Architectural Engineering Commons^™

Leveraging Lessons Learned From A Virtual Hands-On Outreach Program To Cultivate Diversity In The Next Generation Of Structural Engineers, Anahid Behrouzi, Nicole Buck, Sarah Navias

Architectural Engineering

A challenge that continues to face the structural engineering (SE) profession is the recruitment and retention of individuals from underrepresented minority (URM) groups, underscored over the years by findings reported on by the SE3 project committee. One approach to address this is by developing and conducting early outreach efforts with diverse populations of K-12 students, so they are aware of SE’s meaningful contributions to society and the intriguing technical problem- solving opportunities in this field. During these educational activities it is also important for young students to be exposed to engineering practitioner-educators who represent diverse backgrounds and whose lived experience …

Critical Evaluation Of Time And Cost Of Terrestrial Laser Scanning For Construction Automated Qa Analysis, Joao Rocha, Davitt Lamon

Capstone Reports

Many governments agencies and private owners are demanding up-to-date information related to the current conditions of their facilities. Conventional QA is time-consuming and inefficient; thus, 3D terrestrial laser scanning (TLS) technology has been adopted due to the fast speed and high accuracy in acquiring data. Automated QA analysis can reduce the labour and time needed, reduce the costs, and improve the overall project efficiency. However, very few research efforts have been made to study the benefits of the automated QA analysis in a quantitative way. The process of the TLS-based geometric QA based in an automated data analysis process is …

Rna-Interference As A Topical Pesticide, Eleanor Khochaba

Undergraduate Student Research Internships Conference

Tetranychus urticae are a species of pests that are very problematic in agricultural environments, as they cause lots of damage to a wide variety of crops. One step in figuring out a solution to this problem is through the use of RNA interference. After synchronizing the spider mites, they are treated with the dsRNA solution. The dsRNA is cleavage inside the mite, and the siRNA fragments then bind to a target gene in hopes of homologous sequence recognition leading to knockout/deregulation of the target gene. After treatment, the mites are observed for multiple variables, primarily fecundity and survival. If a …

Anti-Washout Concrete: An Overview, Hao Lu, Xiao Sun, Hongyan Ma

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Anti-washout concrete (AWC) is a special cement-based material that can be directly employed in underwater environments without dispersion. It was developed around 50 years ago, and more than 150 journal articles and technical reports have been published. This paper provides a holistic review about the basic fresh-state and hardened-state properties of the AWC, such as water (washout) resistance, consistency, bleeding and segregation resistance, mechanical properties, and durability, as well as relevant testing methods. The discrepancies between AWC's characteristics and those of conventional concrete are clearly presented. The mixture compositions, supplementary cementitious materials (SCMs), and other conditions that affect AWC's performance …

The Use Of Gpr To Investigate The Effect Of Steel Fiber Distribution On The Mechanical Behavior Of Frc, Paola Machado Barreto Manhães, José Tavares Araruna Júnior, Genda Chen, Neil Lennart Anderson, Erik Valloti Pereira, Flávio De Andrade Silva

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The present work focuses on the steel fiber distribution in self-consolidating concrete short beams. The objective is to assess the feasibility of the ground penetrating radar (GPR) in evaluating the homogeneity of fibers within concrete materials, for use in testing laboratories to study the modes of placing and compaction employed for preparing specimens during quality control or material development. Self-consolidating concrete beams were cast, tested, and evaluated. A GPR survey employing a concrete scanning system with a shielded 1.2 GHz center frequency was performed on self-consolidating casted short beams just before a monotonic four-point bending test was carried out. After …

Quantifying The Workability Of Calcium Sulfoaluminate Cement Paste Using Time-Dependent Rheology, Sukanta K. Mondal, Adam Welz, Carrie Clinton, Kamal Khayat, Aditya Kumar, Monday Uchenna Okoronkwo

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Poor workability is a common feature of calcium sulfoaluminate (CSA) cement paste. Multiple chemical admixtures, such as set retarders and dispersants, are frequently employed to improve the workability and delay the setting of CSA cement paste. A quantitative assessment of the compatibility, efficiency, and the effects of the admixtures on cement paste workability is critical for the design of an appropriate paste formulation and admixture proportioning. Very limited studies are available on the quantitative rheology-based method for evaluating the workability of calcium sulfoaluminate cement pastes. This study presents a novel and robust time-dependent rheological method for quantifying the workability of …

