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为研究矩形钢管柱与H型钢梁单边螺栓连接节点抗震性能,对5个单边高强螺栓连接节点试件和1个常规高强螺栓连接节点试件进行了拟静力试验,研究了矩形钢管柱与H型钢梁单边螺栓连接节点破坏模式、滞回曲线、骨架曲线、延性、耗能、刚度退化等抗震性能指标,对比了单边高强螺栓与常规高强螺栓连接节点抗震性能的差异性;分析了节点构造参数对单边高强螺栓连接节点抗震性能的影响,根据节点滞回特性和单边高强螺栓受力特点提出了节点恢复力模型。研究结果表明:节点试件的破坏模式中单边高强螺栓均产生滑移现象;节点试件的滞回曲线捏缩严重,滞回曲线呈反S形,且有明显滑移直线段;节点试件初始转动刚度约为常规高强螺栓连接节点的70%,单边高强螺栓滑移使节点具有很大的转动变形能力,节点试件的极限转角为0.06~0.08 rad;节点的受弯承载力与常规高强螺栓连接节点基本一致,单边高强螺栓能够满足节点承载力设计要求;节点试件的等效黏滞阻尼系数为0.15~0.17,等效耗能系数为1.29~1.77,延性系数为1.62~2.26,其耗能和延性性能均低于常规高强螺栓连接节点;通过设置端板加劲肋可有效提高节点试件的抗震性能,设置内隔板对节点试件的抗震性能提高效果不明显;提出的节点恢复力计算模型与节点试件的试验曲线吻合较好。 相似文献
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贺泽锋何明胜焦健李望芝 《建筑结构》2017,(7):63-68
采用新型单边全螺栓连接的方形钢管柱与H型钢梁节点具有抗震性能好、安装方便的优点。设计两个节点试件:采用普通全螺栓连接的H型钢柱与H型钢梁节点及采用新型单边全螺栓连接的H型钢柱与H型钢梁节点。通过对两组试件进行低周反复试验,对比研究新型单边全螺栓节点与普通全螺栓节点的破坏形态以及承载力、滞回性能、延性、耗能能力、刚度退化等抗震性能的异同,结果表明:两组试件在破坏形态以及以上所有抗震性能方面基本接近,说明采用本课题组提出的新型单边全螺栓连接在研究方面可采用普通全螺栓连接的相关方法和理论。 相似文献
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摩擦型高强螺栓连接节点性能试验研究 总被引:3,自引:0,他引:3
通过试验,对6个采用摩擦型高强螺栓连接的钢梁和连接板连接节点域在往复荷载作用下的承载力、破坏形态以及变形性能等进行了研究。研究结果表明,摩擦型高强螺栓连接节点能够传递一定弯矩并具有较强变形能力,但其承载力较差,在设计中宜作为铰接节点处理。另外螺栓规格及螺栓排列方式对节点性能也有较大影响。 相似文献
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针对不同形式螺栓接头,充分考虑复杂接缝间的不连续性及接头预紧力,以天津滨海Z2号线盾构隧道管片纵缝为研究对象,分析比较了直螺栓、斜螺栓和弯螺栓三种接头在不同弯矩和轴力条件下对管片接缝力学性能的影响。根据分析结果给出了三种螺栓接头的适用性,以及三种螺栓接头在不同埋深、弯矩作用下的抗弯刚度建议值。研究结果表明:螺栓形式对螺栓最大受力位置影响很小;螺栓拉应力和接缝张开量随轴力的增大而减小,但接头抗弯刚度均随之增大;螺栓拉应力、接缝错台量和张开量随弯矩的提升而增大,但接头抗弯刚度随之减小。 相似文献
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《Thin》2012
The objective of this research is to investigate the seismic performance of the composite joint consisting of square concrete filled thin-walled steel tubular (CFTST) column and steel beam with end plate and blind bolts. The cold-formed square tube in each CFTST column connection was fabricated by seam welding together four pieces of lipped angle with nominal wall thickness 1.5 mm or 3 mm. Four exterior joint specimens were tested under axially compressive load on the top of the columns and cyclic loads on the beam tip. The experimental parameters in the study were the thickness of the steel tube and the type of end plate. The seismic response of the blind bolted moment joints to CFTST columns was analyzed and evaluated in terms of the hysteretic behavior, failure modes, stiffness and strength degradation, ductility, and energy dissipation capacities of the joints. To improve the tension behavior of the blind bolted moment connections to the thin tube wall, the anchorage action of reinforcing rebar welded to the bolts with concrete-filled steel tubes was also investigated to consider the effect of cyclic loading. The experimental and analytical results indicated that when the end plate thickness is not less than 3 mm, the flush or extended end plate joints to CFTST columns exhibited large hysteretic loops and excellent seismic performance, such as ductility and energy dissipation capacity. The proposed innovative blind bolted joint was verified as a reliable and effective solution applied in mid- and low-rise buildings through properly design and detailing. 相似文献
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An experimental programme to obtain the behaviour of blind bolted extended end plate joints to circular or square concrete-filled steel tubular (CFST) columns under monotonic loading has been conducted. In order to enhance the strength and stiffness of the connections, the anchorage extensions are provided to the blind bolts to link the connection back into the concrete with the tubular. This paper investigated the effect of the end plate thickness and the column section type on the static behaviour and failure modes of the tested connections. The structural performance of the blind bolted extended end plate connections was evaluated in terms of the moment–rotation relationship, connection rigidity, the deformation pattern and the strain response. The test results showed that the blind bolted extended end plate connection to CFST columns exhibits high strength and stiffness, while its connection rotation capacity satisfies the ductility requirement for earthquake resistance in aseismic region. The experimental studies also demonstrated that the strength and stiffness of the connections can be improved by providing anchorage extensions to the blind bolts, and utilising moderately thick end plates leads to joints approaching full strength for the extended end plate connections. 相似文献
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为研究冷弯方钢管柱-H型钢梁外伸端板单向螺栓(hollo-bolt)连接节点的静力性能,对3个足尺寸的边柱节点进行了静力加载试验,试验研究参数为端板厚度和柱壁厚度。通过分析试验现象得到了不同端板厚度、柱壁厚度下单向螺栓连接节点的静力性能及破坏机理等,绘制了弯矩-转角曲线,对节点核心区各组件的应力-应变曲线进行了详细的分析。研究结果表明:随端板厚度增加,节点承载力不断增加,当端板厚度达到16mm后,端板厚度不再是节点承载力控制的主要因素;在其他条件不变的情况下,柱壁厚度对节点承载能力及转动能力有显著影响,柱壁厚度增加可有效提高节点刚度和承载能力。节点的极限转角较大,节点具有良好的变形能力,破坏形态主要有端板弯曲变形、单向螺栓套筒剪断和柱壁鼓曲变形破坏3种。 相似文献
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为了深入研究单边高强螺栓连接中空夹层钢管混凝土柱组合节点的抗震性能和破坏机理,对4个方套方中空夹层钢管混凝土柱与钢-混凝土组合梁单边高强螺栓端板连接节点进行了低周反复加载试验,以端板形式和柱截面空心率为主要试验参数,考察了节点破坏模式和组合楼板裂缝分布规律,研究节点滞回曲线、连接弯矩-转角关系、刚度和承载力退化、延性和耗能等抗震性能指标;通过分析端板、钢梁和节点核心区的应变分布规律,探讨节点的破坏机理。研究结果表明:单边高强螺栓连接方套方中空夹层钢管混凝土柱组合节点具有优越的抗震性能和良好的延性,连接安全可靠,适于高烈度地震区应用。 相似文献