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为研究多层钢框架半刚性梁柱端板连接的抗震性能,对8个不同构造端板连接足尺试件进行了循环荷载试验研究, 分析了端板厚度、螺栓直径、端板外伸加劲肋、柱腹板加劲肋、平齐式和外伸式等因素对节点承载力、转动刚度、极限转动 能力、耗能能力、延性和极限破坏状态的影响。试验结果表明,半刚性梁柱端板连接具有良好的延性和耗能能力,可以应用 于多层抗震钢框架中。根据试验结果及相关分析,提出了多层抗震钢框架中端板连接的标准构造为:两端外伸,设置柱腹 板加劲肋和三角形端板加劲肋,柱翼缘在端板外伸边缘上下各100mm范围内局部加厚,厚度与端板厚度相同。对提高端 板连接节点的抗震性能提出了宜采用大直径螺栓、中等厚度端板的设计建议。本文还在"强节点,弱构件"抗震设计一般原 则的基础上提出了"强连接,弱板件"的端板连接抗震设计概念。 相似文献
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方钢管混凝土穿芯高强螺栓-端板节点滞回性能研究 总被引:2,自引:0,他引:2
对3个方钢管混凝土柱穿芯高强螺栓-端板节点试件进行了伪静力试验研究。采用有限元程序ANSYS对节点进行了循环荷载作用下的三重非线性有限元分析,研究了轴压比、混凝土强度、高强螺栓预拉力、端板厚度及端板加劲肋等因素对节点滞回性能的影响。结果表明,轴压比和混凝土强度对节点滞回性能影响较小,减小高强螺栓预拉力将显著降低节点的耗能能力,端板加劲肋和端板厚度对节点性能有明显的影响,但设置加劲肋比增加端板厚度对改善节点性能更有效。试验与计算结果表明,穿芯高强螺栓-端板节点具有很好的强度、刚度、延性和耗能能力。 相似文献
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为了研究钢框架中梁柱端板连接节点的滞回性能,本文进行了8个节点试件的循环加载试验,其中有7个试件的柱端施加了轴向压力,4个端板设置了加劲肋。试验结果表明:端板连接具有良好的延性和耗能能力,节点的转角都超过了0.03rad;端板刚度是影响节点滞回性能和极限承载力的决定性因素;端板较薄时,端板加劲肋不但可以显著提高端板刚度,而且可以延缓梁翼缘与端板间焊缝的开裂,有效提高承载力,减小撬力。最后根据试验结果提出了设计和施工建议。 相似文献
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为研究不同连接构造的部分包覆钢-混凝土组合梁柱节点(PEC梁柱节点)的抗震性能,对2个PEC梁柱节点试件进行了拟静力加载试验,研究了低周往复荷载作用下PEC梁柱节点试件的破坏现象、滞回曲线、骨架曲线、延性、耗能能力和刚度退化等抗震性能。结果表明:强轴连接PEC梁柱节点的滞回曲线呈梭形和弓形,在达到极限承载力后仍能保持一定的延性和耗能能力;弱轴连接PEC梁柱节点牛腿与梁间的焊缝处发生破坏,未展现出预期的耗能能力,PEC梁仍在弹塑性状态,没有达到极限状态;PEC梁柱节点核心区混凝土替换为加劲肋板后,试件仍具有较好的承载力、延性和耗能能力,刚度退化规律无明显变化,且强轴连接节点与弱轴连接节点刚度变化规律基本一致;PEC柱牛腿设计过短会导致焊缝连接处断裂,试件延性和耗能能力得不到发挥,剩余刚度较大。 相似文献
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针对钢框架梁端腋板加强节点,设计制作6个梁柱节点试件,进行低周往复加载拟静力试验,分析对称和非对称腋板加强式节点的破坏模式、承载力、延性、耗能、刚度及承载力退化等抗震性能,并与板式加强式和普通节点试件的抗震性能进行比较。试验研究表明:梁端腋板加强式节点试件在加载过程中表现出良好的塑性变形能力,能有效将塑性铰移至加强板以外位置,荷载-位移滞回曲线比较饱满,表现出良好的耗能能力和延性,加强板末端梁腹板设置的横向加劲肋可以减缓腋板端部变截面处的应力集中现象。非对称腋板加强式节点试件的正负向加载刚度表现出不对称性,随梁端塑性铰形成,等效刚度退化趋向稳定,普通节点试件等刚度退化曲线呈直线降低,非对称腋板加强式节点试件的承载力退化曲线波动较大。 相似文献
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通过对6个具有不同构造特征和几何尺寸的H形钢梁-柱半刚性连接试件进行拟静力试验和有限元分析,得到节点弯矩-转角(M-θ)滞回曲线及M-θ骨架曲线,分析了试件的极限弯矩、连接初始刚度、延性、耗能性等性能。研究结果表明:对于几何尺寸相近的梁柱端板连接,柱强轴方向翼缘-端板连接的极限弯矩及初始连接刚度远高于柱弱轴方向的腹板-端板连接,且后者的延性也比较差;采用弱轴方向的端板连接,应在腹板的两个方向同时设置加劲板,以保证有足够的连接强度和延性;在柱翼缘设置抗剪托板对于梁柱外伸端板连接性能无明显影响,而且延性还有降低趋势。 相似文献
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Wei-Yong Wang Guo-Qiang Li Yu-Li Dong 《钢结构》2008,23(2):81-81
为得到外伸端板节点的抗火性能,采用火灾试验炉对4个足尺H型钢进行了火灾行为的研究。从试验中得到了外伸端板节点试件的破坏特征和破坏模式。通过比较有无加劲肋以及不同厚度的端板的节点的抗火能力,分析了加劲肋和端板厚度对节点抗火能力的影响。此外,还描述了弹簧模型,用于预测外伸端板钢节点在高温下的性能。节点构成被认为由预先设定力学性能的弹簧构成,例如,刚度和强度。高温下的节点响应可以通过汇集构成、刚度和强度来预测,而刚度和强度的下降由中国现行的钢结构火灾安全技术规范建议的升温过程来设定。结果表明,模型计算结果与试验数据很吻合。 相似文献
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Wei-Yong Wang Guo-Qiang Li Yu-Li Dong 《Journal of Constructional Steel Research》2007,63(8):1127-1137
