共查询到18条相似文献，搜索用时 56 毫秒
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钢筋混凝土带暗柱L形柱抗震性能试验研究 总被引：4，自引：2，他引：2
提出了带暗柱的Ｌ形柱;进行了４根剪跨比λ＝３．８３３的Ｌ形柱的抗震性能试验,分析了轴压比对其抗震性能的影响;论述了暗柱设置对提高Ｌ形柱抗震能力的作用。最后,将理论结果与实测结果进行最比较,二者符合得较好 相似文献
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带交叉筋十字形短柱抗震性能试验研究 总被引：4，自引：1，他引：4
在提出带暗柱异形柱基础上，进一步提出带交叉筋异形柱这一设计方法，通过3根十字形短柱抗震性能的试验研究，分析比较了普通十字形柱，带暗柱十字形柱和带交叉筋十字形柱的性能，试验表明加配交叉钢筋可明显提高十字形短柱的抗震性能。 相似文献
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钢筋混凝土带暗柱T形柱抗震性能试验研究 总被引：2，自引：0，他引：2
提出了带暗柱的Ｔ形柱,进行了４根剪距跨比λ＝３．８３３的Ｔ形柱的地震性能试验,分析了轴压比对其抗震性能的影响,论述了暗柱的设置对提高Ｔ形柱抗震能力的作用,最后,将理论计算结果与实测结果进行了比较,二者符合得较好。 相似文献
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钢筋混凝土带暗柱十字形柱抗震性能试验研究 总被引：4，自引：0，他引：4
提出了带暗柱的十字形柱;进行了４根剪跨入λ＝３．８３３的十字形柱的抗震性能试验,分析了轴压比对其抗震性能的影响;论述了暗柱的设置对提高十字形柱抗震能力的作用。最后,将理论计算结果与实测结果进行了比较,二者符合得很好。 相似文献
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较小剪跨比带暗柱T形柱抗震性能试验研究 总被引：5，自引：0，他引：5
提出了带暗柱Ｔ形柱,进行了４根较小剪跨比的Ｔ形柱抗震性能试验,分析了轴压比对承载力,刚度,片断生的影响以及设暗柱对提高Ｔ表柱抗震能力的作用。最后进行了理论计算,计算值与实测值符合较好。 相似文献
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完成了8个1/2比例的型钢混凝土(SRC)柱在低周反复荷载作用下的试验研究.对试件塑性铰区域的弯曲变形和剪切变形进行了量测,通过量测数据计算不同变形成分对SRC柱层间位移的贡献并分析了其随加载过程的变化规律.试验研究表明,SRC柱塑性铰区的弯曲变形是引起层间位移的主要变形分量,塑性铰区的剪切变形对层间位移的贡献相对较小... 相似文献
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设置芯柱-构造柱混凝土砌块墙体抗震剪切承载力计算 总被引：8，自引：3，他引：5
本文收集了国内大量的混凝土小型空心砌块墙片试验资料,通过研究芯柱一构造柱混凝土小型空心砌块组合砌体受力特征及影响抗震剪切承载力的主要因素,结合理论计算分析,提出了抗震剪切承载力的通用计算公式。该公式既适用于芯柱-构造柱混凝土小砌块墙体,又适用于只设置芯柱或构造柱砌块墙体结构。通过试验值与计算值的比较,证明本文所提出通用公式的准确性。 相似文献
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E. R. Johnson 《地球物理与天体物理流体动力学》2013,107(2):143-164
Abstract Solutions of the steady, inviscid, non-linear equations for the conservation of potential vorticity are presented for linearly sheared geostrophic flow over a right circular cylinder. The indeterminancy introduced by the presence of closed streamline regions is removed by requiring that the steady flow retains above topography a given fraction of that fluid initially present there, assuming the flow to have been started from rest. Those solutions which retain the largest fraction in uniform and negatively sheared streams satisfy the Ingersoll (1969) criterion (that, in the limit of vanishingly small viscosity, closed streamline regions are stagnant) and so are unaffected by Ekman pumping. These flows are set up on the advection time scale. In positively sheared flows the maximum retention solutions do not satisfy the Ingersoll criterion and thus would be slowly spun down on the far longer viscous spin-up time. For arbitrary isolated topography, both the partial retention and Ingersoll problems are reduced to a one-dimensional non-linear integral equation and the solution of the Ingersoll problem obtained in the limit of strong positive shear. The stagnant region is symmetric about the zero velocity line and extends to infinity in the streamwise direction. Its cross-stream width is proportional to the rotation rate and fractional height occupied by the obstacle and inversely proportional to the strength of the shear, decreasing inversely as the square of distance upstream and downstream. 相似文献
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《Advances in water resources》2001,24(7):803-819
