SIMPLIFIED DYNAMIC ANALYSIS TO HIGH-RISE STRUCTURE WITH LOCAL DAMEGES

(1)研究了神户地震对Ashiyahama住宅楼的破坏，得到了以下结论：1)重柱在大的轴力和弯矩作用下，第一层发生轴向破坏；由于塑性铰的位置与实际破坏密切相关，有必要避免集中在塑性铰的分布上。ii)地震波在震源附近，由于能量的快速变化，对结构造成了重大的破坏。(3)Ashiyahama住宅楼的柱和支撑的破坏是由于柱与柱的连接产生的集中应力所致。(2)本文提出的延伸杆理论的简化分析方法能够较好地表达Ashiyahama住宅楼等巨型结构的动力特性。…中结构与土的动力相互作用问题越多，地震造成的破坏越大。地震波对工程地基的放大作用与公告所给出的Gs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处鼓包屈曲现象。鼓包屈曲与单元总应变能的快速变化密切相关，这种变化是由阶梯变厚度引起的。由数值计算确定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。在同一地震波作用下，均匀圆柱壳也发生了类似的鼓包屈曲，但发生在底部附近而不是中间高度。从延伸杆理论出发，给出了控制中高度鼓起屈曲现象的简化理论。(4)考虑了在浅层强震震源区附近经常观察到的巨石上倾现象，考虑了在地下深处发射的波，这些波通过地面和巨石传播，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响应发生共振，因此发生了巨石的上抛。因此，可以从巨石的上抛来估计地震的强度。较少

(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