钢筋砼框架梁柱偏心外节点抗震性能的试验研究

1．前言1．1框架梁柱节点，是建筑结构的关键部位，它受力复杂，施工也较困难，大量试验和震害调查表明，节点往往是框架结构破坏的主要部位，而且其破坏后的修复工作也较难进行。为此，国内外进行了大量的节点抗震的试验研究，提出了许多节点设计建议。但绝大多数都集中在梁柱     

杭州国际会议中心巨型铸钢节点试验研究

为探究复杂应力状态下铸钢的受力性能,对杭州国际会议中心巨型钢框架铸钢节点进行了试验研究。通过对其进行原型结构跟踪测试,得到了节点表面各测点的应力分布及测试值。利用AUTOCAD软件建立试验铸钢节点计算模型,并采用有限元软件模拟了不同受力状态下节点的弹塑性计算分析。通过比较测点实测应力值和计算分析值,两者吻合良好,由此可以推断铸钢节点内部应力分布及大小。最后对铸钢节点的受力性能和安全性做出了评价。试验和分析结果表明该铸钢节点安全可靠,具有充足的强度储备。     

天津奥林匹克中心体育场铸钢节点试验研究

天津奥林匹克中心体育场大跨度钢管桁架结构铸钢节点受力和构造复杂,为考察铸钢节点的受力性能,评价其安全性,对铸钢节点进行了足尺试验和有限元计算分析。首先建立节点有限元实体模型进行有限元计算分析;根据有限元计算结果,布置应变测点,对节点进行设计荷载作用下的试验,得到节点应力试验值。结合试验结果与有限元计算结果,分析了节点的应力分布规律,表明天津奥林匹克中心体育场铸钢节点具有较高的承载性能和足够的安全性。     

盘销式钢管支撑架结构力学性能试验研究

对一种新型盘销式钢管支撑架结构力学性能进行了较为系统的研究,包括盘销节点连接可靠性、插销抗拔承载力、水平杆与立杆连接节点刚度、基本受力单元体受力性能。研究结果表明:盘销连接节点具有可靠性;楔形设计的插销具有自锁功能,在正常工作中插销不会自动向上滑出;水平杆与立杆连接节点为半刚性连接,通过试验分析测得了节点刚度系数;开展基本受力单元体受力性能研究得出了不同构造条件下的支撑架破坏形式和极限承载力,通过对比确定了斜撑布置情况、支架顶部悬臂长度、立杆步距对支撑架结构力学性能的影响情况。     

索网次结构-主体钢结构连接转换节点计算分析与试验研究

河南艺术中心艺术墙为"单层索网次结构-钢管相贯桁架主体钢结构"体系。转换节点是实现主次结构共同工作力学效应、保证整体结构安全的关键节点之一。主次结构的连接转换节点有着与普通钢节点完全不同的索-钢接触单元的特殊构造,受力复杂。设计应用ANSYS软件对索钢转换节点进行带接触单元的弹塑性有限元计算分析,并进行足尺节点试验研究,确认了该复杂节点力学性能计算设计的正确性,确保了该类关键节点的安全性。     

咸阳国际机场T3A航站楼屋盖圆管相贯节点试验研究

西安咸阳国际机场二期扩建工程T3A航站楼的钢结构屋盖节点形式采用构造复杂的空间加强套管相贯节点。由于节点构造复杂,不能简单按现行钢结构规范进行极限承载力计算,为考察节点的受力性能,对三个足尺试件模型进行试验研究,并运用有限元的方法进行分析。试验结果表明,试件的承载力均能达到SJ2c支管设计荷载水平的1.8倍以上,且试件无宏观破坏现象。试验和有限元分析结果证明,节点采取加焊套管的加强措施是有效的。     

复杂受力状态下大型铸钢节点的性能研究

某钢框架结构中的铸钢节点,体积巨大,自重较大,且受力状态复杂.现有理论无法完全考虑节点制作过程中的各种缺陷,也无法分析其在复杂受力状态下的力学性能.通过应力等效原则,将实际复杂受力状态简化成简单的轴向拉压状态,以方便加载试验.利用ANSYS软件分析实际受力状态和简化受力状态下的节点性能,验证简化过程的合理性.对铸钢节点...     

