本文選題：型鋼混凝土 + 框架結構　； 參考：《西安建筑科技大學》2013年博士論文

【摘要】：型鋼混凝土（SRC）組合結構以其剛度大、承載能力高、抗震性能優(yōu)越等優(yōu)點，成為高烈度設防地區(qū)高層、大跨、重載及高聳結構的首選結構形式。鑒于試驗采集到的試驗數(shù)據(jù)普遍存在較大離散性且在數(shù)量上不具備統(tǒng)計意義，現(xiàn)階段采用理論分析和數(shù)值方法相結合對相關科學問題進行探究不失為一種可行的研究手段�？紤]到基于微觀單元的數(shù)值模擬建模過程較為復雜，加之計算成本較高且對計算機硬件有著高標準需求，難以對大型復雜結構非線性力學行為進行有限元數(shù)值分析。借助宏觀單元的有限元數(shù)值模擬在確保計算精度的前提下可實現(xiàn)對計算成本的有效控制，得到了廣大科研工作者的青睞。 為滿足SRC框架結構宏觀力學行為研究的需要，論文基于纖維單元模型理論并結合課題組前期關于型鋼-混凝土間粘結滑移性能試驗研究成果，在纖維層面上通過修正鋼纖維的應變以實現(xiàn)對材料間粘結滑移的數(shù)值體現(xiàn)，使其更為精確地反映構件強非線性力學行為，同時提出了模擬SRC節(jié)點剪切變形的剪切塊模型，并結合現(xiàn)階段最新2D單元理論，從而構建了SRC節(jié)點單元，最終基于OpenSEES軟件平臺建立了SRC框架宏觀有限元計算模型，取得了理想的驗證效果。主要研究內(nèi)容及研究結論有： 1.分別采用宏觀單元和微觀單元對SRC柱抗震性能進行數(shù)值模擬分析，并結合試驗實測數(shù)據(jù)，探討了宏觀單元和微觀單元有限元數(shù)值模擬在單元原理、材料本構、網(wǎng)格劃分、加載控制及模擬結果等方面的優(yōu)缺點，提出了基于宏觀單元的SRC梁-柱構件精細化建模方法，為深入進行SRC梁-柱宏觀有限元理論研究奠定了基礎。 2.本課題組前期的研究成果表明，SRC構件在粘結滑移發(fā)生后，，構件的承載力有較大改變。本文基于纖維單元模型理論，根據(jù)課題組前期提出的型鋼-混凝土粘結滑移本構模型及粘結滑移沿截面高度的變化規(guī)律，提出在纖維層面上通過修正鋼纖維應變的方法以實現(xiàn)對材料間粘結滑移的數(shù)值體現(xiàn)，該方法的意義在于精確的反映SRC構件非線性力學行為。 3.為洞悉SRC節(jié)點內(nèi)部應力的傳遞模式與分布情況，通過輔以微觀有限元模擬以彌補試驗研究無法觀察節(jié)點內(nèi)部應力分布形態(tài)的不足，對SRC平面框架涉及的中節(jié)點、邊節(jié)點、角節(jié)點及屋面中節(jié)點進行剪切變形分析，結果表明節(jié)點內(nèi)部應力主要分布在節(jié)點核心區(qū)型鋼腹板、型鋼翼緣內(nèi)部混凝土斜壓短柱及核心區(qū)外箍筋約束的混凝土斜壓短柱區(qū)域，為建立剪力傳遞公式提供了分析依據(jù)。 4.提出用于模擬SRC節(jié)點剪切變形的剪切塊模型，并結合現(xiàn)階段最新2D節(jié)點單元理論以構建SRC節(jié)點單元。根據(jù)SRC節(jié)點構造特點及內(nèi)部應力傳遞模式與分布情況，認為SRC框架梁-柱節(jié)點剪力應由節(jié)點核心區(qū)型鋼腹板、內(nèi)部斜壓桿及外部斜壓桿三個部分承擔，結合主要建筑材料的非線性本構模型，提出了SRC節(jié)點剪力傳遞公式，同時輔以試驗得到的斜壓桿寬度調(diào)整系數(shù)，最終建立了用于模擬SRC節(jié)點剪切變形的剪切塊模型，隨即利用C++計算機語言將剪切塊模型編譯為計算程序，以供2D節(jié)點單元程序調(diào)用，實現(xiàn)了SRC節(jié)點單元的數(shù)值體現(xiàn)。 5.將纖維單元精細化模擬SRC梁-柱構件的方法與SRC梁-柱節(jié)點單元相結合，基于OpenSEES軟件平臺建立SRC框架宏觀有限元計算模型。試驗結果與模擬結果對比表明，本方法建立的SRC框架模型較好的模擬了SRC框架循環(huán)荷載作用下的力學響應。
[Abstract]:The composite steel concrete (SRC) composite structure has become the first structure of high level, large span, heavy load and high towering structure in high intensity fortification area with its advantages of large stiffness, high bearing capacity and superior seismic performance. In view of the large discreteness and no statistical significance in the experimental data collected by the test, the theory is adopted at the present stage. The combination of analysis and numerical methods is a feasible research method. Considering the complexity of the modeling process of numerical simulation based on the microelement, and the high cost of calculation and high standard of computer hardware, it is difficult to carry out the finite element analysis of the nonlinear mechanical behavior of large complex structures. With the help of the finite element numerical simulation of the macro element, the effective control of the calculation cost can be realized on the premise of ensuring the calculation precision.
