夏敏, 余江滔, 陆洲导. 受火后混凝土框架基于纤维模型的软件开发与试验验证[J]. 工程力学, 2016, 33(11): 163-173. DOI: 10.6052/j.issn.1000-4750.2015.04.0264
引用本文: 夏敏, 余江滔, 陆洲导. 受火后混凝土框架基于纤维模型的软件开发与试验验证[J]. 工程力学, 2016, 33(11): 163-173. DOI: 10.6052/j.issn.1000-4750.2015.04.0264
XIA Min, YU Jiang-tao, LU Zhou-dao. SOFTWARE DEVELOPMENT AND EXPERIMENTAL VERIFICATION ON REINFORCED CONCRETE FRAME AFTER FIRE BASED ON FIBER ELEMENT[J]. Engineering Mechanics, 2016, 33(11): 163-173. DOI: 10.6052/j.issn.1000-4750.2015.04.0264
Citation: XIA Min, YU Jiang-tao, LU Zhou-dao. SOFTWARE DEVELOPMENT AND EXPERIMENTAL VERIFICATION ON REINFORCED CONCRETE FRAME AFTER FIRE BASED ON FIBER ELEMENT[J]. Engineering Mechanics, 2016, 33(11): 163-173. DOI: 10.6052/j.issn.1000-4750.2015.04.0264

受火后混凝土框架基于纤维模型的软件开发与试验验证

SOFTWARE DEVELOPMENT AND EXPERIMENTAL VERIFICATION ON REINFORCED CONCRETE FRAME AFTER FIRE BASED ON FIBER ELEMENT

  • 摘要: 为了对受火后混凝土框架的残余力学性能进行有效准确的数值模拟,该文基于纤维单元模型和分层壳单元模型的思路,以ABAQUS通用有限元软件为开发平台,利用Python脚本语言对其进行二次开发,建立了混凝土框架火灾受损分析系统(简称ASFCF系统)。为了验证该系统,设计了2个相同尺寸的带楼板的单层单跨空间混凝土框架,一个进行火灾试验(称为火后框架),一个不进行火灾试验(称为常温框架),对这两个框架中的各个梁、板构件按顺序依次进行静载破坏试验;利用ASFCF系统对两个框架分别进行非线性有限元分析,将火后框架与常温框架各个构件的模拟计算结果与试验实测数据进行对比,结果表明:二者的吻合度较高,误差均在可接受的范围之内,说明采用纤维单元模型和分层壳单元模型模拟火灾后框架结构中的梁、柱和楼板是合理有效的,采用ASFCF系统对混凝土框架进行高温后热力耦合分析的计算结果准确、可信,能够较好地用于受火后混凝土框架残余承载力的计算和评估中。

     

    Abstract: Based on the principle of a fiber element model and a layered shell element model, the secondary development is executed with the scripting language of Python on the platform of ABAQUS software and the Analytical System of a Fire-damaged Concrete Frame (hereafter referred to as the system of ASFCF) is established for the purpose of accurately simulating the residual mechanical properties of the reinforced concrete frame after fire. In order to validate the system of ASFCF, two identical size, single-story and single-span spatial reinforced concrete frames with the floor are designed, one will be burned in fire and the other will not be fired. Then, the test of the beams and slabs of these two frames will be conducted under monotonic loading in order. Nonlinear finite element analyses for the two test specimens are carried out by the system of ASFCF. The results show that the simulation agrees well with the test. It indicates that the fiber element model and the layered shell element model can be used to simulate the beams (columns) and slabs of the reinforced concrete frame after fire, respectively. The thermo-mechanical coupled analysis results of the reinforced concrete frame after fire by use of the system of ASFCF are precise and reliable, and the system of ASFCF can be well utilized to calculate and evaluate the residual bearing capacity of the reinforced concrete frame after fire.

     

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