本文選題：鋼筋混凝土 + 框架結構�。� 參考：《沈陽建筑大學》2014年碩士論文

【摘要】：地震作用下結構非線性反應與倒塌破壞的研究是結構工程學科的一項重要課題,也是目前的研究熱點之一。盡管國內外學者們已對此提出了一些數(shù)值分析方法,但這些方法仍難以較好地對結構進行從彈性到塑性、從小變形到大變形直至倒塌塌落的全過程分析。作為一種非連續(xù)性的數(shù)值分析方法,離散單元法不要求單元之間位移協(xié)調,適用于結構倒塌破壞中的位移場不連續(xù)、接觸碰撞以及大位移、大轉動等問題的求解。離散單元法首先是在巖土工程領域發(fā)展起來的,目前已逐步用于結構的非線性地震反應與倒塌破壞機理分析研究。而以往的離散單元計算模型由于模型中的本構關系沒有明確的物理意義且單元數(shù)目巨大,很難用于大型復雜結構的倒塌破壞分析,特別是以往方法對于結構倒塌前的非線性性能模擬的準確性尚需進一步進行研究。本文主要對離散單元法在鋼筋混凝土框架結構的非線性分析中的應用進行研究,具體工作如下：1.在查閱大量國內外文獻的基礎上,對結構非線性與倒塌分析的數(shù)值分析方法,尤其是離散單元法在結構工程領域的研究現(xiàn)狀進行了總結、評述。并對基于離散單元法提出的桿段多彈簧模型作了改進研究,通過在彈簧組中添加扭轉彈簧來滿足構件的多向加載以及模擬構件扭轉性能的需求。2.運用桿段多彈簧模型以及本文SMS-Collapse程序,對低周往復加載下鋼筋混凝土柱的受力行為進行了數(shù)值模擬,并與試驗結果及有限元模擬結果進行了對比研究。分析結果表明,桿段多彈簧模型能夠準確描述混凝土梁柱構件的軸力-彎矩耦合效應,并可細致描述截面材料的力學行為發(fā)展歷程。本文模型能夠較準確地描述鋼筋混凝土梁柱構件在低周往復荷載下的非線性滯回行為。3.對低周反復水平荷載作用下的鋼筋混凝土平面框架進行了數(shù)值模擬,計算結果與試驗結果吻合良好。說明本文所建立的結構計算分析模型是合理的,SMS-Collapse程序可以真實、正確描述結構的反應,能適用于整體結構的非線性分析,并具有較高的精度。4.對鋼筋混凝土框架結構非線性反應與倒塌仿真分析程序SMS-Collapse進行二次開發(fā)。采用FORTRAN語言對本程序前處理模塊進行改進,添加了前處理模型INPUT文本輸出、自定義材料子程序接口兩個模塊,用戶能夠在INPUT文本中直接修改模型參數(shù)并且調用已有的單軸材料本構模型,大大提高了程序的通用性和可拓展性。5.對離散單元法中的結構靜力算法進行改進,通過采用準靜態(tài)加載方法來降低慣性力效應對結構靜力加載的影響。準靜態(tài)加載方法在處理非線性問題時無需迭代求解,與以往的迭代算法相比,在保證計算精度的前提下大大降低了計算工作量。
[Abstract]:The study of nonlinear response and collapse failure of structures under earthquake action is an important subject in the field of structural engineering, and is also one of the research hotspots at present. Although scholars at home and abroad have put forward some numerical analysis methods, it is still difficult to analyze the whole process of structure from elasticity to plasticity, from small deformation to large deformation to collapse and collapse. As a discontinuous numerical analysis method, the discrete element method does not require the coordination of displacement between the elements, and is suitable for the solution of discontinuous displacement field, contact collision, large displacement and large rotation in the collapse and failure of structures. The discrete element method has been developed in the field of geotechnical engineering and has been applied to the analysis and study of nonlinear seismic response and collapse failure mechanism of structures. However, the previous discrete element calculation model is difficult to be used to analyze the collapse failure of large and complex structures because the constitutive relation in the model has no explicit physical meaning and the number of elements is huge. In particular, the accuracy of the nonlinear performance simulation before the collapse of the structure by the previous methods needs to be further studied. In this paper, the application of discrete element method in nonlinear analysis of reinforced concrete frame structures is studied. The specific work is as follows: 1. On the basis of consulting a large number of literatures at home and abroad, the numerical analysis methods of nonlinear and collapse analysis of structures, especially the research status of discrete element method in the field of structural engineering, are summarized and reviewed. An improved multi-spring model based on discrete element method is proposed. The torsion spring is added to the spring group to meet the requirements of multi-direction loading and torsional performance simulation. By using the multi-spring model and SMS-Collapse program, the behavior of reinforced concrete columns under low-cycle reciprocating loading is numerically simulated and compared with the experimental results and finite element simulation results. The results show that the multi-spring model can accurately describe the coupling effect of axial force and bending moment of concrete Liang Zhu members, and can be used to describe the development of mechanical behavior of cross-section materials in detail. The model in this paper can accurately describe the nonlinear hysteretic behavior of reinforced concrete Liang Zhu members under low cycle reciprocating loads. The numerical simulation of reinforced concrete plane frame under low cyclic horizontal load is carried out, and the calculated results are in good agreement with the experimental results. It is shown that the structural calculation and analysis model established in this paper is reasonable, and the SMS-Collapse program can describe the response of the structure correctly, and it can be applied to the nonlinear analysis of the whole structure, and has a higher accuracy. The simulation program SMS-Collapse for nonlinear response and collapse of reinforced concrete frame structures is developed. The preprocessing module of this program is improved by FORTRAN language. Two modules are added: input text output of pre-processing model and interface of self-defined material subroutine. The user can modify the model parameters directly in input text and call the existing uniaxial material constitutive model, which greatly improves the generality and expansibility of the program. The structure static method in discrete element method is improved, and the quasi-static loading method is adopted to reduce the influence of inertial force effect on the static loading of the structure. The quasi-static loading method does not need to be solved iteratively when dealing with nonlinear problems. Compared with the previous iterative algorithms, the computational workload is greatly reduced under the premise of ensuring the accuracy of the calculation.
【學位授予單位】：沈陽建筑大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU375.4

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