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Wan-Shin Park 《Journal of Constructional Steel Research》2005,61(11):1492-1524
Steel coupling beams in a hybrid coupled shear wall provide a viable alternative for concrete coupling beams coupling individual reinforced concrete wall piers. Due to the lack of information, current design methods for calculating embedment lengths are silent about cases in which hybrid coupled walls have connection details of stud bolts and horizontal ties. In this work, an analytical study was carried out to develop a model for calculating the embedment lengths of embedded steel sections. Five models for calculating embedment lengths in a hybrid coupled wall are developed as variations of the Prestressed Concrete Institute guidelines for steel brackets attached to reinforced concrete columns. In addition, experimental studies on the hybrid coupled shear wall were carried out. The main test variables were the ratios of the coupling beam strength to the connection strength. The test results indicate that it is more advantageous to design the coupling beams as shear yielding members since the shear-critical coupling beam exhibits a more desirable mode of energy dissipation than the flexure-critical coupling beam. 相似文献
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为研究空间钢构架混凝土简支深梁的静力性能,进行了4根空间钢构架混凝土深梁试件和作为对比试件的2根普通钢筋混凝土深梁在竖向对称集中荷载作用下的模型静载试验。试验参数为跨高比、配筋方式等。试验结果表明,与相同条件(除配筋方式外)的普通钢筋混凝土深梁相比,配置空间钢构架的混凝土深梁不仅刚度增大,而且其受剪承载力和变形能力也有较大幅度的提高,合理配置空间钢构架可改善混凝土深梁的延性。除配置水平和竖向分布钢筋外,沿主拉应力迹线方向配置斜向分布钢筋,或沿主压应力迹线方向设置斜向暗梁等措施可进一步提高空间钢构架混凝土深梁的受剪承载力。结合试验结果及其分析,给出了空间钢构架混凝土深梁的设计建议和构造要求,包括深梁内空间钢构架的配置范围、材料要求、混凝土保护层厚度、承重空间钢构架设计方法以及深梁内斜向分布钢筋、斜向暗梁的构造要求等。图13表4参10 相似文献
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预应力型钢混凝土框架结构竖向反复荷载作用下抗震性能试验研究 总被引:1,自引:0,他引:1
通过对1榀柱中内置型钢和1榀梁柱均内置型钢的预应力型钢混凝土框架的竖向反复荷载试验, 研究预应力型钢混凝土框架的破坏机制、滞回特性、延性、刚度和耗能等性能。结果表明:预应力型钢混凝土框架梁是梁铰破坏机制,极限状态时 “拱效应”提高了框架梁的承载能力;预应力型钢混凝土框架梁滞回曲线饱满,变形恢复能力小于普通预应力混凝土框架梁;预应力型钢混凝土框架梁位移延性系数均值为4.8,普通预应力混凝土框架梁的为4.18,均有较好的延性;等效黏滞阻尼系数介于0.258~0.323之间,说明2个试件破坏时截面具有良好的耗能能力;参数分析表明,试件延性系数受含钢率影响不大,随内置型钢截面高度与梁截面高度比值增大而增大。 相似文献
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综述相关文献,介绍型钢混凝土组合结构概念,类型和适用范围,并与钢筋混凝土、钢结构梁比较的优缺点,并给出在给定条件下设计15m大跨度型钢混凝土梁计算实例和步骤,结果与其他类型梁对比分析,得出型钢混凝土梁是符合要求的较优选择. 相似文献
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本文提出了一种新型的钢骨混凝土柱-钢筋混凝土梁的新型环梁节点,并对其进行了试验研究。该节点传力途径为:框架梁剪力经环梁扩散传递给节点以下钢骨混凝土柱,框架梁端弯矩首先传递给环梁,环梁依靠整体拉压形成力偶将弯矩传递给钢骨混凝土柱。试验采用在柱顶施加恒定轴力的同时给框架梁端施加力或强制位移荷载的加载模式,分别进行了单调受弯试验、单调受剪试验和往复荷载试验。试验结果表明,这种环梁节点可以有效实现"强节点弱构件"的设计目标,具有良好的滞回耗能能力。 相似文献
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预应力钢骨混凝土结构转换梁的设计和分析 总被引:6,自引:1,他引:6
为推广预应力钢骨混凝土的应用,对结构转换层中采用预应力钢骨混凝土梁的设计进行了介绍。通过分析比较证明了钢骨混凝土梁在性能上优于钢筋混凝土梁 相似文献
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Plate-reinforced composite (PRC) coupling beam is fabricated by embedding a vertical steel plate into a conventional reinforced concrete coupling beam to enhance its strength and deformability. Shear studs are welded on the surfaces of the steel plate to transfer forces between the concrete and the steel plate. Extensive experimental studies and numerical simulation have demonstrated the effectiveness and efficiency of this new type of coupling beam in resisting high shear force and large rotational demand from large wind or seismic loading. In this paper, an original and comprehensive design procedure is proposed to aid engineers in designing this new type of beam and to ensure proper beam detailing for desirable performance. The proposed design procedure consists of four main parts, which are (1) estimation of ultimate shear capacity of beam, (2) design of RC component and steel plate, (3) shear stud arrangement in beam span, and (4) design of plate anchorage in wall piers. Using the proposed procedure, the load-carrying capacity of the PRC coupling beams which were previously tested and simulated was evaluated. The results were compared with those from non-linear finite element analyses and experimental studies for validating the design procedure. A worked example is given to illustrate the design of PRC coupling beams using the proposed procedure. 相似文献
