钢板剪力墙中墙-框架相互作用性能研究

在侧向荷载作用下,考虑填充板和框架杆件之间的相互作用,研究了钢板剪力墙双体系的非线性性能。对多组钢板剪力墙试件进行数值分析,研究填充板对框架性能的影响,评估其抵抗侧向力的有效度。结果表明:按规范设计的钢板剪力墙具有理想的屈服顺序,填充板首先进入塑性。这说明:填充板在加载初期非常有效,转角可达到1%,承担了大部分层间剪力。然而,一旦填充板中屈服区域继续发展,它们将逐渐失效;当屈服区域延伸至墙体,附加荷载将基本上由框架杆件承担。     

钢板剪力墙结构中墙-框架交互作用的特性分析

研究了钢板剪力墙(SPSW)双系统在侧向荷载作用下,由内置墙板与框架构件之间相互作用而引起的非线性反应。对大量钢板剪力墙系统进行了数值分析,基于分析结果讨论了内置墙板对框架性能的影响,并对其抵抗侧向荷载的有效程度进行了预测。结果表明:依据设计规范设计的钢板剪力墙可以获得预期的屈曲顺序,且塑性变形主要由内置墙板产生。研究验证了内置墙板在加载的初期是非常有效的(塑性变形达到角位移的1%),并且可以吸收大部分层间剪力。然而,一旦内置墙板中出现了斜向屈服区,墙板便开始丧失其有效性;当屈服区发展到整面墙的时候,外加荷载便开始由框架构件承担。     

铝合金板剪力墙抗震性能研究

传统钢板剪力墙的周边框架和内嵌板均采用普通钢材。随着耗能抗震理念的发展,将内嵌板中的普通钢板替换成低屈服点的铝合金板,组成铝合金板剪力墙。采用数值方法研究铝合金板剪力墙在单调荷载作用下的抗剪性能和在低周反复荷载作用下的滞回性能。研究显示:与普通钢板相比,铝合金板更易发生剪切屈曲不先于剪切屈服,对周边框架的要求更低且耗能性能更好。     

钢框架-钢板剪力墙结构的抗震性能分析

基于三拉杆等效模型和静力非线性分析方法,利用SAP 2000对3跨钢框架-钢板剪力墙结构进行静力推覆分析。在侧向荷载作用下,通过对钢框架-钢板剪力墙结构的底部剪力-顶点位移关系、层间位移、结构塑性发展、楼层剪力分配等指标的分析,研究梁柱节点采用刚性连接和半刚性连接时整体结构的抗震性能。结果表明:在整体结构处于弹性阶段时,钢板剪力墙承担的水平剪力为楼层剪力的50%,整体结构进入弹塑性状态时,钢板剪力墙结构承担70%~80%的楼层剪力;在侧向荷载作用下,钢板剪力墙最先进入屈服阶段,而后是框架梁端部出现塑性铰,最后部分框架柱端形成塑性铰,符合多道抗震防线的要求,具有良好的抗震性能。     

半刚性连接钢框架-非加劲钢板剪力墙结构性能研究

半刚性连接钢框架-非加劲钢板剪力墙结构弥补了传统抗弯钢框架侧向刚度不足的缺点,为采用更加经济的半刚性节点提供了可能。为研究不同梁柱连接刚度对双体系结构抗震性能的影响,完成了3个单跨两层不同梁柱连接刚度试件的水平低周往复加载试验研究,系统分析了三者的整体性能和破坏模态,拟从承载力、刚度、延性、耗能、整体性能和节点性能六个方面对双体系的节点刚度与墙体的匹配效果进行评价。结果表明:在半刚性框架内设置钢板墙能较大程度提高结构的极限承载力与侧向刚度;结构具有理想的屈服顺序,内填板在加载初期非常有效。屈服区域延伸至整个墙体时,附加荷载将基本上由边缘构件承担,试件破坏主要由内填板的屈服和框架柱的弯扭失稳控制;节点刚度退化小,且内填板的设置缓解了节点区自身的延性要求,梁柱连接形式对试件的抗侧刚度和整体强度的影响不大,降低连接刚度有利于提高试件延性和耗能能力。     

