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International Concrete Abstracts Portal

Showing 1-5 of 15 Abstracts search results

Document: 

SP340

Date: 

April 30, 2020

Author(s):

Andrzej S. Nowak, Hani Nassif, Victor Aguilar

Publication:

Symposium Papers

Volume:

340

Abstract:

Professor Dennis Mertz passed away after a prolonged battle with cancer. He spent a large portion of his professional career working on advancing of the state-of-the-art of bridge engineering. He was a great friend and colleague to many at ACI and ASCE. Joint ACI-ASCE Committee 343, joined with ACI Committees 342 and 348, sponsored four sessions to honor his contributions and achievements in concrete bridge design and evaluation. These sessions highlighted the important work and collaborative efforts that Dr. Mertz had with others at ACI and ASCE on various topics. These sessions also combined the efforts among ACI and ASCE researchers and practitioners in addressing various topics related to the design and evaluation of concrete bridges. The scope and outcome of the sessions are relevant to ACI’s mission. They raise awareness on established design methodologies applied for various limit states covering topics related flexure, shear, fatigue, torsion, etc. They address problems related to emerging design and evaluation approaches and recent development in design practices, code standards, and related applications. The Symposium Publication (SP) is expected to be an important reference in relation to design philosophies and evaluation methods of new and existing concrete bridges and structures.

DOI:

10.14359/51725848


Document: 

SP-340-04

Date: 

April 1, 2020

Author(s):

Michael J. Chajes, Harry W. Shenton III, Hadi T. Al-Khateeb, and Christos Aloupis

Publication:

Symposium Papers

Volume:

340

Abstract:

The maintenance and management of segmental-concrete cable-stayed bridges represents a major investment of human and financial capital. One possible approach to reducing this cost while simultaneously improving the process, is by using structural health monitoring (SHM) systems. The Delaware Department of Transportation (DelDOT), working collaboratively with the University of Delaware (UD) Center for Innovative Bridge Engineering, installed a comprehensive SHM system on the 1,749 ft (533 m) long Indian River Inlet Bridge (IRIB) during construction. The SHM system is fiber-optic based with more than 120 sensors of varying type distributed throughout the bridge. Within the first year of service, a series of three controlled diagnostic load tests were conducted utilizing the installed SHM system. The test results have been used to establish a standard set of truck passes for future tests, and the recorded response has been used to establish a baseline against which future test results can be compared. These comparisons will yield a quantitative measure of how the bridge is performing, and in combination with the more qualitative biennial inspections, will enable DelDOT to better manage this critical infrastructure asset.

DOI:

10.14359/51725806


Document: 

SP-340-01

Date: 

April 1, 2020

Author(s):

John M. Kulicki and Gregg A. Freeby

Publication:

Symposium Papers

Volume:

340

Abstract:

Dr. Dennis Mertz was involved with the AASHTO LRFD Bridge Design Specifications [1] for 30 years. Starting with the original development of the specifications and continuing with maintenance and related course development and presentations. His last major contribution to the Specifications was to serve as Principal Investigator for the reorganization of Section 5, Concrete Structures. This presentation summarizes the changes to the structure of the Section including the increased emphasis on design of “B” and “D” regions of flexural members and introduces new and expanded material on beam ledges and inverted T-caps, shear and torsion, anchors, strut and tie modeling and durability. The product of this work was included in the 8th Edition of the Specifications as a complete replacement of Section 5.

DOI:

10.14359/51725803


Document: 

SP-340-03

Date: 

April 1, 2020

Author(s):

Dan Su and Hani Nassif

Publication:

Symposium Papers

Volume:

340

Abstract:

Service I limit state in the AASHTO LRFD Bridge Design Specifications (BDS) is applied for the control of cracking in reinforced concrete elements in order to maintain its normal functionality and to achieve its design life. There are two methods specified in AASHTO LRFD BDS: 1) equivalent strip design method and 2) empirical method. For the empirical method, no exhaustive design calculation are needed and the reinforcement area is obtained as a percentage of the concrete section. However, usually, the reinforcement area designed using empirical method is less than that designed using the equivalent strip method, which could result in shortened service life and excessive crack width. Albeit arching action effects were considered in the empirical method which improves the flexural resistance of concrete deck after cracking, the effects of arching action on crack control of reinforced concrete deck were not studied. In addition, different exposure conditions and different design sections (positive moment vs. negative moment regions) were not considered in the empirical design method. Thus, it is extremely important to investigate and calibrate the Service I limit State for reinforced concrete decks designed using the AASHTO empirical method. In this study, the Service I limit state function is formulated and the load and resistance models are developed. The arching action effects are integrated into the resistance model. Detailed calibration is performed to ensure uniform target reliability will be achieved for different design parameters including exposure conditions, span lengths, deck thickness, and positive moment and negative moment regions.

DOI:

10.14359/51725805


Document: 

SP-340-09

Date: 

April 1, 2020

Author(s):

Steven L. Stroh

Publication:

Symposium Papers

Volume:

340

Abstract:

This paper provides a description and design developments of the extradosed prestressed bridge concept. The development of the extradosed prestressed bridge concept is discussed, drawing upon the differences with a cable-stayed bridge type. Proportioning parameters used for initial concept development or verification are provided. This includes recommendations on span ranges, structure depth, tower height and multi-span applicability. Stay cable design considerations are discussed. These proportioning parameters are applied to a prototype design, the Pearl Harbor Memorial Bridge. Aesthetic opportunities for this new bridge type are discussed.

DOI:

10.14359/51725811


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