Developments in the Built Environment最新文献

Extending Information Delivery Specifications for digital building permit requirements 扩展数字建筑许可要求的信息交付规范

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-29 DOI: 10.1016/j.dibe.2024.100560

引用次数: 0

Effect of shell composition on watertightness and mechanical performance of cement-based capsules used as self-healing additives of cement 外壳成分对用作水泥自愈合添加剂的水泥基胶囊的水密性和机械性能的影响

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-28 DOI: 10.1016/j.dibe.2024.100565

{"title":"Effect of shell composition on watertightness and mechanical performance of cement-based capsules used as self-healing additives of cement","authors":"","doi":"10.1016/j.dibe.2024.100565","DOIUrl":"10.1016/j.dibe.2024.100565","url":null,"abstract":"<div><div>The aim of this work is the development of cementitious macro-capsules for self-healing cement and concrete materials. Emphasis is placed on shell properties, including size, thickness, strength, and volume to active component ratio. This enhancement is aimed at protecting the healing agent and ensuring adequate reactivity upon crack formation, surpassing survivability considerations. To this direction, core/shell particles have been produced following the pan-coating method, while different types and concentrations of setting acceleration solutions for the shell stabilization were studied. The formation of core-shell capsules encompasses the formation a spherical core through agglomeration, followed by simultaneous spraying of cement powder and a setting acceleration solution for the shell formation, under continuous rotation. The microstructural characteristics of the shell were studied through scanning electron microscopy (SEM), while the reactivity of the protected core (reactive agent) inside the hardened mortar mixtures was evaluated using thermogravimetric analysis (TGA). Moreover, the crushing load of the capsules under compression and their survivability during mixing process were examined and interpreted in relation to their diameter, circularity, and shell thickness.</div><div>The results revealed the ability of the encapsulation methodology proposed to tailor the shell properties and modify the capsule properties so as satisfy the requirements of different applications. The use of setting accelerators during shell formation proved essential for enhancing the density and the strength of the shell layer. As a consequence, this leads to macro-scale capsules with elevated survivability rate and core reactivity.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physicochemical properties of CO2-cured belite-rich cement with electric arc furnace reduction slag as a partial replacement 部分替代电弧炉还原渣的二氧化碳固化富褐铁矿水泥的物理化学特性

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-24 DOI: 10.1016/j.dibe.2024.100564

引用次数: 0

Experimental modal identification of a pedestrian bridge through drive-by monitoring integrated with shared-mobility vehicles 通过与共享交通车辆相结合的驾驶式监测，对一座人行天桥进行试验性模式识别

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-24 DOI: 10.1016/j.dibe.2024.100562

{"title":"Experimental modal identification of a pedestrian bridge through drive-by monitoring integrated with shared-mobility vehicles","authors":"","doi":"10.1016/j.dibe.2024.100562","DOIUrl":"10.1016/j.dibe.2024.100562","url":null,"abstract":"<div><div>In the context of improving resilience in transport infrastructure, an emerging approach of indirect structural health monitoring is gaining attention, known as drive-by monitoring, instrumenting a vehicle with sensors to evaluate the bridges it crosses. However, their effectiveness has predominantly been investigated in ideal scenarios, with actual real-world applications being quite scarce. The research presented in this paper explores the feasibility of combining two routes: (1) fleet emissions reduction and (2) transport resilience enhancement, through drive-by monitoring integrated with shared mobility, including electric mobility scooter and bicycle. The information from drive-by data collected from shared mobility can give valuable information on critical transport infrastructure (e.g., bridges) and such a drive-by database has the potential for network level infrastructure condition assessment. In this paper, two different drive-by roadmaps are investigated subject to the flexibility of the bridges, namely partially or fully drive-by monitoring. To validate the proposed roadmaps, a full-scale pedestrian bridge was chosen for drive-by testing, where smartphone sensors and specialised accelerometers are mounted on shared mobility for data acquisition. Experimental results demonstrate that (i) smartphone sensing can provide data with similar accuracy compared to specialised accelerometers, (ii) bridge frequencies can be easily obtained from temporarily parked shared mobility, with a maximum relative error of 1.05%, (iii) both the bridge frequencies and operational deflection shapes are successfully extracted from the moving shared mobility by using variational mode decomposition and filtering techniques, and shared mobility's GPS data along with moving speeds are collected for potential vehicle positioning and drive-by database updating.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing dynamic mechanical properties of cemented lithium mica tailings backfill with alkaline rice straw fibers: Experimental investigation and microscopic analysis 用碱性稻草纤维增强胶结锂云母尾矿回填的动态力学性能：实验研究与显微分析

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-24 DOI: 10.1016/j.dibe.2024.100563

引用次数: 0

A unified object and keypoint detection framework for Personal Protective Equipment use 个人防护设备使用的统一对象和关键点检测框架

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-19 DOI: 10.1016/j.dibe.2024.100559

{"title":"A unified object and keypoint detection framework for Personal Protective Equipment use","authors":"","doi":"10.1016/j.dibe.2024.100559","DOIUrl":"10.1016/j.dibe.2024.100559","url":null,"abstract":"<div><div>Accurately detecting whether workers wear Personal Protective Equipment (PPE) in real time plays an important role in safety management. Previous studies mainly used multiple models jointly or only object detection for wearing relationship judgments. This makes it difficult to provide real-time, accurate detection of security relationships. Therefore, this paper proposes safe-wearing detection rules and a novel multi-targets and keypoints detection framework (MTKF), which is capable of accomplishing multiple classes of targets and keypoints detection simultaneously in one-stage, to get more accurate results. In order to improve the performance in the PPE and worker keypoints detection in challenging construction scenes, the detection head transformation strategy, mix group shuffle attention (MGSA) module, and the improved dual and cross-class suppression algorithm (DC-NMS) are proposed. The experimental results are implemented on one established dataset (Joint dataset) and two public datasets (SHWD and COCO), which conduct a comprehensive evaluation in multiple dimensions. Compared to the baseline model, our method improves the mAP by 2.6%–7.1%, reduces the number of parameters by at least 70%, and is able to achieve an inference speed of 155 fps.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Catenary mechanism in steel columns under extreme lateral loading: A basis for building progressive collapse analysis 极端侧向荷载下钢柱的导柱机制：建筑物渐进式倒塌分析的基础

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-19 DOI: 10.1016/j.dibe.2024.100556

引用次数: 0

Experimental investigation on reducing the interface adhesion of concrete and formwork via electroosmosis approach 通过电渗法减少混凝土和模板界面粘附力的实验研究

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-18 DOI: 10.1016/j.dibe.2024.100561

引用次数: 0

Improving construction site efficiency through automated progress monitoring of underground pipe installation sites using image color analysis of iPhone LiDAR camera data 利用 iPhone LiDAR 相机数据的图像颜色分析，对地下管道安装现场进行自动进度监测，从而提高施工现场效率

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-18 DOI: 10.1016/j.dibe.2024.100557

引用次数: 0

Grain-size composition effect on flexural response and pore structure of cementitious tail-rock fills with fiber reinforcement 粒度组成对纤维加固水泥基尾岩填料挠曲响应和孔隙结构的影响

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-18 DOI: 10.1016/j.dibe.2024.100558

引用次数: 0