框架—剪力墻層間隔震結(jié)構(gòu)隨機(jī)響應(yīng)與動(dòng)力可靠度研究
本文選題:框架-剪力墻層間隔震結(jié)構(gòu) + Bouc-Wen模型; 參考:《廣州大學(xué)》2017年碩士論文
【摘要】:層間隔震結(jié)構(gòu)是指將隔震層設(shè)置在基礎(chǔ)之上的某一層柱頂與樓面之間,是在基礎(chǔ)隔震結(jié)構(gòu)的工程實(shí)踐中發(fā)展起來的一種新型隔震形式。另外,地震是一種災(zāi)害性的自然現(xiàn)象,具有很強(qiáng)的隨機(jī)性,因此利用隨機(jī)動(dòng)力可靠度理論與研究成果對(duì)框架-剪力墻層間隔震結(jié)構(gòu)進(jìn)行隨機(jī)響應(yīng)分析不僅可以更加真實(shí)的反映地震的不確定性,而且利用隨機(jī)響應(yīng)結(jié)果可以進(jìn)一步分析結(jié)構(gòu)的動(dòng)力可靠度,從而又可以利用動(dòng)力可靠度來判別結(jié)構(gòu)的主要失效模式,以確定決定結(jié)構(gòu)安全度的主控因素。本文根據(jù)隨機(jī)振動(dòng)理論,結(jié)合虛擬激勵(lì)法,采用零均值平穩(wěn)的Clough-Penzien雙過濾功率譜模型對(duì)一棟12層(模型1)和一棟10層(模型2)的框架-剪力墻層間隔震結(jié)構(gòu)在小震與大震作用下的隨機(jī)響應(yīng)進(jìn)行了分析,以隔震層和其他各層的最大層間位移響應(yīng)作為控制指標(biāo),建立極限狀態(tài)方程,采用當(dāng)量正態(tài)化法(JC法),通過串聯(lián)模式,然后根據(jù)MATLAB自編程序,進(jìn)而計(jì)算出結(jié)構(gòu)的動(dòng)力可靠度,然后通過動(dòng)力可靠度判別框架-剪力墻層間隔震結(jié)構(gòu)的主控失效模式,為保障框架-剪力墻層間隔震體系的地震安全提供理論基礎(chǔ)。本文的主要內(nèi)容如下:1、框架-剪力墻層間隔震結(jié)構(gòu)動(dòng)力方程的建立。首先探討了框架-剪力墻層間隔震結(jié)構(gòu)非比例阻尼模型的選取和恢復(fù)力模型的選取及其等效線性化,然后將框架-剪力墻層間隔震結(jié)構(gòu)簡(jiǎn)化為多質(zhì)點(diǎn)體系,并假定小震下結(jié)構(gòu)處于彈性狀態(tài),隔震層的恢復(fù)力模型采用等效的線彈性模型;大震下結(jié)構(gòu)處于彈塑性狀態(tài),隔震層的恢復(fù)力采用非退化的Bouc-Wen模型,其他樓層的恢復(fù)力采用退化的Bouc-Wen模型,分別建立小震與大震作用下框架-剪力墻層間隔震結(jié)構(gòu)的動(dòng)力分析方程,最后利用Etabs分析軟件建立了本文的有限元模型,并對(duì)模型進(jìn)行了模態(tài)分析。2、框架-剪力墻層間隔震結(jié)構(gòu)隨機(jī)響應(yīng)分析。首先對(duì)虛擬激勵(lì)法和蒙特卡洛法的基本原理做了簡(jiǎn)要介紹,然后根據(jù)虛擬激勵(lì)法分別建立了小震和大震作用下框架-剪力墻層間隔震結(jié)構(gòu)的隨機(jī)響應(yīng)算法,又結(jié)合模型1和模型2進(jìn)行了隨機(jī)響應(yīng)分析,最后利用Monte Carlo法對(duì)隨機(jī)響應(yīng)計(jì)算結(jié)果進(jìn)行了檢驗(yàn),并與非隔震結(jié)構(gòu)的響應(yīng)進(jìn)行了對(duì)比。3、框架-剪力墻層間隔震結(jié)構(gòu)動(dòng)力可靠度分析。在得到結(jié)構(gòu)各層的層間位移響應(yīng)峰值統(tǒng)計(jì)量的基礎(chǔ)上,建立極限狀態(tài)下的功能狀態(tài)方程,利用當(dāng)量正態(tài)化法,通過串聯(lián)模式,并假定各子結(jié)構(gòu)之間相互獨(dú)立且小震下結(jié)構(gòu)失效互不相關(guān)、大震下結(jié)構(gòu)各部分失效相關(guān),對(duì)模型1和模型2的動(dòng)力可靠度進(jìn)行了研究,然后采用模型1為算例,根據(jù)“小震不壞,中震可修,大震不倒”抗震設(shè)防標(biāo)準(zhǔn),將地震災(zāi)害分為三個(gè)等級(jí),比較了框架-剪力墻層間隔震結(jié)構(gòu)與非隔震結(jié)構(gòu)在50年設(shè)計(jì)基準(zhǔn)期內(nèi)發(fā)生各震害等級(jí)時(shí)結(jié)構(gòu)的整體可靠度。4、粘滯阻尼器層間混合隔震結(jié)構(gòu)隨機(jī)動(dòng)力可靠度研究。為了限制隔震層在大震作用下的位移,提高結(jié)構(gòu)的整體可靠度,提出在隔震層增設(shè)粘滯阻尼器的層間混合隔震體系,通過改變粘滯阻尼器的速度指數(shù)和粘滯阻尼系數(shù),系統(tǒng)的研究了粘滯阻尼器層間混合隔震結(jié)構(gòu)的隨機(jī)動(dòng)力可靠度。5、基于動(dòng)力可靠度框架-剪力墻層間隔震結(jié)構(gòu)的參數(shù)分析;趧(dòng)力可靠度,針對(duì)框架-剪力墻層間隔震體系,對(duì)不同隔震層剛度、不同隔震層位置以及不同場(chǎng)地類別情況下在小震與大震作用時(shí)的減震效果進(jìn)行了探討。
[Abstract]:The interlayer isolation structure is a new type of isolation form which is developed in the engineering practice of base isolation structure. In addition, the earthquake is a natural phenomenon of catastrophic nature and has very strong randomness. Therefore, the theory of random dynamic reliability and the research results are used. The random response analysis of frame shear wall structure can not only reflect the uncertainty of the earthquake more truly, but also make use of the random response results to further analyze the dynamic reliability of the structure, so that the dynamic reliability of the structure can be used to determine the main failure mode of the structure, so as to determine the safety of the structure. Based on the random vibration theory and the virtual excitation method, this paper analyses the random response of a 12 layer (model 1) and a 10 layer (model 2) frame shear wall structure with 12 layers (model 1) and a 10 layer (model 2) under the action of small earthquakes and large earthquakes. The maximum interlayer displacement response is used as the control index, the limit state equation is established, and the equivalent normalization method (JC method) is adopted to calculate the dynamic reliability of the structure through the series mode and then according to the MATLAB self compiled program, and then the main control failure mode of the frame shear wall isolation structure is identified by the dynamic