Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics最新文献_第2页

Assessing dynamic compression of AA2024-T351 with split Hopkinson pressure bar simulation 用拆分Hopkinson压杆模拟评估AA2024-T351的动态压缩

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-01-11 DOI: 10.1680/jencm.22.00014

M. Gupta

引用次数: 0

Investigating the hydraulic resonance behavior in pressurized in-series piping systems 串联加压管道系统液压谐振特性研究

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2022-12-05 DOI: 10.1680/jencm.21.00006

Badreddine Essaidi, A. Triki

{"title":"Investigating the hydraulic resonance behavior in pressurized in-series piping systems","authors":"Badreddine Essaidi, A. Triki","doi":"10.1680/jencm.21.00006","DOIUrl":"https://doi.org/10.1680/jencm.21.00006","url":null,"abstract":"This study outlines a methodology to inspect the resonant characteristics of in-series-pipes hydraulic systems. The numerical model is based on the impedance approach, assuming the sinusoidal fluctuations of flow-rate and pressure parameters, in conjunction with the Transfert Matrix concept, being implemented for automatic calculations within a complex piping systems framework. To verify the validity of the used numerical technique, the computed results were compared with a conventional numerical solution quoted in the literature. Applications address the free and forced vibration cases occurring into an in-series-pipes system. The free vibration case, is caused by an oscillating valve downstream with a constant level tank upstream; while the forced vibration case is caused by the closure of a turbine downstream. The obtained results show the reliability of the proposed numerical procedure to determine the natural frequencies of a complex in-series hydraulic system. However, this study unveils that the “equivalent pipe” concept is not accurate for analyzing the resonating behavior of a complex in-series pipe system.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76144451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Finite Element Modelling of RC Beams with CFRP Strengthened Web Openings 碳纤维布加固腹板开孔RC梁的有限元模拟

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2022-10-26 DOI: 10.1680/jencm.22.00010

Ahmed A. Elansary, Hadeer H. Abd El Salam, H. Abdalla

{"title":"Finite Element Modelling of RC Beams with CFRP Strengthened Web Openings","authors":"Ahmed A. Elansary, Hadeer H. Abd El Salam, H. Abdalla","doi":"10.1680/jencm.22.00010","DOIUrl":"https://doi.org/10.1680/jencm.22.00010","url":null,"abstract":"Web openings are commonly used in reinforced concrete (RC) beams to accommodate pipes, ducts, and utilities. The expected reduction in strength can be compensated by locally strengthening the beam opening with carbon-fiber-reinforced polymer (CFRP). In this paper, a robust nonlinear finite element model (FEM) is developed to simulate the behavior of RC beams with/without openings. The model can simulate the strengthening of the beam opening with CFRP sheets. The developed FEM is validated using seven simply supported RC beams that were previously tested under monotonic two concentrated loads. One specimen was considered as a control beam that did not have any openings, while the six other beams had a web opening with various dimensions and locations from support, two of them were strengthened with CFRP. The crack pattern and load-deflection relationship, from the FEM, were compared to those obtained from the experiments. The developed FEM was utilized to conduct a parametric study on 32 beams to investigate the behavior of RC beams with CFRP strengthened openings. The parametric study showed that the opening width did not significantly affect the load at failure. However, both the opening depth and distance from support had a clear effect on the failure load. Increasing the stirrups diameter from 8 mm to 10 mm increased the shear capacity of RC beams by 3∼16%. Also, it was concluded that strengthening the web opening with CFRP sheets increased the shear capacity by 1∼26% compared to similar beams without CFRP. The failure loads obtained from the proposed FEM were compared to those obtained from international design codes; the ACI 318-19 (2019), CSA A23.3-14 (2014), ACI 440.1R (2015) and CSA-S806 (2012). Differences between the FEM and predicted failure loads ranged between −30% to +50% for ACI 318-19 (2019) and −19% to +63% for CSA A23.3-14 (2014) for beams without CFRP. The differences became −18% to +54% for ACI 440.1R (2015) and +5% to +80% for CSA-S806 (2012) for beams with CFRP.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84669891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Natural Ventilation in Caribbean homes: a Numerical Investigation 加勒比地区家庭的自然通风:一项数值调查

