本文選題：鋼板混凝土組合剪力墻 + 高性能混凝土　； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：鋼板混凝土組合剪力墻結(jié)構(gòu)因強度高、抗側(cè)移剛度大、延性好等特點常用于超高層建筑、重要的大跨度建筑中。鋼板混凝土組合剪力墻結(jié)構(gòu)為了滿足高強度、超高泵送等的要求，常選用高流動性、自密實的高性能混凝土。然而，高性能混凝土的水泥用量大，水化熱多，施工早期受溫度影響的收縮變形明顯，在鋼板、栓釘?shù)募s束下其內(nèi)部容易形成較大的應(yīng)力而開裂，最終影響耐久性。所以，為了減輕開裂程度，有必要研究鋼板混凝土組合剪力墻施工早期溫度裂縫的控制措施，以便為實際工程的設(shè)計、施工提供參考。 作為溫度的內(nèi)熱源，水化熱本身會隨時間變化，澆筑后混凝土以熱對流的方式向空氣散熱且內(nèi)外散熱的速度不均，引起溫度梯度，進而產(chǎn)生溫差內(nèi)應(yīng)力。因此，鋼板混凝土組合剪力墻在施工早期因水化熱引起的溫度場以及由此引起的應(yīng)力場是一個復(fù)雜的空間、時間耦合的物理問題，相關(guān)的分析參數(shù)難以確定。所以，在模擬分析水化熱對混凝土溫度場的影響時常假定混凝土是一種各向同性材料。 計算機的快速發(fā)展促進了數(shù)值分析技術(shù)的改進，并涌現(xiàn)出許多大型通用有限元軟件，為模擬鋼板混凝土組合剪力墻在施工早期的溫度裂縫提供了有效的分析工具。本文利用ABAQUS軟件進行鋼板混凝土組合剪力墻施工早期的溫度裂縫分析。分析時，先建立三個模型來研究混凝土水化熱與溫度的關(guān)系，它們分別是單層鋼板混凝土組合剪力墻模型，循環(huán)冷卻水作用下的鋼板混凝土組合剪力墻模型，逐層澆筑的三層鋼板混凝土組合剪力墻模型。隨后根據(jù)水化熱引起的溫度變化規(guī)律，模擬鋼板混凝土組合剪力墻的溫度應(yīng)力和溫度裂縫，最后得出如下結(jié)論： ①鋼板混凝土組合剪力墻施工早期在水化熱和外界環(huán)境的影響下，先升溫很快，然后緩慢降溫。同時，整個過程中內(nèi)外混凝土存有溫度梯度，內(nèi)部溫度高，外部溫度低。隨著施工期延長，混凝土的內(nèi)外溫度趨于穩(wěn)定并與環(huán)境溫度相同。 ②鋼板混凝土組合剪力墻中設(shè)置循環(huán)冷卻管后可以降低水化熱引起的內(nèi)部最高溫度，減小高溫區(qū)范圍，并使溫度分布更均勻。因此，施工時在鋼板混凝土組合剪力墻內(nèi)部設(shè)置循環(huán)水冷卻管能夠?qū)κ┕ぴ缙诘臏囟攘芽p進行有效地控制。 ③鋼板混凝土組合剪力墻逐層澆筑時上下層混凝土?xí)嗷ビ绊�，上層混凝土的水化熱會使下層混凝土溫度回升，這將會導(dǎo)致上下層混凝土的交接薄弱層開裂。因此，在澆筑上層混凝土?xí)r應(yīng)對下層混凝土的上部進行加強處理。 ④鋼板混凝土組合剪力墻中栓釘和鋼板對混凝土施工早期的溫度收縮變形具有較強的約束作用，同時栓釘具有誘導(dǎo)開裂的不利作用。 ⑤一定范圍內(nèi)，鋼板混凝土組合剪力墻栓釘?shù)拈g距越小，混凝土的溫度應(yīng)力分布越均勻，且出現(xiàn)的裂縫越少。所以，在滿足施工條件下把栓釘?shù)拈g距設(shè)計越小對其溫度裂縫的控制越有利。
[Abstract]:Steel concrete composite shear wall structure with high strength, lateral stiffness, good ductility and other features commonly used in high-rise building, the construction of large span steel concrete composite shear wall structure. In order to meet the high strength, high pumping and other requirements, often with high mobility, self compacting high performance concrete however, the amount of cement high performance concrete, hydration heat, the early shrinkage is affected by temperature deformation obviously, in steel studs under the constraints of its internal easy to form larger stress cracking, ultimately affect the durability. So, in order to reduce the degree of cracking control measures, it is necessary to study the concrete composite plate shear wall construction early temperature crack, in order for the actual engineering design, construction to provide the reference.
As the internal heat source temperature, hydration heat itself will change with time, after pouring concrete to convection to heat and air inside and outside the cooling speed is not uniform, caused by temperature gradient, resulting in temperature stress. Therefore, the temperature field of steel plate concrete composite shear wall construction in the early stage because of the hydration heat caused therefrom the stress field is a complex space time coupling physical problems, analysis of related parameters are difficult to determine. So, the simulation analysis of the influence of hydration heat on the temperature field of concrete often assumes that concrete is a kind of isotropic material.
The rapid development of computer technology promotes the improvement of numerical analysis, and the emergence of many large-scale general finite element software to simulate the steel-concrete composite shear wall in the construction of early temperature cracks provide an effective analysis tool. In this paper, steel concrete composite shear wall analysis of concrete temperature crack in the construction of early using ABAQUS software. The analysis. The first three models were established to study the hydration heat of concrete and temperature, they are single steel concrete composite shear wall model, circular steel plate concrete composite shear wall model of cooling water under the action of three layers of steel concrete composite shear wall model of casting layer by layer. Then according to the variation of temperature caused by hydration heat and the simulation of sprcw temperature stress and temperature crack, the final conclusion is as follows:
The steel-concrete composite shear wall construction in the early stage of hydration heat and the external environment under the influence of the first heat up quickly, and then slow down. At the same time, the whole process inside and outside the concrete has the temperature gradient, high internal temperature, external temperature is low. With the construction period, the concrete internal and external temperature stable and identical with the ambient temperature.
The steel-concrete composite shear wall arranged in the cooling tube can reduce the maximum internal temperature caused by hydration heat, reduce the high temperature area, and makes the temperature distribution more uniform. Therefore, in the construction of internal steel plate concrete composite shear wall tube can effectively control the temperature crack of the early construction of the circulating cooling water.
The steel-concrete composite shear wall with concrete pouring on the lower layer will influence each other, the hydration heat of concrete will make the upper lower concrete temperature rise, it will cause the lower concrete transition weak layer cracking. Therefore, in the pouring of concrete to the upper upper lower concrete for strengthening treatment.
The steel stud and steel concrete composite shear wall has a strong restriction on the early shrinkage of concrete construction temperature deformation, and has the adverse effect of stud induced cracking.
In a certain range, spacing of steel-concrete composite shear wall studs is smaller, the concrete temperature stress distribution is more uniform, and the crack appeared less. So, in the conditions to meet the construction design of the studs spacing is to control the temperature crack more favorable.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU765

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