偏心構造物のパルス応答解析 : 一軸偏心の場合のパラメトリック応答解析(II)

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In order to make clear the PULSE RESPONSE BEHAVIOURS of asymmetric building structures, a parametric response study on lateral-torsional responses of inelastic single-story mono-eccentric building structures has been performed by using MODE-SEPARATING PULSE RE-SPONSE ANALYSIS METHOD proposed in the previous paper presented by the authors. In this paper, the single-story mono-eccentric building structures are idealized as a system consisting of a rigid deck suported by 4 frame and/or wall assemblages situated at the periphery which are assumed to have force-displacement characteristics represented by a bi-linear model. An unidirectional excitation is considered in the response analysis. In this research, the system parameters and their numerical ranges are : (1) eccentricity ratio (0.0-1.0) (2) aspect ratio (1.0-10.0) (3) initial elastic period (0.1-10.0 sec) (4) initial base coefficient (0.1-1.0) Then, the effects of the system parameters on the lateral-torsional response have been examined through the parametric response study. The results show very interesting conclusions among which the followings are important for an earthquake-resistant design of building structures with the eccentricity in strength as well as stiffness. 1) The lateral displacement of the center of mass does not vary with changing the eccentricity ratio at al^ for the system having small aspect ratio, but increases largely with increasing the eccentricity ratio for the system having large aspect ratio. 2) The torsional displacement of the system increases almost linearly with increasingthe eccentricity ratio for the system having small aspect ratio, but not linearly for the system having large aspect ratio. 3) The maximum displacement of element located on the weak stiff edge in the eccentric direcition increases with increasing in eccentricity within the almost entire period domain. 4) The system shows some what constant in the total deformation energy despite of changing eccentricity and aspect ratio in an asymmetric building structure. But, the deformation energy distributed to every resisting element in the X or y direction varies largely wiht changing the eccentricity ratio. 5) The effects of the eccetricity ratio on the responses may be divided into 3 regions: (1) small eccentricity ratio: 0.0-0.2 (2) medium eccentricity ratio: 0.2-0.5 (3) large eccentricity ratio: 0.5-1.0 6) The increse of the maximum displacements trends toward unchanging despite of increasing the aspect ratio when the aspect ratio is larger than 3.0 -4.0.
社団法人日本建築学会の論文
1990-11-30

偏心構造物のパルス応答解析 : 一軸偏心の場合のパラメトリック応答解析(II)

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