Response of structural concrete elements to severe impulsive loads

Krauthammer, Theodor; Shanaa, H. M.; Assadi, Abbas

doi:10.1016/0045-7949(94)90135-x

Cited by 47 publications

(24 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to available experimental results, with increasing strain rate, tensile and compressive strength of concrete remarkably will be increased [47][48][49][50], its elasticity modulus somewhat will be larger [47,51], the propagation process of cracks [47,52] is changed and ultimate strain of concrete also is increased [53,54]. At high strain rates, steel material's strength often up to 50%, compressive strength of concrete to 100% and tensile strength of concrete up to 600% increase [55].…”

Section: Solving Equation Of Sdof With Considering Effect Of High Strmentioning

confidence: 99%

Preparing Pressure-Impulse Diagrams for Reinforced Concrete Columns with Constant Axial Load using Single Degree of Freedom Approach

Izadifard¹,

Mollaei²,

Omran³

2016

Int J Adv Tech

View full text Add to dashboard Cite

In this paper, moment-curvature behavior of reinforced concrete column with constant axial load is determined using finite element method and then it is introduced to a single degree of freedom (SDOF) model based on EulerBernoulli theory. Using this SDOF model, dynamic response of the RC column under the blast loading is estimated. The introduced SDOF includes secondary moments (P-δ) effects, nonlinear behavior of the material and effects of strain rate on concrete and steel materials through the time calculation of the model. Results obtained from SDOF model for transverse displacement of RC column under blast loading is compared to analysis by finite element software OPENSEES. Then, introduced SDOF method is used for drawing Pressure-Impulse (P-I) diagram of the column with considering the presence of axial compressive load. According to the results, introduced SDOF model has simple and quick computations and accuracy of predictions is acceptable.P-δ effects and overall and local damages and their impact on the P-I diagram can be evaluated. However, this method due to the high complexity, high time of calculations and the need to have enough skills and experience of using software, for extensive parametric studies isn't very appropriate.In this paper, the flexural behavior (moment-curvature) of a reinforced concrete column section using finite element software of open system for earthquake engineering simulation (OpenSees) has been determined and introduced to the calculation of SDOF analytical model in order to estimate transverse displacement response of column under simultaneous compressive axial force and lateral loading of blast. The SDOF introduced model includes the effects of secondary moments (P-δ) and also the effects of high strain rates on the behavior specifications of concrete and steel rebar. In this method, to consider the effects of the existence of column axial loading (P-δ) the concept of reduced resistance function is used. Using the introduced process, P-I dimensionless curves have been plotted for reinforced concrete column. Figure 2 shows the distribution of stress and strain in the rectangular RC section at the ultimate state. Strain distribution in the height of the section has been assumed to be linear and curvature of section (θ) is equal to the slope of this line. Also, the tensile strength of concrete has been ignored. In the figure above, f yk is the yield stress of reinforcement steel, f cu is the ultimate strength of concrete, ε cu is the ultimate strain of concrete, xu is the depth of neutral axis in the ultimate state, b is the width, h is Equivalent Single Degree of Freedom Model

show abstract

Section: Solving Equation Of Sdof With Considering Effect Of High Strmentioning

confidence: 99%

Preparing Pressure-Impulse Diagrams for Reinforced Concrete Columns with Constant Axial Load using Single Degree of Freedom Approach

Izadifard¹,

Mollaei²,

Omran³

2016

Int J Adv Tech

View full text Add to dashboard Cite

show abstract

“…With respect to impact analysis, much research about the impact loading of vehicles, missiles, and airplanes as well as the impact behavior of various materials and components has been conducted (Kim et al 2011;Krauthammer et al 1994;Zaouk et al 1996). However, There has been limited research with respect to probabilistic impact resistance capacity evaluation for a concrete structural component under impact loading.…”

Section: Analysis Details Of Rc Columns Under Impact Loadingmentioning

confidence: 99%

Collision Capacity Evaluation of RC Columns by Impact Simulation and Probabilistic Evaluation

