Seismic retrofit of spread footings supporting bridge columns with short dowels

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• 作者：Saiidi ; M. Saiid ; Sanders ; David ; Acharya ; Suresh
• 关键词：Concrete ; Footings ; Retrofit ; Bridge
• 刊名：Construction and Building Materials
• 出版年：2001
• 出版时间：June, 2001
• 年：2001
• 卷：15
• 期：4
• 页码：177-185
• 全文大小：1023 K

文摘

A study was undertaken to develop and test a seismic retrofit method for bridge spread footings. Two 0.4-scale footing specimens representing the as-built and retrofitted footings were tested under cyclic lateral loads. The soil flexibility was simulated by elastomeric bearing pads. The test of the as-built specimen showed that the footing failed before the column flexural capacity could be reached. The retrofit included the enlargement of the plan view dimensions and the thickness, addition of top steel, and placement of dowels to connect the existing and new concrete. The column to footing connection was retrofitted with a steel jacket connected to the footing by bolts. The experimental and analytical results indicated that the retrofit reduced footing damage to a negligible level while it increased the flexural strength and deformation capacity of the footing.