本文選題：離散單元法　切入點(diǎn)：平面外受力性能　出處：《武漢理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在地震或者風(fēng)荷載作用下,墻體的面外剛度不足往往引起墻體面外倒塌,造成人員傷亡和財(cái)產(chǎn)損失,因此墻體的面外受力性能研究顯得格外重要。由于墻體是由塊體和砂漿兩相材料組砌而成,材料性能差異較大,墻體的非均質(zhì)性導(dǎo)致其受力性能極其復(fù)雜,在進(jìn)行非線性分析時(shí)往往會(huì)出現(xiàn)破壞準(zhǔn)則定義困難、收斂速度慢、甚至不收斂等問題,通常的處理方式是將塊體與砂漿進(jìn)行均質(zhì)化(RVE),而這也只是一種粗略的近似,適用于宏觀模型的力學(xué)分析,對(duì)于單片墻體需要更精細(xì)化的方式處理,此時(shí)應(yīng)考慮塊體與砂漿之間的相互作用以及材料差異引起的影響。巖體中的結(jié)構(gòu)面為巖體的“薄弱層”,這與砌體結(jié)構(gòu)的砂漿層相似,砌體結(jié)構(gòu)的砂漿層、砂漿與塊體之間的接觸面是砌體最容易產(chǎn)生破壞的位置。本文借鑒分析巖石力學(xué)的方法分析砌體結(jié)構(gòu),對(duì)砂漿和塊體采取分離式建模,砂漿與塊體之間的接觸面采用巖石中的“節(jié)理面”模擬,基于離散單元法,針對(duì)墻體平面外受力性能,開展了如下三個(gè)方面的工作:1)基于離散單元法模擬分析阿德萊德大學(xué)Griffith教授關(guān)于無筋墻體力學(xué)性能試驗(yàn)中的Wall1和Wall3墻體,通過對(duì)比數(shù)值分析結(jié)果與試驗(yàn)結(jié)果,驗(yàn)證了建模方法、材料參數(shù)定義、破壞準(zhǔn)則定義的合理性,為后面定性地分析各參數(shù)對(duì)砌體墻平面外受力性能影響分析提供依據(jù)。2)研究墻體的幾何參數(shù)、邊界條件對(duì)砌體墻平面外受力性能的影響,建立了不同高厚比、豎向壓力以及高寬比數(shù)值模型,分析了各種參數(shù)對(duì)墻體面外性能的影響規(guī)律,得到了不同高寬比、高厚比以及不同豎向壓力墻體的極限荷載和破壞模式。3)對(duì)配筋墻體進(jìn)行數(shù)值模擬分析,對(duì)比分析了無筋墻體與配筋墻體承載力、延性、破壞模式的不同以及鋼筋對(duì)配筋墻體的作用機(jī)理;模擬了不同配筋率、不同配筋方式對(duì)墻體承載力、開裂荷載及破壞過程的影響,提出了墻體的合理配筋率以及最優(yōu)配筋方式。
[Abstract]:Under the action of earthquake or wind load, the lack of out-of-plane stiffness of the wall often causes the out-of-plane collapse of the wall, resulting in casualties and property losses. Therefore, it is very important to study the out-of-plane mechanical properties of the wall. Because the wall is made of block and mortar two-phase materials, the material performance is different, and the heterogeneity of the wall makes its mechanical performance extremely complex. In nonlinear analysis, the failure criterion is difficult to define, the convergence rate is slow, and even does not converge. The usual treatment is to homogenize the block and mortar, but this is only a rough approximation. For the mechanical analysis of macroscopic model, the monolithic wall needs to be treated in a more detailed way. The interaction between block and mortar and the influence caused by material difference should be considered. The structural plane in rock mass is the "weak layer" of rock mass, which is similar to the mortar layer of masonry structure, and the mortar layer of masonry structure. The contact surface between mortar and block is the most easily damaged position of masonry. In this paper, the masonry structure is analyzed by using the method of rock mechanics, and the mortar and block are modeled separately. The interface between mortar and block is simulated by "joint surface" in rock. Based on the discrete element method, the mechanical behavior of the wall outside the plane is analyzed. The following three aspects of work were carried out: 1) based on discrete element method, the Wall1 and Wall3 walls in mechanical performance tests of unstiffened walls were simulated and analyzed by Professor Griffith of the University of Adelaide. The modeling method was verified by comparing the results of numerical analysis with the experimental results. The definition of material parameters and failure criteria is reasonable, which provides a basis for the qualitative analysis of the influence of each parameter on the mechanical behavior of masonry wall outside the plane. 2) the geometric parameters of the wall are studied. The influence of boundary conditions on the behavior of the masonry wall outside the plane is studied. The numerical models of different height-thickness ratio, vertical pressure and aspect ratio are established, and the influence of various parameters on the out-of-plane performance of masonry wall is analyzed, and the ratio of height to width is obtained. The ratio of height to thickness and the ultimate load and failure mode of different vertical pressure wall are analyzed by numerical simulation, and the bearing capacity and ductility of the reinforced wall and the reinforced wall are compared and analyzed. Different failure modes and the action mechanism of reinforcement on reinforced wall are simulated, and the effects of different reinforcement ratio and different reinforcement ways on the bearing capacity, cracking load and failure process of the wall are simulated, and the reasonable reinforcement ratio and the optimal reinforcement mode of the wall are put forward.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU364

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