【摘要】：以上海嘉閔高架橋?yàn)橐劳?利用Open Sees軟件構(gòu)建有限元分析模型進(jìn)行非線性時(shí)程分析,對兩種不同基礎(chǔ)體系下的規(guī)則連續(xù)梁橋的主梁、墩柱、基礎(chǔ)等的地震響應(yīng)進(jìn)行對比分析,并考慮墩高變化的影響。結(jié)果表明:基礎(chǔ)提離設(shè)計(jì),相較常規(guī)基礎(chǔ)設(shè)計(jì),會顯著降低墩柱的縱、橫向彎矩響應(yīng),改善墩柱的受力性能,縱向降幅為20.4%~32.0%,橫向降幅為2.5%~23.8%;單樁的縱向彎矩響應(yīng)減小,降幅達(dá)16.2%~40.0%;樁基最大拉力受到有效控制�；谛乱�(guī)范體系,評估了墩柱和基礎(chǔ)在E2地震下的抗震性能,結(jié)果表明采用提離式樁基礎(chǔ)的規(guī)則梁橋可有效降低墩柱、基礎(chǔ)的地震需求。在E2地震下,墩柱均處于彈性狀態(tài),單樁配筋率相較常規(guī)基礎(chǔ)體系梁橋可隨墩高增加適當(dāng)降低。
[Abstract]:Based on the Shanghai Jiamin Viaduct, the finite element analysis model is constructed by Open Sees software to carry on the nonlinear time history analysis, and the seismic response of the main beam, pier column and foundation of the regular continuous beam bridge under two different foundation systems is compared and analyzed. The influence of pier height variation is also considered. The results show that compared with the conventional foundation design, the longitudinal and transverse bending moment response of the pier column can be significantly reduced, and the mechanical properties of the pier column will be improved by 20.4% to 32.0% in longitudinal direction and 2.5% to 23.8% in transverse direction, the results show that compared with the conventional foundation design, the longitudinal and transverse bending moment responses of the pier column are significantly reduced and the mechanical properties of the pier column are improved. The longitudinal bending moment response of single pile decreases by 16.2% / 40.0%, and the maximum tensile force of pile foundation is controlled effectively. Based on the new code system, the seismic performance of pier-column and foundation under E _ 2 earthquake is evaluated. The results show that the seismic demand of pier-column and foundation can be effectively reduced by using regular beam bridge with lift-off pile foundation. Under E2 earthquake, the pier and column are in elastic state, and the reinforcement ratio of single pile is lower than that of the conventional foundation system beam bridge with the increase of pier height.
【作者單位】： 上海理工大學(xué)環(huán)境與建筑學(xué)院;同濟(jì)大學(xué)土木工程防災(zāi)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(51408359,51378384)
【分類號】：U442.55

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