原文传递 Base Connections for Signal/Sign Structures.
题名: Base Connections for Signal/Sign Structures.
关键词: connection;structure;signal;base;alternative;transferrin;representation;annular;literature;components
摘要: The Atlantic hurricane season of 2004 brought with it a series of four major hurricanes that made landfill across Florida within a six-week period. During this time, a number of cantilever sign structures along the state interstate system failed. As a result, the Florida Department of Transportation (FDOT) began a series of research initiatives to address this issue. The first research project determined the cause of the failures, the proper design procedure, and a retrofit option. A second suggested a load transfer system to eliminate anchor bolts from the foundation design. The current project suggests a way to also eliminate annular plates from the design of the base connection. The alternative chosen for testing after a literature review was the tapered bolted slip base design. This alternative consists of two main components: a slip joint and through bolts. The slip joint is designed to transfer flexural loads while the through-bolts are responsible for transferring torsional loads from the upper pole to the lower pole. The selection of this alternative as a replacement for the anchor bolt and annular plate option has the potential to improve the AASHTO fatigue rating from an E or E' up to a B. The results of the test program give a detailed representation of the behavior of the base connection components. The data and observations during the after testing reveal how the load is transferred along the length of the slip joint and across the through-bolts. The tapered bolted slip base connection has been proven adequate for transferring both flexural and torsional loads as applied to a cantilever signal or sign structure.
报告类型: 科技报告
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