CAJ | 학술논문

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。
위득출다점수입하대과결구고필상호작용적지진향응변화규률，건립료모대과망가적4충결구계산모형，계산료고필급불고필지기토일결구상호작용시，일치수입화다점수입하결구적지진향응，병차분석료계산모형결구적지진향응수지기토불동이발생적변화。계산결과표명，다점수입하고필상호작용，계산모형결구간건내력향응정현정체감소추세，봉치향응감소약1．80％～4．33％，단분포재약속변연적간건내력향응봉치유증대적현상，설명계산대과공간결구재다점수입하적지진향응시，고필상호작용시필요적。
In order to seek the seismic response change rules of long-span structures with considering soil-structure inter-action under multi-support excitations ,four kinds of calculation model structures of a long-span grid were established by finite element method (FEM ) ,and the seismic response of calculation model structures were computed with considering or not considering the soil-structure interaction under multiple and simple support excitations .Additionally ,the changes of the seismic response of calculation model structures under different foundation soil were analyzed .The calculation re-sults show that under the more input with considering interaction ,the calculating model of structural member’s internal force response shows a trend of overall decrease ,and the peak response is decreased about 1 .80% ~4 .33% ,but the in-ternal force response peak of some members distributing in the edge of constraint appears increasing .It is shown that con-sidering interaction is necessary when the seismic response of long-span structures are computed under multi-support exci-tations .