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2022-10-12 DOI: 10.1680/jencm.21.00001

D. Villarroel-Lamb, A. R. Lamb

{"title":"Natural Ventilation in Caribbean homes: a Numerical Investigation","authors":"D. Villarroel-Lamb, A. R. Lamb","doi":"10.1680/jencm.21.00001","DOIUrl":"https://doi.org/10.1680/jencm.21.00001","url":null,"abstract":"Traditionally, residential buildings in the Caribbean relied on natural ventilation to regulate air quality and temperature. As urban areas developed, there was greater dependence on mechanical ventilation and air-conditioning. In a bid to reduce the carbon footprint, there is an impetus to promote methods of natural ventilation. This research completes Computational Fluid Dynamics (CFD) analyses, using a typical contemporary model home as a case study, to investigate the natural ventilation performance of two types of ventilation blocks, Arcadian and Innovent, available for use in residences in Trinidad and Tobago. Differences in terms of internal air velocity due to varying wind directions are compared for each type of ventilation block used which are primarily positioned in the upper portions of the walls. The Arcadian has been used since the 1960s, with the Innovent being a more recent addition to the Caribbean construction landscape. The air velocities varied across the elevation, and the wind direction was a critical factor in achieving maximum air speeds at indoor locations. The elevation-averaged internal air flow velocities were similar for both ventilation blocks investigated, and the changes in wind direction showed no significant difference in the overall ventilation performance characteristics when comparing the two blocks.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83123977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on mesoscopic numerical parameters in numerical tests of sand-pebble geology 砂砾地质数值试验中细观数值参数研究

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2022-08-23 DOI: 10.1680/jencm.22.00007

Xuansheng Cheng, Huadong Liu, Haibo Liu, Yuyue Bu, Hong-yan Su, Chaobo Chen

{"title":"Study on mesoscopic numerical parameters in numerical tests of sand-pebble geology","authors":"Xuansheng Cheng, Huadong Liu, Haibo Liu, Yuyue Bu, Hong-yan Su, Chaobo Chen","doi":"10.1680/jencm.22.00007","DOIUrl":"https://doi.org/10.1680/jencm.22.00007","url":null,"abstract":"To study the influence of the meso-mechanical parameters of sand-pebble on the macro-mechanical properties, the numerical simulation method of discrete element method and the sand-pebble numerical triaxial test are used, a test method for elliptical particles is proposed, and the sensitivity analysis of the meso-mechanical parameters of sand-pebble is performed. The results show that the effective modulus of the particles has a significant effect on the macroscopic elastic modulus of the material, and the increase in the macroscopic elastic modulus of the material has an approximately linear relationship with the increase in the effective modulus. The effect of the particle stiffness ratio on the macro-mechanical properties of the material is insignificant. The increase in the friction coefficient is roughly linearly related to the increase in the peak stress. The increase in the interparticle porosity has a negative correlation with the decrease in the peak stress, and the particle diameter ratio affects both the number of particles produced and the peak stress. This paper provides a reference for the theoretical basis for subsequent research on the physical and mechanical characteristics of sand-pebble geology.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82604455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Discrete Element Modelling of Concrete Behaviour under Uniaxial Compressive Test 单轴压缩试验下混凝土性能的离散元建模

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2022-05-27 DOI: 10.1680/jencm.21.00019

S. Marooden, H. Rahimi

{"title":"Discrete Element Modelling of Concrete Behaviour under Uniaxial Compressive Test","authors":"S. Marooden, H. Rahimi","doi":"10.1680/jencm.21.00019","DOIUrl":"https://doi.org/10.1680/jencm.21.00019","url":null,"abstract":"This paper presents a three-dimensional (3D) simulation of the concrete behavior in a uniaxial compressive test using Discrete Element Modelling (DEM). The aim of this paper is to validate the numerical model developed and to study the cracking initiation and failure process in order to better understand the fracture behavior of concrete. The particles were distributed using an algorithm that is based on sieve test analysis. The parameters were set up in order to validate the numerical model with the experimental result. It was observed that the three-dimensional model with 44339 spheres is in line with the laboratory test in term of stress-strain response and macroscopic cracks development. Once the bond between the spheres was broken, it lead to the formation of microscopic cracks which were not visible in laboratory test. DEM can help to identify which part of a concrete structural element is more prone to the evolution of microscopic and macroscopic cracks. From the observation recorded during the testing, it is clear that DEM is capable of capturing concrete behavior both quantitatively and qualitatively. It is also possible to measure the strain energy stored in the linear contact bond and parallel bond. At the yielding point in the concrete the strain energy is released in the form of kinetic energy, frictional slip energy, energy of dashpot and local damping. This can be extended further to calculate fracture energy in the future works. Hence, it can be concluded DEM can be used to study the random nature of the cracking and fracturing of concrete structures.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90528697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An overview of Large-Eddy Simulation for wind loading on slender structures 细长结构风荷载大涡模拟研究综述