Choi

Kim

et al. 2015

ACT

View full text Add to dashboard Cite

Recently, increasing traffic in urban areas has led to a dramatic increase in collisions between speeding vehicles and structural columns. An impact applies a greater force to a column than its regular static or dynamic load because of the mass acceleration effect of the vehicle. Vehicle impact can cause catastrophic damage to structural columns and ultimately cause them to collapse; therefore, an in-depth study of their structural resistance to vehicle impact is needed. This paper reports the behavior of a reinforced concrete (RC) compression member or column under a lateral impact load. The study quantitatively assessed the columns' resistance capacity and developed an impact-resistance capacity evaluation procedure. Because it is extremely difficult and costly to experimentally perform a parametric study for column impact scenarios, this analytical study was carried out using LS-DYNA, a commercial explicit finite element (FE) analysis program that simulates the effects of a high strain rate from impact or blast loading on structural and material behavior. The parameters used for this case study were cross-section shape variation, impact load angle, axial load magnitude ratio, concrete compressive strength, longitudinal and lateral reinforcement ratios, and slenderness ratio. Using the analysis results, an impact resistance capacity evaluation procedure using a probabilistic approach is proposed.

show abstract

“…However, experimental observations indicate that the transverse motions of a beam have a finite maximum wave speed irrespective of the wavelength (Jones, 2011). As for the TBT, it is able to account for not only rotatory inertia but also shear deformation (Timoshenko, 1921); its governing equations can be solved using the finite difference (Krauthammer et al, 1993a(Krauthammer et al, , 1993b(Krauthammer et al, , 1994 or FE (Dragos and Wu, 2014;Wu and Sheikh, 2013) formulation, but the latter is more straightforward for a subsequent whole structural analysis when it is implemented in a general FE code, such as LS-DYNA (Hallquist, 2007). Due to the high cost of blast experimental programs and some limitations from security concerns, the HFPB method has been widely adopted by researchers for the analysis of RC columns (Bao and Li, 2010;Shi et al, 2008;Williams and Williamson, 2011) and structures (Jayasooriya et al, 2011;Luccioni et al, 2004;Shi et al, 2010) against blast loads.…”

Section: Introductionmentioning

confidence: 99%

“…Currently available blast analysis methods for RC components are typically based on the single-degreeof-freedom (SDOF) system (Biggs, 1964), EulerBernoulli beam theory (EBT) (Carta and Stochino, 2013), Timoshenko beam theory (TBT) (Krauthammer et al, 1993a(Krauthammer et al, , 1993b(Krauthammer et al, , 1994, and high-fidelity physicsbased (HFPB) finite element (FE) methods (Bao and Li, 2010;Crawford et al, 2012;Crawford and Magallanes, 2011;Hao and Hao, 2014;Magnusson et al, 2010;Shi et al, 2008). Although the SDOF method has the capability to account for the combined effects of flexure, shear, and axial force using a specifically derived resistance function, its overly simplified assumption generally leads to unreliable and inaccurate results (El-Dakhakhni et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

An effective model for analysis of reinforced concrete members and structures under blast loading

Zhong

Shi

2016

Advances in Structural Engineering

View full text Add to dashboard Cite

The traditional fiber beam model has been widely used in the seismic analysis of reinforced concrete members and structures. However, the inability to capture shear failure restricts its application to blast loadings. In this article, a numerical model that considers both rate-dependent shear behavior and damage effect is proposed based on the traditional fiber beam element. This is achieved using the modified compression-field theory with a concrete damage model and bilinear steel model in the principal directions. Meanwhile, a condensed three-dimensional stress-strain relation from the isotropic hardening plasticity model is implemented to simulate longitudinal reinforcement bars, as large shear strain would be produced under severe blast loads. The proposed model is validated by comparing the numerical and test results. The high-fidelity physics-based finite element model, validated by the same experiment, is also used in the study to prove the efficiency of the proposed model. Case studies of a reinforced concrete beam and a six-story reinforced concrete frame structure subjected to blast loads are then carried out. The results indicate that the proposed model is reliable compared with the high-fidelity physics-based model. In addition to the accuracy, comparisons of the computational time show an excellent performance with respect to the efficiency of the proposed model.

show abstract

Response of structural concrete elements to severe impulsive loads

Cited by 47 publications

References 10 publications

Preparing Pressure-Impulse Diagrams for Reinforced Concrete Columns with Constant Axial Load using Single Degree of Freedom Approach

Preparing Pressure-Impulse Diagrams for Reinforced Concrete Columns with Constant Axial Load using Single Degree of Freedom Approach

Collision Capacity Evaluation of RC Columns by Impact Simulation and Probabilistic Evaluation

An effective model for analysis of reinforced concrete members and structures under blast loading

Contact Info

Product

Resources

About