密肋复合墙结构-基础-地基共同作用体系振动台试验

Shaking table test study of interaction systems of multi-ribbed wall structure-foundetion-sabsoil

为研究密肋复合墙结构-基础-地基共同作用体系地震响应的基本规律,设计制作了1/15比例模型密肋复合墙结构及模拟地基土箱,于土箱内侧设置边界阻尼材料,底部铺设卵石层,分层填筑黄土进行夯实,将结构模型按埋深要求置入土体,形成结构与地基相互作用体系.分别输入不同峰值单向、双向及3向地震波,测试了地基表面及结构楼层的位移及加速响应,计算比较了各测点的加速度及位移放大系数,对地基与结构的加速度与位移放大效应、地震耦合效应以及相互作用系统地震破坏机制进行了分析.结果表明,地震作用下结构放大效应及耦合效应均与烈度及测点位置高度有关,试验加载后地基破坏较严重,上部结构保持基本完好.因此,考虑地基与结构相互作用及地震耦合作用后,在设计中可对结构地震效应进行适当调整.

To study the physical regulations to the seismic response of interaction systems of the multi-rib-bed composite wall structure,foundation and subsoil,the 1/15scale structure model and subsoil box were designed.By boundary damp material installed in the box and gravel under the box,the interaction systems of structure and subsoil was formed after the model embedded in the soil and the subsoil tamped.After the single dimensional,two dimensional and three dimensional earthquake waves were applied in different peak value,the displacement response and acceleration response on subsoil surface and the structure floors were tested.And the amplification factors about acceleration and displacement in each test station were calculated and contrasted.Then the amplification effects were analyzed about acceleration and displacement of subsoil and the structure,as the coupling effects and the damaged mechanism to the interaction system were also studied.As results,the amplification effect and coupling effect of the structure is related to the intensity of the earthquake and the height of the test location.And the subsoil were destroyed strongly and the structure kept unbroken after the test.Therefore,the seismic effect for structure design can b'e corrected when the interaction and coupling between subsoil and structure are considered.