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張相勇
（北京市建筑設(shè)計研究院，北京 100045）[摘要] 大跨空間結(jié)構(gòu)受到的地震作用是多點多維的，結(jié)構(gòu)受力情況十分復(fù)雜。首先介紹了多點多維輸入地震反應(yīng)分析的基本原理，采用時程分析法對合肥南站大跨空間結(jié)構(gòu)進(jìn)行多點多維輸入下的地震響應(yīng)分析，并與一致輸入下的結(jié)構(gòu)響應(yīng)進(jìn)行了對比，考查了兩種輸入方法下結(jié)構(gòu)扭轉(zhuǎn)效應(yīng)和內(nèi)力變化的特點，并進(jìn)行了對比分析，最后得到結(jié)論：對于大跨結(jié)構(gòu)，多點輸入帶來的影響是比較大的；在不同方向地震輸入下，多點輸入下結(jié)構(gòu)的扭轉(zhuǎn)效應(yīng)和內(nèi)力變化相比一致輸入下的扭轉(zhuǎn)效應(yīng)和內(nèi)力變化，有的增大，有的減??；多點輸入影響較大構(gòu)件一般為邊柱、角柱；且多點輸入的影響隨著樓層的升高而減小。
[關(guān)鍵詞] 多點多維輸入；一致輸入；空間結(jié)構(gòu)；地震響應(yīng)；時程分析法
中圖分類號：TU311.3 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2011) Sl-0216-04Dynamic response of Hefei South Station under the multi-support and multi-dimensional excitation
Zhang Xiangyong
( Beijing Institute of Arclutectural Design, Beijing 100045, China)Abstract: Large-span spatial structure by the earthquake is more multidimensional,and the structure stress is very complicated. The basic principles of seismic response analysis method under multi-support and multi-dimensional excitation were introduced. The dynanuc seisrmc responses of Hefei South Station subjected to multi-support and multi-dimensional excitation as well as to simple-support excitation were thoroughly analyzed based on time lustory analysis method. The characteristics of torsion effect and stress change under these two kinds of earthquake motions were studied and compared. The conclusions show that for large-span spatial structures, the impact of multi-point excitation is relatively large. The seismic input in different directions, the effects of torsion and stress by the multi-support excitation compared to the simple-suppmt excitation reveal some increases and some decreases; side columns and comer columns are generally influenced by multi-suppmt excitation, and the impact of multi-support excitation decreases with the increase of floor.
Keywords: multi-support and multi-dimensional excitation; simple-support excitation; lattice structures; seismic response; time lustory response analysis
