Analysis and seismic tests of composite shear walls with CFST columns and steel plate deep beams

A composite shear wall concept based on concrete filled steel tube （CFST） columns and steel plate （SP） deep beams is proposed and examined in this study. The new wall is composed of three different energy dissipation elements： CFST columns; SP deep beams; and reinforced concrete （RC） strips. The RC strips are intended to allow the core structural elements - the CFST columns and SP deep beams - to work as a single structure to consume energy. Six specimens of different configurations were tested under cyclic loading. The resulting data are analyzed herein. In addition, numerical simulations of the stress and damage processes for each specimen were carried out, and simulations were completed for a range of location and span-height ratio variations for the SP beams. The simulations show good agreement with the test results. The core structure exhibits a ductile yielding mechanism characteristic of strong column-weak beam structures, hysteretic curves are plump and the composite shear wall exhibits several seismic defense lines. The deformation of the shear wall specimens with encased CFST column and SP deep beam design appears to be closer to that of entire shear walls. Establishing optimal design parameters for the configuration of SP deep beams is pivotal to the best seismic behavior of the wall. The new composite shear wall is therefore suitable for use in the seismic design of building structures.

Seismic performance evaluation of steel frame-steel plate shear walls system based on the capacity spectrum method

This paper presents some methods that the standard acceleration design response spectra derived from the present China code for seismic design of buildings are transformed into the seismic demand spectra, and that the base shear force-roof displacement curve of structure is converted to the capacity spectrum of an equivalent single-degree-of-freedom (SDOF) system. The capacity spectrum method (CSM) is programmed by means of MATLAB7.0 computer language. A dual lateral force resisting system of 10-story steel frame-steel plate shear walls (SPSW) is designed according to the corresponding China design codes. The base shear force-roof displacement curve of structure subjected to the monotonic increasing lateral inverse triangular load is obtained by applying the equivalent strip model to stimulate SPSW and by using the finite element analysis software SAP2000 to make Pushover analysis. The seismic performance of this dual system subjected to three different conditions, i.e. the 8-intensity frequently occurred earthquake, fortification earthquake and seldom occurred earthquake, is evaluated by CSM program. The excessive safety of steel frame-SPSW system designed according to the present China design codes is pointed out and a new design method is suggested.

Lateral load-carrying capacity analyses of composite shear walls with double steel plates and filled concrete with binding bars

A method is developed to predict the lateral load-carrying capacity of composite shear walls with double steel plates and filled concrete with binding bars(SCBs). Nonlinear finite element models of SCBs were established by using the finite element tool, Abaqus. Tie constraints were used to connect the binding bars and the steel plates. Surface-to-surface contact provided by the Abaqus was used to simulate the interaction between the steel plate and the core concrete. The established models could predict the lateral load-carrying capacity of SCBs with a reasonable degree of accuracy. A calculation method was developed by superposition principle to predict the lateral load-carrying capacity of SCBs for the engineering application. The concrete confined by steel plates and binding bars is under multi-axial compression; therefore, its shear strength was calculated by using the Guo-Wang concrete failure criterion. The shear strength of the steel plates of SCBs was calculated by using the von Mises yielding criterion without considering buckling. Results of the developed method are in good agreement with the testing and finite element results.

Experimental and analytical study on seismic behavior of steel-concrete multienergy dissipation composite shear walls

In this paper, a steel-concrete multi-energy dissipation composite shear wall, comprised of steel-reinforced concrete （SRC） columns, steel plate （SP） deep beams, a concrete wall and energy dissipation strips, is proposed. In order to study the multi-energy dissipation behavior and restorability after an earthquake, two stages of low cyclic loading tests were carded out on ten test specimens. In the first stage, test on five specimens with different number of SP deep beams was carried out, and the test lasted until the displacement drift reached 2%. In the second stage, thin SPs were welded to both sides of the five specimens tested in the first stage, and the same test was carried out on the repaired specimens （designated as new specimens）. The load-bearing capacity, stiffness, ductility, hysteretic behavior and failure characteristics were analyzed for both stages and the results are discussed herein. Extrapolating from these results, strength calculation models and formulas are proposed herein and simulations using ABAQUS carried out, they show good agreement with the test results. The study demonstrates that SRC columns, SP deep beams, concrete wall and energy dissipation strips cooperate well and play an important role in energy dissipation. In addition, this study shows that the shear wall has good recoverability after an earthquake, and that the welding of thin SP＇s to repair a deformed wall is a practicable technique.

