郑颖人, 王乐, 孔亮, 阿比尔的. 钢材破坏条件与极限分析法在钢结构中应用探索[J]. 工程力学, 2018, 35(1): 55-65. DOI: 10.6052/j.issn.1000-4750.2017.05.ST14
引用本文: 郑颖人, 王乐, 孔亮, 阿比尔的. 钢材破坏条件与极限分析法在钢结构中应用探索[J]. 工程力学, 2018, 35(1): 55-65. DOI: 10.6052/j.issn.1000-4750.2017.05.ST14
ZHENG Ying-ren, WANG Le, KONG Liang, ABI Erdi. STEEL DAMAGE CONDITION AND APPLICATION OF ULTIMATE ANALYSIS METHOD IN STEEL STRUCTURES[J]. Engineering Mechanics, 2018, 35(1): 55-65. DOI: 10.6052/j.issn.1000-4750.2017.05.ST14
Citation: ZHENG Ying-ren, WANG Le, KONG Liang, ABI Erdi. STEEL DAMAGE CONDITION AND APPLICATION OF ULTIMATE ANALYSIS METHOD IN STEEL STRUCTURES[J]. Engineering Mechanics, 2018, 35(1): 55-65. DOI: 10.6052/j.issn.1000-4750.2017.05.ST14

钢材破坏条件与极限分析法在钢结构中应用探索

STEEL DAMAGE CONDITION AND APPLICATION OF ULTIMATE ANALYSIS METHOD IN STEEL STRUCTURES

  • 摘要: 该文基于极限应变点破坏的概念提出了钢材的破坏条件,给出了破坏函数与破坏曲面。利用FLAC3D软件以钢简支梁为例,尝试将数值极限分析方法中极限应变法应用到钢结构。该方法利用数值极限分析法求取材料的极限应变,将其作为材料点破坏判据。无论受拉或受压均视钢材为弹塑性材料,钢材达到屈服荷载下的弹性极限应变为屈服,达到弹塑性极限应变为破坏。首先对钢梁材料进行直拉试验,得到钢材的力学参数,进而用数值极限方法求得该钢材的极限应变值,然后对简支钢梁进行纯弯试验直至破坏,用FLAC3D模拟该试验过程,最后将数值计算结果跟实验结果进行对比验证,结果显示钢梁的破坏形态,极限承载力都吻合较好,初步证明极限应变法可用于钢结构,并对基于极限应变的钢梁破坏标准与现行规范破坏标准进行了比较。

     

    Abstract: In this paper, the failure condition of steel is proposed based on the concept of ultimate strain point failure, and the failure function and damage surface are given. Taking a simply supported steel beam as an example, this paper attempted to apply the ultimate strain method of the numerical limit analysis to steel structures by using FLAC3D software. In the method, the numerical limit analysis was adopted to solve the ultimate strain of materials and regard it as the failure criterion for material points. For both tension and compression, the steel is regarded as an ideal elastic-plastic material. The steel shall yield when it reaches the elastic ultimate strain under the yield load, and shall break under the elastic-plastic ultimate strain. First of all, a direct pulling test was conducted on direct-pulling steel test pieces whose material is the same with the steel beam to obtain the mechanical parameters of the steel material. Furthermore, the numerical limit analysis method was used to determine the ultimate strain of the steel material. Afterwards, a pure bending test was carried out on the simply supported steel beam until it is destroyed. FLAC3D was utilized to simulate the test process. The numerical calculation results were compared with the test results. The results showed satisfying consistence in the failure mode and ultimate load-bearing capacity of the steel beam. It proved that the ultimate strain method can be applied to steel structures and further studies on complicated structures can be conducted. The failure standard of the steel beam based on the ultimate strain is compared with the current specification failure standard.

     

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