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Assessment Of 1991 Nehrp Provisions For Nonstructural Components And Recommended Revisions, Tsuteh Soong, Genda Chen, Z. Wu, R. H. Zhang, M. Grigoriu 2018 Missouri University of Science and Technology

Assessment Of 1991 Nehrp Provisions For Nonstructural Components And Recommended Revisions, Tsuteh Soong, Genda Chen, Z. Wu, R. H. Zhang, M. Grigoriu

Genda Chen

As one part of the 1994 update effort of the 1991 NEHRP provisions, the seismic design force formulas for nonstructural components as they exist in the 1991 provisions are critically assessed and some of their shortcomings are identified. Various levels of improvements to these formulas are then presented which, on the one hand, preserve the equivalent lateral force format for design applicability and, on the other, correct some of the deficiencies on the basis of analyses, experimental results and observation data from past earthquakes.

Based on different interpretations of the component seismic coefficients as well as different degrees of simplicity ...


Advancing Bridge Technology, Task 10: Statistical Analysis And Modeling Of Us Concrete Highway Bridge Deck Performance -- Internal Final Report, Omar Ghonima, Thomas Schumacher, Avinash Unnikrishnan, Adam Fleischhacker 2018 University of Delaware

Advancing Bridge Technology, Task 10: Statistical Analysis And Modeling Of Us Concrete Highway Bridge Deck Performance -- Internal Final Report, Omar Ghonima, Thomas Schumacher, Avinash Unnikrishnan, Adam Fleischhacker

Civil and Environmental Engineering Faculty Publications and Presentations

Concrete highway bridge deck repairs represent the highest expense associated with bridge maintenance cost. In order to optimize such activities and use the available monies effectively, a solid understanding of the parameters that affect the performance of concrete bridge decks is critical. The National Bridge Inventory (NBI), perhaps the single-most comprehensive source of bridge information, gathers data on more than 600,000 bridges in all fifty states, the District of Columbia, and the Commonwealth of Puerto Rico. Focusing on concrete highway bridge deck performance, this research developed a nationwide database based on NBI data and other critical parameters that were ...


Pedestrian Bridge Test Demonstration, Genda Chen, R. Zoughi 2018 Missouri University of Science and Technology

Pedestrian Bridge Test Demonstration, Genda Chen, R. Zoughi

INSPIRE-UTC Annual Meetings

The INSPIRE UTC, with permission and the cooperation of Missouri S&T Facilities Operations, is conducting research testing on the Computer Science Pedestrian Bridge through the end of September 2018. The technologies employed in the Pedestrian Bridge test include: microwave imaging, ground penetrating radar and impact-echo tests, hyperspectral, and thermal imaging.


Developing A Robotic Simulator And Video Games For Professional And Public Training, Sushil Louis 2018 University of Nevada, Reno

Developing A Robotic Simulator And Video Games For Professional And Public Training, Sushil Louis

INSPIRE-UTC Annual Meetings

Civil engineers are not educated with robotics. They need to be trained on the job with effective tools. The most recent simulation trainer that the PI has built is currently being used by the United States Navy to train surface warfare officers in decision making under stress. In a crowded in-port environment, the crew on a ship’s bridge is trained to probe and identify suspicious boat behavior within the port’s traffic pattern. Officers in charge of the simulation training lesson use software for high-level control of dozens of other ships, boats, and aircrafts that quickly react and adapt ...


Training Framework Of Robotic Operation And Image Analysis For Decision-Making In Bridge Inspection And Preservation, Ruwen Qin 2018 Missouri University of Science and Technology

Training Framework Of Robotic Operation And Image Analysis For Decision-Making In Bridge Inspection And Preservation, Ruwen Qin

INSPIRE-UTC Annual Meetings

Inspection and preservation of existing transportation infrastructure to extend their service life is an effective way of mitigating the pressure of steadily growing transportation demands on the aging infrastructure. Their current practice, though, represents one of the most costly operations in state departments of transportation.

The INSPIRE University Transportation Center will develop a remotely-controlled robotic platform that helps with these labor-intensive tasks and allows engineers to focus on decision-making processes. An important mission of INSPIRE is to leverage users’ capability of implementing, and interacting with, the robotic platform. Therefore, a long-term plan has been made to create a framework of ...


