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原文传递 PREDICTING THE ULTIMATE LOAD CARRYING CAPACITY OF LONG-SPAN PRECAST CONCRETE ARCH CULVERTS

题名：	PREDICTING THE ULTIMATE LOAD CARRYING CAPACITY OF LONG-SPAN PRECAST CONCRETE ARCH CULVERTS
作者：	Manoochehr Zoghi
关键词：	ultimate；predict；long；rete；ecas；span；ncre；reca；cast；apac
摘要：	In a previous full-scale live load test, partially sponsored by the Ohio Department of Transportation, conducted on a 36-fl precast reinforced concrete arch culvert the ultimate load carrying capacity could not be established due to the limited hydraulic jack’s capacity. Furthermore, the earlier analysis was tailored to site-specific conditions. The objectives of this second pha5C of the research project were two fold. First, the failure mode of the test culvert was investigated utilizing a more rigorous analysis based on the modified CANDE finite-element computer program. Second, the soilstructure interaction characteristics of long-span precast concrete arch culverts were analyzed under a wide variety of site conditions using the previous full-scale load test results as a benchmark. Accordingly, a finite-element model of the test bridge was developed using the modified CANDE computer program. Beam-column elements were utilized to model the actual structure, whereas quadrilateral (or triangular) elements were employed in modeling the surrounding soil including the backfill and fill cover, and foundation footings and bedding. The construction process was simulated by first analyzing the structure resting on its foundation with no backfill. Then, a series of soil lifts was added alongside the culvert until the process of backfilling around and over the structure was complete. The vehicular traffic load was replicated in the analysis by applying loads on the surface of the top layer of soil. The preceding analyses revealed that the ultimate load the arch culvert structure can withstand is approximately 340 kips. It was also determined that the high quality of soil compaction is paramount in the overall structural integrity and soil-structure interaction performance.
报告类型：	科技报告