【摘要】：為了從隨機振動的角度研究地震動空間變化對曲線梁橋抗震性能的影響,以一座4跨混凝土連續(xù)梁橋為例,考慮了不同視波速、不同相干性以及不同場地條件對結(jié)構(gòu)地震響應(yīng)的影響,采用虛擬激勵法對曲線梁橋在多維多點地震作用下的抗震性能進行了隨機振動分析。結(jié)果表明:地震動的空間變化性會對曲線梁橋的地震響應(yīng)產(chǎn)生顯著影響;與一致激勵相比較,結(jié)構(gòu)在空間變化地震作用下的地震響應(yīng)增大了2%~55%。其中場地效應(yīng)對結(jié)構(gòu)響應(yīng)的影響最大。因此,在抗震設(shè)計中應(yīng)充分考慮地震動的空間變化,以免低估結(jié)構(gòu)的地震響應(yīng)。
[Abstract]:In order to study the effect of spatial variation of ground motion on seismic behavior of curved beam bridge from the angle of random vibration, a 4-span concrete continuous beam bridge is taken as an example, and different apparent wave velocities are considered. Based on the effect of different coherence and site conditions on the seismic response of the structure, the random vibration analysis of curved beam bridges under multi-dimensional and multi-point earthquakes is carried out by using the virtual excitation method. The results show that the spatial variation of ground motion has a significant effect on the seismic response of curved girder bridges, and the seismic response of the structure under the action of spatially varying earthquake increases by 2 / 555 in comparison with the uniform excitation. The site effect has the greatest influence on the structure response. Therefore, the spatial variation of ground motion should be fully considered in seismic design so as to avoid underestimating the seismic response of the structure.
【作者單位】： 北京工業(yè)大學(xué)工程抗震與結(jié)構(gòu)診治北京市重點實驗室;
【分類號】：U441.3

【參考文獻】

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1 王前信;伍國，

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