scholarly journals Sensitivity Analysis of Steel-Plate Concrete Containment against a Large Commercial Aircraft

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2829
Author(s):  
Xiuyun Zhu ◽  
Jianbo Li ◽  
Gao Lin ◽  
Rong Pan ◽  
Liang Li
Keyword(s):  
Sensitivity Analysis ◽  
Plastic Strain ◽  
Steel Plate ◽  
Concrete Strength ◽  
Plate Thickness ◽  
Time History ◽  
Commercial Aircraft ◽  
Strength Grade ◽  
Displacement Response ◽  
The Impact

Due to the excellent impact resistant performance of steel-plate concrete (SC) structure compared with the conventional reinforced concrete (RC) structure, SC structure is preferred to be used in the design of external walls of nuclear island buildings for new nuclear power plants (NPPs). This study aims at evaluating the effect of material and geometric parameters of SC containment on its impact resistant performance, thus the numerical simulation and sensitivity analysis of SC containment subjected to malicious large commercial aircraft attack are conducted based on the force time-history analysis method. The results show that: (1) the impact resistant performance of full SC containment is better than that of half SC containment; (2) for relatively thin full SC containment, the impact response and concrete damage can be significantly reduced by the enhancing of concrete strength grade or the increasing of steel plate thickness; (3) for the thicker full SC containment, concrete strength grade has only a slight influence on the impact displacement response, and the increasing of steel plate thickness has no significant effect on mitigating the impact displacement response. However, the increasing of steel plate thickness can effectively reduce its plastic strain, and the decreasing of strength grade of steel plate may obviously increase its plastic strain; and (4) concrete thickness plays a decisive role on the improvement of impact resistance, which is more effective than the enhancing of concrete strength grade. Resultantly, this paper provides a reference and guidance for the design of SC structure external walls of nuclear island buildings against a large commercial aircraft.

scholarly journals Behaviour of corrugated steel plate bridge with high soil cover under seismic excitation

2018 ◽  
Vol 174 ◽  
pp. 04003 ◽  
Author(s):  
Tomasz Maleska ◽  
Damian Beben
Keyword(s):  
Soil Cover ◽  
Steel Plate ◽  
Numerical Study ◽  
Shell Height ◽  
Plate Thickness ◽  
Time History ◽  
Seismic Excitation ◽  
Bridge Span ◽  
Load Carrying ◽  
Static And Dynamic Loads

The design codes and calculation methods related to the corrugated steel plate (CSP) bridges and culverts say only on the minimum soil height. This value is connected with the bridge span and shell height. In the case of static and dynamic loads (like passing the vehicles), such approach seems to be reasonable. However, it is important to know how the CSP bridges with high the soil covers behave under the seismic loads. This paper is presented the result of numerical study of CSP bridge with different high cover under seismic excitation. The analysed CSP railway bridge in the cross section has two closed pipe-arches. The span of shells is 4.40 m and the height of shells is 2.80 m. The load-carrying structure was constructed as two shells assembled from CSP sheets, designed with a depth of 0.05 m, pitch of 0.15 m, and plate thickness of 0.003 m. The real soil cover depth over the CSP structure (including ballast, blanket and backfill) equals 2.40 m. In this study two heights of soil cover were analysed (2.40 m and 5.00 m). Numerical analysis was conducted using the DIANA program based on finite element method (FEM). A linear model with El Centro records and Time History was used to analyse the problem.

Experimental Study on Flexural Behaviors of Steel Reinforced Recycled Coarse Aggregate Concrete Beams

2012 ◽  
Vol 166-169 ◽  
pp. 1614-1619 ◽  
Author(s):  
Wen Yue Qin ◽  
Yu Liang Chen ◽  
Zong Ping Chen
Keyword(s):  
Bearing Capacity ◽  
Coarse Aggregate ◽  
Concrete Beams ◽  
Concrete Strength ◽  
Recycled Concrete ◽  
Flexural Behavior ◽  
Aggregate Concrete ◽  
Strength Grade ◽  
Recycled Coarse Aggregate ◽  
The Impact