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2022-04-07 DOI: 10.1680/jencm.18.00028

S. Daniels, Zheng-Tong Xie

{"title":"An overview of Large-Eddy Simulation for wind loading on slender structures","authors":"S. Daniels, Zheng-Tong Xie","doi":"10.1680/jencm.18.00028","DOIUrl":"https://doi.org/10.1680/jencm.18.00028","url":null,"abstract":"Understanding and predicting the effects of wind loading on a structure is necessary for a safe, effective, and economical engineering design. Wind tunnel techniques are expensive and often provide data that is not sufficiently detailed for the structural engineer. With increasing advances in computational capabilities, it has recently become feasible to investigate these flows using numerical techniques. Of these, one of the most effective approaches to simulate the turbulence observed in natural wind is Large-Eddy Simulation (LES). The application of LES to analyse wind loading, and aeroelastic effects on structures are only a recent venture in the field. This paper reviews the progress made over the last few decades for the analysis of wind flow around slender structures, and the more recent analysis incorporating the effects of freestream turbulence. Firstly, a review of the literature for generating freestream turbulence is carried out, and are assessed based on their flaws and strengths. A number of these are subsequently used for the analysis of surface pressures on an isolated tall model building. Subsequently, a review is made into wind tunnel analysis and LES for the aeroelastic analysis of bridge sections. The recent advances in the understanding of turbulence effects on the aeroestatic responses are summarised. The future of LES and its relationship wind tunnel analysis for wind loading analysis are discussed.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86601170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Study on Test Setups for Determining the Failure Characterization in Masonry Components 砌体构件破坏特性测定试验装置研究

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2022-01-21 DOI: 10.1680/jencm.21.00014

Didem Dönmez

{"title":"Study on Test Setups for Determining the Failure Characterization in Masonry Components","authors":"Didem Dönmez","doi":"10.1680/jencm.21.00014","DOIUrl":"https://doi.org/10.1680/jencm.21.00014","url":null,"abstract":"This paper presents experimental studies and detailed micro-modeling on test setups to determine the strength and failure mechanism of brick masonry components. Experimental studies include compressive strength tests of masonry units, Red Clay brick masonry triplet tests, and Z-shaped flexural bond tests. Failure mechanism for masonry relates not only to mortar and brick material properties, but also to the bond strength between the brick and mortar. A contact law based on Cohesive Zone Model and Coulomb's law was used to describe the fracture behavior of mortar joints. Numerical studies are based on the interface cohesive model for mixed modes I and II. Tests were evaluated numerically using the Benzeggagh-Kenane mixed mode criterion. The results obtained from the FE simulation showed the reliability of computational modeling approaches for masonry bed joint behavior. Finally, a parametric study on masonry triplet tested under various compression stresses was performed by using the FE simulation. The results indicate the increase of normal compression stress leads to an increase in shear bond strength of masonry.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78540259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A discrete rotating links model for the nonlinear torsion-shear behaviour of masonry joints 砌体节点非线性扭剪特性的离散旋转杆模型

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2021-10-18 DOI: 10.1680/jencm.21.00010

B. Pantò, C. Casapulla, I. Caliò

引用次数: 5

Behaviour of masonry walls strengthened with fibre-reinforced cementitious materials 纤维增强胶凝材料加固砌筑墙的性能

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2021-09-30 DOI: 10.1680/jencm.21.00009

T. Celano, F. Ceroni, G. Lignola

引用次数: 4