抗弯钢框架-密肋网格复合钢板墙抗侧力体系抗震性能理论与试验研究

提出了密肋网格复合钢板剪力墙,并与抗弯钢框架相结合,充分发挥各自的性能。从理论和试验两个方面对其抗震性能进行了研究。其中理论分析主要研究了密肋网格复合钢板剪力墙的受力机制,提出了密肋网格板的构造措施,并通过有限元模型分析了其受力性能;试验研究主要针对一榀双跨两层抗弯钢框架-密肋网格复合钢板剪力墙试件进行拟静力试验,考察其在低周反复荷载作用下的侧向刚度及承载性能、滞回特性、耗能能力及破坏特性等,评价了该体系的抗震性能。研究表明：该体系在弹性阶段主要依靠墙板的剪切机制和钢框架共同承担水平荷载,非弹性阶段区格中钢板的对角斜向拉力带为结构提供侧向承载能力;密肋网格板避免了墙板发生整体剪切屈曲,限制了钢板的面外变形值,提高了其弹性刚度,缓解了墙板拉力带对边框架柱的附加弯矩,保护了主要受力构件,克服了滞回曲线的捏缩现象,显著增强了其耗能能力;钢框架与密肋网格复合钢板剪力墙具有良好的协同工作性能,体系变形能力强,大变形状态下具有稳定的承载性能,安全储备高,是优秀的抗侧力体系;破坏模式为区格中钢板屈曲屈服并撕裂,拉力场效应明显,钢框架梁端及钢框架柱底形成塑性铰。     

框架-带缝钢板剪力墙抗震性能试验研究

对框架-带缝钢板剪力墙试件在恒定竖向荷载作用下进行低周往复水平加载试验,研究其抗震性能,并考察框架底梁不同边界条件对抗震性能的影响。试验结果表明：框架与带缝钢板剪力墙协同工作性能优越,有限竖向荷载及框架底梁对剪力墙的不同约束条件对剪力墙受力性能影响不大。有限元分析表明,较大竖向荷载对剪力墙受力性能可能有一定的不利影响,并给出了竖向荷载限值。通过有限元模型分析研究了框架和带缝钢板剪力墙的协同工作性能,提出了剪力墙先行屈服且充分发展耗能能力的设计原则应为结构层中剪力墙屈服承载力之和与其刚度之比小于框架系统的该比值。     

改进钢板-混凝土组合剪力墙结构受力性能分析

钢板-混凝土组合剪力墙由钢框架、内嵌钢板及一侧通过螺栓与之连接的混凝土板组成,其中传统组合剪力墙中混凝土板四边与钢框架直接接触,而改进组合剪力墙中二者之间有一定间距,以避免其在结构侧移较小时发生接触。采用ABAQUS有限元软件分别建立了组合剪力墙的精细有限元模型,研究了其受力性能以及板框相互作用全过程,分析了钢板高厚比对组合剪力墙整体承载力、抗侧刚度以及板框剪力分配等的影响。研究表明:组合剪力墙中混凝土板有效抑制钢板弹性屈曲,钢板主要以剪切屈服承载,对框架柱的附加弯矩较钢板剪力墙明显降低;相比钢板剪力墙,传统组合剪力墙承载力提高25%,抗侧刚度提高10%,混凝土板承载近30%;改进组合剪力墙承载力提高10%,抗侧刚度提高5%,混凝土板基本不承担剪力;随着钢板高厚比的减小,组合剪力墙的承载力与抗侧刚度提高,但两类组合剪力墙之间的差别变小;钢板承载比例不断增大,当钢板过厚时需要防止底层框架过早屈服。     

Analyses on mechanical performance of innovative composite shear wall systems

钢板-混凝土组合剪力墙由钢框架、内嵌钢板及一侧通过螺栓与之连接的混凝土板组成,其中传统组合剪力墙中混凝土板四边与钢框架直接接触,而改进组合剪力墙中二者之间有一定间距,以避免其在结构侧移较小时发生接触。采用ABAQUS有限元软件分别建立了组合剪力墙的精细有限元模型,研究了其受力性能以及板框相互作用全过程,分析了钢板高厚比对组合剪力墙整体承载力、抗侧刚度以及板框剪力分配等的影响。研究表明：组合剪力墙中混凝土板有效抑制钢板弹性屈曲,钢板主要以剪切屈服承载,对框架柱的附加弯矩较钢板剪力墙明显降低;相比钢板剪力墙,传统组合剪力墙承载力提高25%,抗侧刚度提高10%,混凝土板承载近30%;改进组合剪力墙承载力提高10%,抗侧刚度提高5%,混凝土板基本不承担剪力;随着钢板高厚比的减小,组合剪力墙的承载力与抗侧刚度提高,但两类组合剪力墙之间的差别变小;钢板承载比例不断增大,当钢板过厚时需要防止底层框架过早屈服。     