In order to meet the needs of macro mechanical behavior research of SRC frame structure, the paper based on the theory of fiber element model and combined with the previous research results of the experimental study on the bond slip behavior between steel and concrete in the project group, and by modifying the strain of steel fiber at the fiber level, the numerical expression of the bond slip between the materials is realized, so that it is more accurate. It reflects the strong nonlinear mechanical behavior of the component. At the same time, the shear block model is proposed to simulate the shear deformation of the SRC node. The SRC node unit is constructed with the latest 2D element theory at the present stage. Finally, the macro finite element calculation model of the SRC frame is established based on the OpenSEES software platform, and the ideal results are obtained. The main research content and the main research content are obtained. The conclusions are as follows:
1. the seismic performance of SRC column is numerically simulated by macro element and microelement, and combined with the experimental data, the advantages and disadvantages of the element principle, material constitutive, mesh division, loading control and simulation results are discussed, and the SRC beam based on macro element is proposed. The detailed modeling method for column members lays a foundation for further research on SRC beam column macro finite element theory.
2. the previous research results of the project group show that the bearing capacity of the component is greatly changed after the bond slip occurs in the SRC component. Based on the theory of fiber element model, this paper proposes the modification of the bond slip constitutive model and the change law of the bond slip along the height of the cross section. The method of steel fiber strain is used to realize the numerical expression of bond slip between materials. The significance of this method is to accurately reflect the nonlinear mechanical behavior of SRC components.
3. in order to understand the transmission mode and distribution of the internal stress in the SRC node, by using the microscopic finite element simulation to make up for the inability to observe the stress distribution in the node, the shear deformation analysis of the middle nodes, side nodes, corner nodes and the joints in the roof of the SRC plane frame is analyzed. The results show the internal stress of the node. It is mainly distributed in the core zone type steel web, the concrete baroclinic short column inside the steel flange and the concrete baroclinic short column confined by the outer stirrup in the core area, which provides the basis for the establishment of shear transfer formula.
4. the shear block model used to simulate the shear deformation of SRC nodes is proposed, and the latest 2D node element theory is combined with the present stage to construct the SRC node unit. According to the structural characteristics of the SRC node and the internal stress transmission mode and distribution, it is believed that the shear of the beam column joint of the SRC frame should be composed of the core section steel web, the internal baroclinic bar and the external baroclinic pressure. In connection with the three parts of the bar, combining the nonlinear constitutive model of the main building material, the shear transfer formula of SRC node is proposed. At the same time, the shear block model used to simulate the shear deformation of the SRC node is established, and the shear block model is finally established to simulate the shear deformation of the barotropic bar. Then the shear block model is compiled into a computing program by using the C++ computer language. In order to invoke the 2D node unit program, the SRC node unit is reflected numerically.
5. the method of finely simulating the SRC beam column component with the fiber element is combined with the SRC beam column node element, and the macro finite element calculation model of the SRC frame is established based on the OpenSEES software platform. The test results and the simulation results show that the SRC frame model established by this method is better to simulate the mechanical response of the SRC frame under cyclic loading.
【學位授予單位】：西安建筑科技大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU398.9

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本文編號：1999918