本文關(guān)鍵詞：約束狀態(tài)對混凝土溫度變形和溫度應(yīng)力的影響探討　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 混凝土結(jié)構(gòu) 約束狀態(tài) 溫度應(yīng)力 溫度變形 溫度變形系數(shù)

【摘要】：溫度應(yīng)力是一項重要的結(jié)構(gòu)荷載,有時甚至?xí)蔀榻Y(jié)構(gòu)在運行過程中開裂或破壞的關(guān)鍵因素。絕大多數(shù)混凝土建筑物所處環(huán)境的溫度都是交替變化的,溫度應(yīng)力的產(chǎn)生和影響是無法避免的�；诨炷翜囟葢�(yīng)力分析和測定的重要性和混凝土溫度應(yīng)力計算值與實測值存在著較大差異,本文通過設(shè)計實驗方法,進(jìn)行實驗室直接測定混凝土試件的溫度變形的溫度應(yīng)力。通過實測的溫度變形和溫度應(yīng)力與理論計算的結(jié)果對比,探討分析各個影響因素對混凝土溫度變形和溫度應(yīng)力的影響。試驗結(jié)果表明,在溫度變化大致相同時,混凝土試件的溫度變形量與其初始應(yīng)力狀態(tài)密切相關(guān),初始壓應(yīng)力越大,試件所受的約束作用越強(qiáng),產(chǎn)生的溫度變形量越小。針對實測溫度應(yīng)力小于理論計算溫度應(yīng)力的問題主要進(jìn)行以下探討:一、簡單推導(dǎo)對了彈性力學(xué)的溫度應(yīng)力理論計算公式。二、試驗驗證了混凝土彈性模量在常溫范圍內(nèi)(20~70℃)的隨溫度變化是可以忽略不計的。三、對受壓狀態(tài)下混凝土的熱膨脹機(jī)理進(jìn)行了探討。首先探討了均勻材料的受壓熱膨脹機(jī)理,混凝土材料在這個基礎(chǔ)上還有自身獨特的變形規(guī)律。其次用鋼管的溫度變形試驗驗證了鋼管在受壓狀態(tài)下的溫度變形規(guī)律,證實鋼管在受壓情況下,其溫度膨脹變形也要小于自由狀態(tài),但是受壓狀態(tài)下鋼管溫度變形量的減小程度要比混凝土試件小得多。四、根據(jù)已有的研究成果和試驗過程中實際溫度變形量小于理論計算量的試驗現(xiàn)象,著重分析了混凝土試件在受壓狀態(tài)下的溫度變形規(guī)律,提出了“混凝土溫度變形系數(shù)φ”新概念,并利用溫度應(yīng)力理論計算公式反演分析,得到了混凝土溫度變形系數(shù)φ與混凝土初始壓應(yīng)力的關(guān)系。通過這些探討分析,在實際工程中,當(dāng)計算結(jié)構(gòu)或者構(gòu)件的溫度應(yīng)力時,應(yīng)該考慮應(yīng)力狀態(tài)對其溫度變形性能的影響。
[Abstract]:The temperature stress is an important structural load, sometimes even will become a key factor in cracking or failure during operation. The vast majority of concrete buildings, the environmental temperature is alternating, and the influence of temperature stress is unavoidable. The concrete temperature stress calculation value exists the big difference with the measured value of stress analysis and determination of the importance and concrete temperature based on the experimental design method for direct determination of laboratory concrete specimen temperature deformation temperature stress. The temperature deformation and temperature stress calculation of measured and theoretical results, to explore the influence of various factors on temperature deformation analysis the temperature and stress of concrete. The experimental results show that the temperature changes are almost the same, the temperature and the initial deformation stress state is closely related to concrete, initial pressure The greater the stress test, the stronger one by a constraint, the temperature deformation amount is smaller. According to the measured temperature stress is smaller than the theoretical calculation of the temperature stress problem is mainly the following discussion: first, simple derivation of the formula of elastic mechanics theory. The temperature stress of the concrete elastic test two. Modulus in the normal range (20~70 C) with the change of temperature is negligible. Three, the expansion mechanism of concrete under compression heat are discussed. First discusses the expansion mechanism of Pressurized Thermal homogeneous materials, concrete materials on this basis has its own unique deformation law. Secondly with the temperature of steel pipe deformation tests verify the deformation temperature under compression of the steel pipe, steel pipe that under the pressure, the temperature is less than the expansion of the free state, but the amount of deformation of the steel tube temperature under load decreases To a little more than a concrete test. Four, according to the phenomenon of the actual temperature deformation is less than the theoretical calculation results and the test process, analyzes the parts under compression temperature deformation of concrete, put forward the "new concept of temperature deformation coefficient, and using temperature calculation inversion formula for stress analysis theory, the relationship of concrete temperature coefficient and concrete initial deformation stress. Through these analysis, in practical engineering, when calculating the structure or component of the temperature stress, should be considered the stress state of deformation performance of the temperature.

【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528

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