柱刚度对钢板剪力墙侧移集中的影响

钢板剪力墙(SPSWs)是一种由边界框架构件包围薄填充钢板组成的抗侧力系统。薄填充钢板屈服引起整体的滞回耗散和抗侧向力。然而,地震时,受很多因素的影响(如填充钢板超强)不同建筑层的薄填充钢板可能不会同时屈服,且实际的侧向力分布与设计时所假定的不同,可能导致建筑整体层间的侧移集中。研究柱刚度对减缓整体侧移集中现象的影响。根据一个两层的钢板剪力墙模型,推导出一个可表示整体性能、量化柱刚度对减缓整体侧移集中现象的影响的数学模型。使用有限元模型来进行非线性静态推覆分析,从而验证改进的模型。最后,根据改进的模型进行参数分析,随后讨论北美标准中规定的钢板剪力墙柱刚度的最小值。研究结果显示,柱刚度应该作为一种设计参数,从而确保一个合理统一的侧移分布,因此,填充钢板会沿钢板剪力墙建筑的高度方向屈服。     

Characteristics of the wall-frame interaction in steel plate shear walls

The nonlinear response of steel plate shear wall (SPSW) dual systems under lateral loading with regard to the interaction between the infill plates and frame members is studied. A number of SPSWs are numerically analyzed and the results are utilized to discuss (a) the influence of infill plates on the behavior of frames and (b) to evaluate their degree of effectiveness in resisting lateral loads. Results show that SPSWs designed according to design codes should have desirable sequences of yielding and that plastic deformations should primarily be provided by the infill plates. It is illustrated that the infill plates are very effective in the initial stages of loading (up to the drift angle of 1% ) and absorb substantial part of storey shear. However, once diagonal yield zones develop in the infill plates, they begin to lose their effectiveness; and when yield zones spread throughout the wall, additional applied loads are essentially carried by the frame members.     

Effect of column stiffness on drift concentration in steel plate shear walls

Steel plate shear walls (SPSWs) are a lateral force resisting system consisting of thin infill steel plates surrounded by boundary frame members. Hysteretic energy dissipation and lateral force resistance of the system are primarily achieved through the yielding of the infill steel plates. However, during an earthquake event, the infill plates at different building stories may not yield simultaneously due to many factors such as overstrength of some infill plates and the actual lateral force distribution which is different from the one assumed in design, possibly resulting in inter-story drift concentrations in the system. This paper investigates the effect of column stiffness on mitigating drift concentration in SPSWs. Based on an example two-story SPSW, mathematical models are derived to characterize the system behavior and quantify the effect of column stiffness on the mitigation of drift concentration. Nonlinear static pushover analyses using finite element models are performed to further validate the developed models. Finally, based on the developed models, parametric analyses are conducted to investigate the effect of column stiffness over a practical range of the considered parameters, followed by a discussion of the minimum SPSW column stiffness specified in North American codes. The results from this investigation show that column stiffness should be a design parameter to ensure a reasonably uniform drift distribution and hence a more uniform infill plate yielding along the height of SPSW buildings.     

Structural performance of steel plate shear walls with trapezoidal corrugations and centrally-placed square perforations

Steel plate shear walls (SPSWs) are an efficient lateral force-resisting system, and can be designed with corrugated and/or perforated infill plates, depending on structural considerations, architectural requirements, and service design. This paper presents a study on the structural performance of SPSWs with horizontal trapezoidal corrugations and centrally-placed square perforations under monotonic loading. Finite element models were developed for assessment of the buckling stability, stiffness, strength, and ductility performances of the shear walls. To this end, parametric studies were performed by considering the web-plate corrugation angle, thickness, and size of opening as the varying parameters in the nonlinear pushover analyses. It was found that the design of the boundary frame members can be effective in minimizing the deformations imposed by infill plates, providing system ductility, and developing lateral load resistance through stable development of diagonal tension-field action in the web plate. The effects of introducing web-plate perforations, and increasing the size of the opening, on the structural performance were also investigated. Proper design and detailing of the SPSW, along with optimal selection of the web-plate geometrical and corrugation parameters, can ensure desirable structural behavior and seismic performance for such lateral force-resisting systems.     

