Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics最新文献

Power production from wave-induced oscillations of a submerged plate 水下板块由波浪引起的振荡所产生的能量

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-11-10 DOI: 10.1680/jencm.23.00009

Yongbo Chen, Masoud Hayatdavoodi, Binbin Zhao, R. Cengiz Ertekin

{"title":"Power production from wave-induced oscillations of a submerged plate","authors":"Yongbo Chen, Masoud Hayatdavoodi, Binbin Zhao, R. Cengiz Ertekin","doi":"10.1680/jencm.23.00009","DOIUrl":"https://doi.org/10.1680/jencm.23.00009","url":null,"abstract":"This paper investigates power production from a submerged wave energy device in shallow water. The energy device consists of a fully submerged, horizontal plate, which is restricted to vertical motions only. The plate undergoes vertical oscillations due to the wave-induced loads. Oscillations of the submerged plate are converted into electricity by use of a direct-drive power take-off (PTO) system. The plate oscillations are controlled by use of a spring and the damping effect of the PTO. Interaction of non-linear shallow-water waves with the submerged plate is studied by coupling the Green–Naghdi equations for the fluid motion with the equation of the vertical motion of the horizontal plate. Particular attention is given to the power production from the oscillations of the plate through the direct-drive PTO system, and its impact on the overall performance of the device under various wave conditions. Optimised configuration of the PTO for a given wave–plate condition is achieved by performing a parametric study over a range of involved variables. It is found that the proposed wave energy device with a direct-drive PTO has very good energy production efficiency and that it is a suitable concept for power production from the ocean waves.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135088200","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 multi-objective design tool for decarbonising buildings at the concept stage 一个多目标的设计工具，在概念阶段脱碳的建筑

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-09-04 DOI: 10.1680/jencm.23.00005

Daniel Chauhan, Shane Orme, Serena Gugliotta, Zachariah Wynne, Alex Black-Roberts, Diego Padilla Philipps

{"title":"A multi-objective design tool for decarbonising buildings at the concept stage","authors":"Daniel Chauhan, Shane Orme, Serena Gugliotta, Zachariah Wynne, Alex Black-Roberts, Diego Padilla Philipps","doi":"10.1680/jencm.23.00005","DOIUrl":"https://doi.org/10.1680/jencm.23.00005","url":null,"abstract":"To enable the move to carbon-neutral building structures with net-zero operation requires a step change in how buildings are designed. Modern buildings are designed by multidisciplinary design teams each of which has competing performance objectives. Daisy is a flexible performance-based parametric design tool which harnesses computational design workflows to enable designer-led multi-objective optimisation, allowing for the design of buildings which simultaneously achieve high performance across multiple performance objectives. A case study of designs for a 63-storey commercial building is presented that demonstrates how early design space analysis facilitates better-performing buildings across architectural and engineering performance metrics and the potential of multi-objective optimisation for enabling the move towards carbon-neutral building structures. Beyond building structures, the design methodology established for Daisy can be applied to a broad range of civil engineering optimisation problems using a flexible and accessible design space formulation that can be adapted for project-specific design requirements. Designs generated using the Daisy methodology demonstrated that by increasing the spatial daylight autonomy of the benchmark building by 14.7%, the building can be moved from the 10% of designs with the highest energy use intensity to lower than 97% of other simulated designs. However, this design change significantly increases the building embodied carbon, with the new design having a building embodied carbon which is higher than 90% of other buildings simulated. Alternatively, by reducing the spatial daylight autonomy by 32.8%, the design can have an energy use intensity which is lower than 75% of other simulated designs, with a 4.4% reduction in energy use intensity, and a building embodied carbon which is lower than 60% of other simulated designs, enabling a 1.3% reduction in building embodied carbon.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84599671","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

Multiphysics analysis of tramway geotechnical infrastructure: numerical modeling 电车轨道岩土基础设施的多物理场分析:数值模拟

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-07-24 DOI: 10.1680/jencm.22.00044

Nadia Yalaoui, H. Trouzine, M. Meghachou, B. Abbès, S. Mamoune

{"title":"Multiphysics analysis of tramway geotechnical infrastructure: numerical modeling","authors":"Nadia Yalaoui, H. Trouzine, M. Meghachou, B. Abbès, S. Mamoune","doi":"10.1680/jencm.22.00044","DOIUrl":"https://doi.org/10.1680/jencm.22.00044","url":null,"abstract":"Under realistic field conditions, geotechnical infrastructures are usually influenced by complex interactions of mechanical behavior under the action of an internal water flow. This mechanism could be the main origin of damage to embankments. This study develops a new hydromechanical approach based on Darcy's law model and Biot's poroelastic concept to investigate the behavior of soil with and without Geotextile under realistic conditions. The problem's numerical solution is carried out using a finite element method. The proposed 2D model was implemented in COMSOL Multiphysics Software. Under coupled hydro-mechanical behavior, the stress in porous materials causes a volumetric change in strain, which causes fluid diffusion. Consequently, pore pressure dissipates through the pores. To discuss the advantages of coupled hydro-mechanical modeling and evaluate the Geotextile performance, volumetric strain, pore water pressure, storage, and displacement are compared for a mechanical, hydraulic, and hydromechanical model. These analyses were undertaken in connection with a tramway embankment project in a marshy area in Sidi Bel Abbes. The simulation results show better results for Geotextile and embankment in hydro-mechanical coupled modeling.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84291435","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