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为充分发挥型钢混凝土在受力性能及预制装配结构在施工等方面的优势,提出两种部分预制型钢混凝土梁。通过7个T形截面梁试件的弯曲静力试验,对部分预制装配型钢混凝土梁(PPSRC)、部分预制装配型钢混凝土空心梁(HPSRC)及全现浇型钢混凝土梁(SRC)的受弯破坏形态和承载能力进行对比分析,研究了预制装配、梁截面空心和现浇混凝土强度对PPSRC梁和HPSRC梁受弯性能的影响。研究结果表明:HPSRC梁和PPSRC梁具有相似的受弯承载力与破坏形态,预制装配与截面空心对两种梁的受力性能影响较小;随着现浇混凝土强度的提高,HPSRC梁和PPSRC梁的受弯承载力均有所提高;对两种部分预制装配型钢混凝土梁进行截面受弯承载力分析,其计算结果与试验结果吻合较好。 相似文献
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Zhi-Min Wu Cheng-He Hu Yu-Fei Wu Jian-Jun Zheng 《Construction and Building Materials》2011,25(6):2898-2905
External bonding of fiber reinforced polymer (FRP) is one of the most efficient techniques for retrofitting and strengthening concrete structures. However, the bond interface is the weakest link in such retrofitted or strengthened concrete members, resulting in premature FRP debonding. Therefore, a newly improved hybrid bonded FRP (IHB-FRP) technique is developed in this paper for strengthening concrete members. Unlike the conventional mechanical fastening method, the mechanical fasteners in the technique do not penetrate the FRP strips and the capping plates serve to apply vertical pressure to the FRP strips. An experimental study on the flexural strength of IHB-FRP technique strengthened beams is conducted. It is found that all the beams strengthened with the IHB-FRP technique fail due to tensile rupture of FRP strips even for seven plies of FRP strips. Based on the experimental results, the effects of the steel reinforcement ratio, the number of FRP plies, and the fastener spacing on the ultimate load are evaluated. Finally, a simplified method is proposed for estimating the ultimate bending moment of the IHB-FRP strengthened beam. The validity of the method is verified with the experimental results. 相似文献
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对非预应力芳纶布(AFRP)加固和带永久锚具的预应力AFRP加固锈蚀钢筋混凝土梁的疲劳性能进行研究。通过疲劳试验,探讨预应力水平和钢筋锈蚀程度对加固梁疲劳破坏机制、疲劳寿命、挠度等的影响。试验结果表明:预应力AFRP与非预应力加固梁的疲劳破坏机制相同,都为纵筋的疲劳断裂;预应力AFRP加固锈蚀混凝土梁的抗疲劳特性明显优于非预应力加固梁;预应力水平越高,中度腐蚀梁加固后疲劳寿命越高;锈蚀率越高,梁的疲劳寿命越低,重度锈蚀梁疲劳寿命的降低幅度比中度锈蚀梁更明显。通过与光面钢筋对比,获得锈蚀纵筋的等效疲劳切口系数K f。结果表明,钢筋锈蚀率的增加会导致K f增大,从而导致锈蚀梁疲劳寿命明显降低。基于试验结果,建立了预应力AFRP加固中度腐蚀钢筋混凝土梁疲劳寿命的计算公式,供桥梁加固设计参考。 相似文献
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纤维增强聚合物(FRP)筋混凝土梁受弯挠度过大、裂缝过宽等缺陷严重影响其正常使用性能,为此,将具有优良抗裂与阻裂性能的钢纤维混凝土用于FRP筋混凝土梁,可以有效限制其挠度与裂缝的发展。通过12根玄武岩纤维增强聚合物(BFRP)筋/钢筋钢纤维高强混凝土梁的受弯性能试验,研究了钢纤维体积率、受拉区钢纤维高强混凝土层厚度、BFRP筋配筋率对BFRP筋钢纤维高强混凝土梁裂缝分布与宽度的影响。结果表明,钢纤维的加入能够有效抑制BFRP筋高强混凝土梁的裂缝开展,减小裂缝间距、宽度和裂缝宽度差异性,当荷载为100 kN时,钢纤维体积率为0. 5%~2. 0%的钢纤维高强混凝土梁的裂缝宽度减小了25. 22%~54. 78%,裂缝宽度标准差减小了10. 00%~68. 18%;当受拉区钢纤维混凝土层厚度达到梁截面高度的57%时,其阻裂与限裂效果与全截面掺加钢纤维的效果接近,表明在受拉区中掺加钢纤维以限制BFRP筋混凝土梁裂缝的发展是经济可行的。基于试验和相关文献研究结果,提出了考虑钢纤维影响的BFRP筋钢纤维高强混凝土梁最大裂缝宽度的建议计算方法,该建议方法的计算值与试验值吻合良好。 相似文献
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提出采用高延性纤维混凝土改善型钢高强混凝土短梁的抗剪性能和变形能力,设计了6个高延性纤维混凝土梁(其中4个为型钢高延性混凝土短梁,2个为高延性混凝土短梁)试件和作为对比的3个混凝土梁(其中1个为型钢混凝土短梁,2个为普通混凝土短梁)试件,通过静力试验研究不同剪跨比高延性混凝土梁的破坏形态、受剪承载力和变形能力。试验结果表明:采用高延性纤维混凝土,可显著提高短梁的受剪承载力和变形能力,实现延性剪切破坏模式;发生挤压破坏的型钢高延性混凝土短梁,受剪承载力高、延性好,破坏以后仍具有较好的完整性;与型钢混凝土短梁相比,发生剪切黏结破坏的型钢高延性混凝土短梁损伤程度较小,试件破坏以后仍具有较高的剩余承载力。建立了型钢高延性混凝土短梁的受剪承载力计算式,计算结果与试验结果吻合较好。 相似文献