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INTRODUCTIONConcrete filledsteeltubesarenowwidelyusedinfactories ,powerstations,bridges ,etc .Centrifugalconcrete filledsteeltubesarehollowstructuralmemberscentrifugatedbyhigh speedcentrifuge ,andarethereforeofconsiderablylessweightthantraditionaltubes .A… 相似文献
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海洋工程中的若干力学问题 总被引:3,自引:0,他引:3
海洋开发和利用离不开海洋工程.海洋工程是以海洋科学为基础,以开发和利用海洋各种资源为目的所建造的一系列工程结构物,以及为完成这一任务所需的技术和仪器设备.近海石油开发就是海洋工程的一个方面.本文以海洋开发中的工程结构物型式为依托,从固体力学、流体力学和土力学三个方面阐述了海洋工程中的若干力学问题,提出了海洋工程中力学问题的若干优先研究内容 相似文献
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神经网络在混凝土结构可靠度评估中的应用 总被引:2,自引:0,他引:2
由于混凝土结构股役期间大量不确定因素的影响,有时难以利用确定性函数或专家系统计算结构的性能退化。本文利用有限的样本建立并训练BP神经网络,推广出混凝土结构抗力的时变规律,并应用混凝土结构时变可靠度评估中,计算简单,精度高。 相似文献
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INTRODUCTIONThetyphoonisaverydestructivestormoc curringonthetropicaloceansurfaceanddepend ingonthepotentialheatreleasedfromthemicrovaporcondensationasthemainenergysourceforitsmaintenanceanddevelopment.Typhooncanbringcalamitiesindifferentdegreestothear… 相似文献
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应用模糊神经网络综合评定混凝土强度 总被引:1,自引:0,他引:1
钻芯和回弹是两种常用的混凝土测强方法。为了充分利用这两种测强手段的特点,本文将模糊神经网络应用到混凝土强度综合评定中。由于模糊神经网络具有很强的自学习、泛化和模糊逻辑推理功能,它可以有效地映射出钻芯、回弹数据间复杂的非线性关系。通过对试验数据的仿真计算,其强度预测精度高于常规的综合方法. 相似文献
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混凝土结构耐久性环境区划标准的目的就是为混凝土结构耐久性设计提供合理的设计参数.混凝土结构耐久性环境区划标准在结构全寿命周期成本原理基础上考虑了环境对结构的影响,并将结构的重要性、结构形式和功能等多方面因素一并纳入考虑之中.首先给出了混凝土结构设计耐久性环境区划标准的概念和建立该标准的3个基本原则,其次根据自然环境条件和结构重要性等确定了区划的主要影响因素,然后以浙江省公路桥梁结构耐久性环境区划图的编制为例说明了混凝土结构耐久性环境区划的可行性与实用性,最后根据区划图给出了耐久性区划标准的若干设计规定. 相似文献
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Spallation mechanism of RC slabs under contact detonation 总被引:2,自引:0,他引:2
The spallation of the concrete slabs or walls resulting from contact detonation constitutes risk to the personnel and equipment inside the structures because of the high speed concrete fragments even though the overall structures or structural members are not destroyed completely.Correctly predicting the damage caused by any potential contact detonation can lead to better for-tification design to withstand the blast loadings.It is therefore of great significance to study the mechanism involved in the spallation of concrete slabs and walls.Existing studies on this topic of-ten employ simplified material models and 1D wave analysis,which cannot reproduce the realistic response in the spallation process.Numerical simulations are therefore carried out under different contact blast loadings in the free air using LS-DYNA.Sophisticated concrete and reinforcing bar material models are adopted,taking into account the strain rate effect on both tension and com-pression.The erosion technique is used to model the fracture and failure of materials under tensile stress.Full processes of the deformation and dynamic damage of reinforced concrete (RC) slabs and plain concrete slabs are thus observed realistically.It is noted that with the increase of quantity of explosive,the dimensions of damage crater increase and the slabs experience four different damage patterns,namely explosive crater,spalling,perforation,and punching.Comparison be-tween the simulation results of plain concrete slabs and those of RC slabs show that reinforcing bars can enhance the integrity and shearing resistance of the slabs to a certain extent,and mean-while attenuate the ejection velocity and decrease the size of the concrete fragments.Therefore,optimizing reinforcement arrangement can improve the anti-spallation capability of the slabs and walls to a certain extent. 相似文献