PROPOSAL OF A METHOD FOR SEISMIC BEARING CAPACITY VERIFICATION OF SMALL CAISSON FOUNDATION

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  • 小断面ケーソン基礎の地震時底面支持力照査手法の提案

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<p> Recently, caisson foundations have been increasingly used as bridge foundations in narrow areas, etc., as improvements in construction technology have made it possible to deepen the rooting in small sections. In this study, horizontal loading tests were carried out in aluminium bar laminates using a caisson foundation model with the parameters of rooting ratio and dead load safety factor (ratio of ultimate bearing capacity to vertical dead load), focusing on the cumulative behaviour and mechanical properties of caisson foundations with rooting after an earthquake. The results showed that the ultimate bearing capacity at the bottom of the caisson foundation with rooting was over-estimated in relation to the maximum ground reaction force at the bottom of the caisson foundation measured during the experiments, which may lead to residual displacement. This paper proposes a method for calculating the limit bearing capacity of the caisson foundation bottom taking into account the dead load safety factor and rooting ratio, as well as the limit values of the foundation bottom reaction moment to avoid the occurrence of harmful residual settlement.</p>

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