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首页> 美国政府科技报告 >Design of Continuous Bridges Using Precast, Prestressed Concrete Girders Without End Blocks
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Design of Continuous Bridges Using Precast, Prestressed Concrete Girders Without End Blocks

机译：无端块预制预应力混凝土梁连续梁设计

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The study investigated the feasibility of eliminating endblocks from pretensioned continuous bridge girders. The removal of endblocks is estimated to reduce girder costs by 5 to 10 percent. The girders studied were the Washington State Department of Transportation's 'Series 14'. These girders are characterized by 5 inch thick webs and are prestressed with both harped and straight 1/2 inch diameter grade 270 strands. The research consisted of a field test and a destructive laboratory test. The field test was used to identify a basis for the destructive testing. A 'Series 14' girder with endblocks and two 'Series 60' girders without endblocks were instrumented with strain gages and monitored from the time they were manufactured to the time loads were tested on the bridge. The laboratory test was performed with a balanced cantilever arrangement using two 20-ft long 'Series 14' girders without endblocks. The modified girders performed effectively under the applied loads. Therefore, endblocks may be removed from continuous 'Series 14' girders with normal diaphragms.

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