scholarly journals Fragility Curves for RC Structure under Blast Load Considering the Influence of Seismic Demand

2020 ◽  
Vol 10 (2) ◽  
pp. 445
Author(s):  
Flavio Stochino ◽  
Alessandro Attoli ◽  
Giovanna Concu
Keyword(s):  
Reinforced Concrete ◽  
Simulation Analysis ◽  
Fragility Curves ◽  
Probabilistic Approach ◽  
Blast Load ◽  
Seismic Demand ◽  
Technical Standards ◽  
Rc Structure ◽  
Probabilistic Study ◽  
Explosion Load

The complex characteristics of explosion load as well as its increasingly high frequency in the civil environment highlight the need to develop models representing the behavior of structures under blast load. This work presents a probabilistic study of the performance of framed reinforced concrete buildings designed according to the current Italian NTC18 and European EC8 technical standards. First, a simplified single degree of freedom model representing the structural system under blast load has been developed. Then, a probabilistic approach based on Monte Carlo simulation analysis highlighted the influence of seismic demand on the behavior of Reinforced Concrete RC buildings subjected to blast load.

scholarly journals Fragility Curves and Probabilistic Seismic Demand Models on the Seismic Assessment of RC Frames Subjected to Structural Pounding

2021 ◽  
Vol 11 (17) ◽  
pp. 8253
Author(s):  
Maria G. Flenga ◽  
Maria J. Favvata
Keyword(s):  
Fragility Curves ◽  
Seismic Demand ◽  
Rc Structures ◽  
Structural Pounding ◽  
Rc Frames ◽  
Rc Structure ◽  
Demand Models ◽  
Probabilistic Seismic Demand ◽  
Displacement Based ◽  
The Impact

This study aims to evaluate five different methodologies reported in the literature for developing fragility curves to assess the seismic performance of RC structures subjected to structural pounding. In this context, displacement-based and curvature-based fragility curves are developed. The use of probabilistic seismic demand models (PSDMs) on the fragility assessment of the pounding risk is further estimated. Linear and bilinear PSDMs are developed, while the validity of the assumptions commonly used to produce a PSDM is examined. Finally, the influence of the PSDMs’ assumptions on the derivation of fragilities for the structural pounding effect is identified. The examined pounding cases involve the interaction between adjacent RC structures that have equal story heights (floor-to-floor interaction). Results indicate that the fragility assessment of the RC structure that suffers the pounding effect is not affected by the examined methodologies when the performance level that controls the seismic behavior is exceeded at low levels of IM. Thus, the more vulnerable the structure is due to the pounding effect, the more likely that disparities among the fragility curves of the examined methods are eliminated. The use of a linear PSDM fails to properly describe the local inelastic demands of the structural RC member that suffers the impact effect. The PSDM’s assumptions are not always satisfied for the examined engineering demand parameters of this study, and thus may induce errors when fragility curves are developed. Nevertheless, errors induced due to the power law model and the homoscedasticity assumptions of the PSDM can be reduced by using the bilinear regression model.

Computational predictions for estimating the maximum deflection of reinforced concrete panels subjected to the blast load

2020 ◽  
Vol 139 ◽  
pp. 103527 ◽  
Author(s):  
Aydin Shishegaran ◽  
Mohammad Reza Khalili ◽  
Behnam Karami ◽  
Timon Rabczuk ◽  
Arshia Shishegaran
Keyword(s):  
Reinforced Concrete ◽  
Blast Load ◽  
Maximum Deflection ◽  
Concrete Panels ◽  
Computational Predictions

Simulation Analysis for Reinforced Concrete Aqueduct of Lijia Pumping Station

2014 ◽  
Vol 488-489 ◽  
pp. 605-608
Author(s):  
Xiang Zan Xie
Keyword(s):  
Reinforced Concrete ◽  
Simulation Analysis ◽  
Water Pressure ◽  
Water Diversion ◽  
Distribution Law ◽  
Masonry Arch ◽  
Pumping Station ◽  
Earthquake Effect ◽  
Concrete Masonry ◽  
Cushion Layer

Reinforced concrete masonry arch aqueduct is a common water diversion engineering structure. Aqueduct is decorated on the concrete cushion layer, cushion layer effects on masonry arch, the structures stress is uniform, carrying capacity is strong. This paper adopts finite element method to carry out force analysis for reinforced concrete masonry arch aqueduct of Lijia pumping station, considering aqueduct weight, water pressure and earthquake effect, etc. Researching stress and deformation distribution law of reinforced concrete masonry arch aqueduct.

Experimental of Inverted-T Shape Reinforced Concrete Wall Subjected to Blast Load

2021 ◽  
Vol 879 ◽  
pp. 254-262
Author(s):  
Mazlan Abu Seman ◽  
Sharifah Maszura Syed Mohsin ◽  
Ahmad Mujahid Ahmad Zaidi ◽  
Md Fuad Shah Koslan ◽  
Zainorizuan Mohd Jaini
Keyword(s):  
Reinforced Concrete ◽  
Blast Resistance ◽  
Retaining Wall ◽  
Construction Material ◽  
High Strength ◽  
Steel Reinforcement ◽  
Blast Load ◽  
Structural Element ◽  
Concrete Wall ◽  
Flexural Reinforcement

