Issues in Evaluating Combined Repeated Loading of Deep Foundationsby John P. Turner, Univ of Wyoming, United States,
Fred H. Kulhawy, Univ of Wyoming, United States,
Abstract: The capacity and load/displacement response of deep foundations subjected to combined modes of repeated loading can be significantly different from the response under single (axial or lateral) modes of repeated loading. Although combined repeated loading is common, no generally accepted design or analysis methods presently are available. This paper identifies the principal factors that control the response of deep foundations to combined modes of repeated loading and summarizes the current state of knowledge of each factor. A conceptual framework based on the structural interaction formula is proposed, and the available data from load tests on driven piles and drilled shafts are examined to assess this framework.
Subject Headings: Repeated loads | Load factors | Load tests | Deep foundations | Load bearing capacity | Axial loads | Lateral loads | Frames
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