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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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在试验研究基础上，提出了钢筋混凝土Ｌ形柱非线性分析的有关假定。以该假定为基础所计算的“Ｍ－φ”曲线与实测结果接近。 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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较小剪跨比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
提出了带暗柱十字形柱,进行了４根较小剪跨比的十字形柱抗震性能试验,分析了轴压比对承载力,刚度,延性的影响,以及设暗柱对提高十字形柱抗震能力的作用,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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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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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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若干研究已表明设置暗柱能有效提高T形柱的延性,但迄今为止带暗柱T形柱轴压比限值的研究尚为空白,这影响了带暗柱T形柱的工程应用。文中采用非线性全过程数值计算方法,计算了不同肢长、不同抗震等级下带暗柱与不带暗柱钢筋混凝土等肢T形柱在不同纵向受力钢筋配筋率和不同体积配箍率时的截面曲率延性比;根据《混凝土异形柱结构技术规程》(JGJ149-2006)给出的各抗震等级下对异形柱截面曲率延性比的要求,确定了带暗柱与不带暗柱的等肢T形柱的轴压比限值,进而求出两者同一肢长下轴压比限值的比值;最后通过回归分析得到了带暗柱等肢T形柱轴压比限值的调整系数公式。利用此公式并根据《规程》JGJ149-2006中规定的不带暗柱T形柱的轴压比限值即可求出带暗柱等肢T形柱的轴压比限值。 相似文献
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J. Urrutia-Fucugauchi 《Bulletin of Volcanology》1982,45(1):1-8
Anisotrophy of magnetic susceptibility (AMS) results from 27 specimens drilled from the top and two sides of a single columnar basalt segment are presented. The magnetic foliation plane is nearly horizontal for all parts of the column, which is consistent with a primary magma flow pattern, without evidence of local convection or differentiative processes. The shape of AMS ellipsoids is however predominantly prolate, which may be indicative of increased magnetic grain elongation due to crystal growth or grain realignment normal to a vertical stress field (due to thermal contraction). Apparent systematic variations related to column shape are found in bulk susceptibility, anisotropy degree and degree of lineation and foliation; some of the variation may also be related to weathering effects. The results are consistent with a primary AMS pattern resulting from thermal contractive stresses during column formation. Comparison of results from previous studies of columnar basalts reveals that there is a relatively large variation in AMS properties. There appears to exist a number of factors which may locally control the magnetic anisotropy of columns and very likely some of their other characteristics. 相似文献
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不同方向周期反复荷载作用下T形柱的性能 总被引：20，自引：2，他引：18
本文通过１５根钢筋混凝土Ｔ形柱在周期反复荷载作用下的试验研究,分析了三个不同水平力方向Ｔ形柱的强度、刚度、延性,对平截面假定的适用性、恢复力模型等也进行了探讨。为Ｔ形柱抗震设计提供了依据。 相似文献
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Bidirectional substructure pseudo‐dynamic tests and analysis of a full‐scale two‐story buckling‐restrained braced frame 
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下载免费PDF全文 Hsen‐Han Khoo Keh‐Chyuan Tsai Ching‐Yi Tsai Cheng‐Yu Tsai Kung‐Juin Wang 《地震工程与结构动力学》2016,45(7):1085-1107
A two‐story buckling‐restrained brace (BRB) frame was tested under bidirectional in‐plane and out‐of‐plane loading to evaluate the BRB stability and gusset plate design. The test comprised pseudo‐dynamic loadings using the 1999 Chi‐Chi earthquake scaled to the 50%, 10%, and 2% probability of exceedance in 50 years and a cyclic regime of increasing amplitudes of up to 3.0% story drift ratio (SDR). The specimen had a unique configuration where the beams were connected to the columns through shear tabs welded to the column flanges and bolted to the beam webs. Stable hysteretic behavior with only minor cracking at the gusset‐to‐column welds was observed under the pseudo‐dynamic tests, with maximum in‐plane and out‐of‐plane SDRs of 2.24% and 1.47% respectively. Stable behavior continued into the cyclic test where fracture of the gusset‐to‐column welds occurred in the first cycle to simultaneous bidirectional SDR of 3.0%. The observed BRB stability is consistent with a