Analysis of the passive earth pressure on a gravity-type anchorage for a suspension bridge
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Analysis of the passive earth pressure on a gravity‑type anchorage for a suspension bridge Hyunsung Lim1, Seunghwan Seo1, Sungjune Lee2 and Moonkyung Chung1*
*Correspondence: [email protected] 1 Korea Institute of Civil Engineering and Building Technology, 283 Goyang‑daero, Ilsanseo‑gu, Goyang‑Si, Gyeonggi‑do 10223, Republic of Korea Full list of author information is available at the end of the article
Abstract In this study, numerical analyses have been performed for a reasonable gravity-type anchorage design. The emphasis is on evaluating the effect of the passive earth pressure for gravity-type anchorages under pullout loading. Three-dimensional FE analyses were performed for different types of bedrock and embedded depths. Based on this study, it is found that the displacement of the gravity-type anchorage decreased with increasing embedded depth due to the increase in the passive resistance in front of the anchorage. It is also found that the resistance due to passive earth pressure in front of the anchorage accounts for approximately 10–30% of the total resistance and thus represents a significant improvement in the prediction of the realistic resistance for gravity-type anchorages subjected to pullout loads. Keywords: Suspension bridge, Gravity-type anchorage, Finite element analysis, Passive earth pressure, Embedded depth
Introduction Suspension bridges are widely used as a type of bridge structure across long spans because they have significant advantages in their material properties and significant height-span ratios of the stiffening girders [2, 5]. An anchorage is a key structural component that is capable of withstanding the tension force due to the main cable in suspension bridge design [8]. Typical anchorage types are divided into two categories: tunnel-type and gravity-type anchorages. In most cases, a gravity-type anchorage, in which the horizontal loads from the main cables are resisted principally by friction between the underside of the foundation and the supporting strata, is widely used because it is less affected by soil conditions and has a well-known support mechanism. The passive resistance in front of the anchorage occurs, but it is ignored for conservative design and it has not been established yet. Therefore, it is necessary to analyze the effect of passive resistance in front of anchorage for reasonable design. The objective of this study was to investigate the passive earth pressure in front of gravity-type anchorages by using 3D FE analyses. The effect of the passive earth pressure was investigated by changing the embedding depth and bearing layer. Additionally, © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other
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