本文選題：層狀土層 + 地震波　； 參考：《地震工程與工程振動》2017年05期

【摘要】：為研究自然地質(zhì)環(huán)境條件下非均質(zhì)層狀地基對結(jié)構(gòu)物地震響應(yīng)的影響,本文通過層狀飽和土的剛度矩陣的建立,對不同夾層條件下的地基地震響應(yīng)進(jìn)行了對比研究。研究結(jié)果表明:相較于均質(zhì)土層地基,由于非均質(zhì)地基土層存在的非連續(xù)性界面,非均質(zhì)夾層能明顯影響地基的波動響應(yīng)特征,對地震波有著顯著的選擇性濾波作用,尤其在含軟夾層地基條件下能極大削弱入射波中的高頻成分,而硬夾層則能極大濾除地震波中的低頻成分。在對地基地震響應(yīng)研究的基礎(chǔ)上,通過對單樁和群樁碼頭結(jié)構(gòu)的地震響應(yīng)的數(shù)值模擬,對含夾層地基條件下不同剛度結(jié)構(gòu)地震響應(yīng)特性進(jìn)行了對比研究。對比研究表明:對不同剛度的結(jié)構(gòu)物,由于其固有自振頻率的差異,不同夾層地基對其地震動力響應(yīng)存在顯著不同的影響規(guī)律,由于單樁結(jié)構(gòu)較低的固有頻率,使得其對低頻波更為敏感,其固有振型在含軟夾層地基條件下更容易被激發(fā)引起結(jié)構(gòu)共振,而群樁結(jié)構(gòu)則剛好相反,由于其更高的固有頻率,在軟夾層地基條件下由于高頻波的濾除使得結(jié)構(gòu)的地震動力響應(yīng)顯著降低,而在均質(zhì)或含硬夾層條件下更容易激發(fā)其固有振型。通過對不同夾層地基條件下結(jié)構(gòu)地震動力響應(yīng)規(guī)律的研究,可以看出結(jié)構(gòu)的地震動力響應(yīng)同時受地基夾層條件以及結(jié)構(gòu)自身動力特性的影響,相關(guān)研究結(jié)論可為非均質(zhì)地基條件下的結(jié)構(gòu)地震響應(yīng)研究提供參考。
[Abstract]:In order to study the effect of heterogeneous layered foundation on the seismic response of structure under natural geological environment, the seismic response of different intercalation conditions is studied by establishing the stiffness matrix of layered saturated soil. The results show that, compared with the homogeneous soil foundation, because of the discontinuous interface in the heterogeneous soil layer, the heterogeneous intercalation can obviously affect the response characteristics of the foundation, and it has a remarkable selective filtering effect on the seismic wave. Especially under the condition of soft intercalation, the high frequency component of the incident wave can be greatly weakened, and the low frequency component of the seismic wave can be greatly filtered by the hard interlayer. On the basis of the research on the seismic response of foundation, the seismic response characteristics of different stiffness structures under the condition of sandwich foundation are studied by numerical simulation of the seismic response of single pile and pile group wharf structure. The comparative study shows that for structures with different stiffness, due to the difference of natural vibration frequencies, there are significant differences in the seismic dynamic responses of different sandwich foundations, because of the lower natural frequencies of single pile structures. It makes it more sensitive to low-frequency waves, and its natural mode is more easily excited to cause structural resonance under the condition of soft sandwich foundation, whereas the pile group structure is just the opposite, because of its higher natural frequency, The seismic dynamic response of the structure is significantly reduced due to the filtering of high frequency waves in the soft sandwich foundation, and the natural mode of the structure is more easily excited under the condition of homogeneous or hard intercalation. Through the study of seismic dynamic response of structures under different sandwich foundation conditions, it can be seen that the seismic dynamic responses of structures are affected by the intercalation conditions of foundation and the dynamic characteristics of the structures themselves. The relevant conclusions can be used as a reference for the study of seismic response of structures under heterogeneous ground conditions.
【作者單位】： 廣東海洋大學(xué)海洋工程學(xué)院;河海大學(xué)港口海岸與近海工程學(xué)院;大連理工大學(xué)港口海岸與近海工程國家重點實驗室;
【基金】：廣東海洋大學(xué)創(chuàng)新強(qiáng)校工程科研項目(GDOU2016050258)~~
【分類號】：TU435

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