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  本文選題：溫度場　切入點：溫度作用　出處：《長沙理工大學》2014年碩士論文

【摘要】：砌體結(jié)構(gòu)房屋的頂層墻體和屋蓋之間的體積變形差受到相互約束引起墻體產(chǎn)生內(nèi)力,當內(nèi)力超過墻體破壞強度時會導致墻體開裂,從而影響結(jié)構(gòu)的正常使用。體積變形主要由溫度作用和砌體墻干燥收縮組成。首先,考慮房屋所處地區(qū)、朝向、顏色、保溫形式等影響因素,利用傅里葉級數(shù),將空氣綜合溫度簡化成諧波熱作用和穩(wěn)態(tài)溫度作用疊加,采取變量分離法得到多層墻在諧波熱作用下溫度場的解析解求解方法。其次,將解析解所求的年溫差和日溫差進行組合,得到圍護結(jié)構(gòu)的溫度荷載,再通過與砌體墻干燥收縮變形所產(chǎn)生的等效溫度荷載組合,計算出墻體最大體積變形作用。第三,利用排架比擬法和有限元分析法,求出頂層墻體的內(nèi)力,得到了剪力在墻體中的分布規(guī)律。排架法計算結(jié)果發(fā)現(xiàn),墻體中剪力由中間窗間墻向最外端窗間墻呈遞增的規(guī)律；有限元分析法計算結(jié)果表明,外端第二個窗間墻剪力最大,除最外端窗間墻受軸向拉力外,其于窗間墻受軸向壓力。通過對內(nèi)力值的數(shù)學回歸,推導出砌體房屋頂層墻的溫度作用簡化計算公式。對比兩種計算方法的優(yōu)劣,有限元法求出的內(nèi)力大小及分布情況的準確性更高。最后,利用溫度內(nèi)力簡化計算公式和砌體結(jié)構(gòu)抗剪強度公式,計算出頂層墻在不同工況作用下的最大伸縮縫間距和不設伸縮縫情況下的墻體最小配筋率或是否設置構(gòu)造柱,據(jù)此提出了“放”和“抗”的裂縫控制措施。
[Abstract]:The volume deformation difference between the top floor wall and the roof of the masonry structure house is constrained mutually, which will cause the wall to crack when the internal force exceeds the failure strength of the wall. The volume deformation is mainly composed of temperature and dry shrinkage of masonry wall. First of all, considering the area, orientation, color, insulation form and other influencing factors of the building, the Fourier series is used. The synthetic air temperature is simplified as the superposition of harmonic thermal action and steady-state temperature action, and the analytical solution to the temperature field of multistory wall under harmonic heat action is obtained by using the variable separation method. Secondly, The annual temperature difference and the daily temperature difference obtained from the analytical solution are combined to obtain the temperature load of the enclosure structure. Then the maximum volume deformation of the wall is calculated by combining the equivalent temperature load with the equivalent temperature load caused by the dry shrinkage deformation of the masonry wall. The internal force of the top floor wall is obtained by using the method of frame analogy and finite element analysis, and the distribution law of shear force in the wall is obtained. The results of the calculation by the bent frame method show that the shear force in the wall increases from the middle window wall to the outermost window wall. The results of finite element analysis show that the shear force of the second window wall at the outer end is the largest, except that the wall between the outer end window is subjected to axial tension, and the wall between the windows is subjected to axial pressure. A simplified formula for calculating the temperature effect of the top wall of masonry building is derived. Comparing the advantages and disadvantages of the two methods, the accuracy of the internal force and the distribution of the internal force calculated by the finite element method is higher. Finally, By using the simplified formula of internal force of temperature and the formula of shear strength of masonry structure, the maximum expansion joint spacing of top wall under different working conditions and the minimum reinforcement ratio of wall without expansion joint or whether or not to install structural columns are calculated. Accordingly, the crack control measures of "release" and "resistance" are put forward.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU364

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相關(guān)期刊論文 前1條

1 李紅梅,金偉良,葉甲淳,王有為;建筑圍護結(jié)構(gòu)的溫度場數(shù)值模擬[J];建筑結(jié)構(gòu)學報;2004年06期

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本文編號：1661771