In order to reveal the flexural behavior of normal section of steel reinforced recycled coarse aggregate concrete beams，6 steel reinforced recycled concrete beams were designed for flexural test，the study mainly considered the impact of coarse aggregate replacement rates and concrete strength grade two changing parameters on the flexural behavior of steel reinforced recycled coarse aggregate concrete beams. Through this test, the whole mechanical process、crack distribution and failure behavior of this kind of specimens were observed, and obtained the stress-strain distribution curves、the ultimate bearing capacity and load-displacement curves parameters. Based on the study measurement data, deeply analyzed the impact of coarse aggregate replacement rates and concrete strength grade on the flexural behavior of steel reinforced recycled coarse aggregate concrete beams. The result shows that: steel reinforced recycled coarse aggregate concrete beams’ failure pattern was similar to normal SRC beams, during loading process the section strain agreed with the plane-section assumption, and the beams have good bearing capacity and deformation performance.

scholarly journals Influence of Different Sites on Impact Response of Steel-Plate Concrete Containment against a Large Commercial Aircraft

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4957
Author(s):  
Xiuyun Zhu ◽  
Jianbo Li ◽  
Gao Lin ◽  
Rong Pan ◽  
Liang Li
Keyword(s):  
Boundary Condition ◽  
Shear Wave Velocity ◽  
Impact Analysis ◽  
Steel Plate ◽  
Impact Response ◽  
Site Conditions ◽  
Commercial Aircraft ◽  
Fixed Boundary ◽  
Damping Effect ◽  
The Impact

This paper aimed at evaluating the influence of different site conditions on the impact response of the structure of nuclear power plants (NPPs) against a large commercial aircraft. The lumped parameter site dynamic model recommended by the code of ASCE 4-98 was used to consider the different homogeneous sites. With respect to the excellent impact resistant performance of steel-plate concrete (SC) structure, the full SC containment is selected as the research object. The impact analysis of the full SC containment against a large commercial aircraft under different site conditions was carried out, based on the force time-history analysis method. The numerical results in terms of the displacement, plastic strain, local concrete damage, and different values of energy were evaluated. The results showed that: (1) For the relatively thin full SC containment, the impact response under the fixed boundary is the largest, while that calculated by other, different sites varies greatly, and there is no consistent rule, the boundary condition which is assumed to be fixed is relatively conservative. (2) For the thicker full SC containment, the displacement response decreased with the increasing of the site shear wave velocity, which is the smallest when the fixed boundary is considered. When the shear wave velocity of the site is large enough, its boundary condition which is assumed to be the fixed constraint is reasonable. (3) For the relatively thin full SC containment, the site damping effect has a significant effect on the structural impact response. Nevertheless, the impact response of the thicker containment is slightly influenced by the site damping effect. (4) For the impact analysis of the structures of NPPs against a large commercial aircraft, it is suggested that both the specific site condition and fixed boundary should be considered.

scholarly journals Development of Time-Reversal Method for Impact Source Identification on Plate Structures

2013 ◽  
Vol 20 (3) ◽  
pp. 561-573 ◽  
Author(s):  
Chunlin Chen ◽  
Yulong Li ◽  
Fuh-Gwo Yuan
Keyword(s):  
Impact Loading ◽  
Time Reversal ◽  
Source Identification ◽  
Transfer Functions ◽  
Plate Thickness ◽  
Time History ◽  
Numerical Verification ◽  
Impact Location ◽  
Location Detection ◽  
The Impact

This paper presents a detailed study on the impact source identification of a plate structure using time-reversal (T-R) method. Prior to impact monitoring, the plate is calibrated (or characterized) by transfer functions at discrete locations on the plate surface. Both impact location and impact loading time-history are identified using T-R technique and associated signal processing algorithms. Numerical verification for finite-size isotropic plates under low velocity impacts is performed to demonstrate the versatility of T-R method for impact source identification. The tradeoff between accuracy of the impact location detection and calibration spacing is studied in detail. In particular, the effect of plate thickness on calibration spacing has been examined. A number of parameters selected for determining the impact location, approximated transfer functions and steps taken for reconstructing the impact loading time-history are also examined. Two types of noise with various intensities contaminated in strain response and/or transfer functions are investigated for demonstrating the stability and reliability of the T-R method. The results show that T-R method is robust against noise in impact location detection and force reconstruction in circumventing the inherent ill-conditioned inverse problem. Only transfer functions are needed to be calibrated and four sensors are requested in T-R method for impact identification.

