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Experimental Study On Local Bond Stress-Slip Relationship In Self-Compacting Concrete, Marian Sabau, Ioan Pop, Traian Onet 2016 Universidad de la Costa

Experimental Study On Local Bond Stress-Slip Relationship In Self-Compacting Concrete, Marian Sabau, Ioan Pop, Traian Onet

Marian Sabau

This paper summarizes the results of an experimental study on local bond stress-slip relationship of deformed reinforcing bars embedded in self-compacting concrete, considering the effect of concrete confinement by transverse reinforcement. In this study were cast 104 specimens by using self-compacting concrete and vibrated concrete. Pull-out tests were performed on deformed bars with short anchorage length (ld ≤ 5∅). The parameters analyzed were the concrete type, the confining reinforcement, the bar diameter and the anchorage length of bar. The results of this study showed that the ultimate bond strength was higher for self-compacting concrete compared to vibrated concrete, and the slip ...


Aggregate Shape Characterization Using Digital Image Processing, Norbert H. Maerz, David Newton Richardson 2016 Missouri University of Science and Technology

Aggregate Shape Characterization Using Digital Image Processing, Norbert H. Maerz, David Newton Richardson

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

Aggregates must meet certain specifications to be acceptable in asphalt and concrete applications. Among these are specifications that deal with the various aspects of aggregate shape, including flatness and elongation and aggregate angularity. The current practice for ensuring those specifications is the use of manual-mechanical tests. These tests are time consuming, labor intensive and subjective. In addition, tests such as the compacted or uncompacted voids tests (Figure 1), are taken to be a shape (angularity) indicator, even thought the measured quantify is the void ratio. This report describes a prototype of an automated digital video image analysis system that measures ...


A Fixed Platform Topside Piping System Strength Analysis Under Dynamic Pigging/Slugging Loads, Heng Gu, Zhongwei Li 2016 Rexa Inc.

A Fixed Platform Topside Piping System Strength Analysis Under Dynamic Pigging/Slugging Loads, Heng Gu, Zhongwei Li

Heng Gu

This paper presents the strength analysis of a fixed platform topside piping system under dynamic
pigging/slugging load. Flow assurance analysis by using OLGA provided the flow history in each pipe. Then the dynamic loads at each pipe elbow were added by time sequence onto ANSYS model. The analysis has shown overstressed region under new pigging/slugging loads and proposed modification plan to reduce the stress.


Survival Analyses For Bridge Decks In Northern United States, Habib Tabatabai, Chin-Wei Lee, Mohammad A. Tabatabai 2016 University of Wisconsin-Milwaukee

Survival Analyses For Bridge Decks In Northern United States, Habib Tabatabai, Chin-Wei Lee, Mohammad A. Tabatabai

Civil and Environmental Engineering Faculty Articles

The use of deicing salts in northern regions of the United States is a major contributor to the long-term deterioration of bridge decks. In this study, the 2008 U.S. National Bridge Inventory (NBI) records were used to develop survival models for non-reconstructed bridge decks in six northern states of Minnesota, Wisconsin, Michigan, Ohio, Pennsylvania, and New York. The hypertabastic accelerated failure model was used to develop survival (reliability) and hazard (failure rate) functions for all six states. The NBI parameters included were the deck rating, type of superstructure (concrete or steel), deck surface area, age, and average daily traffic ...


State-Of-The-Practice Review Of Maintenance Closure Structures For Large Spillway Gates, C. M. Johnson, R. T. Indri, F. G. Snider, S. M. Planck, K. F. De Lapp 2016 Schnabel Engineering

State-Of-The-Practice Review Of Maintenance Closure Structures For Large Spillway Gates, C. M. Johnson, R. T. Indri, F. G. Snider, S. M. Planck, K. F. De Lapp

6ᵗʰ International Symposium on Hydraulic Structures

Maintenance, remediation, and inspection of large spillway gates are best performed in a dry, dewatered state due to reduced overall cost, worker safety, and improved work quality. Provision for gate dewatering has become a key design consideration for new spillways. Unfortunately, many existing spillways were not originally constructed with gate dewatering capabilities. Therefore, maintenance and inspection work has often been scheduled during planned drawdowns or seasonally low reservoir levels. However, for operators of hydroelectric, flood control, water supply, and multi-purpose dams, artificial drawdowns can significantly impact operations, flood protection, downstream habitat, and revenue generation. Aging gates deteriorate and require significant ...


Folsom Dam Auxiliary Spillway – Design Innovations And Construction Lessons Learned, C. Y. Wan, C. M. Nolan 2016 US Army Corps of Engineers

Folsom Dam Auxiliary Spillway – Design Innovations And Construction Lessons Learned, C. Y. Wan, C. M. Nolan

6ᵗʰ International Symposium on Hydraulic Structures

The new Folsom Dam Auxiliary Spillway gated Control Structure, part of the overarching Joint Federal Project, was recently completed. To make operation and maintenance activities for this activity more user-friendly, this project implemented innovative designs, and a select few related to the tainter gate (seals, dogging system, and anchor inspection access) are presented in this paper. This project also provided additional monitoring capacity to the trunnion anchors, both during and post-construction, both physical and data, with great results. Further, this paper discusses some lessons learned on tainter gate specifications during gate construction and installation. Building and bridge construction specifications were ...


