本文選題：界面單元　切入點(diǎn)：實(shí)殼耦合　出處：《中國地震局工程力學(xué)研究所》2017年碩士論文

【摘要】：子結(jié)構(gòu)混合試驗(yàn)方法是抗震試驗(yàn)方法中的一項(xiàng)熱門研究內(nèi)容。該方法將結(jié)構(gòu)中行為復(fù)雜的部分作為試驗(yàn)子結(jié)構(gòu)進(jìn)行試驗(yàn)獲取準(zhǔn)確的恢復(fù)力,其余部分在計算機(jī)中進(jìn)行數(shù)值模擬,獲得慣性力和阻尼力,不僅可以模擬結(jié)構(gòu)在地震動作用下的動力響應(yīng),又能大大降低對加載裝置動力性能的要求,減少了試驗(yàn)成本。子結(jié)構(gòu)混合試驗(yàn)方法的核心問題在于不同子結(jié)構(gòu)之間的邊界協(xié)調(diào),本文利用界面單元方法,對不同自由度耦合問題、支座激勵問題、多點(diǎn)激勵問題進(jìn)行研究。在此基礎(chǔ)上,研究粘彈性人工邊界及地震動輸入問題,以云南牛欄江大橋?yàn)槔M(jìn)行土結(jié)相互作用研究,驗(yàn)證界面單元方法的可行性。本文主要進(jìn)行了以下工作:第一,針對子結(jié)構(gòu)混合試驗(yàn)中不同子結(jié)構(gòu)邊界協(xié)調(diào)問題,提出界面單元方法,并引入靜力凝聚與BFGS方法,實(shí)現(xiàn)多子結(jié)構(gòu)不共節(jié)點(diǎn)的界面協(xié)調(diào),并利用板板模型進(jìn)行驗(yàn)證。第二,研究了實(shí)殼耦合中轉(zhuǎn)換矩陣?yán)碚?將轉(zhuǎn)換矩陣引入界面單元中實(shí)現(xiàn)了具有不同自由度子結(jié)構(gòu)的邊界耦合。建立ABAQUS板-梁模型,驗(yàn)證了該方法的可行性。第三,對界面單元方法進(jìn)行支座激勵分析時產(chǎn)生的問題進(jìn)行研究,解決了界面單元方法支座激勵與非支座激勵之間算法的差別,并利用ABAQUS板梁的板激勵模型進(jìn)行驗(yàn)證。針對考慮行波效應(yīng)的多點(diǎn)激勵問題進(jìn)行簡單模擬,利用界面單元方法實(shí)現(xiàn)多點(diǎn)激勵分析,并與ABAQUS整體分析結(jié)果對比。第四,研究粘彈性人工邊界及其地震動輸入方法,建立不同尺寸參數(shù)的ABAQUS二維、三維土體模型,驗(yàn)證了粘彈性人工邊界地震動輸入方法的準(zhǔn)確性。第五,采用ABAQUS建立了牛欄江大橋橋體模型,利用粘彈性人工邊界的方法,建立考慮土結(jié)相互作用的ABAQUS土-橋模型,實(shí)現(xiàn)土體邊界的地震動輸入。
[Abstract]:The substructure mixed test method is one of the hot research contents in the seismic test method.In this method, the complex part of the structure is used as the test substructure to obtain the accurate restoring force, and the rest is numerically simulated in the computer to obtain the inertia force and damping force.It can not only simulate the dynamic response of the structure under ground motion, but also greatly reduce the requirements for the dynamic performance of the loading device and reduce the test cost.The key problem of the substructure hybrid test method is the boundary coordination between different substructures. In this paper, the coupling problem of different degrees of freedom, the support excitation problem and the multi-point excitation problem are studied by using the interface element method.On this basis, the viscoelastic artificial boundary and the input of ground motion are studied. The interaction of soil junction is studied by taking Niulianjiang Bridge in Yunnan Province as an example, and the feasibility of the interface element method is verified.The main work of this paper is as follows: first, aiming at the problem of boundary coordination of different substructures in substructure mixing test, an interface element method is proposed, and the static coacervation and BFGS method are introduced to realize the interface coordination of multi-substructure non-common nodes.The plate model is used to verify the model.Secondly, the theory of transition matrix in real shell coupling is studied. The transformation matrix is introduced into the interface element to realize the boundary coupling with different degrees of freedom substructures.The ABAQUS plate-beam model is established, and the feasibility of the method is verified.Thirdly, the problems arising from the support excitation analysis of the interface element method are studied, and the difference between the support excitation algorithm and the non-support excitation algorithm of the interface element method is solved, which is verified by the plate excitation model of the ABAQUS plate beam.The multi-point excitation problem considering traveling wave effect is simply simulated. The interface element method is used to realize the multi-point excitation analysis, and the results are compared with that of ABAQUS.Fourthly, the viscoelastic artificial boundary and its seismic input method are studied, and the ABAQUS two-dimensional and three-dimensional soil mass models with different parameters are established to verify the accuracy of the viscoelastic artificial boundary seismic input method.Fifthly, the bridge body model of Niulanjiang Bridge is established by using ABAQUS, and the ABAQUS soil-bridge model considering the interaction of soil junctions is established by using the viscoelastic artificial boundary method to realize the ground motion input of the soil boundary.
【學(xué)位授予單位】：中國地震局工程力學(xué)研究所
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU317

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