Hysteretic behavior of composite bridge columns with plastic hinge enhanced by engineered cementitious composite jacket for seismic resistance

Engineered cementitious composite is a class of high-performance cementitious composites with pseudo-strain hardening behavior and excellent crack control capacity. Substitution of concrete with engineered cementitious composite can greatly reduce the cracking and durability problems associated with low tensile strength and brittleness of concrete and can significantly increase structural seismic resistance. In this article, a pair of beam–column joints with various matrix types has been tested under reversed cyclic loading to study the effect of substitution of concrete with engineered cementitious composite in the joint zone on the seismic behaviors of composite members. After that, a simplified constitutive model of engineered cementitious composite under cyclic loading is proposed, and the structural performance of steel reinforced engineered cementitious composite members is simulated by fiber beam elements. The accuracy of the model is verified with test data. Finally, three frame structures with different matrixes subjected to earthquake actions were numerically modeled to verify the contribution of ductile engineered cementitious composite material to structural seismic resistance. The seismic responses or failure mechanisms, deformation patterns, and energy dissipation capacities for each frame structure are analyzed and compared. The simulation results indicate that the application of engineered cementitious composite can reduce the maximum story drift ratio, and the distributions of the dissipated energy are more uniform along the building height when engineered cementitious composite is strategically used in ground columns and beam–column joints of the frame structure. The seismic performance of the reinforced engineered cementitious composite-concrete composite frame is found to be even better than the frame with all concrete replaced by engineered cementitious composite.

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Cyclic Behavior of Fiber Reinforced Polymer-Encased Engineered Cementitious Composite for Bridge Columns

Structures Congress 2010 ◽

10.1061/41130(369)167 ◽

2010 ◽

Cited By ~ 2

Author(s):

Pedram Zohrevand ◽

Amir Mirmiran

Keyword(s):

Bridge Columns ◽

Fiber Reinforced Polymer ◽

Cyclic Behavior ◽

Cementitious Composite ◽

Fiber Reinforced ◽

Engineered Cementitious Composite ◽

Reinforced Polymer

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Feasibility Study of Using Engineered Cementitious Composite and High-Strength Bars in Rigid Bridge Piers Based on Seismic Vulnerability Analysis

Shock and Vibration ◽

10.1155/2020/8850800 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Jie Li ◽

Yuanhong Hu ◽

Dayu Yang ◽

Tengda Feng ◽

Yan Liang ◽

...

Keyword(s):

Seismic Performance ◽

Seismic Vulnerability ◽

Plastic Hinge ◽

High Strength ◽

Vulnerability Analysis ◽

Bridge Piers ◽

Main Function ◽

Cementitious Composite ◽

Engineered Cementitious Composite ◽

Seismic Vulnerability Analysis

The main function of pier is to transmit the load from superstructure to foundation reliably. Under earthquake action, the main failure reason of bridge is the damage of bridge pier. The application of some high-performance materials is helpful to improve the seismic performance of bridge piers. Based on seismic vulnerability analysis, this paper studies the feasibility of using engineered cementitious composite (ECC) and high-strength bars in bridge piers. Taking a rigid pier as an example, a nonlinear numerical model is established by OpenSees software. The reasonable replacement height of ECC in plastic hinge regions, stirrup ratio of pier section, and replacement rate of high-strength bars are obtained through the seismic performance analysis of the pier. Then, seismic vulnerability of rigid pier with ECC and high-strength bars is analyzed. The results show that it is feasible to improve the seismic performance of the piers by using ECC and high-strength bars. Considering the economic rationality, the replacement height of ECC in plastic hinge regions can be determined according to the curvature change point. For the rigid pier, the economical and reasonable volume stirrup ratio is 0.78%. The ultimate curvature of RC/ECC pier bottom increases by 12.4% when the longitudinal bars of the pier are replaced by high-strength bars, and the energy dissipation capacity increases by 22.5% on average. Compared with the pier’s original design, the exceedance probability of each limit state of the rigid pier with ECC and high-strength bars is significantly reduced. Its seismic performance is superior, and the risk of seismic damage is significantly reduced.

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