Professional And Organizational Leadership Role In Ethics Management: Avoiding Reliance On Ethical Codification And Nurturing Ethical Culture, Islam H. El-Adaway, Marianne Jennings

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The engineering profession has experienced some ethical cases that were rarely reported, scrutinized, or discussed because: they did not necessarily represent violations of existing codes even if they breached ethical principles; those within the organization were not prepared to take steps to address the issues or impose sanction; an/or some of the personnel associated with these cases resorted to silence to avoid being labeled as trouble-makers in their organizations and, perhaps, more broadly, in society. The goal of this paper is to heighten managerial awareness of ethical issues, interrelated ethical lapses, and appropriate responsive actions within professional engineering communities. As …

Llam-Mdcnet For Detecting Remote Sensing Images Of Dead Tree Clusters, Zongchen Li, Ruoli Yang, Weiwei Cai, Yongfei Xue, Yaowen Hu, Liujun Li

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Clusters of dead trees are forest fires-prone. To maintain ecological balance and realize its protection, timely detection of dead trees in forest remote sensing images using existing computer vision methods is of great significance. Remote sensing images captured by Unmanned aerial vehicles (UAVs) typically have several issues, e.g., mixed distribution of adjacent but different tree classes, interference of redundant information, and high differences in scales of dead tree clusters, making the detection of dead tree clusters much more challenging. Therefore, based on the Multipath dense composite network (MDCN), an object detection method called LLAM-MDCNet is proposed in this paper. First, …

Coupled Effect Of Fiber And Granular Skeleton Characteristics On Packing Density Of Fiber-Aggregate Mixtures, Naimeh Nouri, Masoud Hosseinpoor, Ammar Yahia, Kamal Khayat

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The addition of fiber to cementitious materials enhances mechanical performance but can reduce workability of the fiber-reinforced concrete (FRC) mixtures. This can be due to the negative effect of fibers on packing density (PD) of the fiber-coarse aggregate (F-A) combination. The performance of FRC, as a diphasic suspension, is dependent on the characteristics of both F-A (suspended-solid skeleton) and mortar (suspending liquid) phases. PD can reflect the voids within the F-A skeleton to be filled with mortar. An adequate optimization of the characteristics of the F-A skeleton can modify the performance of FRC in fresh and hardened states. The F-A …

Design, Integration, And Evaluation Of Iot-Based Electrochromic Building Envelopes For Visual Comfort And Energy Efficiency, Qingqing Sun

All Dissertations

Electrochromic glazing has been identified as the next-generation high-performance glazing material for building envelopes due to its dynamic properties, which allow the buildings to respond to various climate conditions. IoT technologies have improved the sensing, communication, and interactions of building environmental data. Few studies have been done to synthesize the advancements in EC materials and building IoT technologies for better building performance. The challenge remains in the lack of compatible design and simulation tools, limited understanding of integration, and a paucity of evaluation measures to support the convergence between the EC building envelopes and IoT technologies. This research first explores …

Timber Buckling Restrained Brace, Faith Sharp, Armando Castaneda Jr

Architectural Engineering

The timber buckling-restrained brace (TBRB) experiment at California Polytechnic State University, San Luis Obispo (Cal Poly), began in 2018 with the goal of finding whether timber may provide proper restraint against buckling of a steel brace. The TBRB was motivated by the limited lateral force resisting systems (LFRS) available for low-to-mid-rise, type V construction; this system would provide strength and ductility at a scale and level of cost appropriate to timber construction.

Early research consisted of uniaxial component testing, where researchers played with the balance between the core brace design and utilization of timber casings for buckling restraint, with minimal …

Ds-Menet For The Classification Of Citrus Disease, Xuyao Liu, Yaowen Hu, Guoxiong Zhou, Weiwei Cai, Mingfang He, Jialei Zhan, Yahui Hu, Liujun Li

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Affected by various environmental factors, citrus will frequently suffer from diseases during the growth process, which has brought huge obstacles to the development of agriculture. This paper proposes a new method for identifying and classifying citrus diseases. Firstly, this paper designs an image enhancement method based on the MSRCR algorithm and homomorphic filtering algorithm optimized by Laplacian (HFLF-MS) to highlight the disease characteristics of citrus. Secondly, we designed a new neural network DS-MENet based on the DenseNet-121 backbone structure. In DS-MENet, the regular convolution in Dense Block is replaced with depthwise separable convolution, which reduces the network parameters. The ReMish …

