Architectural Engineering Commons^™

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 …

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 …

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 …

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 …

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 …

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 …

Asce's Response To The Pandemic: Execution Of A Remote Exceed Teaching Workshop, Kelly Salyards, Allen Estes, Camilla M. Saviz, Patricia Clayton, Julian Ly Davis, Corinna Marie Fleischmann, Tonya Lynn Nilsson, Pinar Omur-Ozbek, Fethiye Ozis, Monica Palomo, Carolyn M. Rodak, Cassandra Rutherford, Cristina Torres-Machi, Dion Karean Coward, Leslie Nolen

Architectural Engineering

The American Society of Civil Engineers (ASCE) Excellence in Civil Engineering Education (ExCEEd) Teaching Workshop (ETW) started in 1999 and has produced 1035 graduates from 266 colleges and universities throughout the world. ASCE has conducted 44 week-long, inperson workshops without interruption for over two decades. The ExCEEd graduates returned to their home universities and applied the lessons of this workshop to the classes they teach. The details and long-term benefits of the ETW have been reported in many venues.

In Spring 2020, the COVID-19 pandemic swept the nation and remained a persistent threat throughout 2021. As a result, the in-person …

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 …

Designs Of Abrasion Resistant And Durable Concrete Pavements Made With Scms For Cold Climates, Diane Murph, Jun Liu, Jenny Liu

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Rutting from studded tire wear is a typical pavement distress in cold climates such as that of Alaska and other northern states. Current state-of-the-art advancements in material technology and concrete pavement design have allowed for implementation of improved materials and concrete pavement sections that are more resistant to rutting. The addition of supplementary cementitious materials (SCMs) has been identified as one effective way to produce concrete pavements with better abrasion resistance. The objective of this study was to identify and develop concrete pavement mix designs containing SCMs that can provide excellent abrasion resistance and durability to address rutting from studded …

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 …

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, …

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 …

Designing With Force-Transfer Shear Walls: A Stiff Task To Achieve Better Performance And Cost Savings, Michael Deigert, John W. Lawson

Architectural Engineering

Wood-framed structural panel shear walls designed using the Force Transfer Around Openings (FTAO) method have become a very popular option for engineers, especially in areas with high lateral force requirements. The need for more affordable housing in metropolitan areas is leading to larger and taller multi-family residential buildings, and these typically wood-framed structures can benefit from the innovative approach behind FTAO design methodology. But do engineers have all the tools they need to accurately determine the stiffness of these walls and the associated lateral force required for their design.

Center For Centering: Analysis Of A Modular Timber Dome, Lucas J. Brown

Architectural Engineering

Analysis of a modular timber dome with focus on inductive, sensory, social, and environmental aspects.

Same Polytechnic College Tanzania Build 2022, Paulina Robles, Anna Yamauchi, Surina Marwaha, Tia Kelly, Dillon Schneider, Audrey Hoang, Connor Gilligan, Jennifer Viveros, Jenna Beutelschies, Robert Hardwick

Architectural Engineering

In collaboration with The Mbesese Initiative for Sustainable Design, the Cal Poly senior project team has designed, engineered, and prepared construction documents for a new vocational training college in Same, Tanzania, a rural area in the Mt. Kilimanjaro region. Upon its completion, the college will offer quality and practical educational opportunities for up to 1,200 students; in the interim, individual structures will be occupied immediately, adding value to the community throughout the construction process. The campus will house continuing educational programs, sports and agriculture fields, as well as hotels and other community-facing structures.

Structural Design Of A New Reaction Frame For High Bay Laboratory, Cassidy A. Sutton, Adelaide Albro

Architectural Engineering

The Cal Poly High Bay Testing Lab recently acquired hydraulic actuators for structural testing. The actuators are used for performing force and displacement tests on structural specimens designed and built by students and faculty. The existing frame that the old actuators mount to did not have enough capacity to accommodate the amount of force that the new actuators are capable of. New reaction frames were needed to be designed and constructed so the new actuators could be used to their full potential. The following report explores two different options for possible reaction frames in the lab. Both options have a …

Guidelines For The Eeri Seismic Design Competition, Kate Robinson

Architectural Engineering

The Earthquake Engineering Research Institute (EERI) has been dedicated to exposing undergraduate students to the wide range of interdisciplinary subjects related to earthquake engineering through the Seismic Design Competition. In 2022, California Polytechnic State University, San Luis Obispo (Cal Poly) sent 14 students to Salt Lake City, Utah for the competition – to compete with 31 other teams who all tackled the competition problem statement uniquely. The 2022 team was tasked with the research, design, analysis, and construction of a new structure to be built in downtown Salt Lake City, with the goal of replicating the design sequence of real-world …

Sage Garden Pavilion Shade Structure, Anthony Razouk Karroum, Manuel Bermudez, Matthew Kilbride, Sarah Holt, Marisa Martineau

Architectural Engineering

Form finding, testing, and construction of funicular double-layered shells in an interdisciplinary format with a focus on designing a shade structure for the San Luis Obispo Botanical Garden Children’s Pavilion. In the process, challenges such as connection design, materiality, storage, and more are explored and refined in relation to shell structures.

Improving Interprofessional Environmental Health Education Using The Leave No One Behind Framework, Daniel B. Oerther, Sarah E. Oerther

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

Wavelet Power And Shannon Entropy Applied To Acoustic Emission Signals For Corrosion Detection And Evaluation Of Reinforced Concrete, Jinrui Zhang, Ziye Kang, Dongshuai Hou, Biqin Dong, Hongyan Ma

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Acoustic emission (AE) signals detected from corrosion test on a steel reinforced concrete beam subjected to the coupling effects of corrosive wet-dry cycles and static load are analyzed by power spectral density, wavelet transform, and Shannon entropy. The degradation process of the corroded reinforced concrete beam can be divided into four stages on the basis of the accumulated event number (AEN). Due to the difference of material properties, steel reinforcement and concrete matrix have distinguished AE features. The time-frequency characteristics of AE signals can reflect the microstructural degradation mechanism of steel corrosion and concrete cracking. The corrosion evaluation entails investigating …