正弦加力を受ける基礎の浮上りと地下逸散減衰の関係について : 半無限弾性地盤上の基礎の浮上りを伴う動的挙動に関する研究その1

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The purpose of this analytical study is to predict nonlinear soil-structure interaction induced by a base mat uplift subjected to large seismic inputs. In this paper, a modified procedure of the Time-Lagged Influence Coefficient Method, that was named for a numerical method based on the Green's function and the Duhamel's integral, has been employed. The uplift motions of a base mat subjected to sinusoidal excitation have been computed by this procedure. On the basis of computational results, nonlinear subgrade reactions have been estimated in order to be applied to practical approximate calculations by following two ways. One has afforded effective values of spring constant and viscous damping, which are dependent on the frequency and are applicable to obtain the frequency response of a base mat in uplift. The other has afforded a model composed of spring and dashpot as functions of varying contact area. The results obtained here could be summarized as follows. (1) Effective Values of Spring Constant and Viscous Damping The spring constant has been evaluated from equation (63). The damping factor has been considered to be proportional to frequency, and it can be assumed to be unvarying with uplift. Using the equivalent linearization method here, these effective values are applicable in a case of small uplift. (2) Spring-Dashpot Model The spring constant has been regarded as secant static modulus ^s_θ in Table 1, and the damping coefficient C_θ has been evaluated from equation (61). This model is applicable to approximate computations of a base mat response in the time domain, even if uplift is comparatively large.
社団法人日本建築学会の論文
1986-11-30

正弦加力を受ける基礎の浮上りと地下逸散減衰の関係について : 半無限弾性地盤上の基礎の浮上りを伴う動的挙動に関する研究その1

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正弦加力を受ける基礎の浮上りと地下逸散減衰の関係について : 半無限弾性地盤上の基礎の浮上りを伴う動的挙動に関する研究 その1

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正弦加力を受ける基礎の浮上りと地下逸散減衰の関係について : 半無限弾性地盤上の基礎の浮上りを伴う動的挙動に関する研究その1