Commercial Janus Fabrics As Reusable Facemask Materials: A Balance Of Water Repellency, Filtration Efficiency, Breathability, And Reusability, Steven Cheng, Weixing Hao, Yuchen Wang, Yang Wang, Shu Yang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Facemasks as personal protective equipment play a significant role in helping prevent the spread of viruses during the COVID-19 pandemic. A desired reusable fabric facemask should strike a balance of water repellency, good filtration efficiency (FE), breathability, and mechanical robustness against washing cycles. Despite significant efforts in testing various commercial fabric materials for filtration efficiency, few have investigated fabric performance as a function of the fiber/yarn morphology and wettability of the fabric itself. In this study, we examine commercial fabrics with Janus-like behaviors to determine the best reusable fabric facemask materials by understanding the roles of morphology, porosity, and wettability …

Mdam-Drnet: Dual Channel Residual Network With Multi-Directional Attention Mechanism In Strawberry Leaf Diseases Detection, Tingjing Liao, Ruoli Yang, Peirui Zhao, Wenhua Zhou, Mingfang He, Liujun Li

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The growth of strawberry plants is affected by a variety of strawberry leaf diseases. Yet, due to the complexity of these diseases' spots in terms of color and texture, their manual identification requires much time and energy. Developing a more efficient identification method could be imperative for improving the yield and quality of strawberry crops. To that end, here we proposed a detection framework for strawberry leaf diseases based on a dual-channel residual network with a multi-directional attention mechanism (MDAM-DRNet). (1) In order to fully extract the color features from images of diseased strawberry leaves, this paper constructed a color …

Quantification Of The State Of Practice Of Offsite Construction And Related Technologies: Current Trends And Future Prospects, Rayan H. Assaad, Islam H. El-Adaway, Makarand Hastak, Kim Lascola Needy

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Although some researchers and practitioners have perceived that the current reliance on offsite construction methods is high, other studies have hypothesized that the use of offsite construction techniques is still considered to be somehow limited. To this end, this paper aims to quantify the state of practice of offsite construction in terms of current trends and future prospects for the overall industry as well as the following main sectors: industrial, building and commercial, and infrastructure. First, a questionnaire was formed, pilot-tested, distributed, and completed by 100 construction practitioners. Second, the questionnaire's internal and external validity and reliability were examined using …

Life Cycle Cost Analysis Of High Friction Surface Treatment Applications, Eslam Deef-Allah, Korrenn Broaddus, Magdy Abdelrahman

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Life cycle cost analyses for high friction surface treatment (HFST) applications were executed relying on a Microsoft Excel program developed by the researchers. Calcined bauxite (CB), five CB alternatives, and epoxy binder were utilized in the HFST applications. The aggregates' performances were evaluated through the aggregate image measurement system (AIMS) before and after Micro-Deval polishing. The performance of the HFST applications was evaluated by the dynamic friction tester (DFT) and British pendulum (BP). The major purpose of this program was to present a rational method for converting different input data (project and material specifics) to comparable output data (net present …

The Impact Of Offsite Construction On The Workforce: Required Skillset And Prioritization Of Training Needs, Rayan H. Assaad, Islam H. El-Adaway, Makarand Hastak, Kim Lascola Needy

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Offsite construction has showed great potential in addressing many of the industry's problems. While multiple research efforts have been directed at examining different offsite construction aspects, few studies investigated the workforce-related aspects. Therefore, this study aims to address this knowledge gap by examining the impact of offsite construction on the workforce, as represented by the following five workforce categories: offsite, onsite, engineering and design, construction and fabrication, and administrative workforce. To this end, this paper (1) determined the impact of offsite construction on the skillset (reskilling or upskilling) and the demand (shrink or growth) for the offsite and onsite construction …

A Proactive Risk Assessment Framework To Maximize Schedule Benefits Of Modularization In Construction Projects, Mohamad Abdul Nabi, Islam H. El-Adaway

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Various studies developed models and decision support tools to assess the feasibility and optimize the use of modularization. However, none has explored the schedule benefits of modular construction. This paper fills this knowledge gap. To this end, the authors completed the following: (1) analyzed the criticalities of the various modular risk factors on potential schedule savings using data collected from 48 industry professionals, (2) investigated the schedule savings associated with the use of modularization using data collected from 68 modular construction projects, and (3) developed an interrelated assessment model to calculate the schedule savings of using modularization. The provided model …

