):  
Hyun-Do Yun ◽  
Hye-Ran Kim ◽  
Won-Chang Choi
Keyword(s):  
Prestressed Concrete ◽  
Structural Integrity ◽  
Precast Concrete ◽  
American Concrete Institute ◽  
Steel Plates ◽  
Test Results ◽  
Wall Panel ◽  
Concrete Wall ◽  
Concrete Panels ◽  
Wall Panels

Many connection systems are available that can transfer tension and shear loads from a precast concrete wall panel to a floor slab. However, due to the insufficient anchor depth in relatively thin precast concrete panels, it is difficult to attain adequate ductility and stiffness to ensure structural integrity. Based on the authors’ previous research results, the supplementary reinforcement of embedded steel plates in precast concrete wall panels can enhance stiffness while maintaining allowable displacement and ductility. In this study, three full-size tilt-up precast concrete panels with embedded steel plates were fabricated. Lateral cyclic loads were applied to full support structures consisting of a precast concrete wall panel and a foundation. The test results were compared with the results predicted using existing code equations found in the American Concrete Institute 318-14 and the Prestressed Concrete Institute Handbooks. The test results confirm that the supplementary reinforcement of thin precast concrete wall panels can provide (i) the required strength based on current code equations, (ii) sufficient ductility, and (iii) the energy dissipation capacity to resist cyclic loading.

Seismic performance comparison between precast beam joints and cast-in-place beam joints

2016 ◽  
Vol 20 (9) ◽  
pp. 1299-1314 ◽  
Author(s):  
Hongtao Liu ◽  
Qiushi Yan ◽  
Xiuli Du
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Plastic Zone ◽  
Axial Compression ◽  
Seismic Performance ◽  
Compression Ratio ◽  
Precast Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Axial Compression Ratio

Precast reinforced concrete structures are widely used due to many constructional advantages such as faster construction speed, lower construction cost, being environmentally friendly, higher strength, and so on. To study the seismic performance of precast reinforced concrete structures, tests on beam-to-column joints of precast reinforced concrete structures were conducted under low reversed cyclic loading. In total, four joint specimens were produced in this study, including two precast joints and two cast-in-place joints. In addition to the comparison between different types of joints, the axial compression ratio of column was adopted as the main variable in this study. Analysis was carried out on the basis of the observed joint failure mode and relationships derived from the test data such as hysteresis curves, skeleton curves, stiffness degradation curves, energy dissipation capacities, and sleeve joint strain curves. Despite the closeness of energy dissipation capacity between the precast joints and the cast-in-place joints, they had different failure modes. Precast joints feature a relatively concentrated crack distribution in which the limited number of cracks was distributed throughout the plastic zone of the beam. Cast-in-place joints feature more evenly distributed cracks in the plastic zone, especially at the later stage of the loading. The steel slippage of the precast concrete joints was found influenced by the axial compression ratio. Through this study, it is concluded that seismic resistance capacity of precast concrete joint needs to be considered in design and construction and the grouting sleeve splice could be kept away from the hinge zones when precast concrete structures were used in regions of high seismicity. The results in this study can provide a theoretical basis for seismic design of precast reinforced concrete structures, which in turn can promote the application of precast reinforced concrete structures.

Research on Performance of Precast Two-Way Hollow Slab Shear Wall with Cast-In Situ Boundary Elements

2013 ◽  
Vol 477-478 ◽  
pp. 655-659
Author(s):  
Hui Chen Cui ◽  
Ji Liang Liu ◽  
Ming Jin Chu
Keyword(s):  
Seismic Performance ◽  
Shear Failure ◽  
Boundary Elements ◽  
Shear Wall ◽  
Failure Characteristics ◽  
New Type ◽  
Loading Tests ◽  
Rc Shear Wall ◽  
Cyclic Loading Tests

Low cyclic loading tests were carried out for one precast two-way hollow slab shear wall with cast-in-situ boundary elements and one RC shear wall. The seismic performance of precast two-way hollow slab shear wall was analyzed. The test results indicated that macroscopic vertical cracks appeared along precast slab vertical holes of precast two-way hollow slab shear wall. The failure characteristics of the precast two-way hollow slab shear wall were significantly different from that of the reinforced concrete shear wall. Shear failure could be avoided and seismic performance of the new type shear wall was good.

Connections and Joints in Precast Concrete Structures

2020 ◽  
Vol 28 (1) ◽  
pp. 49-56
Author(s):  
Ivan Holly ◽  
Iyad Abrahoim
Keyword(s):  
Structural Integrity ◽  
Precast Concrete ◽  
Concrete Structures ◽  
Structural Elements ◽  
Entire Structure ◽  
Engineering Department ◽  
Final Design ◽  
Structural Engineer ◽  
Internal Forces

AbstractThe structural integrity of precast concrete structures mainly depends on the connections between the precast structural elements. The purpose of a connection is to transfer loads, restrain movement, and/or to provide stability to a component or an entire structure. Therefore, the design of connections is one of the most important aspects in the design of precast concrete structures. All the connections should be designed according to the valid codes. All precasters have developed connection details over the years that suit their particular production and erection preferences. It is common that the structural engineer shows the internal forces and connection locations, and the manufacturer’s engineering department provides the final design and details of the connections. This paper describes basic types of connections and joints used in precast concrete structures

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