reliability, in order to guarantee the frame shear. The theoretical basis of seismic safety of force wall interlayer isolation system is provided. The main contents of this paper are as follows: 1, the establishment of dynamic equations of frame shear wall interlayer isolation structure. First, the selection of non proportional damping model and the selection of restoring force model and the equivalent linearization of the frame shear wall interlayer isolation structure are discussed, and then the frame shear wall is used. The interlayer isolation structure is simplified as a multi particle system, and it is assumed that the structure is elastic under small earthquakes, the resilient model of the isolation layer adopts the equivalent linear elastic model, the structure is in the elastoplastic state under the large earthquake, the recovery force of the isolation layer adopts the non degenerate Bouc-Wen model, and the restoring force of the other floor is constructed by the degenerated Bouc-Wen model, respectively. Li Xiaozhen and the dynamic analysis equation of the frame shear wall interlayer structure under the action of the large earthquake, and finally use the Etabs analysis software to establish the finite element model of this paper, and carry out the modal analysis of the model.2, the random response analysis of the frame shear wall isolation structure. First, the basic principles of the pseudo excitation method and the Monte Carlo method are made. According to the virtual excitation method, the random response algorithm of the frame shear wall interlayer structure under the action of small earthquake and large earthquake is established, and the random response analysis is carried out with model 1 and model 2. Finally, the results of the random response calculation are tested by Monte Carlo method, and the response to the non isolation structure is carried out. The dynamic reliability analysis of frame shear wall interlayer isolation structure is compared with.3. On the basis of the peak statistics of the interlayer displacement response of each layer, the function state equation is established under the limit state, and the equivalent normalization method is used to pass the series mode, and the structure failure of each sub structure is independent and the structure failure is not related to each other. The dynamic reliability of the model 1 and model 2 is studied under the large earthquake. Then the model 1 is used as an example to divide the earthquake disaster into three grades according to the standard of "small earthquakes not bad, moderate earthquake repairable, large earthquake not falling", and compare the design of frame shear wall isolation structure and non isolation structure in 50 years. In the base period, the overall reliability of the structure is.4, and the random dynamic reliability of the composite isolation structure is studied. In order to limit the displacement of the seismic isolation layer and improve the overall reliability of the structure, a hybrid isolation system with viscous dampers is put forward in the isolation layer, and the viscous resistance is changed by changing the viscosity resistance. The velocity index and viscous damping coefficient of the NEB are studied systematically for the random dynamic reliability.5 of the viscous dampers, based on the parameter analysis of the frame shear wall structure with the dynamic reliability. Based on the dynamic reliability, the stiffness of the different isolation layers and the different isolation are based on the frame shear wall interlayer isolation system. The effect of shock absorption under small earthquake and large earthquake is discussed in the case of location and different site types.
【學(xué)位授予單位】:廣州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TU973.16;TU352.12
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