共查询到20条相似文献，搜索用时 62 毫秒
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双向单排配筋中高剪力墙抗震性能试验研究 总被引：5，自引：1，他引：4
双向单排配筋剪力墙结构适用于多层住宅结构。本文进行了1个普通双向双排配筋混凝土中高剪力墙、2个双向单排配筋混凝土中高剪力墙和1个带暗支撑双向单排配筋混凝土中高剪力墙的低周反复荷载试验,以研究双向单排配筋混凝土中高剪力墙的抗震性能及暗支撑对这种新型墙体结构的作用。较系统地分析了其承载力、刚度及其退化过程、延性、耗能、破坏机制和破坏特征等。试验表明,经过合理设计,这种双向单排配筋混凝土中高剪力墙可以满足多层住宅结构抗震要求。 相似文献
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双向单排配筋混凝土低矮剪力墙抗震性能试验研究 总被引：6，自引：2，他引：4
双向单排配筋混凝土低矮剪力墙适用于多层住宅结构。对4个原型的剪跨比为1.0配筋混凝土低矮剪力墙进行了低周反复荷载试验研究,包括1个双向双排配筋混凝土低矮剪力墙和3个双向单排配筋混凝土低矮剪力墙。其中1个双向单排配筋混凝土低矮剪力墙加设暗支撑,用以研究暗支撑对这种新型墙体的作用。在试验研究的基础上,对比分析了各剪力墙的刚度及其衰减过程、承载力、延性、滞回特征、耗能能力及破坏特征。试验表明,经过合理设计,这种双向单排配筋混凝土低矮剪力墙可以满足多层住宅结构抗震要求。 相似文献
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《地震工程与工程振动》2016,(4)
在高阻尼混凝土带暗支撑剪力墙研究的基础上,本文尝试在塑性区用部分高阻尼混凝土代替全部由高阻尼混凝土浇筑的剪力墙。为了进一步提高阻尼混凝土剪力墙的延性,提出了用具有超高延性高阻尼ECC在塑性区部分浇筑的剪力墙结构。为了准确把握部分高阻尼带暗支撑剪力墙的抗震性能,本文设计并完成了1片部分高阻尼带钢筋暗支撑剪力墙及1片部分高阻尼ECC带钢筋暗支撑剪力墙的低周反复加载试验,得到了2片剪力墙在低周反复荷载作用下的破坏模式、承载力、滞回曲线和耗能能力等抗震性能指标。通过与普通高阻尼混凝土带暗支撑剪力墙试验结果的对比,论证了部分高阻尼带暗支撑剪力墙的可行性,并应用有限元分析软件ABAQUS进行了数值模拟。结果表明:与高阻尼混凝土带暗支撑剪力墙相比,部分高阻尼混凝土剪力墙的承载力、延性和耗能降低不大。与部分高阻尼混凝土带暗支撑剪力墙相比,即使在较高轴压比下,部分高阻尼ECC剪力墙的承载力、刚度和耗能能力也有大幅度的提高,抗震性能得到显著改善。 相似文献
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三层单排配筋剪力墙结构抗震性能试验研究 总被引：2，自引：0，他引：2
为了对双排配筋剪力墙和单排配筋剪力墙的抗震性能进行对比研究,本文设计了1个1／3缩尺的三层混凝土剪力墙结构模型,模型的一侧墙体为双向双排配筋,另一侧墙体为双向单排配筋。对其进行了低周反复荷载下的抗震性能试验研究,分析了其承载力、延性、刚度及其退化过程、滞回特性、耗能能力和破坏特征。研究表明：在墙体的配筋率相同情况下,由于单排配筋墙体钢筋的间距相对于双排配筋墙体钢筋间距小,其首先约束混凝土裂缝的几率更大,其平面内的抗震性能优于双排配筋剪力墙;由于剪力墙的翼缘和腹板共同工作,单排配筋剪力墙平面外的性能也可满足多层剪力墙结构设计的要求。 相似文献
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《地震工程与工程振动》2017,(6)
为研究得到带暗支撑的预制叠合板剪力墙合理的竖向连接方法,分别设计了1片带钢板暗支撑的局部高阻尼混凝土U型连接预制叠合剪力墙和1片带90°钢板暗支撑的局部高阻尼混凝土预制叠合剪力墙,并设计1片普通钢板暗支撑现浇剪力墙做对比,进行了拟静力试验研究,对比三个试件在受力作用下的承载能力、滞回曲线、骨架曲线、位移延性、刚度退化、耗能性能、裂缝发展情况以及破坏形态。研究结果表明:采用U型连接的带暗支撑预制叠合板剪力墙与现浇带暗支撑剪力墙的承载能力以及抗震性能基本相近,90°暗支撑的预制叠合板剪力墙在减少钢材用量的前提下也拥有足够的承载能力和良好的抗震性能。 相似文献
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混合暗支撑高阻尼混凝土联肢剪力墙是一种新型延性双肢剪力墙,它将暗支撑引入双肢墙的两个墙肢,将内置带剪力钉钢板连梁作为剪力墙洞口连梁,墙身由高阻尼混凝土浇筑而成.本文对这种新型联肢剪力墙结构进行了低周反复加载实验与数值模拟,较系统地分析了该新型剪力墙结构的承载力、延性、耗能、破坏机制、破坏特征以及刚度衰减过程等性能.结果表明:与现有暗支撑混凝土联肢剪力墙相比,混合暗支撑高阻尼混凝土联肢剪力墙开裂强度、极限承载力、耗能能力及变形能力均有一定程度的提高,显示了良好的抗震性能;当剪力墙连梁跨高比越小,混合暗支撑高阻尼混凝土剪力墙的抗震性能越好. 相似文献
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A heat flow isoline map is presented. Low and relatively constant heat flow has been observed in the old shield areas of the East European Platform (25–40 mW/m2). Increased heat flow (>50 mW/m2) has been found in the Dniepr-Donetz depression. The area south of the East European Platform is characterized by highly variable heat flow (55–100 mW/m2). Some geophysical implications are discussed. 相似文献
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开展农村民居抗震性能调查是国家防震减灾规划的重要组成部分。本文在对辽宁省盘锦、海城、营口地区农村住宅抗震性能调查工作的基础上，从房屋的结构特点、建造年代分布、房屋的大小等方面进行了详细总结，鉴于该区域结构特点和建造年代具有很强的相关性，给出了该调查区域的农村住宅分类方法。提出基于调查中发现的进深与分类之间的相关性，利用高分辨率卫星图片判读能够在保证准确度的情况下有效降低建立农村房屋存量数据库的成本。最后，本文结合震害中农村民居砌体墙破坏模式及《镇（乡）村建筑抗震技术规程》（2008）指出了盘海营地区农村房屋在抗震方面存在的不足。 相似文献
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James R. Wait 《Pure and Applied Geophysics》1957,37(1):103-115
Summary The space between the earth and the ionosphere is considered as a wave-guide with sharply bounded walls. Employing a representation in terms of spherical wave functions of complex order, the field of a vertical dipole source is calculated for very low frequencies. It is shown that the dominant mode for 16 kc is of order one and not zero as has been commonly supposed. Good agreement is obtained with the experimental results ofJ. Heritage.Paper presented at «Colloque International sur la propagation des Ondes Radio électriques» Paris, September 1956. 相似文献
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Residuals of teleseismic P-wave arrival times at the CIPE network were used to estimate the three-dimensional velocity structure of the upper mantle by means of the inversion procedure described by Aki et al. (1977). Two models with different depth ranges (233 and 500 km, respectively) have been determined. They refer to the upper mantle beneath the Central European part of the Variscian fold-belt and its transition to the East European platform north of it. Both models reveal a lateral velocity increase within the upper mantle. It is directed to the northeast within the lithosphere and at least a part of the asthenosphere, and in a more northerly direction at greater depth. Furthermore, there seems to exist a local inhomogeneity west of Prague at a depth of some 200 km. 相似文献
