Numerical investigation on dynamic performance of reinforced ultra‐high ductile concrete–ultra‐high performance concrete panel under explosion

Abstract

Ultra-high ductile concrete (UHDC) is known for ultra-high tensile ductility, and ultra-high performance concrete (UHPC) has ultra-high compressive strength. Reinforced UHDC-UHPC panels that are made of UHDC and UHPC (i.e., hybrid panels) are expected to have excellent blast-resistance capacity.However, only limited research is devoted to study the dynamic performance of the panels under explosion. To further investigate the dynamic performance of such kind of composite structural system, numerical simulations are carried out through LS-DYNA. The developed material models are used for describing the mechanical properties of UHDC, UHPC and steel bars at high strain rate.Based on the corresponding field blast test results, the feasibility and accuracy of the adopted finite element models are validated. Furthermore, parameter analysis is applied for investigating the effects of scale distance, reinforcement ratio and concrete type on the dynamic performance. It is concluded that the maximum deflection of reinforced UHDC-UHPC panels reduces with increasing scale distance and reinforcement ratio. Reinforced UHDC-UHPC panels possess excellent blast-resistance capacity in comparison with reinforced concrete panels.

Enhancing Performance of Engineering Structures under Dynamic Disasters with ECC–FRP Composites: A Review at Material and Member Levels

“…In recent years, members strengthened with an ECC layer have been extended to the dynamic field to satisfy the requirements of engineering structures in resisting dynamic loadings such as impact or blast. Commonly employed strengthening methods involve applying compressive or tensile strengthening to the top and bottom surfaces of the structure [64][65][66][67][68][69][70][71][72][73][74]. The fibers in the ECC layer not only improve the ductility of the layer but also increase its energy absorption capacity.…”

“…Moreover, for members with the same thickness of the strengthening layer, slabs strengthened on both sides performed better than those strengthened on the back side only. Liao et al [73,74] conducted experiments and simulations of strengthened ultra-high ductility concrete and ultra-high performance concrete (UHDC-UHPC) composite slabs subjected to close blast loading. Due to the ultra-high compressive strength and stiffness of the UHPC panels, there was almost no damage to the UHPC on the front side, and only multiple microcracks were observed in the UHDC on the back side under close blast loading, which indicates the excellent blast resistance of the UHDC-UHPC composite slabs.…”

Experimental study on protection of prestressed concrete box girder under vehicle explosion of bridge deck

“…In a study on the explosion resistance of upper beam and plate structures of bridges, Zhu et al 5 have studied the explosion failure mode and structural dynamic response of reinforced concrete box girders in combination with explosion tests and quantitatively evaluated the damage process of box girders subjected to vehicle explosions. Liao et al 6 studied the explosive dynamic performance of UHDC(Ultra‐high ductile concrete)–UHPC (ultra‐high‐performance concrete) panel (i.e., hybrid panel) by using numerical simulation method. It is concluded that the maximum deflection of reinforced UHDC–UHPC panels reduces with increasing scale distance and reinforcement ratio.…”

Study on steel fiber synergistically reinforced cellular concrete explosion‐proof effect in an underwater near‐field environment

“…Research on the explosion‐proof effectiveness of materials should be gradually extended from the material level to the structure level to fully reveal the dynamic response characteristics, failure modes, and other changes to the protected structure after setting a protective body under the explosion impact load and to evaluate the explosion‐proof effectiveness of protective materials. At present, many scholars have used numerical simulation to explore the impact of different types of explosion‐proof materials on the explosion‐proof performance of structures under explosive impact loads and have made some theoretical achievements that are helpful in the selection and design of explosion‐proof materials 18–20 . Liu et al 21 found that the damage degree of high‐performance geopolymer composite walls reinforced by steel wire mesh (SWM) under explosive impact loads was lower than that of conventional reinforced concrete walls and SWM‐ and aluminum foam‐reinforced high‐performance geopolymer composite walls, and the integrity of the wall structure was improved, with a superior explosion‐proof effect.…”

“…At present, many scholars have used numerical simulation to explore the impact of different types of explosion-proof materials on the explosion-proof performance of structures under explosive impact loads and have made some theoretical achievements that are helpful in the selection and design of explosion-proof materials. [18][19][20] Liu et al 21 found that the damage degree of high-performance geopolymer composite walls reinforced by steel wire mesh (SWM) under explosive impact loads was lower than that of conventional reinforced concrete walls and SWM-and aluminum foam-reinforced high-performance geopolymer composite walls, and the integrity of the wall structure was improved, with a superior explosion-proof effect. Matsagar 22 concluded that noncomposite panels composed of steel fiberreinforced concrete plates and cenospheric aluminum alloy syntactic foam composite sandwich plates offer good explosion-proof performance.…”