A model is presented for pushover analysis of reinforced concrete soft-rst-story frames with columns extended toward inside of frames. The model includes a rotational spring of rst-story column and that of beam. The beam spring represents the exural resistance of the section which includes the beam and the second-story column. The yield deformation of each spring is determined based on the observed strain distribution of the longitudinal bars. The proposed model agreed with the test results much better than the conventional model, which provided up to twice of the observed strength and a half of the observed yield deformation.
A previous paper by our group has presented a model for RC soft-rst-story frames with columns extended toward inside and subjected to opening load. In this paper, a model for closing load is developed with a similar method of the previous paper. The model includes a rotational spring of column and that of beam. The beam spring represents the exural resistance of the beam, the second-story column, the wall panel and the beam stirrups. The yield deformation of each spring is determined based on the observed strain distribution. The proposed model agreed with the test results much better than the conventional model.
Previous papers by our group have presented a model for RC soft-rst-story frames with columns extended toward inside. In this paper, a model for frames with columns extended toward outside is developed with a similar method of the previous papers. The model includes a rotational spring of rst-story column and that of beam. The beam spring represents the exural resistance of the beam and the second-story column. The proposed model agreed with the test results much better than the conventional model, which provided the higher strengths than the observed values and a half of the observed yield deformations.
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