溶接部が構造物の動特性に与える影響 : 加振実験に基づく振動特性および信頼性の検討

抄録

Welding is widely used for construction of structures. This paper deals with effects of welding on response characteristics and reliability of structures. First, the damping ratio and natural frequency of welded specimen are estimated by experiment. Second, by using obtained results, response characteristics of a mechanical model which is used to simulate a specimen subjected to stationary random excitations are examined. Third, the effect of welding on reliability is examined by estimation of first excursion probability. It is concluded that the effect of welding appears as an increase in the damping ratio and as a decrease in response and failure probability. It is also concluded that the effect of welding on natural frequency is very small. Finally, the applicability of obtained results to actual structures is examined by experiment. In this experiment, the damping ratio increases when welding is used.