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为研究火灾高温与撞击联合作用下钢管混凝土柱的力学性能,基于ABAQUS建立了高温作用下考虑轴力影响的钢管混凝土柱侧向撞击有限元模型。首先,对高温与撞击联合作用下考虑轴力影响的钢管混凝土柱的破坏模式与受力全过程进行了分析,探讨了高温下钢管混凝土柱的抗撞性能与工作机理;其次,重点研究了受火时间、材料强度、含钢率以及撞击能量对抗撞性能的影响,并给出了相关设计建议。研究结果表明:高温与撞击联合作用下,钢管混凝土柱主要发生受弯破坏;受火15 min后,构件抗撞性能明显降低。轴压力对构件抗撞性能产生不利影响,轴压比从0增加到0.2,受火60 min构件抗撞性能下降了7.8%;混凝土强度对高温下钢管混凝土柱抗撞性能有显著影响,受火90 min后,混凝土强度由30 MPa增加到50 MPa,构件抗撞性能提高约85%;外钢管强度与含钢率对高温下抗撞性能影响不大。 相似文献
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介绍了在VISUAL BASIC环境中研华公司的ADAM-5510数据采集控制器和上位机通信实现的方法。 相似文献
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Self-Organization of Topology and Weight Dynamics on Networks from Merging and Regeneration 总被引:1,自引:0,他引:1 下载免费PDF全文
We propose a model of weighted networks in which the structural evolution is coupled with weight dynamics. Based on a simple merging and regeneration process, the model gives powel-law distributions of degree, strength and weight, as observed in many real networks. It should be emphasized that, in our model, the nontrivial degree-strength correlation can be reproduced and in agreement with empirical data. Moreover, the size-growing evolution model is also presented to meet the properties of real-world systems. 相似文献
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Being driven by an external electric field a polaron carrying both spin 1/2 and charge ±e moves at a constant speed in a polymer chain. When the polaron passes through a specific site, which couples to a magnetic impurity via spin-exchange interactions, its spin undergoes a spin-flip process if it is antiparallel to the impurity spin. Our numerical simulation shows that (a) a swap-like operation is performed between the polaron and impurity during the scattering process (b) polarons might be good candidates to be information carriers in the molecular scale. 相似文献
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该文将研究如下问题■其中,有界区域Ω■R^(n)(1≦n≦5)具有光滑边界,v表示?Ω的外法向量,且0<γ(v)∈C^(3)[0,∞).在合适的初始条件下,该文分两种情形来研究模型的全局经典解的存在性与有界性:1 相似文献
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We study the epidemic spreading of the susceptible-infected-susceptible model on small-world networks with modular structure. It is found that the epidemic threshold increases linearly with the modular strength. Furthermore, the modular structure may influence the infected density in the steady state and the spreading velocity at the beginning of propagation. Practically, the propagation can be hindered by strengthening the modular structure in the view of network topology. In addition, to reduce the probability of reconnection between modules may also help to control the propagation. 相似文献
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用红外光谱、紫外可见光谱、循环伏安法等研究了三(2,4-二特戊苯氧基)-8-喹啉氧基酞菁铜和2-十八烷基-7,7,8,8-四氰二基苯醌在Langmuir-Blodgett(LB)膜中的电荷转移。实验结果表明,在交替和混合LB膜中,酞 菁铜和C18-TC-NQ分子之间均发生了电荷转移,其中酞菁铜为给体分子,TCNQ为受体分子。在混合LB膜中,电葆转移程度较大。电导率测量表明荷移反应使LB膜的电导率较 相似文献
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Improvement of fabrication and characterization methods for micromechanical disk resonators 下载免费PDF全文
In this paper we present a novel method to fabricate reliable micro-electro-mechanical system(MEMS) disk resonators with high yield and good performance.The key breakthrough in the fabrication process is a novel approach to effectively restraining electro-chemical corrosion of polycrystalline silicon(polysilicon) electrically coupled with noble metals of MEMS devices by hydrofluoric acid(HF)-based solutions.In addition,a measurement architecture based on a differential readout topology is demonstrated.The differential circuit proposed here can effectively suppress noise and feed-through current by common-mode rejection of the differential amplifier.This differential amplifier circuit configuration is also used to build up a notch filter.The preliminary result about the temperature dependence of the resonance frequency is discussed,and the device failure is analysed. 相似文献