Optimisation of Ceramic/Steel Composite Armour of a Constant Thickness

Volume 1 ◽  
2004 ◽  
Author(s):  
Tanju Cakir ◽  
R. Orhan Yildirim ◽  
Bilgehan Ogel
Keyword(s):  
Ceramic Tile ◽  
Steel Plate ◽  
Plate Thickness ◽  
Impact Resistance ◽  
Thickness Ratio ◽  
Constant Thickness ◽  
Impact Behaviour ◽  
Back Plate ◽  
Steel Composite ◽  
The Impact

Impact resistance of ceramic/steel composite armour against 7.62 mm AP (armour piercing) projectile is examined analytically, numerically and experimentally. Total armour thickness is taken to be constant. Ceramic tile thickness and steel plate thickness are changed to observe the effect of the variation of the thickness ratio on the impact behaviour of ceramic/steel armour. Results show that the impact behaviour of ceramics is related to the ceramic tile thickness and back plate thickness. It is found that there is an optimum ceramic/steel thickness ratio which provides the best protection against a specified threat for a constant total armour thickness.

Influence of Superplasticizer on Anti-Carbonation Property of Concrete

2012 ◽  
Vol 204-208 ◽  
pp. 3790-3794 ◽  
Author(s):  
Chong Sheng Zeng ◽  
Ming Zi Gong ◽  
Miao Miao Gui ◽  
Xin Qi Guo ◽  
Jun Xiu Liu ◽  
...  
Keyword(s):  
Concrete Strength ◽  
Mineral Admixtures ◽  
Strength Concrete ◽  
Strength Grade ◽  
Concrete Carbonation ◽  
Polycarboxylate Superplasticizer ◽  
Binder Ratio ◽  
Low Strength ◽  
The Impact ◽  
Water Binder Ratio

It investigated the influence of superplasticizer on anti-carbonation property of different strength grade concrete with seven kinds of polycarboxylate superplasticizer. The results indicated that concrete carbonation property would be more impacted by superplasticizer for low-strength concrete. With the growth of the concrete strength, the impact gradually decreased. The anti-carbonation property of concrete could be improved by using an appropriate amount of compound mineral admixtures or lowing water-binder ratio.

scholarly journals Simulation Analysis of Void Defect Detection in Sandwich-Structured Immersed Tunnel Using Elastic Wave

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Ruiqiang Liu ◽  
Songhui Li ◽  
Guoxin Zhang ◽  
Shenyou Song ◽  
Jianda Xin
Keyword(s):  
Influencing Factors ◽  
Steel Plate ◽  
Plate Thickness ◽  
Image Method ◽  
Detection Accuracy ◽  
Imaging Method ◽  
Waveform Data ◽  
Immersed Tunnel ◽  
Void Defects ◽  
The Impact

Void defects can be easily generated between a steel plate and concrete joint due to the complicated internal structure of a sandwich-structured immersed tunnel (SSIT), which affect the overall bearing capacity of the main structure of the immersed tube tunnel. A prototype experiment was conducted to study the application of impact imaging method in the nondestructive detection of void defects in SSITs. The detection criterion for the impact imaging method was established based on the features of the waveform data. Nevertheless, the influence of steel plate thickness, material properties, void location, and structure on the detection accuracy of the impact imaging method is unclear. Therefore, numerical simulation was applied to study the influencing factors by establishing a different condition model. Good agreement between the experimental and numerical results was observed for the response waveform collected from the inspection area. Using the calculation model and identified material parameters validated in the active prototype experiment, numerical simulations of several sets, which considered all influencing factors, were performed. The application scope and sensitivity of the impact image method were recommended to reduce misjudgement in practical applications and improve detection accuracy.

