本文關(guān)鍵詞： 超長框架結(jié)構(gòu) 溫度應(yīng)力 基礎(chǔ)剛度 等效溫差 彈簧約束　出處：《蘇州科技學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：由于建筑功能與美觀的需要,要求建筑物不設(shè)置或者較少設(shè)置伸縮縫,從而導(dǎo)致結(jié)構(gòu)的伸縮縫間距遠大于規(guī)范規(guī)定的間距要求。對于超長混凝土結(jié)構(gòu),通常要研究的是結(jié)構(gòu)由于溫度變化所引起的應(yīng)力與變形。實際工程中常采用設(shè)置后澆帶、施加預(yù)應(yīng)力等措施來解決溫度應(yīng)力,然而設(shè)計中通常采取上部結(jié)構(gòu)嵌固的假定,從而忽略了基礎(chǔ)的實際剛度對超長混凝土結(jié)構(gòu)性能的影響。如果考慮基礎(chǔ)對結(jié)構(gòu)的有限約束剛度,則結(jié)構(gòu)設(shè)計更加接近實際,其受力性能將有所改善,也將使超長結(jié)構(gòu)的設(shè)計更具經(jīng)濟性、安全性。本文在大量理論支撐及分析的基礎(chǔ)上,借助有限元軟件ABAQUS做了以下幾個方面的研究,并得出了相應(yīng)成果。1.考慮有限基礎(chǔ)剛度,結(jié)構(gòu)樓板中溫度應(yīng)力與柱底嵌固假定模型相比有很大降低,應(yīng)力集中現(xiàn)象有所改善,底層柱底內(nèi)力明顯減小。通過改變基礎(chǔ)剛度調(diào)節(jié)結(jié)構(gòu)側(cè)移剛度也是緩解超長結(jié)構(gòu)溫度效應(yīng)的一種方法。2.根據(jù)現(xiàn)行樁基規(guī)范的方法計算樁基水平剛度與轉(zhuǎn)動剛度;運用有限元方法模擬樁-土共同作用,計算樁基基礎(chǔ)的水平剛度與轉(zhuǎn)動剛度。有限元數(shù)值模擬結(jié)果誤差較小,并可用于后續(xù)考慮基礎(chǔ)剛度的超長結(jié)構(gòu)溫度應(yīng)力分析;在基礎(chǔ)剛度有限元數(shù)值計算時,可取50倍樁徑的樁周土體參與共同模擬。3.研究超長混凝土結(jié)構(gòu)在季節(jié)溫差作用下結(jié)構(gòu)變形及內(nèi)力分布,分析超長結(jié)構(gòu)溫度應(yīng)力的影響因素。數(shù)據(jù)表明,結(jié)構(gòu)側(cè)移剛度對其溫度效應(yīng)影響較大,設(shè)計中要考慮底層層高對減小溫度應(yīng)力的有利作用。4.結(jié)合實際工程-蘇州軌道交通2號線太平車輛段上蓋平臺D2區(qū)工程,利用長期的現(xiàn)場監(jiān)測數(shù)據(jù)與有限元數(shù)值模擬結(jié)果對比,分析該超長結(jié)構(gòu)在使用階段有限元數(shù)值模擬與監(jiān)測數(shù)據(jù)的異同。分析中考慮混凝土徐變收縮時效特性,考慮有限基礎(chǔ)剛度。研究表明,有限基礎(chǔ)剛度對于超長結(jié)構(gòu)溫度應(yīng)力的有利影響不可忽略。
[Abstract]:Because of the need of building function and beauty, it is required that no or less expansion joints are set in the building, which leads to the space between expansion joints of the structure being much larger than the spacing required by the code. For super-long concrete structures, The stress and deformation of the structure caused by temperature change are usually studied. In practical engineering, measures such as setting post-pouring belt and applying prestress are often used to solve the thermal stress. However, the supposition that the superstructure is embedded is usually adopted in the design. Therefore, the influence of the actual stiffness of the foundation on the performance of the super-long concrete structure is neglected. If the finite restrained stiffness of the foundation on the structure is considered, the design of the structure is closer to the actual situation, and the mechanical performance of the structure will be improved. It will also make the design of super-long structure more economical and safe. Based on a large amount of theoretical support and analysis, this paper has done the following research with the help of finite element software ABAQUS, and has obtained the corresponding results. 1. Considering the stiffness of finite foundation, The temperature stress in the structure floor is much lower than that in the column bottom inlaid model, and the stress concentration phenomenon is improved. The internal force at the bottom of the bottom column is obviously reduced. Adjusting the lateral stiffness of the structure by changing the foundation stiffness is also a method to alleviate the temperature effect of the super-long structure. 2. The horizontal stiffness and rotational stiffness of the pile foundation are calculated according to the current method of pile foundation code. Using finite element method to simulate pile-soil interaction, the horizontal stiffness and rotational stiffness of pile foundation are calculated. The error of finite element numerical simulation results is small, and it can be used in the thermal stress analysis of super-long structure considering foundation stiffness. In the finite element calculation of foundation stiffness, the soil around the pile with 50 times the diameter of the pile participates in the simulation. 3. The structural deformation and internal force distribution of the super-long concrete structure under seasonal temperature difference are studied. The influence factors of the temperature stress of super-long structure are analyzed. The data show that the lateral stiffness of the structure has a great influence on the temperature effect. In the design, the beneficial effect of the height of the bottom layer on reducing the temperature stress should be considered. 4. Combining with the actual project, the D _ 2 area of the upper cover platform of Taiping depot of Suzhou Rail Transit Line 2 is compared with the finite element numerical simulation results by using the long-term monitoring data. The similarities and differences between the finite element numerical simulation and the monitoring data of the super-long structure are analyzed. The creep and shrinkage aging characteristics of concrete and the finite foundation stiffness are considered in the analysis. The favorable effect of finite foundation stiffness on the temperature stress of super long structure can not be ignored.
【學(xué)位授予單位】：蘇州科技學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU755

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