Numerical modeling of seismic behavior of ellipse and peanut‑shaped auxetic steel plate shear walls

本文提出了一种新型负泊松比钢板剪力墙(ASSPSW),主要由边缘构件和内置的开孔填充板组成,边缘构件之间连接形式采用铰接。填充板的开孔形式包括正交椭圆型(ASSPSW-OE)和正交花生型(ASSPSWOP)两种负泊松比构型。本文基于有限元分析方法,针对两类钢板剪力墙,开展了钢板剪力墙(SPSW)抗震性能研究,分析了开孔大小、孔距等参数对SPSW滞回性能的影响规律。研究结果表明,对于正交椭圆型SPSW,减小胞体间距与椭圆长径比值(t/D)可以有效增大孔隙率,但降低了承载力和耗能能力。在保持t/D不变的情况下,增大椭圆短径与长径比值(d/D)不仅可以增加开孔率,而且SPSW承载能力和耗能能力并未出现明显降低。对于正交花生型SPSW,开孔的几何参数对于滞回性能都有较大影响,特别的是,增大形成花生型胞体大圆与小圆的半径比值(R/r),胞体之间的间距减小。当SPSW层间位移角超过2%时,等效粘滞阻尼比出现剧烈下降。与正交椭圆型不同的是,改变花生型胞体排布的角度对于正交花生型影响不明显,但是角度越大,正交椭圆型SPSW发生较大平面外屈曲从而降低耗能能力。相同点在于较大的胞体排布角度会使得钢板拥有完整的应力场,承载力会稍有提升,在胞体布置角度为45°时,可使得SPSW获得较大的初始刚度。

联肢弯剪型钢板剪力墙抗震性能试验研究

联肢钢板剪力墙结构是将2片钢板剪力墙通过钢连梁连接形成的抗侧力结构。通过对1榀1/3缩尺的4层联肢弯剪型钢板剪力墙试件进行低周往复加载试验,从滞回曲线、骨架曲线、延性、承载力及刚度退化、耗能能力等方面研究了该结构体系的抗震性能,并且对试件的屈服顺序和变形模式进行了分析。结果表明:联肢钢板剪力墙试件的延性系数达到5.03,承载力退化系数均大于0.96,承载力和刚度退化稳定,等效黏滞阻尼系数达到0.25以上,表明联肢弯剪型钢板剪力墙具有优越的抗震性能。加载过程中,连梁先于墙板发生屈服,墙板先屈曲后屈服,此后柱脚和横梁相继屈服。连梁的引入改变了结构的屈服机制,提高了整体的延性和耗能能力,能够组成多道抗震防线,且试件整体最终也体现出合理的破坏机制。整体侧移曲线呈弯剪变形模式。该试验研究更加贴合实际工程中联肢钢板剪力墙结构的应用情况,为联肢钢板剪力墙结构的进一步研究和应用提供了试验基础。

HPC端部加强双钢板组合剪力墙的抗震性能

为研究高性能混凝土端部加强双钢板组合剪力墙受力机理及破坏形态,以轴压比、腹部普通混凝土强度等级为关键参数,设计了4片普通试件,7片HPC端部加强试件,运用ABAQUS构建其有限元模型,研究其抗震性能。结果表明:同轴压比下,HPC端部加强试件相比普通试件屈服荷载提高16.30%,峰值荷载提升13.40%;随着轴压比提高,HPC端部加强试件峰值荷载和屈服荷载分别提高7.22%和2.72%,随着轴压比减小,HPC端部加强试件延性提升22.26%;提高腹部腔体混凝土强度等级,HPC端部加强试件的屈服荷载和峰值荷载分别提高13.01%和11.14%,延性提升16.91%。