Sensitivity Analysis of FAARFIELD Rigid Airport Pavement Thickness Determination

2021 ◽  
Author(s):  
Greg White ◽  
Mitch Sterling ◽  
Matt Duggan ◽  
Jordan Sterling
Keyword(s):  
Sensitivity Analysis ◽  
Concrete Strength ◽  
Base Material ◽  
Commercial Aircraft ◽  
Primary Input ◽  
Average Percentage ◽  
Airport Pavement ◽  
Aircraft Type ◽  
Pavement Thickness ◽  
Parameter Values

FAARFIELD is a common mechanistic-empirical software that uses a combination of layered elastic and finite element methods for the determination of rigid aircraft pavement thickness. The primary input parameters are the aircraft type, mass and departures, concrete flexural strength, sub-base material and thickness, as well as subgrade support characteristic. A parametric sensitivity analysis, including three common commercial aircraft and four subgrade conditions, determined that concrete thickness was most sensitive to concrete strength and aircraft mass. The concrete thickness was least sensitive to the sub-base material and thickness and was moderately sensitive to the subgrade condition and aircraft departures. These relative sensitivities were consistent when the results were analysed based on average percentage change in concrete thickness, the average slope of lines of best fit for normalised parameter values and the coefficients of a numeric linear regression for concrete thickness. It is recommended that designers focus their attention on accurately estimating realistic concrete strength and aircraft mass values, as these parameters had the greatest influence on concrete thickness.

Fire and Explosion Analysis of Steel-Plate Composite Concrete Shield Building Under Large Commercial Aircraft Impact

2017 ◽  
Author(s):  
Shuaixi Li ◽  
Shujian Cheng ◽  
Honghui Ge ◽  
Fang Yuan ◽  
Xiaolin Huang ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Steel Plate ◽  
Pool Fire ◽  
Building Structure ◽  
Commercial Aircraft ◽  
Fea Model ◽  
Fire And Explosion ◽  
Temperature And Pressure ◽  
The Impact

The fire and explosion assessment is necessary for NPP to evaluate the effect caused by malicious large commercial aircraft impact. This report focuses on the fire and explosion effect on shield building structure of nuclear island according to the impact screening. With the investigation and analysis for the fire and explosion of aircraft impact, a simple and effective method was established. With this method the pool fire and fire explosion are analyzed and their effects on shield building structure are assessed based on the temperature and pressure distribution obtained from the FEA model.

FEM Analysis of Impact Tests for Steel Plate Concrete Panels against Scaled-Aircraft Impact

2013 ◽  
Vol 477-478 ◽  
pp. 777-783
Author(s):  
Xiu Yun Zhu ◽  
Rong Pan ◽  
Feng Sun
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Steel Plate ◽  
Experimental Result ◽  
Commercial Aircraft ◽  
Concrete Wall ◽  
Concrete Panels ◽  
Aircraft Model ◽  
The Impact ◽  
Aircraft Crash

Due to the rear-face steel plate of the steel plate concrete wall (SC) is very effective in preventing the perforation and scabbing of concrete, in order to resist the impact of commercial aircraft crash, steel plate concrete structures are usually used in the design of external walls of nuclear power plants. In this paper, the simulation analysis of the impact test of 1/7.5 scaled aircraft model impacting the steel plated concrete panels is carried out by using finite element code ANSYS/LS-DYNA. The Winfrith material model (*MAT_84) in ANSYS/LS-DYNA is used to simulate the concrete. The damage profile of panels and residual velocity of aircraft engine comparisons between the simulations and tests are presented in this paper. The results indicate that the damage modes from the impact simulations are very good agreement with the experimental result. It is verified that not only the selection of the material parameters needed for the steel plated concrete wall and aircraft model but also the entire analysis method was appropriate and effective. This paper provided the effective methodology for simulation of the response of the steel plated concrete structure of nuclear power plant due to commercial aircraft crash impact.

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