Seismic strength prediction and its application of reinforced concrete retainers based on modified rigid body sliding model

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (17) : 55-61.

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Seismic strength prediction and its application of reinforced concrete retainers based on modified rigid body sliding model

XU Lueqin1, 2，LI Jianzhong2

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Abstract

According to the seismic damage of reinforced concrete retainers subjected to brittle diagonal shear failure, two prospective targets are proposed, i.e. restriction of retainer damage scope and improvement of retainer ductile deformation capacity, and two series of experiments are designed on the retainer. The targets are realized by making the retainer sliding on the surface of the cap beam / stem wall. Based on the test results, applicability of Bozorgzadeh rigid body sliding model is discussed in predicting the strength of the retainers. Analysis reveals that Bozorgzadeh model tends to underestimate the strength of the retainer when the roughness of the concrete contact faces cannot be neglected. The applicability of rigid body sliding model can be greatly widened through introduction of a modification term which represents the cohesion forces existing in the concrete contact faces. Applying the test data from various literatures to testify the modified rigid body sliding model, calculations give accurate predictions. Finally for the retainers subjected to sliding shear failure, an analytical formula is established for predicting their seismic strengths. Error analysis tells that the formula provides accurate and reliable calculations, besides it is simple in form and very convenient for the reinforcement design of the retainer, and is therefore of significant practical value.

Key words

bridge / modified rigid body sliding model / tests / reinforced concrete retainer / seismic strength

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XU Lueqin;;LI Jianzhong. Seismic strength prediction and its application of reinforced concrete retainers based on modified rigid body sliding model[J]. Journal of Vibration and Shock, 2014, 33(17): 55-61