In order to investigate the fire-resistant capacity of extended end-plate joints, an experimental study was performed by using a furnace on four full-scale specimens made with H-shaped steel. The failure characteristics and failure modes of the extended end-plate joint specimens in fire were obtained from the experiment. The influence of rib stiffeners and depth of end-plates on fire-resistant capacity of the joints was found by comparing the capacity of the joints with and without rib stiffeners and different depths of end-plate. In addition, this paper also describes a spring-component model employed for predicting the behaviour of extended endplate bare-steel joints at elevated temperature. The components of a joint are considered to consist of spring components with predefined mechanical properties, i.e. stiffness and strength. The response of the joints subjected to elevated temperature can be predicted by assembling components, the stiffness and strength of which are assumed to degrade with increasing temperatures based on the recommendations presented in the Chinese Technical Code on Fire Safety of Steel Building Structure. It is demonstrated that the results from the model agree with experimental data quite well. 相似文献
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Wei-Yong Wang Guo-Qiang Li Yu-li Dong 《Journal of Constructional Steel Research》2008,64(12):1456-1462
Although beam-to-column joints are known to have a very significant effect on the behaviour of steel frames in the event of fire, no specific approach for evaluating the behaviour of extended end-plate joints in fire has been proposed. In this paper, on the basis of the current Chinese Code for Design of Steel Structures [Chinese code for design of steel structures. 2002] and Technical Code on Fire Safety of Steel Building Structures [Chinese Technical code on fire safety of steel building structure. CECS, 2006], analysis is presented on the load-bearing capacity of extended end-plate joints in fire, by taking the mechanical properties of steel at elevated temperature into account. A practical approach for fire-resistance calculation and assessment of the joints is proposed, based on the load-bearing capacity of the components of joints at elevated temperatures including the bolt, extended end-plate, column flange and panel zone. Employing the practical approach, the critical temperatures of two extended end-plate joints are predicted. By comparison with the results measured from the tests, the effectiveness of this practical approach is verified. 相似文献