Introduction of stiffened large rectangular openings in steel plate shear walls

The nonlinear behavior of steel plate shear walls (SPSWs) with stiffened large rectangular openings used as windows or doors in buildings is studied. A number of SPSWs with and without openings are numerically analyzed, and the results are utilized (a) to characterize the behavior of SPSWs with the openings, (b) to study the effects of various opening features as well as size of local boundary elements (LBE) around the opening and thickness of infill plates on either side of the opening and (c) to investigate the changes in the system strength, stiffness and ductility due to the introduction of the openings. Results show that the procedure addressed by AISC Design Guide 20 for design of beams above and below the opening level is not perfect. Use of thicker or thinner infill plates or weaker profiles for the LBE can alter the yielding sequence in the system. Notably, the type, location and geometry of stiffened openings are not influential themselves on the system strength, although different LBE sizes required for different openings may have some effects. The introduction of stiffened openings in different SPSWs increases both the ultimate strength and stiffness, while somewhat decreases the ductility ratio.     

钢板剪力墙大矩形开孔的加固方法

对在建筑中作为门窗的钢板剪力墙的大矩形开孔加固的非线性性能进行研究。对一些开孔和未开孔的钢板剪力墙进行数值分析:1)用分析结果对开孔的钢板剪力墙的性能进行描述;2)研究开孔处局部边界梁结构的开孔特性、大小和开孔处任意边的填充板厚度所带来的影响;3)调查开孔所带来的系统强度和刚度的改变。结果显示,根据AISC20《钢结构设计规范》来解决开孔处上、下梁的设计并不完善。对局部边界梁结构使用略厚或略薄的内填充板将会改变整体的屈服顺序。显而易见,尽管不同开孔所需的不同局部边界梁结构的大小会对其有一定的影响,开孔加固的类型﹑位置﹑形状并不会影响整体强度。在不同的钢板剪力墙中使用开孔加固可以增加其极限强度和刚度,而略微减小延性比。     

Influences of the gravity loads on the cyclic performance of unstiffened steel plate shear wall

This paper is aimed at investigating the influences of gravity loads on the overall performance of the steel plate shear wall (SPSW) under the monotonic as well as cyclic loadings. A nonlinear finite‐element model for SPSWs was developed and verified using monotonic tests carried out by Behbahanifard and Drivers et al. and the three large‐scale three story cyclic test specimens (namely SC2T, SC4T and SC6T) carried out by Park et al.; very good predictions of the ultimate strengths, hysteresis properties and failure modes were obtained. Based on these three specimens tested by Park et al., nine more numerical SPSW specimens with the axial stresses of the boundary columns equal to 100 MPa, 200 MPa and 300 MPa were analyzed. The strength and tension strip angles under lateral monotonic loadings and the hysteresis properties and energy dissipation under lateral cyclic loadings were analyzed. Finally, the strength prediction method of the SPSWs with the flexure‐dominate behavior originally proposed by Park et al. was modified to account for the tension‐field action of the infill plates, and better prediction of the shear strength of the SPSW was obtained. Copyright © 2016 John Wiley & Sons, Ltd.     

Stress state of steel plate shear walls under compression–shear combination load

This paper investigates the stress state of the infill steel plate for the unstiffened steel plate shear walls (SPSWs) under compression–shear combination load. First, the infill steel plate is divided into three zones, the stress state of each zone under compression is derived, and the accuracy of the analytical model is verified by a series of numerical examples. Second, considering the combination effects of the gravity load and shear force from the adjacent boundary columns, the stress state of each zone is proposed and discussed. Then the shear capacity of the infill steel plate for the unstiffened SPSWs with gravity load acting on the top of the boundary columns is proposed. Finally, the shear capacity of 21 numerical SPSW specimens with various axial stresses of the boundary columns and different steel infill plate thicknesses is predicted.