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师燕超 , 张浩 , 李忠献 . 钢筋混凝土梁式构件抗爆分析的改进等效单自由度方法 [J ] . 建筑结构学报 , 2019 , 40 ( 10 ): 8 - 16 .

SHI Y C , ZHANG H , LI Z X . Improved equivalent single degree of freedom method for blast analysis of RC beams [J ] . Journal of Building Structures , 2019 . 40 ( 10 ): 8 - 16 . (in Chinese) DOI: 10.14006/j.jzjgxb.2019.0096 http://doi.org/10.14006/j.jzjgxb.2019.0096 RC beams may be damaged with different failure modes subjected to blast loads. The possible damage modes include flexural failure, direct shear failure, combination of diagonal shear and flexural failure. A dynamic analysis method of structural components under blast loads mainly considers the flexural failure mode and ignores direct shear failure and combination of diagonal shear and flexural failure. Therefore, a quick and accurate blast analysis method for different failure modes is still lacking. In this paper, based on an equivalent single degree of freedom (SDOF) model theory,equivalent SDOF models considering direct shear failure and combination of diagonal shear and flexural failure for RC beams are improved, and the failure criteria and calculation method for the dynamic response of RC beams exhibiting both the direct shear failure and combination of diagonal shear and flexural failure are proposed. Furthermore, considering the combined failure modes, an improved equivalent SDOF method for blast analysis of RC beams is proposed. The procedure for blast analysis of RC beams based on the improved equivalent SDOF method is also presented. The improved method can directly evaluate the failure modes of RC beams under blast loading and calculate structural dynamic responses. Different failure modes and dynamic responses of RC beams under different blast loads are simulated based on software LS-DYNA. The comparison between the simulated results and results calculated from the improved equivalent SDOF method proves that the proposed equivalent SDOF method is valid.

阎石 , 张亮 , 王丹 . 钢筋混凝土板在爆炸荷载作用下的破坏模式分析 [J ] . 沈阳建筑大学学报(自然科学版) , 2005 , 21 ( 3 ): 177 - 180 .

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汪维 , 刘瑞朝 , 吴飚 , 等 . 爆炸荷载作用下钢筋混凝土梁毁伤判据研究 [J ] . 兵工学报 , 2016 , 37 ( 8 ): 1421 - 1429 . DOI: 10.3969/j.issn.1000-1093.2016.08.012 http://doi.org/10.3969/j.issn.1000-1093.2016.08.012 为研究钢筋混凝土梁在爆炸波作用下的毁伤判据，对两种尺寸的钢筋混凝土梁在缩比条件下进行了不同爆炸距离作用和装药量下的试验研究。试验中以高层和框架结构中最常见的两种 梁为研究对象，通过11次独立的爆炸试验，观测了钢筋混凝土梁在不同装药量下的破坏模式和破坏特征。研究结果表明：钢筋混凝土梁在近区爆炸荷载作用下，在同一爆高下，随着装药量的增加，梁的破坏程度逐渐增加，破坏模式由迎爆面中心两侧少量混凝土脱落和背爆面少量断裂裂纹逐渐增加为迎爆面倒三角锥形式混凝土压碎弯曲破坏，背爆面出现三角锥裂纹和背爆面少量混凝土脱落破坏，最终迎爆面和背爆面三角锥破坏区域贯通形成中心区域压碎崩塌弯曲破坏；崩塌区域的尺寸随着装药量增加而逐渐增加。近区爆炸（以爆距0.5 m为例）作用下，试验钢筋混凝土梁的毁伤判据为：当比例爆高Z>0.4 m/kg^1/3 时，梁遭受到轻微破坏；当比例爆高0.3 m/kg^1/31/3</sup> 时，梁遭受到中等破坏；当比例爆高0.28 m/kg^1/31/3</sup>时，混凝土梁遭受重度破坏；当比例爆高Z1/3</sup>，梁遭受严重破坏。在近区爆炸作用下，钢筋混凝土梁的破坏不仅依赖于爆炸比例距离，还与爆高有关，同一比例距离下爆高越大，梁试件的破坏越严重。研究结果可为工程应用及毁伤评估提供参考。