Reinforced concrete (RC) widely used as the construction material for the main structural element for many significant structures such as bridge and building because of its relatively high strength and economical. However, there still lacks research published regarding the appropriate reinforcement steel arrangement in a complete RC structure subjected to blast load. Most of the published experimental works focused on the small rectangular or square RC panel. From the record search, the approved design by professional engineers, when RC wall subjected to the possibility of blast load, both RC wall details either retaining wall or shear wall implemented. Therefore, the full-scale blast experiment is vital to appraise the appropriate steel reinforcement arrangement in the RC wall. The blast experiment indicated, with different steel reinforcement arrangement in the RC wall, the better blast resistance with the number of cracks on the RC wall is significantly less from one another for the wall with the arrangement of horizontal flexural reinforcement tied-outside the vertical flexural reinforcement and the hooked-in direction of vertical flexural steel reinforcement into the wall base.

scholarly journals Structural Response and Reliability Analysis of RC Beam Subjected to Explosive Loading

2011 ◽  
Vol 82 ◽  
pp. 434-439 ◽  
Author(s):  
Maurizio Acito ◽  
Flavio Stochino ◽  
Sergio Tattoni
Keyword(s):  
Reinforced Concrete ◽  
Reliability Analysis ◽  
Nonlinear Dynamic Analysis ◽  
Structural Response ◽  
Blast Load ◽  
Rc Beam ◽  
Maximum Displacement ◽  
Sdof System ◽  
Flexural Member ◽  
Random Nature

The random nature of the explosion load, associated with the random nature of material properties, and geometric dimensional characteristics, implies the need to consider them into the reliability analysis in order to have a more correct estimation of the structural behavior. Therefore, when the randomness of these parameters in the analysis is considered, the response of the structure assumes probabilistic nature, and this makes it necessary to look into the reliability measure. This paper presents results from a parametric investigation of the reliability of reinforced concrete (RC) beam subjected to blast load. The probabilistic responses of the maximum displacement for a reinforced concrete flexural member under blast loadings are evaluated by means of nonlinear dynamic analysis with simplified equivalent single-degree-of-freedom (SDOF) system. Results of numerical simulations have shown the response of structures, in terms of maximum displacement in relation also to the blast load and the geometrical and mechanical characteristics of the beams. Monte Carlo simulation of dynamic response of the equivalent SDOF system is performed to estimate the reliability.

Masonry Walls Strengthened with Fiber Reinforced Concrete Subjected to Blast Load

2020 ◽  
pp. 883-894
Author(s):  
Salah Altoubat ◽  
Abdul Saboor Karzad ◽  
Moussa Leblouba ◽  
Mohamed Maalej ◽  
Pierre Estephane
Keyword(s):  
Reinforced Concrete ◽  
Fiber Reinforced Concrete ◽  
Blast Load ◽  
Masonry Walls ◽  
Fiber Reinforced

scholarly journals Impact of Slab Thickness on Reinforced Concrete Buildings using Fragility Curves

2020 ◽  
Vol 8 (5) ◽  
pp. 4533-4538
Keyword(s):  
Reinforced Concrete ◽  
Fragility Curves ◽  
Structural Response ◽  
Software Tool ◽  
Slab Thickness ◽  
Ground Shaking ◽  
Code Of Practice ◽  
Short Period ◽  
Rc Frame Structures ◽  
The Impact

Earthquakes are the natural disaster occurring since years but during the last two decades they are causing huge looses whether it may economic or to life. This paper focuses to evaluate the seismic performance of various building confirming to Indian standard criteria for earthquake resistant design of structures and ductile detailing of reinforced concrete structures subjected to seismic Forces-code of practice, Bureau of Indian Standards, both as per the revised codes in the year 2016. Due to ground shaking, seismic loads are the governing load and thus it becomes necessary to assess the conditional probability of structural response. Use of HAZUS methodology is followed to construct seismic fragility curves as it is well-organized and defined approach. Spectral displacement plays the functional parameter to derive the expected damage for fragility. This work represented here is compiled by means of procedure for establishing the fragility curves for three typical Reinforced Concrete (RC) frame structures having variations resembling 3 storey intended for short-period structures, 6 storey used for medium-period structures and 12 storey representing long-period structures using SAP2000 as a software tool for analyzing the structure. Furthermore an attempt is made for focus on the variation of one of the major structural configuration i.e. slab thickness which is not certainly paid attention as compared to columns and beams. Slabs adds additional stiffness to the structure which can enlighten how it behaviour would be when subjected to ground excitation. As a result, the fragility curves are plotted to study the impact due to slab thickness in order they are carefully selected while design.

scholarly journals Effects of Tension Reinforcement Ratio on Ductility of Mid-Rise Reinforced Concrete Structures

2018 ◽  
Vol 1 (1) ◽  
pp. 702-708
Author(s):  
Onur Onat ◽  
Burak Yön
Keyword(s):  
Reinforced Concrete ◽  
Failure Mode ◽  
Concrete Structures ◽  
Reinforcement Ratio ◽  
Reinforced Concrete Structures ◽  
Rc Structures ◽  
Beam Elements ◽  
First Case ◽  
Rc Structure ◽  
Determine Effect

Failure mode of reinforced concrete (RC) structures are classified according to tension reinforcement ratio of beam elements. To determine effect of tension reinforcement ratio on performance of RC structure, two planar RC structure were selected. One of them is 5 stories other of them is 7 stories. Two different concrete class, C20 and C25, were considered for analysis. Three tension reinforcement combinations were considered, three different tension reinforcement ratios were used. First case is the ratio of the tension reinforcement is lower than that of the compression reinforcement, second case is the ratio of the tension reinforcement is equal to the ratio of the compression reinforcement and third case is the ratio of the tensile reinforcement is higher than the compression reinforcement.

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