Durability-Based Optimal Design Methodology For Rc Members In Corrosive Environment, Saeid A. Alghamdi, Shamsad Ahmad, Adamu Lawan 2016 King Fahd University of Petroleum & Minerals

Durability-Based Optimal Design Methodology For Rc Members In Corrosive Environment, Saeid A. Alghamdi, Shamsad Ahmad, Adamu Lawan

International Conference on Durability of Concrete Structures

No abstract provided.


Retrofitting Adobe Buildings, Ashley V. Gaur, Jessica E. Ellis 2016 California Polytechnic State University, San Luis Obispo

Retrofitting Adobe Buildings, Ashley V. Gaur, Jessica E. Ellis

Architectural Engineering

No abstract provided.


Broad Street Apartments, Carla Alejandra Simental, Viviana C. Sanchez 2016 California Polytechnic State University, San Luis Obispo

Broad Street Apartments, Carla Alejandra Simental, Viviana C. Sanchez

Architectural Engineering

No abstract provided.


The Design And Construction Of A Rear Bumper With Incorporated Spare Tire Rack, Alan C. Isaacson 2016 California Polytechnic State University, San Luis Obispo

The Design And Construction Of A Rear Bumper With Incorporated Spare Tire Rack, Alan C. Isaacson

BioResource and Agricultural Engineering

This senior project outlines the design and construction of a rear bumper with incorporated spare tire and equipment rack for a 1946 Willys CJ2A Jeep. The spare tire rack is capable of swinging out away from the vehicle to allow for the use of the vehicle’s tailgate. The bumper was designed for strength, functionality and aesthetic qualities alike. Additionally, the bumper design considered all vehicle codes and regulations.


Development Of A Transition Between An Energy-Absorbing Concrete Barrier And A Rigid Concrete Buttress, Tyler Schmidt 2016 University of Nebraska-Lincoln

Development Of A Transition Between An Energy-Absorbing Concrete Barrier And A Rigid Concrete Buttress, Tyler Schmidt

Civil Engineering Theses, Dissertations, and Student Research

From 2010 to 2015, MwRSF researchers developed the RESTORE barrier, which is a restorable MASH TL-4 median barrier with a steel and concrete rail supported by elastomer posts and steel skids. The research effort reported herein describes the initial development of a transition from the RESTORE barrier to a rigid TL-4 concrete buttress.

The previously-developed RESTORE barrier LS-DYNA model was validated against three full-scale vehicle crash tests. Several design concepts were generated through a series of brainstorming efforts. The primary transition concept consisted of a pin and loop connection between the RESTORE barrier and rigid concrete buttress, which was designed ...


Experimental Building Demonstration Model With Viscous Fluid Dampers, Blake Thomas Reeve, Brianna Jean Kufa, Aden Malek Stepanians, Sophie Carmion Ratkovich 2016 California Polytechnic State University, San Luis Obispo

Experimental Building Demonstration Model With Viscous Fluid Dampers, Blake Thomas Reeve, Brianna Jean Kufa, Aden Malek Stepanians, Sophie Carmion Ratkovich

Architectural Engineering

The Architectural Engineering major places a heavy emphasis on structural dynamics and the role of wind and seismic loading in building analysis and design. Buildings of high importance that are critical to community function, such as hospitals, often utilize supplemental damping devices like supplemental viscous fluid dampers or base isolators to reduce the overall demands on the structural system. The design and analysis of these dampers are typically not taught at the undergraduate level, and is frequently performed by mechanical engineers, in lieu of structural engineers.

To better understand and research building behavior with supplemental damping devices, our multi-disciplinary team ...


Structural Calculations For Nepal Vocational Learning Center, Nicholas Petrarca 2016 California Polytechnic State University, San Luis Obispo

Structural Calculations For Nepal Vocational Learning Center, Nicholas Petrarca

Architectural Engineering

This project goal is to build a Leadership Vocational School for youth, women, differently abled, and local leaders of rural and Kathmandu Nepal. The client for this project is an organization called Sakcham Rural Nepal and they partnered with a humanitarian organization called Journeyman International to find Architecture and Architectural Engineering students to design a safe, attractive and functional building to fit their needs.


Recent Developments And Applications Of Composite Railway Sleepers, Wahid Ferdous, Allan Manalo, Thiru Aravinthan, Alex Remennikov 2016 University of Southern Queensland

Recent Developments And Applications Of Composite Railway Sleepers, Wahid Ferdous, Allan Manalo, Thiru Aravinthan, Alex Remennikov

Wahid Ferdous

Several composite sleeper technologies have been developed in different parts of the world. These technologies have emerged as a potential alternative to timber sleepers. Different from steel and concrete, composite sleepers can be designed to mimic timber behaviour (an essential requirement for timber track maintenance), are almost maintenance free, and are more sustainable from an environmental perspective. This paper presents and compares the performance of currently available composite railway sleeper technologies with different amounts, length and orientation of fibres and including their application. The common challenges encountered in using composite sleepers are also discussed. Finally, potential approaches are suggested to ...