WANG W , LIU R C , WU B , et al. Damage criteria of reinforced concrete beams under blast loading [J ] . Acta Armamentarii , 2016 , 37 ( 8 ): 1421 - 1429 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2016.08.012 http://doi.org/10.3969/j.issn.1000-1093.2016.08.012 In order to investigate the damage criteria of reinforced concrete (RC) beams under blast loading, the experimental study of two different dimensions of RC beams under different blast distances and charge masses is carried out. Two common RC beams designed for tall buildings and frame structures are taken as the research objects. The damage mode and characteristics of RC beams are got through 11 independent blast experiments. The results show that, when RC beams are subjected to close-in blast loading, the damage level increases with the increase in explosive mass at the same blast distance, the damage mode of RC beams changes from a few fall-off of concrete on the two sides of upper side and a few ruptures on the rear face to the compressed flexural damage of reverse triangle cone-shaped concrete on the upper side and triangle cone-shaped crack and a fall-off of concrete on the rear face, and finally the triangle cone-shaped damage areas on both upper side and rear face are perforated to result in a crushed and punched damage of concrete in the middle area. The damage area increases with the increase in explosive mass. Under close-in blast loading (blast distance= 0.5 m for example), the damage criteria of the RC beams used in the experiment are: the beam suffers from minor damage for scaled burst distance Z>0.4 m/kg^1/3; it suffers from moderate damage for scaled burst distance 0.3 m/kg^1/3<Z<0.4 m/kg^1/3; it suffers from high damage for scaled burst distance 0.28 m/kg^1/3<Z<0.3 m/kg^1/3; it suffers from serious damage for scaled burst distance Z<0.28 m/kg^1/3. It is also found that the damage of RC beam not only depends on the scaled burst distance under close-in blast loading, but also depends on the burst distance. At the same scaled burst distance, the more the burst distance is, the damage of RC beam is more serious. The results can be useful for engineering application and damage assessments.

周游 , 纪冲 , 王雷元 , 等 . 重复爆炸载荷作用下薄壁方管动力响应研究 [J ] . 兵工学报 , 2019 , 40 ( 9 ): 1871 - 1880 . DOI: 10.3969/j.issn.1000-1093.2019.09.012 http://doi.org/10.3969/j.issn.1000-1093.2019.09.012 薄壁方管作为一种典型工程构件，在建筑、海洋、航天等领域应用广泛，其结构面临遭受重复爆炸的风险，开展薄壁方管在重复爆炸载荷作用下的动力响应研究具有重要现实意义。采用实验与数值模拟相结合的方法，对比分析了薄壁方管在单次和重复爆炸载荷作用下的动力响应。将壁厚4 mm、横截面边长100 mm的薄壁方管置于爆炸场中进行冲击实验，并利用非线性动力有限元程序LS-DYNA完全重启动功能及流体与固体耦合算法，对薄壁方管在单次爆炸和重复爆炸载荷下的非线性动力响应过程进行三维数值模拟；描述了方管在不同爆炸次数下的动力响应及损伤变形，给出了一种通过损伤因子反映爆炸载荷作用后材料损伤劣化的数值计算方法。研究结果表明：方管在重复爆炸作用下的变形会产生损伤积累；相同爆炸载荷作用下已变形损伤的方管相对无损方管其有效应变增量更大，在迎爆点周围区域、侧边以及塑性铰位置，前者有效应变增量达到了后者的2.47～3.88倍，容易引起方管更严重的毁伤；两侧边是方管较脆弱的区域，极易因应力集中产生较大的塑性应变，需要特别加强防护。

ZHOU Y , JI C , WANG L Y , et al. Research on the dynamic response of thin-walled square tube under repeated blast loads [J ] . Acta Armamentarii , 2019 , 40 ( 9 ): 1871 - 1880 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2019.09.012 http://doi.org/10.3969/j.issn.1000-1093.2019.09.012 As a typical engineering component, thin-walled square tube is widely used in construction, ocean and aerospace fields. Its structure may be subjected to the repeated blast loads. It is of practical significance to the research on dynamic response of thin-walled square tube under repeated blast loads. Experimental and numerical investigations were carried out on the dynamic response of thin-walled steel square tubes subjected to single and repeated blasting loads. The impact experiments of thin-walled square tube with 4 mm in wall thickness and 100 mm in cross-section width were made in the explosion field. Based on the full restart function of LS-DYNA and Euler-Lagrange coupling method, the dynamic responses of square tubes subjected to single or repeated blast loads laterally are numerically simulated, and the damage effects under different explosion numbers are described．A numerical method is proposed to reflect the material damage after blast load by damage factor. The results show that the deformation of square tubes subjected to repeated blast loads causes a damage accumulation. Under the same blast load, the deformed square tube has bigger effective strain increment than that of undamaged square tube. In the area around the mid-point, the sides and the plastic hinge position of square tube, the effective strain increment of the former is 2.47-3.88 times of the latter, which may cause the square tube to be damaged more seriously. The two sides of square tube are the weak areas, so it is easy to produce large plastic strain due to stress concentration, and a special protection is needed. Key

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