Damage Assessment of Two-Way RC Slab Subjected to Blast Load Using Mode Approximation Approach

Abstract

Significant research efforts have been invested on studying the response and damage of structures subjected to blast loads for better life and property protections. The single-degree-of-freedom (SDOF) approach has been widely adopted to simplify the structural response analysis for engineering design purpose. However, such an approach under certain circumstances oversimplifies the structural behavior and might not give reliable predictions of structural responses to blast loads. On the other hand, although detailed high fidelity finite element (FE) approach is able to give relatively accurate predictions of structural response, it is unfortunately not straightforward for application and very time-consuming, which impedes its application among engineers. Therefore, a method that can assure not only reliability but also efficiency is highly needed for design practice. In the present study, mode approximation method with Pressure–Impulse (P-I) diagrams is applied to analyze response and damage of RC slab due to blast load. Slab under analysis is assumed rigid-plastic and simply supported. Shear failure, bending failure and combined failure modes are considered based on different failure modes. Critical equations for structural shear and bending failures are derived respectively with appropriate failure criteria. P–I diagrams are then developed for quick damage assessments. The analytical results are verified by comparing with high fidelity numerical simulations. The reliability and efficiency of using this approach for design and analyzing RC slab response under blast loads are demonstrated.

Evaluation of critical damage location of contact blast on conventionally reinforced one-way square concrete slab applying CEL-FEM blast modeling technique

“…Rise in terrorism and increase in accidental detonation events highlight the need for the blast-resistant design of conventional structures (Anas et al, 2021b; Kyei and Braimah, 2017). Anumber of researchers (Alonso et al, 2011; Anas et al, 2020a, 2020b, 2021bbib_Anas_et_al_2020abib_Anas_et_al_2020bbib_Anas_et_al_2021b; Castedo et al, 2015; Huang et al, 2016; Li et al, 2011, 2015a, 2015b, 2020bib_Li_et_al_2011; Li and Hao, 2014bib_Li_et_al_2015abib_Li_et_al_2015bbib_Li_et_al_2020; Lin et al, 2014; Wang et al, 2013; Wu and Hao, 2005bib_Wu_et_al_2009abib_Wu_et_al_2009b; Xu and Lu, 2006; Yao et al, 2016; Zhang et al, 2013; Zheng et al, 2018; Zhao and Chen, 2013; Zhao et al, 2012, 2018, 2019a, 2019bbib_Zhao_et_al_2012bib_Zhao_et_al_2018bib_Zhao_et_al_2019abib_Zhao_et_al_2019b; Zhou and Hao, 2009; Zhou et al, 2008) have identified failure of reinforced cement concrete (RCC) slabs under explosion loading as a potential threat to the building infrastructure. Failure of top story columns and slab due to a confined gas explosion resulting partial collapse of a residential building in Central Russia (Anas et al, 2021b; Myers et al, 2004), the collapse of intermediate columns supporting a slab causing severe damage to the apartment building in the western Germany city of Wuppertal (Myers et al, 2004), and internal gas explosion in Maryland buildings (Columbia) leading to progressive collapse are some of the examples of accidental explosions (Figure 1) (Nash et al, 1995; Netten and Dewey, 1997; Osteraas, 2006).…”

Review on quick safety assessment of building structures in complex urban environment after extreme explosion events

“…The P-I diagrams in the dynamic and impulsive districts are also sensitive to various influencing factors. Many attempts have been implemented to tackle the variation of the P-I diagram, such as the piecewise equations regarding multiple failure modes (Huang et al, 2017; Li and Hao, 2014; Xu et al, 2014), the pressure–impulse band (PIB) covering the reinforcing details and eccentric actions (El-Dakhakhni et al, 2009), and the probabilistic diagrams using the Monte Carlo method (Parisi, 2015). Meanwhile, there were also many diagrams for steel structures (Al-Thairy, 2016; Shi et al, 2017), polyvinyl butyral (PVB)–laminated float glass window (Zhang et al, 2013), brick masonry (Elliot et al, 1992) and some new-fashioned structural forms made of advanced materials (Liao et al, 2019; Zhang et al, 2017).…”

Improved analysis method for structural members subjected to blast loads considering strain hardening and softening effects

“…Based on a number of previous field blasting test and laboratory testing results on RC structures, different failure criteria have been proposed by different researchers to quantify structural damage corresponding to different failure modes (Huang et al, 2017; Ma et al, 2007; Yu and Jones, 1991). Since the maximum ductile plastic deformation is usually developed at the mid-span of a RC beam for flexural dominated response, the ratio of central deflection to half-span length is normally utilized to define the criteria for flexural bending failure; while the averaged shear strain at supports is employed to define the direct shear damage criterion since the maximum shear plastic deformation usually appears near the supports.…”