【摘要】 为得出多点输入下大跨结构考虑相互作用的地震响应变化规律,建立了某大跨网架的4种结构计算模型,计算了考虑及不考虑地基土一结构相互作用时,一致输入和多点输入下结构的地震响应,并且分析了计算模型结构的地震响应随地基土不同而发生的变化。计算结果表明,多点输入下考虑相互作用,计算模型结构杆件内力响应呈现整体减小趋势,峰值响应减小约1.80%~4.33%,但分布在约束边缘的杆件内力响应峰值有增大的现象,说明计算大跨空间结构在多点输入下的地震响应时,考虑相互作用是必要的。更多还原

【Abstract】 In order to seek the seismic response change rules of long-span structureswith considering soil-structure interaction undermulti-support excitations, four kinds of calculation model structures of a long-span grid were established by finite elementmethod(FEM), and the seismic response of calculation model structures were computed with considering or not considering the soil-structure interaction undermultiple and simple support excitations.Additionally, the changes of the seismic response of calculation model structures under different foundation soil were analyzed.The calculation results show that under the more inputwith considering interaction, the calculating model of structural member’s internal force response shows a trend ofoverall decrease,and the peak response is decreased about1.80%~ 4.33%,butthe internal force response peakof some members distributing in the edge of constraintappears increasing.Itis shown thatconsidering interaction is necessarywhen the seismic response of long-span structures are computed undermulti-supportexcitations.更多还原