Vibration control of adjacent buildings based on tuned viscous mass dampers under seismic excitation 地震激励下基于调谐粘性质量阻尼器的相邻建筑振动控制

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-07-20 DOI: 10.1680/jencm.22.00047

Xiaofang Kang, Shuai Li, Jun Hu, Guanghui Xia, Yi Cai, Jun Zheng, Jiaxin Luo, Guoliang Liu, Shancheng Lei, Xinqi Wang, Qiwen Huang, Mengjun Han

引用次数: 0

In-plane dynamics of circular cell hexagonally packaged honeycombs with linear elastic and plastic base material with linear strain hardening in two principal axes 线弹性基材和双主轴线性应变硬化塑性基材圆孔六角形蜂窝的面内动力学

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-07-06 DOI: 10.1680/jencm.21.00018

D. Sun, Yu-jin Sun, Yali Xu, Haotian Luo, Lu Chang, Qian Du, Guozhi Li

{"title":"In-plane dynamics of circular cell hexagonally packaged honeycombs with linear elastic and plastic base material with linear strain hardening in two principal axes","authors":"D. Sun, Yu-jin Sun, Yali Xu, Haotian Luo, Lu Chang, Qian Du, Guozhi Li","doi":"10.1680/jencm.21.00018","DOIUrl":"https://doi.org/10.1680/jencm.21.00018","url":null,"abstract":"The in-plane deformation modes, stress–strain curves and energy absorption characteristics of circular cell hexagonally packaged honeycombs with the linear elastic and plastic base material with linear strain hardening are numerically investigated under crushing velocities 1–250 m/s in two principal axes. Three deformation modes are observed, quasi-static homogeneous mode, transition mode, and dynamic mode. The empirical formulas of critical velocities of deformation mode transition are given. With increasing crushing velocities, the fluctuation of stress becomes more violent in the plateau stress phase of stress–strain curve, which can be seen at low crushing velocities in x2 direction, but doesn't appear in x1 direction at low and even moderate crushing velocities. The densification strain is linear with the t/R ratio for a given crushing velocity, and becomes larger with the increasing velocities approximately in linear relationship under a deformation mode for a given t/R ratio. The law of mean plateau stress is consistent with the one-dimensional shock wave model and the static plateau stress is proportional to the square of relative density. Based on finite element results, three types of empirical expressions of mean plateau stress are given. Crushing force efficiency is approximately independent of t/R ratio and sensitive to the crushing velocity. The crushing force efficiency is nearly constant under quasi-static homogeneous mode, becomes smaller with increasing velocities under transition mode, and then drops and fluctuates up and down around a level under dynamic mode, which corresponds to the shapes of stress–strain curves.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82064513","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 new fast method for solving finite element equations iteratively based on Gauss-Seidel 基于Gauss-Seidel的有限元方程迭代快速求解新方法

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-06-14 DOI: 10.1680/jencm.22.00017

B. A. Haleem, I. E. El Aghoury, B. Tork, H. El-Arabaty

{"title":"A new fast method for solving finite element equations iteratively based on Gauss-Seidel","authors":"B. A. Haleem, I. E. El Aghoury, B. Tork, H. El-Arabaty","doi":"10.1680/jencm.22.00017","DOIUrl":"https://doi.org/10.1680/jencm.22.00017","url":null,"abstract":"Solving large equations systems is the most consuming part of finite element modeling – iterative techniques are favored for models with numerous degrees of freedom where direct techniques have high storage requirements. Classical iterative techniques such as Gauss-Seidel (GS) are robust due to guaranteed convergence and algorithmic simplicity. Performance of iterative techniques chiefly depends on system scale and stiffness matrix properties – which are influenced by structural configuration. However, it is possible to adjust an iterative algorithm such that its speed is greatly enhanced for a certain class of structural configurations. This paper presents an adjusted GS solver, the “Constrained Gauss-Seidel” (CGS), which has been formulated to solve typical multi-story structures with enhanced speed. The innovation in CGS comes from the adoption of a diaphragmatic relaxation mechanism which results in dividing the equations into two groups to optimally deal with the different unknown types. In this paper, the concept and algorithm of the newly developed CGS method are elucidated. Then, 16 practical examples are solved to assess the solving speed of CGS against other iterative methods – GS and Modified Gauss-Seidel (MGS, MGS*). The convergence speed of CGS reached 33 times, 3.7 times, and 2 times those of GS, MGS, and MGS* respectively.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88539744","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

Corner problem for the boundary integral method 拐角问题为边界积分法

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-05-25 DOI: 10.1680/jencm.22.00046

R. J. Sobey

引用次数: 0

Award-winning papers in 2021 2021年获奖论文

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-03-01 DOI: 10.1680/jencm.2023.176.1.48

引用次数: 0

Engineering and Computational Mechanics: Referees 2022 工程与计算力学:裁判员2022

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-03-01 DOI: 10.1680/jencm.2023.176.1.49

引用次数: 0

Vortex-induced vibration analysis of submerged floating tunnel tension legs 沉水浮式隧道张力腿涡激振动分析

IF 1.1

Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics Pub Date : 2023-02-24 DOI: 10.1680/jencm.21.00025

Z. Su, Shengnan Sun, Yushuo Lu, Yulong Pan

引用次数: 0