T型钢结构全焊节点抗震性能研究

在实验室制作了3个T型钢结构节点试件,通过对结构施加拟静力来模拟地震作用,分析钢结构节点受力过程中的变形规律,并对其受力过程中的滞回曲线进行分析,得出影响节点受力性能的一些规律,同时利用ABAQUS有限元软件对梁柱T形全焊节点进行了模拟分析,研究构件的尺寸变化对节点裂缝的影响,并和试验结果进行对比分析。通过对钢结构节点的试验研究和模拟分析,为研究钢结构节点的抗震性能、破坏特征、探伤及识别做了有益的探索,同时得到了一些具有参考价值的试验数据,总结了提高抗震性能的一些措施。     

江阴魔方时代广场SRC梁柱节点试验研究

江阴魔方时代广场主楼为罕见的大悬挑结构,核心区梁柱节点荷载较复杂。对关键节点进行足尺模型试验,研究节点在静力荷载下的受力性能并验证其安全性,试验结果表明:在1.0倍设计荷载作用下,节点全部处于弹性状态;在1.6倍设计荷载作用下,节点未发生破坏。对试件进行了有限元分析,计算节点的极限承载力。计算结果表明:有限元分析与试验结果吻合,节点设计安全合理。     

钢管混凝土与钢梁斜交节点的试验研究

加强环式节点是钢管混凝土柱 -钢梁体系的常见连接形式 ,认识此类节点的受力性能对结构设计至关重要。在国内外已有的试验及理论研究中 ,主要针对钢管混凝土柱与钢梁垂直正交节点 ,而对斜交节点的研究没有报道。通过对 6个多向相交节点的试验 ,分析了斜交节点核心区在静力加载全过程中的应变与转角变化特点。结合试验现象 ,对此类节点的设计提出一些建议 ,建立了加强环式斜交节点的承载力计算经验公式。     

Testing of composite steel top-and-seat-and-web angle joints at ambient and elevated temperatures, Part 1: Ambient tests

This paper presents six ambient tests on composite steel top-and-seat-and-web (TSW) angle joint specimens subject to monotonic loading. It is well known that the inherent strength and stiffness of composite semi-rigid joints can improve the structural behaviour of steel frame structures. However, experimental works on the composite steel TSW angle joints are very limited. The main objective of this study is to ascertain the ambient moment-rotation characteristics of composite steel TSW angle joints and to validate the authors’ mechanical model. The test results are presented and the joint failure modes are described. The effects of some parameters on the overall joint behaviour, such as longitudinal shear strengths of RC slabs, steel beam depths and tightening torques of bolts are investigated. With the development of a new joint component to represent the RC slab in tension, the authors’ mechanical model proves to be able to produce accurate and consistent predictions of the moment-rotation characteristics of composite steel TSW angle joints. The analytical results are compared with the test results and good agreement is achieved.     

钢板攻丝高强螺栓连接钢框架节点力学性能试验研究

对采用钢板攻丝高强螺栓连接的钢框架节点分别进行了高强螺栓拉伸及剪切试验、钢柱法兰连接节点静力及拟静力试验、梁柱半刚性连接静力试验.基于试验数据对节点连接的承载能力、失效模式以及刚度特征等关键问题进行了分析.研究结果表明:由自攻螺纹钢板及高强螺栓构成的连接形式具有良好的抗拉、抗剪性能,以螺杆断裂为最终破坏模式;钢柱法兰连...     

Stiffness of joints in bolted connected cold-formed steel trusses

Web members in cold-formed steel trusses are usually assumed to have pinned connections at the ends, but the latest AISI Cold-Formed Steel Truss Design Standard allows for the joint stiffness to be considered in design. The paper summarizes experimental research performed for several years at the University of Timisoara, Romania, aimed at evaluating the real behaviour of bolted joints in cold-formed steel trusses. By means of tests on single lap joints and on truss sub-assemblies, a theoretical model for joint stiffness was proposed. The formula for the joint stiffness, from which the buckling length of web members was further determined, was also validated through a test on a full-scale truss.     

可恢复功能预制装配式损伤可控钢质节点抗震性能试验研究

提出一种震损后可恢复功能预制装配式损伤可控钢质节点,该节点由带削弱型约束钢板阻尼器的损伤可控钢质铰、钢套筒约束节点核心区、预制混凝土梁柱等构成.进行预制装配式损伤可控钢质节点的低周往复荷载试验,然后在该试验的基础上仅更换钢质铰中破坏的削弱型约束钢板阻尼器,进行第2次试验,最后进行现浇钢筋混凝土节点在低周往复荷载下的对比...     

Experimental behaviour of thin-walled steel tube confined concrete column to RC beam joints under cyclic loading

This paper describes eight tests carried out on thin-walled steel tube confined concrete (TWSTCC) column to reinforced concrete (RC) beam joints subjected to cyclic loading, where the column cross-sectional type and the level of axial load in the column were selected as test parameters. In addition, two concrete filled thin-walled steel tubular column to RC beam joints were also tested for comparison. Each TWSTCC joint specimen consisted of a TWSTCC column and a RC beam pass through the column to represent an interior joint in a building. The experimental results are analysed to evaluate the influences of different testing parameters on the performance of the beam-column joints. It was found that the TWSTCC joints show generally excellent seismic performance and is adoptable in practical engineering, particularly in earthquake zone.     

