Shaking table tests on precast reinforced concrete and engineered cementitious composite/reinforced concrete composite frames

Abstract

Engineered cementitious composite is an advanced composite material with strain-hardening and multiple cracking behavior. Substituting conventional concrete with engineered cementitious composite can significantly improve the seismic performance of reinforced concrete structures. This article presents the seismic behavior of a precast engineered cementitious composite/reinforced concrete composite frame and a precast reinforced concrete frame. In the precast engineered cementitious composite/reinforced concrete composite frame, engineered cementitious composite is used to replace concrete in the beam-to-column joints and the bottom columns. The shaking table test results on the two scaled frames are presented. The frame failure characteristics and dynamic properties, including the fundamental frequency, story displacement, inter-story drift, and story acceleration, are comprehensively studied. The test results indicate that the connection method adopted in the tested frames is applicable and reliable. Both of the frames have good seismic performance and can withstand earthquakes at the design seismic intensity. Using engineered cementitious composite in precast frames can greatly reduce damage. The precast engineered cementitious composite/reinforced concrete composite frame has better deformation capacity, better energy dissipation ability, and slower stiffness deterioration than the precast reinforced concrete frame.

Behaviour of Structural Elements Constructed and Rehabilitated With High Performance Concretes

“…The frame elements of the RC structures should be designed to have high ductility and energy absorption capacity especially in the seismic regions. The earthquake-induced damage in the building frame structures can significantly reduce the loadcarrying capacity associated with significant stiffness degradation and decrease in energy dissipation capacity which eventually results in loss of serviceability/functionality with partial or total collapse (Almalkawim et al, 2017;De Risi et al, 2015;Pantelides et al, 2002;Santhi et al, 2005;Shokrabadi and Burton, 2018;Xu et al, 2018;Yu et al, 2019;Kwon et al, 2017;Shokrabadi and Burton, 2018).…”

“…The test results indicated that the use of ECC material in the connection plastic zone as a replacement of normal concrete and partial replacement of transverse reinforcement can significantly enhance the joint shear resistance, energy absorption capacity, and cracking response, thereby, enhancing the joint seismic resistance. Xu et al (2018) investigated seismic behavior of a precast reinforced engineered cementitious composite and conventional reinforced concrete frame. In the precast ECC frame, ECC was used to replace concrete in the beam-to-column joints and the bottom columns.…”

“…Similarly, HPFRCC low-rise walls exhibited drift capacities larger than 2.0% with only minor damage at drifts ranging between 1.0 to 1.5%. Xu et al, (2018) investigated the seismic behaviour of precast RC and ECC composite and reinforced concrete composite frames. The shaking table test performed on the two 1/3 rd scale frame structure where the ECC materials were used in the beam-column connection and bottom columns.…”

Numerical and experimental analysis in seismic performance of post-earthquake reinforced concrete frame retrofitted with ECC

“…Reinforced concrete (RC) frame structures have the advantages of good integrity, high strength and good seismic performance which are widely used in various construction projects (Sosso and Berke, 2023; Xu et al, 2018). However, due to the relatively small lateral stiffness, damage often occurs after strong earthquake actions (Civil et al, 2008; Gong et al, 2013; Kamogawa et al, 2005).…”

Effect of fiber content on mechanical performance and cracking characteristics of ultra-high-performance seawater sea-sand concrete (UHP-SSC)

“…The ductility in concrete can be improved by fiber reinforcement based on the micromechanical design theory (Huang et al, 2018b, 2019a; Li and Leung, 1992; Lin et al, 2018; Yu et al, 2018a, 2018b; Yu et al, 2020a). It has been proven that the resiliency and durability of structural members can be significantly improved by using ductile concrete (Huang et al, 2017a, 2019b, 2019c, 2020; Li, 2019; Li et al, 2016; Lu et al, 2018; Mechtcherine, 2013; van Zijl and Slowik, 2017; Xu et al, 2017). Ultra-high-molecular-weight polyethylene (PE) fibers were widely used in high-tensile-strength ductile concrete (Chen et al, 2018, 2020; Ding et al, 2019; He et al, 2017; Yu et al, 2018d; Zhang et al, 2019b, 2020; Zhou et al, 2019b), and therefore there is a great interest to develop ductile UHP-SSC with PE fibers to avoid the corrosion risk of reinforcing fibers.…”