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Numerical Modeling of Response and Damage of Masonry Walls to Blast Loading

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Transactions of Tianjin University 2006年第B9期12卷 132-137页

作者： deeks andrew School of Civil and Resource Engineering The University of Western AustraliaAustralia

To model the damage process of masonry walls under blast loading, a dynamic continuum damage material model is constructed for brick and mortar separately. The degradation of both the stiffness and strength are governed by a damage variable. By using the proposed material model, damage and fragmentation of a typical masonry wall under blast loading at different scaled distances is calculated. The hazard level of the masonry wall to blast loading is evaluated by analyzing the numerical results.

关键词： masonry blast loading fragmentation hazard level damage numerical modeling

Numerical Simulations of the Performance of Steel Guardrails Under Vehicle Impact

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Transactions of Tianjin University 2008年第5期14卷 318-323页

作者： HAO Hong deeks J andrew WU Chengqing School of Civil and Resource Engineering the University of Western Australia 35 Stirling Highway Crawley WA 6009 Australia School of Civil Environmental and Mining Engineering the University of Adelaide North Terrace SA5005 Australia

Road side barriers are constructed to protect passengers and contain vehicles when a vehicle crashes into a barrier. In general, full-scale crash testing needs to be carried out if a geometrically and structurally equivalent barrier has not previously been proven to meet the requirements of containing the vehicle and dissipating sufficient impact energy for passenger protection. As full-scale crash testing is very expensive, the number of data that can be measured in a test is usually limited, and it may not always be possible to obtain good quality measurements in such a test, a reliable and efficient numerical simulation of crash testing is therefore very useful. This paper presents finite element simulations of a 3-rail steel road traffic barrier under vehicle impact. The performance levels defined in Australian Standards AS5100 Clause 10.5 for these barriers are checked. The numerical simulations show that the barrier is able to meet low performance levels. However, the maximum deceleration is higher than the acceptable limit for passenger protection. If present, a kerb launches the vehicles into the barrier, allowing for the possibility of overriding the barrier under certain circumstances, but it redirects the vehicle and reduces the incident angle, which reduces impact force on the barrier. Further investigation into all common kerb profiles on roads should be carried out, as only one kerb profile is investigated in this study.

关键词： vehicle impact steel barrier kerb performance level vehicle containment passenger protection

基于SBFEM和并行计算的旋转周期结构二维弹性问题数值求解

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基于SBFEM和并行计算的旋转周期结构二维弹性问题数值求解

中国力学大会——2013

作者：李根何宜谦杨海天 andrew deeks 大连理工大学工程力学系 School of Engineering and Computing Sciences Durham University

将比例边界有限元法(SBFEM)、群论方法和并行计算结合,发展一种新的求解旋转周期结构弹性力学问题的数值方法。通过在空间上利用SBFEM建模,提供一种半解析的数值方法,避免了内部网格和节点的使用,并能准确地描述应力奇异性问题;同时,根...

将比例边界有限元法(SBFEM)、群论方法和并行计算结合,发展一种新的求解旋转周期结构弹性力学问题的数值方法。通过在空间上利用SBFEM建模,提供一种半解析的数值方法,避免了内部网格和节点的使用,并能准确地描述应力奇异性问题;同时,根据结构旋转周期的特点,利用群论理论,将整体问题转化为一系列独立子问题

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安全高效熏蒸助力节粮减损

粮油食品科技 2024年第3期32卷 I0006-I0007页

作者：安德鲁·迪克斯西蒙·麦科迪澳大利亚默多克大学

澳大利亚默多克大学始建于1973年,主校区位于澳大利亚西澳州首府珀斯,学校占地227公顷,澳大利亚的特色植物将校园点缀得格外漂亮,是一所门类齐全的综合研究型大学,共有2.4万名在校学生。在迪拜、新加坡和马来西亚设有分校区,81%的教师... 详细信息

澳大利亚默多克大学始建于1973年,主校区位于澳大利亚西澳州首府珀斯,学校占地227公顷,澳大利亚的特色植物将校园点缀得格外漂亮,是一所门类齐全的综合研究型大学,共有2.4万名在校学生。在迪拜、新加坡和马来西亚设有分校区,81%的教师拥有博士学位。它以一流的教学和科研工作在世界上享有较高的知名度。默多克大学还是唯一一所连续五年获得五星级毕业满意度的院校,这是澳大利亚其它大学所无法比拟的。

关键词：默多克博士学位分校区一所澳大利亚特色植物教学和科研满意度

澳洲500N钢筋与混凝土受拉黏结滑移模型研究

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建筑材料学报 2012年第3期15卷 322-326,333页

作者：李海涛 andrew John deeks 苏小卒南京林业大学建筑工程系江苏南京210037 School of Engineering and Computing Science Durham UniversityDurhamEngland DH13LE 同济大学建筑工程系上海200092