methodology developed for BRB frames under simultaneous in‐plane and out‐of‐plane drifts. The specimen behavior was studied using a finite element model. It was shown that gusset plates are subjected to a combination of BRB force and frame action demands, with the latter increasing the gusset‐to‐beam and gusset‐to‐column interface demands by an average of 69% and 83% respectively. Consistent with the test results, failure at the gusset‐to‐column interfaces is computed when frame action demands are included, thus confirming that not considering frame action demands may results in unconservative gusset plate designs. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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ICT切片重构模型的剖切及应用 总被引：3，自引：0，他引：3
在ICT切片重构模型的可视化中,为了分析重构模型的任意截面形状,并且观察该截面的内部结构,需要对重构模型进行剖切.本文针对剖切提出一种简单方法,该方法利用剖切面对重构模型所在的立方体图像空间进行剖切,生成交点集合,然后将空间剖切平面映射到二维图像平面上,最后计算空间剖切平面图像的灰度值,得到剖面图像.通过剖面图像,可以直观地看到内部结构形状,为后续无损检测奠定基础. 相似文献
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电离层影响下不同类型源激发的电磁场特征 总被引：3，自引：1，他引：2
大地电磁法(MT)和可控源音频大地电磁法(CSAMT)虽然在多种勘探领域均得到了广泛的应用,但是也存在着一些问题.于是结合了这两种勘探方法的优点,一种采用固定的大功率源进行电磁波发射,在全国范围内进行电磁信号接收的人工源电磁法得到了发展.此方法中收发距可达上千公里,在此大尺度范围下如何保证电磁信号的强度成为一个关键问题,而其中发射源的类型是决定着信号强度的重要因素.当收发距很大时,电离层的存在将影响到电磁信号的传播,为了探讨适合于大功率固定源方法的发射源类型,本文将大功率固定源方法模型抽象为地-电离层模型,研究电离层影响下的三维积分方程法,其中地-电离层模式背景模型的格林函数用波数域中的层矩阵法获得.利用此正演方法模拟对比了发射源分别为水平长线源、环状源和L型源时电离层影响下的电磁场传播特征,并初步探讨了L型发射源对三维异常体的分辨能力.综合分析认为L型源是较优的发射源,有利于在大功率固定源方法中进行实际应用. 相似文献
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Andrea Belleri Fabrizio Cornali Chiara Passoni Alessandra Marini Paolo Riva 《地震工程与结构动力学》2018,47(2):397-417
Recent earthquakes in Italy (L'Aquila 2009 and Emilia 2012) highlighted the vulnerability of precast cladding panels, typically associated with a connection system not designed to account for displacement and rotation compatibility between the panels and the supporting structure. Experimental investigations were performed in the past to investigate the in‐plane performance of cladding panels and design recommendations have been made accordingly; however, in the case of out‐of‐plane seismic loads, the load demand is commonly evaluated in the design practice by means of formulations for nonstructural components. This paper summarizes the results obtained from parametric analyses conducted to estimate the out‐of‐plane load demand in column‐to‐column cladding panels typical of one‐storey commercial and industrial buildings. Empirical equations suitable for both new and existing panels are proposed and compared with the design equations given in Eurocode 8 and ASCE 7. The paper also considers the effects of the development of plastic hinges at the column base and of the roof flexibility on the load demand in panel‐to‐column connections. The roof flexibility may generate the torsion of the panels; consequently, an analytical procedure to account for such effects is proposed. Finally, general design recommendations are made. 相似文献
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In this paper changes in focal mechanisms, parameters of wave spectra, and stress drops for the M S=5.0 foreshock and M S=6.0 mainshock in February 2001 in Yajiang County, Sichuan, and seismicity in epicentral region are studied. Comparison of focal mechanisms for the Yajiang earthquakes with distribution patterns of aftershocks, the nodal plane I, striking in the direction of NEN, of the Yajiang M=5.0 event is chosen as the faulting plane; the nodal plane II, striking in the direction of WNW, of the M=6.0 event as the faulting plane. The strikes of the two faulting planes are nearly perpendicular to each other. The level of stress drops in the epicentral region before the occurrence of the M=6.0 earthquake increases, which is consistent with increase of seismicity in the epicentral region. The rate decay of the Yajiang earthquake sequence, changes in wave spectra for foreshocks and aftershocks, and focal mechanisms are complex. 相似文献