Seismic fragility analysis of two-story ultra-high ductile cementitious composites frame without steel reinforcement

Abstract

<jats:p> This article numerically studies the seismic vulnerability of the frame structure made of ultra-high ductile cementitious composites without longitudinal and transverse reinforcement. A non-linear finite element model is established with the help of Open System for Earthquake Engineering Simulation and calibrated by shaking table test results on an ultra-high ductile cementitious composite-RC frame whose seismic vulnerable parts were replaced by ultra-high ductile cementitious composites without steel reinforcement. Subsequently, an analysis on the structural seismic vulnerability is performed on pure ultra-high ductile cementitious composite frame structure based on the incremental dynamic analysis method. Finally, a seismic vulnerability matrix of the ultra-high ductile cementitious composite frame under various structural limit states is obtained from seismic fragility curves. Under the major earthquake of magnitude 7.5, the probability of ultra-high ductile cementitious composite frame structure under basically intact, slight damage, moderate damage, serious damage, and collapse is 14.2%, 48.1%, 31.7%, 5.3%, and 0.7%, respectively. The achieved results also demonstrate that the ultra-high ductile cementitious composite frame can satisfy the objectivity of “No collapsed under major earthquake” at least for major earthquakes of magnitude 8. It is demonstrated that the ultra-high ductile cementitious composite frame satisfies three-level performance objectivity stipulated in GB 50011-2010 and, thus, preliminarily verifying the feasibility for constructing structures just using high-performance concrete. </jats:p>

Shaking table tests on a 5-storey unreinforced masonry structure strengthened by ultra-high ductile cementitious composites

“…Yu et al [22][24] developed a new-type of ECC that offers a superior tensile strain capacity (i.e., more than 5%), called ultra-high ductile cementitious composites (UHDCC). Experimental and analysis results showed that UHDCC can effectively strengthen reinforced concrete structures [25] [26]. The application of UHDCC to strengthen multi-storey unreinforced masonry structures is yet to be investigated.…”

The effect of vertical near-field ground motions on the collapse risk of high-rise reinforced concrete frame-core wall structures

“…Seismic evaluation and fragility analysis of various RC structures have been the main objective of many studies, yet the inclusion of vertical ground shaking has not been usually considered (Anwar et al, 2020; Boushehri et al, 2020b; Dong et al, 2020; Fang et al, 2018; Farsangi et al, 2014; Hashmi and Madan, 2020; Sfahani et al, 2015; Tafti et al, 2020). Besides, studies have been done on the site response analysis and soil-structure interactions, yet mostly the horizontal excitations have been taken into account (Boushehri et al, 2020a; Zogh et al, 2021).…”