Investigation of the influence of design and material parameters in the progressive collapse analysis of RC structures

Abstract

This contribution deals with the modelling of reinforced concrete (RC) structures in the context of progressive collapse simulations. One-dimensional nonlinear constitutive laws are used to model the material response of concrete and steel. These constitutive equations are introduced in a layered beam approach, in order to derive physically motivated relationships between generalised stresses and strains at the sectional level. This formulation is used in dynamic progressive collapse simulations to study the structural response of a multi-storey planar frame subjected to a sudden column loss (in the impulsive loading range). Thanks to the versatility of the proposed methodology, various analyses are conducted for varying structural design options and material parameters, as well as progressive collapse modelling options. In particular, the effect of the reinforcement ratio on the structural behaviour is investigated. Regarding the material modelling aspects, the influence of distinct behavioural parameters can be evaluated, such as the ultimate strain in steel and concrete or the potential material strain rate effects on the structural response. Finally, the influence of the column removal time in the sudden column loss approach can also be assessed. Significant differences are observed in terms of progressive failure pattterns for the considered parametric variations.

Analysis on Dynamic Response of Reinforced Concrete Frame for Resisting Progressive Collapse

“…The shear stiffness and torsional stiffness of beam and column sections are displayed in Table 2, in which A sy and A sz are the shear area along y-axis and z-axis direction, T is the torsion constant, E c and G c are the elastic and shear modulus of concrete, k sy and k sz which are evaluated according to Eqs. (8) and (9) are the shear stiffness along y-axis and z-axis direction, and k t derived from Eq. (10) is the torsional stiffness.…”

“…Kokot et al [7] investigated a real-scale reinforced concrete flat-slab frame building and made numerical study considering three loading scenarios. Iribarren et al [8] used a more sophisticated approach consisted of a detailed modeling of reinforced concrete cross-sections to analyze a five-story RC planar frame model. Yi et al [9] conducted a static experiment of a four-bay, three-story and one-third scale RC planar frame, simulating the load transmission process.…”

Progressive Collapse Fragility Models of Rc Framed Buildings Based on Pushdown Analysis

“…Several definitions of progressive collapse, the most known of which is based on the significant disproportion in size between the initial and final damage configurations, have appeared in the literature [6][7][8][9][10][11][12]. Acting on building exposure, the contribution of nonstructural protective measures such as barriers, sacrificial elements and limitation or control of public access have been reaffirmed to be crucial in order to increase structural safety and to mitigate progressive collapse-related risk in a cost-effective manner.…”

“…Besides direct and indirect design provisions prescribed in codes and standards [13][14][15][16], a huge amount of analytical studies on blast and progressive collapse phenomena have been done [11,12,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], thus quantifying the influence of modeling assumptions and analysis techniques. Solid or shell FE [25,28,33,34], lumped-plasticity [18, 22-24, 26, 27] and spread-plasticity [11,12,17,19,25,[29][30][31][32]35] approaches have been examined for progressive collapse analysis of different building typologies ranging from civilian to strategic and military facilities. In this respect, conventional or alternative pushdown procedures and implicit or explicit nonlinear dynamic analyses have been explored using general purpose codes or open platforms.…”

Modelling of Stirrup Confinement Effects in RC Layered Beam Finite Elements Using a 3D Yield Criterion and Transversal Equilibrium Constraints

“…The present work is based on a novel combination of numerical ingredients not yet applied to the study of stirrups effects. A displacement-based 2D layered beam formulation (Santafé Iribarren et al 2011;Zendaoui et al 2016) is used with Bernoulli kinematics in a corotational framework. It involves a triaxial stress state for concrete, solving two simultaneous transversal equilibrium constraints in the beam cross section.…”