【摘要】：隨著城市化的進程,中國經(jīng)濟的發(fā)展,我國城市建設也進入了飛速發(fā)展階段。高層及超高層等建筑的不斷涌現(xiàn),對基礎埋置的深度要求越來越高,城市用地越來越緊張,需大量開發(fā)地下空間。高層建筑的多層地下室、地下大型停車場、地下商場等大型地下建筑面臨最核心的問題就是抗浮設計。但在實際的抗浮設計中,設計人員往往忽略了抗浮結構優(yōu)化布置及抗浮結構與主體結構共同作用和變形協(xié)調(diào),從而使得抗浮結構的設計較為浪費甚至設計錯誤。本論文主要考慮抗浮結構抗浮錨桿優(yōu)化布置及抗浮結構與主體結構共同作用和變形協(xié)調(diào),對抗浮工程進行多種抗浮結構抗浮錨桿方案對比分析優(yōu)化,總結出具有普遍適用性的優(yōu)化方案,同時對抗浮特性進行了研究。具體工作如下:(1)本文研究研究了地下抗浮設防水位,確定了水浮力的計算公式。用SAP2000和Midas building對筏板建模,建立帶下柱墩筏板和梁板式筏基底板模型。分析了在錨桿布置方式、錨桿的剛度、筏板厚度、水浮力等參數(shù)的影響下筏板撓度、裂縫、彎矩的變化規(guī)律。(2)進行抗浮錨桿進行現(xiàn)場原位試驗,分析了在分級荷載下錨桿軸力的變化規(guī)律。繪制了現(xiàn)場原位試驗U~δ曲線,為有限元模擬提供數(shù)據(jù)支持。(3)利用有限元軟件ABAQUS對抗浮錨桿進行數(shù)值模擬,分析在不同荷載和不同錨桿長度的情況下錨桿與土體的變形、錨桿的軸力分布,并與工程試驗對比分析,為實際項目提供參考。模擬群錨效應,分析了錨桿群在群錨效應下的受力與變形。(4)利用有限元軟件ABAQUS和現(xiàn)場試驗的研究工作基礎上,開展了抗浮錨桿的受力變形的理論分析。
[Abstract]:With the process of urbanization and the development of Chinese economy, China's urban construction has entered a rapid development stage. With the continuous emergence of high-rise and super-high-rise buildings, the requirements for the depth of foundation burial are becoming higher and higher, and the urban land use is becoming more and more tight, so a large number of underground space needs to be developed. Anti-floating design is the core problem faced by large underground buildings such as multi-storey basement, underground parking lot, underground shopping mall and so on. However, in the actual anti-floating design, the designers often ignore the optimal arrangement of anti-floating structure and the coordination of the anti-floating structure and the main body structure, which makes the design of anti-floating structure more wasteful and even wrong. In this paper, the optimum arrangement of anti-floating anchor rod and the coordination of anti-floating structure and main structure are considered, and the anti-floating structure anti-floating bolt scheme is compared and optimized. The optimization scheme with universal applicability is summarized, and the anti-floating characteristic is studied. The main works are as follows: (1) the water level of anti-floating fortification is studied in this paper, and the formula of water buoyancy is determined. SAP2000 and Midas building were used to model the raft plate with column piers and beam-slab raft foundation floor model. The variation law of raft deflection, crack and bending moment under the influence of anchor arrangement, anchor stiffness, raft thickness and water buoyancy are analyzed. (2) the in-situ test of anti-floating anchor rod is carried out. The variation law of axial force of anchor under graded load is analyzed. The U未 curve of in-situ test is drawn to provide data support for finite element simulation. (3) the deformation of anchor and soil under different loads and different length of anchor is analyzed by using finite element software ABAQUS to carry out numerical simulation against floating anchor. The axial force distribution of the anchor rod is compared with the engineering test, which provides a reference for the actual project. The stress and deformation of anchor group under group anchor effect are analyzed. (4) based on the research work of finite element software ABAQUS and field test, the mechanical deformation of anti-floating bolt is analyzed theoretically.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU476

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