The Effect Of Sodium Polymethacrylate On The Rheology Of The Positive Paste And Performance Of The Lead-Acid Battery, Julian Kosacki, Dimitri Feys, Fatih Dogan

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Due to its rheological properties, positive lead-acid battery paste can be difficult to spread on lead current collectors accurately and efficiently under industry machinery and setting. Sodium polymethacrylate dispersant was studied as an effective positive paste additive that could lower the yield stress of the paste without affecting paste density and battery performance. Under a four-blade vane rheometer setup, stress growth and oscillatory amplitude strain sweep experiments evaluated the rheological properties of positive paste with the addition of varying amounts of sodium polymethacrylate. Further, the electrochemical effects of sodium polymethacrylate were also evaluated in 2V batteries by testing positive active …

Hands-On Earthquake Engineering Curriculum For The Virtual Classroom, S. Navias, N. Buck, Anahid A. Behrouzi

Architectural Engineering

During Summer 2021, five week-long virtual earthquake engineering sessions were offered in the Cal Poly Engineering Possibilities in College (EPIC) summer program. Typically, this is a residential program comprised of faculty-led workshops in various engineering fields to provide pre-college experiences to students, particularly from underrepresented backgrounds. The challenge posed by remote learning, due to the global pandemic, was to continue providing educationally effective hands-on activities. To accomplish this, the instructor team designed, fabricated, and shipped over 120 mail-home engineering kits for students to assemble a shake table, build and retrofit a structural model, as well as collect and analyze data …

The Fundamentals And Obstacles Of Religious And Cultural Tourism Development In Hadhramout Governorate: A Case Study Of Tarim City, Abdulaziz Al-Naggar, Sabri Al-Tarimi, Fahd Jowher

Journal of the Arab American University مجلة الجامعة العربية الامريكية للبحوث

This research discusses the fundamentals and obstacles of the religious and cultural tourism development in Hadhramout Governorate, as one of the most important types of tourism. The aim of this study was to determine the basic requirements needed by this type of tourism through studying the elements of developing the religious and cultural tourism in Tarim City. The city was chosen because of its famous palaces, castles, and historical forts. Tarim is also famous for its prominent scientific and religious center founded in the 4^th century A.H., the presence of libraries, such as the Al-Kaf Library, the religious institutes(Rabat …

Creating A Development Framework: A Generic Lens For Public Markets’ Analysis And Development In Integration With Their Zone Of Influence Revitalization, Nourhan Ahmed

Theses and Dissertations

This thesis discusses how the development of public markets through a structured framework can be a catalyst for revitalizing its zone of influence. Public markets have always been marked by their rich experience, and their central role in towns, cities, and villages, as they have been vital engines for urban growth and cities formation since their prevalence. Needless to mention their role in entrepreneurship and their significance for the social development of neighborhoods. Nowadays, local governments are rediscovering the central role of public markets and are putting them under focus to catalyze the urban growth and neighborhoods revitalization by their …

“Top Trends And Challenges Of Digital Technologies To Enhance The Efficiency Of Building Thermal Insulation And The Reality Of Its Application In Riyadh, Saudi Arabia”, Abrar Nasser Hamdi, Ahmed Omar M.S. Mostafa

Emirates Journal for Engineering Research

تشكل التقنيات الرقمية إحدى أهم مظاهر التقدم الحضاري في القرن الحادي والعشرين والتي اثرت بشكل كبير علـى النتاج المعماري تصميماً وانشاءً سواء على مستوى تقنيات المواد، أو تقنيات التطبيقات الرقمية أو تقنيات الأجهزة الإلكترونية الرقمية التي تساعد في تحسين أداء المباني عموماً ورفع كفاءة أداء العزل الحراري على وجه الخصوص. وعلى الرغم من انتشار تطبيق تقنيات مواد البناء في العديد من المجالات التي ترتبط بالعزل الحراري الى جانب تطبيقها وقياس ادائها باستخدام بالتقنيات الرقمية في أغلب الدول المتقدمة، الا انها لم تصل الى المستوى المأمول في السوق المحلي بالمملكة وهو ما يمثل إشكالية البحث الرئيسية. ويهدف البحث إلى استكشاف أهم …

Mpc-Stanet: Alzheimer’S Disease Recognition Method Based On Multiple Phantom Convolution And Spatial Transformation Attention Mechanism, Yujian Liu, Kun Tang, Weiwei Cai, Aibin Chen, Guoxiong Zhou, Liujun Li, Runmin Liu