Autonomous Wall-Climbing Robots For Inspection And Maintenance Of Concrete Bridges, Jizhong Xiao 2018 The City College of New York

Autonomous Wall-Climbing Robots For Inspection And Maintenance Of Concrete Bridges, Jizhong Xiao

INSPIRE-UTC Annual Meetings

Since 2002, the PI’s group has developed four generations of wall-climbing robots for NDE inspection of civil infrastructure. These robots combine the advantages of aerodynamic attraction and suction to achieve a desirable balance of strong adhesion and high mobility. They don’t require perfect sealing and can thus move on smooth and rough surfaces, such as brick, concrete, stucco, wood, glass, and metal. For example, Rise-Rover uses two drive modules to carry their middle compartment with payload up to 450 N. Ground penetrating radar (GPR)-Rover and Mini GPR-Rover are custom designed to carry a GSSI’s GPR antenna ...


Climbing Robots With Automated Deployment Of Sensors And Nde Devices For Steel Bridge Inspection, Hung La 2018 University of Nevada, Las Vegas

Climbing Robots With Automated Deployment Of Sensors And Nde Devices For Steel Bridge Inspection, Hung La

INSPIRE-UTC Annual Meetings

The PI was a research scientist/faculty at Rutgers University who successfully developed in 2014 a Robotic Assisted Bridge Inspection Tool (RABIT) for bridge deck inspections. Other bridge elements, such as girders and columns, or even underside of bridge decks are difficult to access and remain a challenge for efficient inspection. Like visual inspection, current practices for bridge maintenance are equally time consuming and expensive. Automation of simple maintenance actions such as bearing cleaning and concrete sealing with robots will lead to a leap forward to the next-generation strategy of bridge maintenance.

This project aims to develop and prototype automated ...


Mobile-Manipulating Uavs For Sensor Installation, Bridge Inspection And Maintenance, Paul Oh 2018 University of Nevada, Las Vegas

Mobile-Manipulating Uavs For Sensor Installation, Bridge Inspection And Maintenance, Paul Oh

INSPIRE-UTC Annual Meetings

Mobile manipulating UAVs have great potential for bridge inspection and maintenance. Since 2002, the PI has developed UAVs that could fly through in-and-around buildings and tunnels. Collision avoidance in such cluttered near-Earth environments has been a key challenge. The advent of light-weight, computationally powerful cameras led to breakthroughs in SLAM even though SLAM-based autonomous aerial navigation around bridges remains an unsolved problem.

In 2007, the PI integrated a mobile manipulation function into UAVs, greatly extending the capabilities of UAVs from passive survey of environments with cameras to active interaction with environments using limbs. Mobile-manipulating UAVs have since been demonstrated to ...


Quantitative Bridge Inspection Ratings Using Autonomous Robotic Systems, Anil Agrawal 2018 The City College of New York

Quantitative Bridge Inspection Ratings Using Autonomous Robotic Systems, Anil Agrawal

INSPIRE-UTC Annual Meetings

The 2001 study sponsored by FHWA raised serious concern on the consistency and reliability of visual inspection. Although consistent ratings can be obtained with a good QA/QC program, based on a recent study by the PI, the concern for reliability of defect detection remains. With the adoption of the recent AASHTO Manuel for Bridge Element Inspection, the new inspection approach not only requires rating for bridge elements, but also the location and extent of deterioration. Since autonomous robotic systems generate an enormous amount of inspection data, deducing from the data to a simple rating along with the location and ...


Hyperspectral Image Analysis For Mechanical And Chemical Properties Of Concrete And Steel Surfaces, Genda Chen 2018 Missouri University of Science and Technology

Hyperspectral Image Analysis For Mechanical And Chemical Properties Of Concrete And Steel Surfaces, Genda Chen

INSPIRE-UTC Annual Meetings

A typical human eye will respond to wavelengths from approximately 400 to 700 nm. A hyperspectral camera can extend the wavelength to as high as 2500 nm. This extension will allow engineers to find objects, identify materials, and detect processes on structural surface, which cannot be done with visual inspection.

This project aims to develop an open-source catalogue of concrete and steel surfaces and their spectral/spatial features (discoloration, characteristic wavelength, roughness, texture, shape, etc.), extract spatial/spectral features of hyperspectral images, and develop/train a multi-class classification or regression classifier through machine learnings (supervised and/or semi-supervised), and validate ...