Testing of composite steel top-and-seat-and-web angle joints at ambient and elevated temperatures: Part 2 — Elevated-temperature tests

An experimental programme of eight elevated-temperature tests on composite steel top-and-seat-and-web (TSW) angle joints was carried out to investigate the behaviour of this form of joints under fire conditions. It is found that the inherent strength and stiffness of composite joints can significantly improve the structural behaviour of steel framed structures under fire conditions. However, experimental works on composite steel TSW angle joints under fire conditions have not been published yet. To develop a versatile model to predict the joint moment-rotation characteristics, the authors have developed a component-based mechanical model for this form of joints. The objectives of this study are to ascertain the moment-rotation characteristic for this form of joint at elevated temperatures and to validate the authors’ mechanical model. The effects of some parameters on the overall joint behaviour, such as elevated temperatures, longitudinal shear strength of RC slabs, steel beam depth and bolt behaviour were observed and investigated. The mechanical model predictions are compared with the test results and showed good agreement.     

循环荷载作用下薄壁钢管混凝土梁柱节点的试验性能研究

描述了循环荷载作用下薄壁钢管混凝土梁柱节点的8个试验,选取了柱的横截面类型和轴压力水平作为试验参数。此外,选取2个钢管混凝土梁柱节点试验已进行对比。每个钢管混凝土梁柱节点构件都由钢管混凝土柱及柱上方的梁构成,作为建筑的内部节点。对试验结果进行分析,评测了不同的参数对于梁柱节点性能的影响。结果表明:薄壁钢管混凝土柱显示出了卓越的抗震性能和良好的适应性,特别适用于地震区使用。     

钢骨混凝土柱框架节点的试验研究

本文研究了在钢管上开孔对配有圆钢管的钢骨混凝土柱-钢筋混凝土梁组合框架节点受力性能的影响。介绍了三种节点承受低周反复荷载的试验,第一种是不开孔的,第二种是开穿筋小圆孔的,第三种是开矩形大孔的。试验结果表明,开穿筋小圆孔的节点受力性能最好。主要原因是穿过圆钢管的梁主筋与钢管内的混凝土有很好的粘结;在钢管的小孔处形成了钢筋混凝土抗剪销钉,小圆孔也使得钢管内外的混凝土得以沟通;同时钢管参加受剪的主要部位位于节点高度的中部,故在节点上下边缘处开小圆孔对节点受剪性能影响不大。本文研究成果已用于南京新世界大厦,并对研究其他的组合框架节点有参考价值。     

Effect of clamping pressure and joint geometry on corrosion induced bowing and distortion of bolted joints in weathering steel

Field experience with bare weathering steel indicates that bolted joints of sufficient stiffness will resist the distortion caused by the pressure of corrosion products forming within the joint. As a result of these observations, guidelines were previously written for the design of joints in transmission towers and similar structures. To gain more information on the pressure caused by corrosion-product formation, specimens were exposed to the atmosphere for test periods of up to seven years.The test specimens include stacks of Cor-Ten A steel (A242 Type 1) and carbon steel compressed together with spring washers and exposed at Monroeville, Pennsylvania, and the 800-foot lot, Kure Beach, North Carolina. Also, stacks of Cor-Ten A steel and carbon steel compressed together at lower pressures were exposed in Monroeville. Various joints of Cor-Ten B steel (A588 Grade A), including geometries that did and did not meet the previously developed guidelines, were exposed at both sites, along with test joints similar to those used on a transmission tower and comparison joints modified to meet the guidelines.The results of the stack tests indicate that at sufficiently high initial force no expansion of the stacks occurs, but at very low pressures there will be continuous expansion of stacks. Cor-Ten A steel was found to produce more expansion than carbon steel at similar initial pressures.Bolting, as specified, with A325 bolts minimized distortion caused by corrosion product pressure for a given joint design. At both sites, stiffer joints produced less distortion at free edges; however, joints that met the guidelines of free edge distance did not eliminate the distortion. Joint designs that met the guidelines developed very little bowing between bolts during exposure at either site. Also, tests of comparison specimens showed that the bowing between bolts in a transmission-tower joint with A325 bolts can be reduced significantly by simply reversing one set of details so that the spacing meets the guidelines.All observations confirm that the use of the previously published guidelines for the design of bolted joints in bare Cor-Ten steel transmission towers and similar structures will prevent excessive bowing and joint distortion.     

钢框架梁、柱节点在反复循环荷载作用下的试验研究

为了研究高层钢框架结构梁、柱节点受力、变形性能及破坏特点,作者对五个梁、柱节点进行了反复循环荷载作用下的试验,本文介绍了试验情况,分析了试验结果,并对节点设计提出了一些建议。