Alcohol flooding, consisting of injection of a mixture of alcohol and water, is one source removal technology for dense non-aqueous phase liquids (DNAPLs) currently under investigation. An existing compositional multiphase flow simulator (UTCHEM) was adapted to accurately represent the equilibrium phase behavior of ternary and quaternary alcohol/DNAPL systems. Simulator predictions were compared to laboratory column experiments and the results are presented here. It was found that several experiments involved unstable displacements of the NAPL bank by the alcohol flood or of the alcohol flood by the following water flood. Unstable displacement led to additional mixing compared to ideal displacement. This mixing was approximated by a large dispersion in one-dimensional simulations and or by including permeability heterogeneities on a very small scale in three-dimensional simulations. Three-dimensional simulations provided the best match. Simulations of unstable displacements require either high-resolution grids, or need to consider the mixing of fluids in a different manner to capture the resulting effects on NAPL recovery. 相似文献
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This paper presents a numerical investigation on the seismic response of multidrum classical columns. The motivation for this study originates from the need to understand: (a) the level of ground shaking that classical multidrum columns can survive, and (b) the possible advantages or disadvantages of retrofitting multidrum columns with metallic shear links that replace the wooden poles that were installed in ancient times. The numerical study presented in this paper is conducted with the commercially available software Working Model 2D?, which can capture with fidelity the sliding, rocking, and slide‐rocking response of rigid‐body assemblies. This paper validates the software Working Model by comparing selected computed responses with scarce analytical solutions and the results from in‐house numerical codes initially developed at the University of California, Berkeley, to study the seismic response of electrical transformers and heavy laboratory equipment. The study reveals that relative sliding between drums happens even when the g‐value of the ground acceleration is less than the coefficient of friction, µ, of the sliding interfaces and concludes that: (a) typical multidrum classical columns can survive the ground shaking from strong ground motions recorded near the causative faults of earthquakes with magnitudes Mw=6.0–7.4; (b) in most cases multidrum classical columns free to dislocate at the drum interfaces exhibit more controlled seismic response than the monolithic columns with same size and slenderness; (c) the shear strength of the wooden poles has a marginal effect on the sliding response of the drums; and (d) stiff metallic shear links in‐between column drums may have an undesirable role on the seismic stability of classical columns and should be avoided. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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Y. Lu E. Vintzileou G. -F. Zhang T. P. Tassios 《Soil Dynamics and Earthquake Engineering》1999,18(2):709
In the area of reduced-scale model testing, increasing the size of model structures as a means of improving the model performance is often inhibited by the capacity limitation of the available seismic testing facilities. This was the case in a recent experimental programme conducted at NTUA in which several 1:5.5-scale model frames were tested on an earthquake simulator. In order to improve the model reliability, the following measures were taken: strictly obeying the geometric scaling in almost all aspects; using deformed bars as model reinforcement; and using stone-aggregate microconcrete for constructing the models, etc. To evaluate the effectiveness of these measures, a parallel column test programme was conducted in which duplicates of typical columns in the test model frames were prepared, along with those of large sizes following similitude laws. The column specimens were tested under reversals of lateral load. Besides the scale effects, general rules regarding the influences of transverse confinement and axial force on the ductility and strength of columns were also confirmed on the small-scale model columns. 相似文献