为了研究澳洲500N钢筋与混凝土的受拉黏结滑移关系,采用分辨率较高的激光位移传感器,对一批短锚长试件进行了系列拔出试验研究,得到精确度较高的黏结滑移值及完整的试验黏结滑移关系曲线,详细描述了澳洲500N钢筋在混凝土中的受拉黏结滑... 详细信息

为了研究澳洲500N钢筋与混凝土的受拉黏结滑移关系,采用分辨率较高的激光位移传感器,对一批短锚长试件进行了系列拔出试验研究,得到精确度较高的黏结滑移值及完整的试验黏结滑移关系曲线,详细描述了澳洲500N钢筋在混凝土中的受拉黏结滑移破坏全过程:弹性阶段、局部滑移阶段、滑移上升段、滑移下降段和残余段.在对试验得到的较短锚长构件拔出试验结果分析的基础之上,经统计回归和分析,提出了澳洲500N钢筋与混凝土的受拉黏结滑移连续型曲线模型,并和试验结果做了对比.

关键词： 500N高强钢筋拔出试验黏结滑移模型

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保护层厚度对受拉与受压粘结强度的影响

华中科技大学学报（自然科学版） 2012年第5期40卷 80-83页

作者：李海涛 andrew J deeks 苏小卒黄东升南京林业大学土木工程学院江苏南京210037 杜伦大学计算机科学与工程学院同济大学建筑工程系上海200092

针对不同混凝土保护层厚度,分别进行了12个拔出试验和18个推出试验,并对试验结果进行了对比与分析.结果表明:当保护层厚度较小时,无论是拔出试件还是推出试件,均发生劈裂破坏;当保护层厚度较大时,推出试件钢筋被缓缓推出,混凝土没有开裂... 详细信息

针对不同混凝土保护层厚度,分别进行了12个拔出试验和18个推出试验,并对试验结果进行了对比与分析.结果表明:当保护层厚度较小时,无论是拔出试件还是推出试件,均发生劈裂破坏;当保护层厚度较大时,推出试件钢筋被缓缓推出,混凝土没有开裂;增加混凝土保护层厚度既可以提高钢筋的受拉粘结强度,也可以提高钢筋的受压粘结强度;混凝土保护层厚度在一定限值范围内对钢筋受拉粘结强度影响较大.

关键词：混凝土保护层厚度拔出试验推出试验粘结强度极限荷载

Scaled Boundary Methods: Advantages for Elastostatics

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Scaled Boundary Methods: Advantages for Elastostatics

Moment transfer factors for column-supported cast-in-situ hollow core slabs

The Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational Mechanics

作者： andrew J.deeks School of Civil & Resource Engineering The University of Western Australia 35 Stirling Highway Crawley WA 6009 Australia

The scaled boundary finite element method, a semi-analytical method of computational mechanics combining advantages of the f'mite element method with advantages of the boundary element method, was originally developed by Wolf and Song for the analysis of dynamic unbounded problems. This paper reviews recent advances in the scaled boundary method and its application to elastostatic problems made by the author and his co-workers. Advances include a virtual work formulation of the method, stress recovery, error estimation and adaptive procedures, direct comparisons of computational efficiency with the finite element method, prescribed displacement procedures, variation of material properties with depth, and meshless and higher order approaches. Applications in geomechanics and fracture mechanics are addressed.

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第3期13卷 165-173页

作者： Hai-tao LI andrew John deeks Li-xin LIU Dong—shengHUANG Xiao-zu SU Department of Building Engineering Nanj ing Forestry University Nanj ing 210037 China Faculty of Science Durham University Durham DH1 3LE England Department of Civil Engineering Zhengzhou University Zhengzhou 450002 China Department of Building Engineering Tongji University Shanghai 200092 China

Hollow core slabs are becoming of increasing interest as the construction industry attempts to minimise the impact of its activities on the environment. By forming voids in the interior of a concrete slab, the amount of concrete used can be reduced without significantly altering the capacity of the structure. In this study, we examined the inner force transfer mechanism of a column-supported cast-in-situ hollow core slab using finite element analysis. Both a hollow core slab and the corresponding solid slab were analysed using ANSYS and the results were compared. The orientation of the tube fillers causes the stiffness of the hollow slab to be orthotropic, potentially changing the distribution of load carried in the two orthogonal directions. Both the cross-section’s moments in the column strip and near the columns in the hollow core slab become larger than that in the solid floor. As well, the cross-section’s stiffness along the tube arrangement direction is larger than that of the radial cross-section, which causes the direction along the hole of the hollow core slab to carry more moment than the radial direction. The conversion factors of the two directions are proposed from the comparison for four typical areas of the hollow core slab, as are the moment distribution coefficients.

关键词： Reinforced concrete Cast-in-situ Hollow core slab Tube filler Finite element analysis

An Element-free Galerkin Scaled Boundary Method for Stress Intensity Factors and Higher Order Terms

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An Element-free Galerkin Scaled Boundary Method for Stress I...