Experimental and numerical study on compressive performance of perforated brick masonry after fire exposure

2018 ◽  
Vol 43 (2) ◽  
pp. 200-218 ◽  
Author(s):  
Jin Zhang ◽  
Qiang Zhang ◽  
Donghao Zhang ◽  
Qingfeng Xu ◽  
Weibin Li
Keyword(s):  
Numerical Study ◽  
Brick Masonry ◽  
Fire Exposure ◽  
Compressive Performance

Experimental and Numerical Simulation Study on Compressive Performance of Autoclaved Fly Ash Perforated Brick Masonry Long Columns

2011 ◽  
Vol 243-249 ◽  
pp. 704-709
Author(s):  
Chun Yi Xu ◽  
Ming Liu ◽  
Bo Xu
Keyword(s):  
Numerical Simulation ◽  
Fly Ash ◽  
Bearing Capacity ◽  
Simulation Study ◽  
Brick Masonry ◽  
Experimental Results ◽  
Compression Tests ◽  
Compression Performance ◽  
Code Compression ◽  
Compressive Performance

To study the influence of slenderness on the compressive bearing capacity of autoclaved fly ash perforated brick masonry long columns and provide experimental evidences for making corresponding technical code, compression tests were conducted on 9 autoclaved fly ash perforated brick masonrys long columns of different slenderness. The damage patterns and compression performance are analyzed. The experimental results indicate that compressive capacity decreases proportionally as slenderness increases and the proposed formula of axial compressive bearing capacity for autoclaved fly ash perforated brick masonry columns is given. The nonlinear FEA program ANSYS is also adopted to simulate the behaviors of masonry columns. By comparing results find that the simulated results agree well with the test ones, the rationality and applicability of the model are verified.

scholarly journals Experimental and Numerical Study of Behaviour of Reinforced Masonry Walls with NSM CFRP Strips Subjected to Combined Loads

Buildings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 103
Author(s):  
Houria Hernoune ◽  
Benchaa Benabed ◽  
Antonios Kanellopoulos ◽  
Alaa Hussein Al-Zuhairi ◽  
Abdelhamid Guettala
Keyword(s):  
Failure Modes ◽  
Numerical Study ◽  
Masonry Wall ◽  
Brick Masonry ◽  
Masonry Walls ◽  
Near Surface ◽  
Combined Loads ◽  
Reinforced Masonry ◽  
Brick And Mortar ◽  
Near Surface Mounted

Near surface mounted (NSM) carbon fibers reinforced polymer (CFRP) reinforcement is one of the techniques for reinforcing masonry structures and is considered to provide significant advantages. This paper is composed of two parts. The first part presents the experimental study of brick masonry walls reinforced with NSM CFRP strips under combined shear-compression loads. Masonry walls have been tested under vertical compression, with different bed joint orientations 90° and 45° relative to the loading direction. Different reinforcement orientations were used including vertical, horizontal, and a combination of both sides of the wall. The second part of this paper comprises a numerical analysis of unreinforced brick masonry (URM) walls using the detailed micro-modelling approach (DMM) by means of ABAQUS software. In this analysis, the non-linearity behavior of brick and mortar was simulated using the concrete damaged plasticity (CDP) constitutive laws. The results proved that the application of the NSM-CFRP strips on the masonry wall influences significantly strength, ductility, and post-peak behavior, as well as changing the failure modes. The adopted DMM model provides a good interface to predict the post peak behavior and failure mode of unreinforced brick masonry walls.

Experimental and numerical study of unreinforced clay brick masonry walls subjected to vented gas explosions

2017 ◽  
Vol 104 ◽  
pp. 107-126 ◽  
Author(s):  
Zhan Li ◽  
Li Chen ◽  
Qin Fang ◽  
Hong Hao ◽  
Yadong Zhang ◽  
...  
Keyword(s):  
Numerical Study ◽  
Brick Masonry ◽  
Masonry Walls ◽  
Clay Brick ◽  
Gas Explosions

