本文關(guān)鍵詞：圓鋼管柱混凝土在焊接高溫下力學性能的研究　出處：《合肥工業(yè)大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 圓鋼管混凝土柱 有限元 溫度場 核心混凝土 力學性能

【摘要】：鋼管混凝土柱是由鋼管及其中澆筑的混凝土而形成的構(gòu)件。通過鋼管和混凝土之間在受力過程中的相互作用,即混凝土受到鋼管的約束作用處于復雜應(yīng)力狀態(tài)之下,進而提高混凝土的強度,塑性和韌性性能大為改善。同時,組成鋼管混凝土柱的鋼管和混凝土之間具有相互貢獻、協(xié)同互補、共同工作的特點,這種構(gòu)件也具備較好的耐高溫性能。在逆作法施工工程中,當圓鋼管混凝土柱外部搭接梁時,需在圓鋼管外焊接外環(huán)板用來支撐梁的內(nèi)部鋼筋骨架,焊接時產(chǎn)生的高溫通過圓鋼管傳熱到混凝土。隨著溫度升高,混凝土中骨料和水泥石由于發(fā)生膨脹,混凝土在圓鋼管的約束作用下產(chǎn)生內(nèi)應(yīng)力,導致應(yīng)力集中嚴重,形成微裂縫,由此降低核心混凝土的強度,對圓鋼管混凝土柱的力學性能及其極限承載力產(chǎn)生不利影響。因此研究圓鋼管混凝土柱在焊接溫度場和荷載作用下力學性能的變化具有一定的工程意義。本文主要研究圓鋼管混凝土柱在焊接高溫下的溫度場和軸向荷載作用下的應(yīng)力-應(yīng)變關(guān)系和構(gòu)件極限承載力的研究。論文通過有限元軟件ANSYS、ABAQUS對圓鋼管混凝土柱外環(huán)板在焊接高溫作用下的溫度場分布情況進行模擬,并對圓鋼管混凝土柱外環(huán)板位置在溫度場基礎(chǔ)上施加軸向荷載作用下核心混凝土力學性能進行研究。結(jié)果表明,當外環(huán)板焊接位置溫度上升到約400℃時,在焊接溫度場的影響下,會導致核心混凝土屈服應(yīng)力降低明顯,同時在施加軸向荷載時會使圓鋼管柱混凝土截面承載力降低顯著。論文研究的目的在于為實際工程設(shè)計和施工提供一些參考依據(jù)。
[Abstract]:Concrete-filled steel tubular column (CFST) is a member formed by steel tube and concrete-filled steel tube through the interaction between steel tube and concrete in the process of loading. That is to say, the concrete is confined by the steel tube in the state of complex stress, and then improve the strength, plasticity and toughness of the concrete. At the same time. Concrete-filled steel tube and concrete column have the characteristics of mutual contribution, cooperation and mutual work, this kind of member also has better high-temperature resistance in the reverse construction project. When the concrete filled circular steel tube column is connected with the external beam, the outer ring plate should be welded outside the circular steel tube to support the internal steel frame of the beam. The high temperature generated by welding heat transfer to concrete through the circular steel tube. With the increase of temperature. Due to the expansion of aggregate and cement stone in concrete, the internal stress of concrete is produced under the constraint of circular steel pipe, which leads to the serious stress concentration and the formation of micro-cracks, thus reducing the strength of the core concrete. The mechanical properties and ultimate bearing capacity of CFST columns are adversely affected. Therefore, it is of engineering significance to study the variation of mechanical properties of CFST columns under welding temperature field and load. In order to study the stress-strain relationship and ultimate bearing capacity of concrete-filled steel tubular columns under welding temperature and axial load, the finite element software ANSYS is used in this paper. ABAQUS is used to simulate the distribution of temperature field of circular concrete-filled steel tubular columns under welding high temperature. The mechanical properties of core concrete under axial load on the basis of temperature field are studied. The results show that when the welding temperature of outer ring plate rises to about 400 鈩，

本文編號：1394797