【摘要】 石家庄国际会展中心中央大厅东西向沿轴线长约800m,属超长结构。采用大质量法对其进行了地震作用的多向、多点、多维输入分析研究,主要考察行波效应对整体结构反应的影响,以及对地上钢结构树形柱和Y形柱、框架柱与折板网架间的撑杆以及折板网架间的空间倒三角联系桁架杆件内力的影响。分析结果表明,地震动多点输入明显降低了地上整体钢结构的基底剪力反应,增大了各段钢结构的扭转反应。除折板网架外,地上钢结构的轴力及剪力平均超载比为1.2,弯矩的平均超载比为1.1～1.2。1段联系桁架的轴力、Y向弯矩和Y向剪力以及3段框架柱与网架间撑杆的双向剪力的平均超载比为1.3～1.4。更多还原

【Abstract】 Shijiazhuang International Convention and Exhibition Center has a super length of 800 meters along the west-east axis.By the big mass method,investigations have been made on effects of multi-direction,multi-support and three-dimension seismic excitations(MSSE) on the seismic response of the whole structure as well as on the internal forces of the tree or Y shaped columns of the up-ground steel structures,bracing elements between frame columns and folded plate space truss(FPST),the space inverse triangle linking trusses between FPSTs.The results show that the consideration of MSSE apparently reduces the base-shear response of the up-ground steel structure and increases the torsion displacements of its three parts.Statistics from analysis results revealed an average 10%～20% increase effect of MSSE on the internal forces of all members of up-ground steel structure excluding the roof spatial grid structure.It should be noted that the axial force,moment and shear force in Y direction of members of link trusses in Part 1 as well as the biaxial shear forces of brace elements between columns and the roof truss have an increase of 30%～40% effect of MSSE.更多还原