EXPERIMENTAL AND NUMERICAL STUDY ON IN-PLANE BEHAVIOR OF BRICK MASONRY WALL PANELS

2011 ◽  
Vol 11 (03) ◽  
pp. 431-450 ◽  
Author(s):  
S. CHITRA GANAPATHI ◽  
A. RAMA CHANDRA MURTHY ◽  
NAGESH R. IYER ◽  
N. LAKSHMANAN ◽  
N. G. BHAGAVAN
Keyword(s):  
Numerical Study ◽  
Plane Deformation ◽  
Lateral Load ◽  
Brick Masonry ◽  
Brick Wall ◽  
Wall Panel ◽  
Displacement Ductility ◽  
Wall Panels ◽  
Experimental Values ◽  
Reduction Factors

This paper presents the details of studies conducted on brick masonry units and wall panels. The investigation includes, compressive strength of brick unit, prisms, flexural strength evaluation, and testing of reinforced brick wall panels with and without opening. Nonlinear finite element analysis (FEA) of brick wall panels with and without opening has been carried out by simulating the actual test conditions. Constant vertical load is applied on the top of the wall panel and lateral load is applied in an incremental manner. The in-plane deformation is recorded under each incremental lateral load. Displacement ductility factors and response-reduction factors have been evaluated based on experimental results. From the experimental study, it is observed that fully reinforced wall panel without opening performed well compared to other types of wall panels in lateral load resistance and displacement ductility. In all the wall panels, shear cracks originated at loading point and moved toward the compression toe of the wall. The force-reduction factors of a wall panel with opening are much less when compared with fully reinforced wall panel with no opening. The displacement values obtained by nonlinear FEA were found to be in good agreement with the corresponding experimental values. The difference in the computed and experimental values is attributed to the influence of mortar joint which was not considered in FEA. The derived response-reduction factors will be useful for adopting elastoplastic design procedures for lateral forces generated due to earthquakes.

scholarly journals Behavior of RC Beams Strengthened with NSM-CFRP Strips Subjected to Fire Exposure: A Numerical Study

2021 ◽  
Vol 11 (6) ◽  
pp. 7782-7787
Author(s):  
H. A. Al-Baghdadi ◽  
A. Sabah
Keyword(s):  
Numerical Study ◽  
Numerical Models ◽  
Fire Behavior ◽  
Three Dimensional ◽  
Structural Response ◽  
Rc Beams ◽  
Fire Exposure ◽  
Efficient Technology ◽  
Near Surface ◽  
Endurance Tests

The use of Near-Surface Mounted (NSM) Carbon-Fiber-Reinforced Polymer (CFRP) strips is an efficient technology for increasing flexural and shear strength or for repairing damaged Reinforced Concrete (RC) members. This strengthening method is a promising technology. However, the thin layer of concrete covering the NSM-CFRP strips is not adequate to resist heat effect when directly exposed to a fire or at a high temperature. There is clear evidence that the strength and stiffness of CFRPs severely deteriorate at high temperatures. Therefore, in terms of fire resistance, the NSM technique has a significant defect. Thus, it is very important to develop a set of efficient fire protection systems to overcome these disadvantages. This paper presents a numerical study that investigates the fire behavior of thermally insulated RC beams flexurally strengthened with NSM-CFRP strips and subjected to fire exposure according to the ISO 834 standard. The numerical study considered three-dimensional finite element models in the ABAQUS software that have been developed to simulate and predict the performance (thermal and structural response) of fire endurance tests on strengthened, uninsulated strengthened, and thermally insulated beams strengthened with NSM-CFRP strips, which were exposed to fire and had different fire insulation schemes. The insulation used was plaster from local material with a thickness range of 25 to 50mm. The variation of the thermal and mechanical properties with the temperature of the constituent materials was considered. All beams' mechanical and thermal responses were adequately simulated using numerical models. The results of the numerical simulations were in good agreement with the experimental data. The fire behavior of the NSM-CFRP strengthened RC beams was examined and particularly the efficiency of the NSM strengthening system during the fire. The behavior in the fire of the NSM-CFRP strengthening system on the RC beams thermally protected with different fire insulation schemes was assessed. Finally, the effectiveness of fire insulation was studied.

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