Seismic Design Of A Prestressed Concrete Bridge, Alperen Ozel 2016 University of New Orleans

Seismic Design Of A Prestressed Concrete Bridge, Alperen Ozel

University of New Orleans Theses and Dissertations

Latest advancements in software have become an indispensable tool in structural analysis. The main goal of this thesis is to examine dynamic responses of bridges in seismic activity with the help of such tool as CSi Bridge. Therefore, throughout this study, a prestressed concrete bridge model will be thoroughly designed. In the first section, the required materials and structural components will be introduced. The following section will cover calculations required for modeling. The actual modeling of the structure will be carried out in Section 3. In Section 4, the set of required analysis for seismic design such as modal, pushover ...


Performance Assessment Of Deteriorated And Retrofitted Steel Hp Piles, Steven T. Stauffer 2016 University of Nebraska-Lincoln

Performance Assessment Of Deteriorated And Retrofitted Steel Hp Piles, Steven T. Stauffer

Civil Engineering Theses, Dissertations, and Student Research

Deterioration of aging bridges can be attributed to an assortment of mechanisms throughout the structure, with remediation policies also varying. This study focused on assessing the validity of the Nebraska Department of Roads’ (NDOR) reinforced concrete encasement retrofit for corroded steel HP piles. Experiments were designed and conducted to test the capacity of the NDOR retrofit and evaluate failure limit states. Two pile locations were considered: abutment and pile bent. For each location there was a non-deteriorated, deteriorated, and retrofitted case. These cases represented the pile at key stages during its life. NDOR’s concrete encasement retrofit provided the required ...


Volume-Change Restraining Effects In Continuous Precast/Prestressed Bridge Girders, Athul Alex 2016 University of Nebraska-Lincoln

Volume-Change Restraining Effects In Continuous Precast/Prestressed Bridge Girders, Athul Alex

Civil Engineering Theses, Dissertations, and Student Research

A variety of design and construction practices are feasible when building precast concrete continuous bridges with long spans. Precast, prestressed concrete continuous bridges have been implemented by countries around the world. Although these bridges have been in service for many years, there has been limited verification of the ability of connection to provide the predicted continuity. Subsequently many states in the United States design the girders as simple spans for both dead and live loads without considering any moments developed by the connection. The effect of thermal expansion and contraction is hardly considered in the analysis, even though it is ...


Analysis Of Bolted Beam-Column Connections With Multiple Bolts Per Row And Column Web Stiffeners, Benjamin C. Sutherland 2016 bcsuther

Analysis Of Bolted Beam-Column Connections With Multiple Bolts Per Row And Column Web Stiffeners, Benjamin C. Sutherland

Civil Engineering Undergraduate Honors Theses

Bolted beam-column connections are a common moment connection used in the design of steel buildings. Existing design guides include design parameters for bolt configurations having one bolt on either side of the beam web for each row of bolts. There is potential for increasing connection strength by adding additional bolts on the outside of these rows. This addition could be useful in retrofit scenarios, or even in the design of new structures. In this research, finite element analysis is used to analyze various beam-column connections and t-stub connections. The modeling methods, research process, and conclusions are explained in the thesis ...


Towards A Fast Reconstruction Paradigm For Urban Environments In Developing Regions Affected By Natural Disasters, Christopher Maestri 2016 University of Arkansas, Fayetteville

Towards A Fast Reconstruction Paradigm For Urban Environments In Developing Regions Affected By Natural Disasters, Christopher Maestri

Civil Engineering Undergraduate Honors Theses

Natural disasters in developing regions often displace people from their homes, into temporary shelters. These temporary shelters often consist of single-story pre-assembled tents designed to provide short-term aid for individual families. Unfortunately, single-story temporary shelters are not sufficient for accommodating large displaced populations in urban settings due to issues of land overcrowding and disruption to utilities providing water sanitation and hygiene (WASH) services (along with many other issues).

This study investigates the feasibility of implementing a multi-story steel structure, constructed with multi-use structural members and special end connectors, into future relief efforts. A multi-use structural member is an element whose ...


A Review Of The Durability Aspects For Self-Compacting Concrete, Marian Sabau, Yamith Cantillo Mier, Traian Onet 2016 Universidad de la Costa

A Review Of The Durability Aspects For Self-Compacting Concrete, Marian Sabau, Yamith Cantillo Mier, Traian Onet

Marian Sabau

This article presents a literature review concerning the durability of self-compacting concrete (SCC), making a comparison between this new type of concrete and the vibrated concrete (VC). The degradation mechanisms that have been considered are: carbonation, chloride penetration, sulphate attack, frost durability and salt scaling, and fire resistance. The carbonation of SCC is not significantly deviating from the carbonation of VC. Cyclic wetting and drying in a chloride containing solution shows significantly lower chloride diffusion in SCC in comparison with VC. The initiation time for sulphate attack is prolonged in SCC compared with an equivalent VC due to a denser ...


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