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1)東南大學(xué)土木工程學(xué)院，南京，210096；2)江蘇省交通科學(xué)研究院，南京，210017；3)解放軍理工大學(xué)工程兵工程學(xué)院，南京，210029。
【提要】  為對(duì)潤(rùn)揚(yáng)大橋北錨碇地基基礎(chǔ)進(jìn)行運(yùn)營(yíng)期安全監(jiān)控，針對(duì)其運(yùn)營(yíng)期存在的安全問(wèn)題，建立了三維非線性有限元計(jì)算模型，利用該模型對(duì)北錨碇在荷載作用下的響應(yīng)進(jìn)行了分析。在分析結(jié)果的基礎(chǔ)上確定了北錨碇變形監(jiān)控的重點(diǎn)區(qū)域作為安排測(cè)點(diǎn)的依據(jù)，建立了安全監(jiān)控模型作為北錨地基基礎(chǔ)出現(xiàn)異常的報(bào)警判據(jù)，此外還確定了反演分析的重點(diǎn)力學(xué)參數(shù)等便于對(duì)異常情況出現(xiàn)的成因進(jìn)行分析。研究表明，在監(jiān)控模型中采用二次以下多項(xiàng)式函數(shù)擬合索力與響應(yīng)的關(guān)系進(jìn)行預(yù)測(cè)是可行的。
【關(guān)鍵詞】  潤(rùn)揚(yáng)大橋  安全監(jiān)控  錨碇基礎(chǔ)  有限元
North Anchor Foundation Monitoring of Runyang Suspended Bridge Based on Finite Element Analysis/Zhu Xiaowen1,2, Zhao Qilin1,3(1 Southeast University, Nanjing 210096, China; 2 Jiangsu Academy of Communication, Nanjing 210017,China; 3 PLA University of Science & Technology, Nanjing 210029,China)
Abstract:To monitor the safety of the north anchor foundation of Runyang suspended bridge during the working period, the load process exerted on the foundation is simulated by using nonlinear FEM. The internal stress, deformation of soil and shoring structure are calculated. This method is good in simulating construction process of deep foundation excavation and shoring thereof.The results indicate that it is practical to build monitoring model with fitted function between cable force and response as quadratic polynomial or linear polynomial.
Keywords:Runyang bridge; monitoring; anchorage foundation; FEM
*江蘇省交通廳交通科技項(xiàng)目(2003 02)資助。