3d Microwave Camera For Concrete Delamination And Steel Corrosion Detection, R. Zoughi 2018 Missouri University of Science and Technology

3d Microwave Camera For Concrete Delamination And Steel Corrosion Detection, R. Zoughi

INSPIRE-UTC Annual Meetings

Corrosion of embedded steel reinforcement in concrete leads to concrete cracking and delamination, followed by increased salt and moisture permeation and further damage. Invisibility of the embedded rebar in combination with physical inaccessibility in elevated bridges presents a challenge in the assessment of RC bridge elements. Wideband (3D) microwave synthetic aperture radar (SAR) imaging techniques that can be integrated into a UAV offer a practical solution to overcome this challenge.

This project aims to develop and optimize a 3D microwave camera for bridge inspection on a UAV platform, quantify its performance for steel corrosion evaluation and concrete delamination detection in ...


Battery-Free Antenna Sensors For Strain And Crack Monitoring Of Bridge Structures, Yang Wang 2018 Georgia Institute of Technology

Battery-Free Antenna Sensors For Strain And Crack Monitoring Of Bridge Structures, Yang Wang

INSPIRE-UTC Annual Meetings

Fatigue cracks need to be monitored in fatigue critical elements. Previous research by the PI produced a radiofrequency identification (RFID) sensor prototype that can accurately measure tens of micro-strains in laboratory. The antenna sensor was made on a glass microfiber-reinforced polymer substrate. Although accurate for strain measurement and detection of fatigue cracks, the sensor performs less satisfactorily in field conditions since the substrate material (RT/duroid® 5880) is susceptible to thermal effect. In addition, a wireless interrogation distance by a general-purpose commercial RFID reader is limited to the order of meter, which is not desirable with the operation of a ...


Uav-Enabled Measurement For Spatial Magnetic Field Of Smart Rocks In Bridge Scour Monitoring, Genda Chen 2018 Missouri University of Science and Technology

Uav-Enabled Measurement For Spatial Magnetic Field Of Smart Rocks In Bridge Scour Monitoring, Genda Chen

INSPIRE-UTC Annual Meetings

Foundation scour is the main cause of bridge collapses in the U.S. In 2011, the principal investigator (PI) proposed smart rocks with embedded magnets for bridge scour monitoring. Once deployed around a bridge pier, smart rocks as field agents offer mission-critical information about the maximum depth of a scour hole developed around the bridge foundation – the key parameter that is used to assess foundation stability in engineering design and retrofit. Smart rocks have recently been deployed and tested at three bridge sites in California and Missouri. With multiple measurements, they can be located with an accuracy of 0.5 ...


Microwave Imaging For Corroded Rebars And Delamination In Concrete Structures, Matthew Dvorsky, Stephon Barker, Mohammad Tayeb Ahmad Ghasr, R. Zoughi 2018 Missouri University of Science and Technology

Microwave Imaging For Corroded Rebars And Delamination In Concrete Structures, Matthew Dvorsky, Stephon Barker, Mohammad Tayeb Ahmad Ghasr, R. Zoughi

INSPIRE-UTC Annual Meetings

Corrosion of embedded steel reinforcement bars (rebars) in concrete leads to concrete cracking and delamination, which in turn leads to increased salt and moisture permeation and further damage. This study aims to evaluate the effectiveness of microwave imaging for the characterization of this corrosionand delaminationof steel rebar embedded in concrete.


Deep Semantic 3d Visual Metric Reconstruction Using Wall-Climbing Robot, Liang Yang, Bing Li, Yong Chang, Jizhong Xiao 2018 The City College of New York

Deep Semantic 3d Visual Metric Reconstruction Using Wall-Climbing Robot, Liang Yang, Bing Li, Yong Chang, Jizhong Xiao

INSPIRE-UTC Annual Meetings

This project introduces an inspection method using a deep neural network to detect the crack and spalling defects on concrete structures performed by a wall-climbing robot. First, we create a pixel-level semantic dataset which includes 820 labeled images. Second, we propose an inspection method to obtain 3D metric measurement by using an RGB-D camera-based visual simultaneous localization and mapping (SLAM), which is able to generate pose coupled key-frames with depth information. Therefore, the semantic inspection results can be registered in the concrete structure 3D model for condition assessment and monitoring. Third, we present our new generation wall-climbing robot to perform ...