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试验测试了循环荷载作用下的一组8个足尺的钢梁柱端板连接弯矩。研究的参数有端板厚度、螺钉直径、外伸端板加劲肋、柱加劲肋、齐平/外伸端板的类型。试验结果反映在弯矩能力曲线、转角刚度、转动能力和滞回曲线上。试验结果显示:延伸的端板连接有足够的强度、节点转动刚度、延性和抗震结构中要求的耗能能力。基于试验结果和分析,提出了在钢结构抗震设计中对端板连接弯矩的一些详细要求,为保证在地震作用下端板连接能够提供足够的转动能力和耗能能力,并使最终破坏模式为延性破坏,推荐了三种失效模式和相应的抵抗能力。为考虑端板连接向两侧延伸,本文还提出了一种双线性的运动硬化弯矩-转角(M-R)滞回模型。 相似文献
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为研究半刚性连接梁柱组合节点的抗震性能,开展了1个纯钢框架梁柱中节点、2个组合框架梁柱中节点的低周反复荷载试验。梁柱采用平齐式高强螺栓端板连接,试验采用柱顶加载模式。对试件的试验现象、变形、应变和耗能能力等进行了分析和比较。试验结果表明,组合节点相对于纯钢节点而言,由于负弯矩作用下钢筋的抗拉作用和正弯矩作用下混凝土板的抗压作用,其受弯承载力和转动刚度均有较大程度地提高;连接弯矩-转角关系的滞回曲线饱满、稳定,具有良好的耗能能力;平端板连接梁柱组合节点在反复荷载作用下具有较高的承载力和良好的延性,抗震性能良好。 相似文献
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A kind of bolted beam-height adjustable beam-to-column connections (BHA connections) is proposed for moment-resisting steel frames. It is applicable when the height of beams change in small ranges. A BHA connection is composed of a T-shaped connector, an L-shaped connector with ellipse-type blot holes and bolts. A cyclic test on four full-scaled subassemblies and a series of numerical parametric analyses of BHA connections were conducted to study their mechanical performance. The test results show that the BHA connections with properly stiffened L-shaped connectors possessed good hysteretic properties, stabile secant stiffness and load-carrying capacity degradation and excellent energy dissipation capacity. And the effect of connector slippage and beam web eccentricity was negligible. It can be found in the parametric study that the flange thickness of T-shaped connectors played a pivotal role both in the load-carrying capacity and elastic stiffness of BHA connections, and the elastic stiffness was also affected by the thickness of T-shaped connector webs, L-shaped connector flanges and webs, and column stiffeners. Moreover, the numerical results also demonstrated that the column stiffeners in joint regions could improve the efficiency of load transfer between beams and columns. This kind of connections can be used to assemble steel frames expediently. 相似文献
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为研究钢框架梁端连接板与柱翼缘间加设垫板的平齐式端板连接节点的工作性能,设计了9个平齐式端板连接节点足尺试件,其中5个加设了厚度为4mm,8mm,10mm的垫板,其余4个为未设垫板的对比试件。通过梁端单调和循环加载试验,研究了垫板对节点刚度、承载力、转动能力、滞回性能和破坏模式的影响。试验及分析结果表明,在本文研究的节点参数范围内(即加入厚度不大于梁端板厚度或螺栓直径1/2的垫板)垫板对节点的工作性能没有太大的影响。通过对螺栓变形的观察发现,随着垫板厚度的增加,对螺栓的受力会有不利的影响,因此,在可能的情况下应避免使用较厚的垫板。 相似文献
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壁式钢管混凝土柱是一种特殊的矩形钢管混凝土柱,针对壁式钢管混凝土柱截面特点,提出了壁式钢管混凝土柱平面外穿芯拉杆-端板连接梁柱节点。通过3个足尺节点试件的低周反复加载试验和有限元分析,对其破坏模式、滞回行为、承载能力、变形性能等进行分析。结果表明:节点的破坏模式为钢梁塑性铰区破坏,破坏区域钢梁上下翼缘屈曲或撕裂,梁与端板连接焊缝撕裂;滞回曲线稳定饱满,无明显捏拢;节点域混凝土损伤微小;破坏时位移延性系数大于3.0,等效黏滞阻尼系数大于0.34,具有良好的变形能力。所建立的有限元模型可较为准确地预测该节点在低周反复加载下的滞回行为。分析表明:随着轴压比提高,模型的延性降低;适当的增加钢梁翼缘和端板厚度可以提高节点的承载能力和延性。 相似文献