105 resultados para Corticocortical Connection Patterns
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The Iowa Department of Transportation has long recognized that approach slab pavements of integral abutment bridges are prone to settlement and cracking, which manifests as the “bump at the end of the bridge”. A commonly recommended solution is to integrally attach the approach slab to the bridge abutment. Two different approach slabs, one being precast concrete and the other being cast-inplace concrete, were integrally connected to side-by-side bridges and investigated. The primary objective of this investigation was to evaluate the approach slab performance and the impacts the approach slabs have on the bridge. To satisfy the research needs, the project scope involved a literature review, survey of Midwest Department of Transportation current practices, implementing a health monitoring system on the bridge and approach slab, interpreting the data obtained during the evaluation, and conducting periodic visual inspections. Based on the information obtained from the testing the following general conclusions were made: The integral connection between the approach slabs and the bridges appear to function well with no observed distress at this location and no relative longitudinal movement measured between the two components; Tying the approach slab to the bridge appears to impact the bridge; The two different approach slabs, the longer precast slab and the shorter cast-in-place slab, appear to impact the bridge differently; The measured strains in the approach slabs indicate a force exists at the expansion joint and should be taken into consideration when designing both the approach slab and the bridge; The observed responses generally followed an annual cyclic and/or short term cyclic pattern over time.
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A monthly newsletter for Iowa Commission on the Status of Women; Early On-Set of Puberty: More Important Than You Think
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A monthly newsletter for Iowa Commission on the Status of Women; Early On-Set of Puberty: More Important Than You Think
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A Newsletter from the Iowa Office of Consumer Affairs
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A Newsletter from the Iowa Office of Consumer Affairs
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The Connection is to educate parents, family members, community leaders and teachers about the most current trend in drug abuse and emerging threats we face in Iowa.
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The Connection is to educate parents, family members, community leaders and teachers about the most current trend in drug abuse and emerging threats we face in Iowa.
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The Connection is to educate parents, family members, community leaders and teachers about the most current trend in drug abuse and emerging threats we face in Iowa.
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The Connection is to educate parents, family members, community leaders and teachers about the most current trend in drug abuse and emerging threats we face in Iowa.
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The Connection is to educate parents, family members, community leaders and teachers about the most current trend in drug abuse and emerging threats we face in Iowa.
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The Connection is to educate parents, family members, community leaders and teachers about the most current trend in drug abuse and emerging threats we face in Iowa.
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The Connection is to educate parents, family members, community leaders and teachers about the most current trend in drug abuse and emerging threats we face in Iowa.
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The Connection is to educate parents, family members, community leaders and teachers about the most current trend in drug abuse and emerging threats we face in Iowa.
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The Girl Connection newsletter was published from 2000 to 2011.
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With an ever increasing desire to utilize accelerated bridge construction (ABC) techniques, it is becoming critical that bridge designers and contractors have confidence in typical details. The Keg Creek Bridge on US 6 in Iowa was a recent ABC example that utilized connection details that had been utilized elsewhere. The connection details used between the drilled shaft and pier column and between the pier column and the pier cap were details needing evaluation. These connection details utilized grouted couplers that have been tested by others with mixed results—some indicating quality performance and others indicating questionable performance. There was a need to test these couplers to gain an understanding of their performance in likely Iowa details and to understand how their performance might be impacted by different construction processes. The objective of the work was to perform laboratory testing and evaluation of the grouted coupler connection details utilized on precast concrete elements for the Keg Creek Bridge. The Bridge Engineering Center (BEC), with the assistance of the Iowa Department of Transportation (DOT) Office of Bridges and Structures, developed specimens representative of the Keg Creek Bridge connections for testing under static and fatigue loads in the structures laboratory. The specimens were also evaluated for their ability to resist the intrusion of water and chlorides. Evaluation of their performance was made through comparisons with design assumptions and previous research, as well as the physical performance of the coupled connections.