A company which has a production facility has a strong concern for early business recovery after a natural disaster. Though the "Recovery Time Objective" (RTO) is very important to carry out business continuity management, a method to predict restoration time which is necessary to decide RTO has not been established. This paper proposes two simplified methods applying the idea of an event tree analysis for productive facilities. However event tree calculation becomes difficult when the number of events is larger. Commonly used PC programs cannot do the calculation which involves over thirty events. The event tree analysis for over thirty events is able to be calculated by the restoration time evaluation of a series of scenario simplified. This paper shows the derivation of the methods, the calculation accuracy and the validity of the methods. Finally a calculation example to which these proposing methods are applied to an assumption factory is introduced. It is found that recovery time does not become short though the number of restoration staffs is larger because of influence of other factors like approval time and delivery time.

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Steel pipe piles with wings are suitable for construction and environment. However, the wings at the tip of the pile installed to increase the bearing capacity disturb the surrounding ground after the penetration, which affects the frictional force on the peripheral surface of the pile and the coefficient of lateral subgrade reaction. In this study, the hardness of the surrounding ground after penetrating a steel pipe pile with wings made of flat steel plate into the sandy ground rotationally was measured by the cone penetration resistance, and the change in ground hardness before and after the pile penetration was grasped. In addition, it is considered that the steel pipe pile with wings has the effect of compacting the surrounding ground by penetrating the pile body without removing the soil. Therefore, in this study, we attempted to quantify the effect of ground disturbance for piles with wings to change the ground. hardness Moreover, we evaluated the effect of expanding the ground to harden the ground using the cavity expansion theory.

The loss of foundation characteristics is very important to predict the structure born sound in rooms. The level of the structure born sound is often evaluated in the plan stage of the building project and tends it to be demanded evaluation in a short time. A method of Yamahara that foundation is assumed to be no mass and to be rigid surface foundation is generally used in the evaluation of input loss of foundation.However, it is difficult to use the method of Yamahara as for the cases that long and thin foundations which in itself cannot consider to be rigid in comparison with the hardness of the neighboring ground. From the above a simplified evaluation method of soft foundations using an advantage of Yamahara's method is suggested. In addition, measurements of the input loss of foundation of three buildings excited by the railroad vibration were carried out and this method is applied to these measurement results and is confirmed the validity.

However, the ratio of the friction energy to the input energy is roughly constant for the seismic motions of which maximum velocity is 0.3 ~ 0.5m/s.