本文選題：型鋼混凝土 + SRC　； 參考：《鄭州大學(xué)》2017年碩士論文

【摘要】：作為一種新型的建筑結(jié)構(gòu)體系,SRC組合結(jié)構(gòu)在強度、延性耗能能力等方面都顯著優(yōu)于普通RC結(jié)構(gòu),具有良好的抗震性能。節(jié)點在梁柱之間擔(dān)任傳力樞紐,屬于框架結(jié)構(gòu)中的重要部位。在大多數(shù)地震中,很多建筑物的倒塌歸結(jié)于節(jié)點連接處破壞嚴重,而單一的梁柱本身破壞輕微,說明了節(jié)點的正常工作是確保整個結(jié)構(gòu)安全的前提。本文通過試驗研究和理論分析弄清楚SRC節(jié)點的受力機理和傳力途徑,得到合理的計算模型和構(gòu)造措施,為SRC組合結(jié)構(gòu)在工程實踐上的應(yīng)用提供可靠的參考。本文針對SRC節(jié)點眾多形式中的SRC柱-鋼梁節(jié)點展開研究,以軸壓比為主要因素,進行了4個節(jié)點的低周反復(fù)荷載試驗,并在其中一個試件的核心區(qū)配置X筋探討其能否提高混凝土的抗裂度。試驗結(jié)果表明4個節(jié)點的滯回曲線均比較飽滿,無明顯的捏攏現(xiàn)象,體現(xiàn)出良好的延性耗能能力。節(jié)點的破壞形式主要為剪切破壞,雖然軸壓力的存在可以抑制延緩混凝土裂縫的出現(xiàn)開展,但過大的軸壓力使節(jié)點的剪切破壞轉(zhuǎn)變?yōu)榱憾藦澢茐��；炷恋某趿押奢d很好地驗證了在核心區(qū)配置X筋能延緩裂縫的出現(xiàn),有效地提高混凝土的抗裂度。按照試驗數(shù)據(jù),把剪力實測值與理論值進行對比,對相關(guān)規(guī)范抗剪承載力計算公式提出修改建議。利用有限元軟件ABAQUS對試驗的四個試件進行數(shù)值模擬分析。結(jié)果表明試驗值與理論值整體吻合較好,說明了ABAQUS在模擬結(jié)構(gòu)非線性行為上具有很好的可行性,同時能較好地模擬結(jié)構(gòu)宏觀的損傷情況。在此基礎(chǔ)上,對混凝土強度等級、配箍率、加勁肋厚度、腹板厚度四個參數(shù)進行有限元分析,探討它們對節(jié)點承載力的影響。通過對比分析,發(fā)現(xiàn)增加腹板的厚度是提高節(jié)點承載力最直接有效的方式。
[Abstract]:As a new type of building structure system, SRC composite structure is superior to ordinary RC structure in strength, ductility energy dissipation and so on, and has good seismic performance. The node acts as the transmission hub between the Liang Zhu and belongs to the important part of the frame structure. In most earthquakes, the collapse of many buildings is attributed to the serious damage at the joint joints, while the single Liang Zhu itself is slightly damaged, which shows that the normal operation of the joints is the prerequisite to ensure the safety of the whole structure. By means of experimental study and theoretical analysis, this paper makes clear the mechanism of SRC joint force and the way of force transfer, obtains reasonable calculation model and construction measures, and provides a reliable reference for the application of SRC composite structure in engineering practice. In this paper, the SRC column-steel beam joints in many forms of SRC joints are studied. The low cycle cyclic loading tests of four joints are carried out with axial compression ratio as the main factor. In one of the specimens, X bars are arranged in the core area to find out whether they can improve the crack resistance of concrete. The experimental results show that the hysteretic curves of the four nodes are full, and there is no obvious pinch phenomenon, showing a good ductility energy dissipation capacity. The main failure form of joints is shear failure. Although the existence of axial pressure can restrain the occurrence and development of concrete cracks, the excessive axial pressure changes the shear failure of joints into bending failure at the end of beam. The initial crack load of concrete proves that X bars in the core region can delay the occurrence of cracks and effectively improve the crack resistance of concrete. According to the experimental data, the experimental values of shear force are compared with the theoretical values, and some suggestions for modifying the formula of shear bearing capacity of relevant codes are put forward. The finite element software Abaqus was used to simulate the four specimens. The results show that the experimental data are in good agreement with the theoretical values, which indicates that Abaqus is feasible in simulating the nonlinear behavior of structures and can simulate the macroscopic damage of the structures at the same time. On this basis, the four parameters of concrete strength grade, hoop ratio, stiffening rib thickness and web thickness are analyzed by finite element method, and the influence of them on the bearing capacity of joints is discussed. Through comparative analysis, it is found that increasing the thickness of web is the most direct and effective way to increase the bearing capacity of joints.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU398.9

【相似文獻】

相關(guān)期刊論文 前10條

1 曲恒緒;型鋼混凝土結(jié)構(gòu)計算方法的比較[J];安徽建筑;2003年06期

2 朱s，

本文編號：2051429