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The enthalphy of the heat carrying fluids liquid water or mixture of water plus steam) which feeds the biggest Kamchatka geyser, Velican is obtained from the critical quantity of heat Qcritical, which is the net heat lost during the previous eruption and must be resupplied (stored) to trigger the next eruption. There are two unknowns in the heat balance equation for the geyser that cannot be determined from observations on the geyser in its natural state: critical and the enthalpy of the heat-carrying fluids Io. In order to obtain a system of two equations for unambiguous determination of these parameters, we made temporary physical changes that affected the natural interval between geyser eruptions and constructed the heat balance equations for the different regimes (i.e., natural and induced intervals).The changes in interval of Velican geyser were achieved by changing the area of its surface pool, using dams. For geysers with large surface pool areas, the heat loss from the surface (mainly through evaporation) is of the same order and sometimes larger than the losses from discharge of hot water. The change of surface pool area for Velican geyser from 12 m2 (in natural state) to 4.5 and 36.7 m2 in experiments leads to changes of its interval from an average of 5 hours and 35 minutes in natural state to 4 hours and 59 minutes and 8 hours and 8 minutes, respectively. From the three independent equations of heat balance we obtained three sets cf values for the enthalpy, Io and the critical energy, Qcritical, which differ from each other by less than 1%: Io= 176 kcal/kg*, Qcritical = 3.78 × 106 kcal.The interval between eruptions of Velican geyser tends to change linearly with vent area (within our experimental range). The range or interval values (the difference between maximal and minimal periods) also depends linearly on vent area. These two systematics are due to the facts that the increase of vent surface area causes increased heat loss by evaporation, and that changes of external conditions (wind velocity, atmospheric pressure, and air temperature) greatly influence the geyser interval.In order to simplify comparison of intervals of eruption of different geysers or of the 相似文献
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A M3. 4 seismic event occurred in the Punggye-ri nuclear test site,D. P. R Korea at 16∶29 p.m. on September 23,2017. We analyzed the waveforms of this event recorded by the China Earthquake Networks Center. In conclusion,this event is complex,including an explosion with a successive earthquake. Although the beginning of the event is an explosion,fault dislocation plays the main role in the event. 相似文献
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V. Privalsky T. E. Croley II 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):69-80
Many researchers use outputs from large-scale global circulation models of the atmosphere to assess hydrological and other impacts associated with climate change. However, these models cannot capture all climate variations since the physical processes are imperfectly understood and are poorly represented at smaller regional scales. This paper statistically compares model outputs from the global circulation model of the Geophysical Fluid Dynamics Laboratory to historical data for the United States' Laurentian Great Lakes and for the Emba and Ural River basins in the Commonwealth of Independent States (C.I.S.). We use maximum entropy spectral analysis to compare model and data time series, allowing us to both assess statistical predictabilities and to describe the time series in both time and frequency domains. This comparison initiates assessments of the model's representation of the real world and suggests areas of model improvement. 相似文献