本文選題：鋼板混凝土組合剪力墻 + 溫度場��； 參考：《吉林建筑大學》2017年碩士論文

【摘要】：鋼板混凝土組合剪力墻結構在當今的工程建設中,特別是在超高層與大跨度結構中,占有著舉足輕重的地位。鋼板混凝土組合墻常選用高性能混凝土,這主要歸功于其流動性與自密實性效果顯著,可以很大程度滿足對高強度與超高泵送方面的需求。但在施工過程中,由于所需的高性能混凝土水泥用量較多,因而在施工初期的水化放熱量也較大,這導致結構在內外溫度上形成了溫度差,在水化熱降溫階段,鋼板混凝土組合墻結構內部由于受到了溫度收縮作用的影響,促使結構內部產生了較大的拉應力,同時受到其內部鋼板、栓釘?shù)鹊募s束作用,使得結構產生了裂縫。在實際工程上,如天津117大廈等多個重大工程,在施工過程中就先后出現(xiàn)過鋼板混凝土組合墻開裂的現(xiàn)象,這嚴重影響了結構的耐久性。綜上,對鋼板混凝土組合剪力在施工過程中因溫度場與溫度應力而導致墻體開裂的研究顯的迫在眉睫。首先,本文總結了近幾年國內外對鋼板混凝土組合剪力墻裂縫控制方面的研究現(xiàn)狀,又著重闡述鋼板混凝土組合墻在溫控和溫度裂縫方面的理論認識。其次,從鋼板的施工、混凝土配合比的優(yōu)化設計及鋼板的監(jiān)測三方面制定了裂縫控制試驗方案。最后,利用ABAQUS有限元軟件對鋼板混凝土組合剪力墻因溫度變化引起裂縫產生的過程進行了模擬,模擬主要由兩部分組成,分別是在施工早期由混凝土水化熱引起結構內外溫度變化的過程與溫度下降段鋼板混凝土組合墻內部應力變化的過程。本文主要研究內容及最終結論:(1)對溫度場與溫度應力的基本理論及相關的有限元計算方法進行了歸納總結;(2)對鋼板混凝土組合剪力墻試驗方案制定方面,分別從鋼板的焊接工藝和結構施工、大體積高性能混凝土優(yōu)化設計等幾方面進行了研究和改進,并對28d的監(jiān)測的數(shù)據進行了歸納分析;(3)本文中的試驗墻取自北京某超高層的B3層14軸核心筒墻體,試驗墻的高為4.8m,厚度為1.2m,鋼板的厚度為38mm。通過對所監(jiān)測試驗墻的特點分析,并結合類似項目的傳感器布置經驗,擬在板內1/2高度處布置4個測點,每個測點按不同埋設深度布置3~7層傳感器,每層傳感器分為水平豎直兩個方向,用以監(jiān)測混凝土澆筑之后在不同時間段、不同深度上的應變變化及鋼板在相應時間的溫度變化;(4)通過ABAQUS的二次開發(fā)接口,編譯了高性能混凝土水化熱HETVAL用戶子程序,并最終實現(xiàn)了水化熱隨齡期的變化;(5)通過導入HETVAL子程序,對所建立的鋼板混凝土組合墻模型進行了溫度場的分析,并對比分析了理論模擬值與實測值,得出了一般規(guī)律;(6)采用彌散開裂模型對鋼板混凝土組合剪力墻模型進行了溫度應力的分析。最終,通過對比試驗實測結果與模擬分析結果得出以下結論:在鋼板的施工、混凝土的優(yōu)化設計等幾方面做了改進后的試驗墻,其真實裂縫的分布情況及出現(xiàn)的位置與模擬結果達到了基本吻合,這證明了在試驗中對鋼板的施工工藝和混凝土配合比的優(yōu)化設計,較為成功的控制住了鋼板混凝土組合剪力墻早期裂縫的出現(xiàn),這對未來在鋼板混凝土組合剪力墻早期裂縫的再研究具有積極的作用。
[Abstract]:Steel plate concrete composite shear wall structure plays an important role in the construction of today's engineering, especially in the super high rise and large span structure. The high performance concrete is often used in the steel plate concrete composite wall, which is mainly due to its remarkable fluidity and self compacting effect. It can greatly satisfy the high strength and super high pump delivery. But in the course of construction, because the required high performance concrete cement is more used, the hydration heat of the concrete at the beginning of the construction is also large, which leads to the formation of the temperature difference between the internal and external temperature. In the stage of the hydration heat and cooling, the internal structure of the steel plate concrete composite wall is influenced by the temperature shrinkage effect. In the actual project, such as Tianjin 117 mansion and other important projects, the cracking of the steel plate concrete composite wall appeared in the construction process, which seriously affected the durability of the structure. The research on the wall cracking caused by the temperature field and the temperature stress in the construction of the steel plate concrete shear force is imminent. Firstly, this paper summarizes the research status of the crack control of the steel plate concrete composite shear wall at home and abroad in recent years, and emphasizes on the temperature control and the temperature crack in the concrete composite wall of the steel plate. Secondly, from three aspects of the construction of steel plate, the optimum design of concrete mix ratio and the monitoring of steel plate, the test scheme of crack control is formulated. Finally, the ABAQUS finite element software is used to simulate the process of the crack caused by the temperature change of the steel plate concrete composite shear wall, and the simulation is mainly composed of two parts. The process of changes in the internal and external temperature of the structure inside and outside of the structure caused by the hydration heat of concrete at the early stage of construction and the internal stress change of the steel plate concrete composite wall at the temperature drop section. The main contents and final conclusions of this paper are as follows: (1) the basic theory of the temperature field and the temperature stress and the related finite element calculation method are summarized and summarized; (2) In the formulation of the test scheme for the steel plate concrete composite shear wall, the welding technology and construction of the steel plate, the optimization design of the large volume and high performance concrete are studied and improved respectively, and the data of the monitoring of the 28d are summarized and analyzed. (3) the test wall in this paper is taken from the 14 axis core tube of a super high rise in Beijing. The wall, the height of the test wall is 4.8m, the thickness is 1.2m, the thickness of the steel plate is 38mm. through the analysis of the characteristics of the monitoring test wall, and combined with the experience of the sensor arrangement of similar projects, 4 measuring points are arranged at the 1/2 height in the plate. Each measuring point is arranged at different embedment depth of the 3~7 layer sensor, and each layer is divided into two directions in a horizontal vertical direction, It is used to monitor the change of strain at different time, different depth and the temperature change at the corresponding time after concrete pouring. (4) through the two development interface of ABAQUS, the HETVAL user subroutine of high performance concrete hydration heat is compiled, and the change of the hydration heat with the age is finally realized; (5) by introducing the HETVAL subroutine, the The temperature field is analyzed in the model of steel plate concrete composite wall, and the general rules are obtained by comparing the theoretical values and the measured values. (6) the thermal stress analysis of the composite shear wall model of the steel plate concrete is analyzed by the diffusion cracking model. Finally, the results of comparison test and simulation analysis are obtained. The following conclusion: the improved test wall has been made in the construction of steel plate and the optimized design of concrete. The distribution of the real cracks and the location of the actual cracks are basically consistent with the simulation results. This proves that the steel plate is successfully controlled by the optimum design of the steel plate construction technology and the concrete mix ratio. The emergence of early cracks in concrete composite shear walls will play a positive role in the future study of early cracks in composite shear walls of steel plate and concrete.

【學位授予單位】：吉林建筑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU755.7

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