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Alzheimer's disease (AD) is a progressive neurodegenerative disease with insidious and irreversible onset. The recognition of the disease stage of AD and the administration of effective interventional treatment are important to slow down and control the progression of the disease. However, due to the unbalanced distribution of the acquired data volume, the problem that the features change inconspicuously in different disease stages of AD, and the scattered and narrow areas of the feature areas (hippocampal region, medial temporal lobe, etc.), the effective recognition of AD remains a critical unmet need. Therefore, we first employ class-balancing operation using data expansion and …

An Empirical Investigation Into Current And Future Overheating Frequency In Nzeb And Passivhaus Dwellings In Ireland, Evan Finegan

Theses

The European Performance of Buildings Directive (EPBD) 2011, ensures that all new Irish dwellings designed after 01st November 2019 are nearly zero energy (nZEB) dwellings. The Passive House (PH) standard has been the most commonly applied energy standard across the globe in recent decades, while overheating is identified as a growing issue in nZEB and PH dwellings. The EPBD requires all dwellings to be designed to reduce energy consumption, while considering general indoor climate conditions to avoid the negative effects of overheating. Overheating frequency simulations are not mandatory for dwellings under Irish legislation. Anticipated climate change trends will result in …

Trends And Challenges Of Parametric Design Techniques In Design Concepts Evaluation & Development, And Its Application In Riyadh, Albaraa Ibraheem Ghabban, Ahmed Omar M.S. Mostafa

Emirates Journal for Engineering Research

The continuous development and transformation of modeling and design techniques and tools lead to the emergence of more efficient techniques that support the architects through the design process. In light of that, the parametric design field is considered a state-of-art of such techniques that could support architects in making the most suitable and effective design decisions in early design stages by testing a large number of design solutions and alternatives using computational models. When considering the tendency of KSA, within its vision 2030, to digital transformation and increase the digital applications in all fields, the lack of sufficient data about …

Feasibility Study On Novel Fire-Resistant Coating Materials, Anyou Zhu, Hanli Wu, Jenny Liu

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Over the last few decades, wildfires in the United States have caused severe damage and property losses. As more houses are being built in areas prone to wildfire, enhancing the fire resistance of structures and buildings is critical and in great need. This paper presents a preliminary study to explore and develop some innovative surface-bonded fire-resistant coating materials for this purpose. The feasibility of these materials [i.e., high performance cement mortar (HPCM), geopolymer mortar (GPM), and magnesium phosphate cement mortar (MPCM)] was assessed considering the workability, adhesion to structure surface, and fire property. The Taguchi-based mix designs of HPCM, GPM, …

Comparing Oranges Versus Grapes As A Metaphor Of The Nurse+Engineer, Daniel B. Oerther, Sarah Oerther

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

Mechanisms Affecting Viscosity Of Cement Paste Made With Microfines Of Manufactured Sand, Jiang Zhu, Jiaping Liu, Kamal Khayat, Xin Shu, Qianping Ran, Zhen Li

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Viscosity of cement-based materials incorporating manufactured sand is affected by the content and physical properties of the microfines in the sand. However, some of the mechanisms affecting the viscosity remain unclear. This paper investigates the effect of microfine type and content on the apparent viscosity (ηapp) and residual viscosity in/near pseudo-Newtonian regime (ηrespse−New) of cement pastes. Limestone (LS), slate (ST), and tuff (TF) microfines with different specific surface areas were investigated. Test results showed that, by deducting the greater contribution of yield stress to ηapp when using finer microfines, the increase of ηrespse−New at a given PCE dosage was mainly …

On Internal Resonance Analysis Of A Double-Cable-Stayed Shallow-Arch Model With Elastic Supports At Both Ends, Xiaoyang Su, Houjun Kang, Tieding Guo, Guirong Grace Yan

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In previous research on the nonlinear dynamics of cable-stayed bridges, boundary conditions were not properly modeled in the modeling. In order to obtain the nonlinear dynamics of cable-stayed bridges more accurately, a double-cable-stayed shallow-arch model with elastic supports at both ends and the initial configuration of bridge deck included in the modeling is developed in this study. The in-plane eigenvalue problems of the model are solved by dividing the shallow arch (SA) into three partitions according to the number of cables and the piecewise functions are taken as trial functions of the SA. Then, the in-plane one-to-one-to-one internal resonance among …