Bridge Resilience Assessment With Inspire Data, Yijian Albert Zhang, Reginald DesRoches, Iris Tien 2018 Georgia Institute of Technology

Bridge Resilience Assessment With Inspire Data, Yijian Albert Zhang, Reginald Desroches, Iris Tien

INSPIRE-UTC Annual Meetings

In this research, we proposed analytical models validated with numerical results to assess how inspection-collected data on corrosion can be used to update bridge models and predict performance under future events. A detailed investigation of the vulnerability of bridges due to corrosion at both component and global levels. The results show the impact of corrosion-induced degradation on the seismic fragility of reinforced concrete columns under various failure modes, e.g., flexural, shear, and lap-spliced failures. As increasing amounts of data are collected on the states of bridges, the results show how these data can be used to update bridge assessments ...


Integrated Fiber Optic Sensors For Strain, Temperature And Corrosion-Induced Mass Loss Measurement, Chuanrui Guo, Liang Fan, Genda Chen 2018 Missouri University of Science and Technology

Integrated Fiber Optic Sensors For Strain, Temperature And Corrosion-Induced Mass Loss Measurement, Chuanrui Guo, Liang Fan, Genda Chen

INSPIRE-UTC Annual Meetings

In this study, a fiber optic sensing system based on long period fiber gratings (LPFG) in LP06 and LP07 modes is designed, fabricated and tested for simultaneous measurements of strain, temperature and corrosion-induced mass loss. It consists of three steel tubes and several Fe-C coated LPFG sensors for long- and short-term corrosion monitoring, respectively, when deployed in proximity and parallel to a steel member. Graphene/silver nanowire (Gr/AgNW) composite was coated on the LPFG surface for efficient Fe-C electroplating due to its high optical transparency and conductivity. The sensor was subjected to both tensile strain and temperature, and submerged ...


Modeling Hose Dynamics For Unmanned Aerial Vehicles, Blake Hament, Paul Y. Oh, Autonomous Systems Lab (DASL) 2018 University of Nevada, Las Vegas

Modeling Hose Dynamics For Unmanned Aerial Vehicles, Blake Hament, Paul Y. Oh, Autonomous Systems Lab (Dasl)

INSPIRE-UTC Annual Meetings

Bridges and other large pieces of infrastructure accumulate massive amounts of dirt, dust, and other particulates that can obscure the structure when scanning to discern structural integrity. Traditionally, these particulates have been removed by humans operating handheld compressed-air hoses, often while mounting ladders -- a risky and inefficient task. To improve infrastructure scanning, unmanned aerial vehicles (UAV) equipped with hoses could be used to clean the structure in place of the current method.

The challenge in equipping a UAV with a hose is compensating for the reaction forces and torques produced by fluids expelled by the hose. In order to counteract ...


Parallel Manipulator-Gripper For Mobile Manipulating Uavs, Dongbin Kim, Paul Y. Oh, Autonomous Systems Lab (DASL) 2018 University of Nevada, Las Vegas

Parallel Manipulator-Gripper For Mobile Manipulating Uavs, Dongbin Kim, Paul Y. Oh, Autonomous Systems Lab (Dasl)

INSPIRE-UTC Annual Meetings

Unmanned Aerial Vehicles (UAVs) are originally developed for military, but have been developed over time to time for valuable roles in surveillance, work-assistant, and intelligence for both civilian and military operations.

The ability of UAVs that manipulate or carry objects can expand the type of tasks achieved by unmanned aerial systems. High degree of freedom robots with dexterous arm can lead to various applications. Most of manipulators are serial, each motor on each joint affects on stabilizing UAVs. Our lab , DASL , has presented parallel mechanism manipulator for UAVs. It results in less impact on center of gravity(CoG) of UAVs ...


Uav-Enabled Measurement On Magnetic Field Of Smart Rocks For Bridge Scour Monitoring, Haibin Zhang, Zhaochao Li, Genda Chen 2018 Missouri University of Science and Technology

Uav-Enabled Measurement On Magnetic Field Of Smart Rocks For Bridge Scour Monitoring, Haibin Zhang, Zhaochao Li, Genda Chen

INSPIRE-UTC Annual Meetings

Scour and other hydraulic induced failures accounted for 58% of over 1,500 bridge collapses in the U.S. Bridge scour is the engineering term for the erosion of soil surrounding a bridge foundation as a result of water current. Monitoring with fixed and/or portable instrumentations is one of the most effective measures in mitigating scour hazards. However, fixed instrumentation with sensors installed prior to flood events cannot detect scour other than the area instrumented. It is susceptible to the harsh environment during a flood event. Portable instrumentation is difficult to deploy during a severe flood event due to ...


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