GFRP筋混凝土梁耐火性能計算方法
發(fā)布時間：2019-08-07 09:47
【摘要】：通過GFRP筋混凝土梁耐火性能的理論分析與有限元計算,提出GFRP筋混凝土結(jié)構(gòu)耐火性能的計算方法。在合理選擇GFRP和混凝土材料的熱工參數(shù)、高溫力學參數(shù)的基礎(chǔ)上,采用有限元分析軟件ABAQUS建立三面受火的GFRP筋混凝土梁的高溫熱力學模型。經(jīng)與GFRP筋混凝土梁火災(zāi)試驗結(jié)果的對比驗證,該高溫力學模型具有較高的精確性。對影響GFRP筋混凝土梁高溫力學性能的各參數(shù)進行有限元分析,結(jié)果表明,影響梁耐火性能的主要因素為梁上作用的荷載比、GFRP筋在混凝土截面的位置和受火時間。參考歐洲規(guī)范鋼筋混凝土抗火性能的設(shè)計方法,提出GFRP筋混凝土構(gòu)件基于力學性能的耐火設(shè)計公式。通過混凝土500℃等溫線簡化受火面積和GFRP筋高溫強度等效換算的方式,將火災(zāi)下截面的非均勻材料力學性質(zhì)轉(zhuǎn)變?yōu)殡S受火時間變化的均勻材料,提出了不同受火時刻GFRP筋混凝土受彎構(gòu)件的承載力計算式。經(jīng)與有限元分析結(jié)果的對比,該計算方法精度較高,可應(yīng)用于評估不同受火時刻下GFRP筋混凝土的高溫承載力。
[Abstract]:Through the theoretical analysis and finite element calculation of the fire resistance of the GFRP reinforced concrete beam, the calculation method of the fire resistance of the GFRP reinforced concrete structure is proposed. On the basis of reasonable selection of thermal parameters and high-temperature mechanical parameters of GFRP and concrete materials, a high-temperature thermodynamic model of GFRP reinforced concrete beams with three-side fire is established by using the finite element analysis software ABAQUS. The results of the fire test of GFRP reinforced concrete beam show that the high-temperature mechanical model has high accuracy. The finite element analysis of the parameters of the high-temperature mechanical properties of the GFRP-reinforced concrete beam is carried out. The results show that the main factors that influence the fire-resistance of the beam are the load ratio of the beam, the position of the GFRP bar in the section of the concrete and the time of fire. With reference to the design method of the fire resistance of reinforced concrete in Europe, a fire-resistant design formula based on the mechanical property of the GFRP reinforced concrete component is proposed. In this paper, the non-uniform mechanical properties of the cross-section of the fire are changed into the uniform material with the change of the fire time by the method of simplifying the equivalent conversion of the heat-receiving area and the high-temperature strength of the GFRP rib through the 500-degree-C isotherm of the concrete, and the bearing capacity calculation formula of the GFRP-reinforced concrete flexural member at different fire-receiving time is proposed. Compared with the finite element analysis, the method has high precision and can be used to evaluate the high-temperature bearing capacity of GFRP rib concrete at different fire-receiving time.
【作者單位】： 哈爾濱工業(yè)大學深圳研究生院;深圳市建筑科學研究院有限公司;
【基金】：亞熱帶建筑科學國家重點實驗室開放基金項目(2009KB20)
【分類號】：TU377
[Abstract]:Through the theoretical analysis and finite element calculation of the fire resistance of the GFRP reinforced concrete beam, the calculation method of the fire resistance of the GFRP reinforced concrete structure is proposed. On the basis of reasonable selection of thermal parameters and high-temperature mechanical parameters of GFRP and concrete materials, a high-temperature thermodynamic model of GFRP reinforced concrete beams with three-side fire is established by using the finite element analysis software ABAQUS. The results of the fire test of GFRP reinforced concrete beam show that the high-temperature mechanical model has high accuracy. The finite element analysis of the parameters of the high-temperature mechanical properties of the GFRP-reinforced concrete beam is carried out. The results show that the main factors that influence the fire-resistance of the beam are the load ratio of the beam, the position of the GFRP bar in the section of the concrete and the time of fire. With reference to the design method of the fire resistance of reinforced concrete in Europe, a fire-resistant design formula based on the mechanical property of the GFRP reinforced concrete component is proposed. In this paper, the non-uniform mechanical properties of the cross-section of the fire are changed into the uniform material with the change of the fire time by the method of simplifying the equivalent conversion of the heat-receiving area and the high-temperature strength of the GFRP rib through the 500-degree-C isotherm of the concrete, and the bearing capacity calculation formula of the GFRP-reinforced concrete flexural member at different fire-receiving time is proposed. Compared with the finite element analysis, the method has high precision and can be used to evaluate the high-temperature bearing capacity of GFRP rib concrete at different fire-receiving time.
【作者單位】： 哈爾濱工業(yè)大學深圳研究生院;深圳市建筑科學研究院有限公司;
【基金】：亞熱帶建筑科學國家重點實驗室開放基金項目(2009KB20)
【分類號】：TU377
【參考文獻】
相關(guān)期刊論文 前5條
1 查曉雄;王曉璐;謝先義;;GFRP筋混凝土梁耐火性能的試驗研究[J];防災(zāi)減災(zāi)工程學報;2012年01期
2 王曉璐;g，
本文編號：2523874
本文鏈接：http://www.sikaile.net/kejilunwen/sgjslw/2523874.html
