SIMPLIFIED DYNAMIC ANALYSIS TO HIGH-RISE STRUCTURE WITH LOCAL DAMEGES

(1)对神户地震对足滨住宅楼的破坏进行了研究，得到以下结果：1)第一层重柱轴向破坏是由于大的轴弯矩引起的。由于塑性铰的位置与实际破坏密切相关，因此有必要避免在塑性铰的分布上集中。(2)地震波在震源附近，能量变化快，对结构破坏大。焊接点的破坏是由能量的快速变化引起的。iii)足滨住宅楼柱与支撑的断裂传播是由于支撑与柱连接时产生集中应力而产生的，而没有扣板。(2)阐明了采用扩展杆理论的简化分析方法能够较好地表达足滨住宅楼等大型结构的动力特性。结构与土态的动力相互作用问题增加了结构在地震作用下的破坏。地震波作用在工程基础上的放大效应与公报给出的加速度效应大致相同。(3)从数值计算的角度讨论了神户地震引起的钢桥墩中高凸起屈曲现象。胀型屈曲与单元总应变能的快速变化密切相关。数值计算得到的屈曲强度是弹塑性屈曲理论强度的1.06倍，是弹性屈曲理论强度的0.18倍。在受到相同地震波的均匀圆柱形壳体中也会发生类似的凸起屈曲，但靠近底部而不是中间高度。从扩展杆理论出发，提出了中高度鼓形屈曲现象的简化理论。(4)在浅层强震震源区附近经常观测到的巨石隆起现象，考虑了波的作用，这些波从地下深处发出，穿过地面和巨石传播，并反射回地面，引起地面和巨石之间的相互作用。由于地面和巨石系统对外部波输入的共振响应，导致了巨石的向上抛掷。因此，地震的震级可以由巨石的隆起来估计。少

(1)The damage of Ashiyahama Residential building due to Kobe Earthquake is studied and the following results is obtained :i)The axial breakage of heavy column at the first storey is occurred by the large axial and bending moment. Since the location of plastic hinges is closely related to actual failure, it is necessary to avoid concentration in the distribution of plastic hinges.ii)Earthquake wave being near source brings significant damage to structure by the rapid variation of energy. The failure at welding point occurs from the rapid variation of energy.iii)The fracture propagating through column and brace of Ashiyahama Residential building is occurred by concentrated stress produced by connecting the brace to column without gusset plate.(2) The simplified analysis used the extended rod theory developed here is clarified to express well the dynamic behavior of mega structure such as Ashiyahama Residential building. The dynamic interaction problem between structure and soil states in … More creases the damage due to earthquake. The amplification of earthquake wave acting on engineering foundation is approximately the same as the effect used Gs given by a bulletin.(3)The phenomenon of bulge buckling at the mid-height of steel bridge piers due to the Kobe Earthquake discussed from the numerical computation. The bulge buckling is closely related to rapid variation in the total strain energy of an element due to step-wise variable thickness. The buckling strength determined from the numerical computation is 1.06 times the theoretical strength for elastic-plastic buckling and 0.18 times for elastic buckling. Similar bulge buckling also occurs in a uniform cylindrical shell subjected to the same earthquake wave, but near the base instead of the mid-height.. The simplified theory governing the phenomenon of bulge buckling at the mid-height is presented from the extended rod theory.(4)The upthrow of boulders frequently observed near the source area of a shallow strong earthquake is examined by considering waves, which emanate deep in the ground, propagate through the ground and boulder, and reflect back to the ground, causing interaction between the ground and the boulder. The upthrow of the boulder takes place due to resonance in the response of the system of the ground and boulder to the external wave input. Thus, the magnitude of earthquake may be estimate from the upthrow of the boulder. Less