窄翼缘异形柱-波纹钢板剪力墙体系的抗震性能

针对钢结构住宅凸梁、凸柱和抗侧刚度不足的问题,提出一种新型窄翼缘异形柱-波纹钢板剪力墙体系;通过与传统H形钢柱-平钢板剪力墙体系进行对比,确定内嵌波纹钢板布置方式,采用ABAQUS软件建立所提出体系的有限元模型,对所提出体系的抗震性能进行分析,探讨外部框架截面形式与布置方式、波纹钢板厚度与剪跨比等对所提出体系的抗侧承载力、耗能能力和塑性变形能力的影响。结果表明:所提出的体系具有较大的抗侧承载力和较强的耗能能力、塑性变形能力,极限抗侧承载力为设计值的1.73倍,具备一定的安全储备;横向布置的波纹钢板能有效减小其作用于框架梁柱的荷载;采用十字形异形柱使所提出的体系有更强的塑性变形能力;所提出体系中的异形柱偏肢宜沿剪力墙面内方向布置,内嵌波纹钢板厚度宜取为3~5 mm,剪跨比宜控制在1.25左右。

焊接多腔双钢板-混凝土组合剪力墙抗震性能分析

大多数双钢板-混凝土组合剪力墙采用螺栓连接或焊接肋的方式使钢板和混凝土协同工作。然而,这种连接方式可能导致整体性和塑性变形效率较低,且制作复杂,焊接多腔双钢板-混凝土组合剪力墙能够有效地避免这些问题。为了深入研究焊接多腔双钢板-混凝土组合剪力墙的抗震性能,基于约束混凝土真三轴塑性-损伤本构模型和钢材弹塑性混合强化-韧性损伤本构模型,建立了组合剪力墙的精细化三维实体-壳模型,将模拟所得的滞回曲线、骨架曲线、刚度退化曲线、弹性刚度、承载力、累积耗能、等效阻尼粘滞系数和延性系数与已有拟静力试验结果相比较,发现两者吻合较好。分析结果表明:轴压比对组合剪力墙模型算例刚度和承载力的影响较小,而随剪跨比增大,组合剪力墙模型算例的刚度和承载力呈线性降低;轴压比对组合剪力墙模型算例总塑性耗能的影响较小,而剪跨比的影响较大,剪力墙总塑性耗能随剪跨比增大而降低;轴压比和剪跨比都不会改变算例各部件的耗能分配机制,即组合剪力墙模型算例以外钢板和内隔板耗能为主。

两边连接木盖板屈曲约束钢板剪力墙抗侧力性能试验研究

从环保角度提出一种钢木组合形式的两边连接防屈曲钢板剪力墙。基于已有的研究成果,设计两个试件,一个是没有木盖板约束的钢板剪力墙,另一个是覆盖木板作为钢板面外屈曲约束的钢板剪力墙。对试件采用位移控制加载方式进行拟静力试验,得到试件的滞回曲线。根据试验结果,分析了试件的骨架曲线、刚度退化和耗能能力。试验结果表明,木盖板抑制钢板屈曲效果较好,能够有效减小鼓曲声音;与无木盖板试件相比,有木盖板试件具有更高的承载力和更强的耗能能力。在试件破坏后,对试件进行拆卸,发现钢板腹部木盖板覆盖区域能够保持平整,拆卸后的木盖板在加载后也能保持完整。采用软件ABAQUS进行有限元分析,模拟结果和试验结果吻合,验证了模型的可行性。

钢板混凝土剪力墙拉弯剪性能试验研究

超高层建筑“细柔”特征容易引起底部剪力墙在强震下处于拉-弯-剪复合受力状态,中国《超限高层建筑工程抗震设防专项审查技术要点》(建质[2015]67号)建议墙肢采用配置型钢/钢板的方式来改善该种抗震性能,但缺乏相关试验研究。为此,进行了6片钢板混凝土剪力墙的低周往复荷载试验,研究了轴拉比、含钢率及剪跨比对墙肢拉弯剪性能的影响。研究表明:拉弯剪作用引起钢板混凝土剪力墙密集的裂缝分布和显著的钢材强化,并导致其剪切-拉弯耦合破坏。轴拉比增大,墙肢承载力、初始抗侧刚度和延性分别降低22%、41%和39%;剪跨比减小,墙肢承载力和抗侧刚度至少提升23%;同时增大含钢率和降低剪跨比,墙肢延性提高10%。相比其他国家规范,中国规范对拉弯剪作用下钢板混凝土剪力墙的抗剪承载力预测效果更好,但其未能考虑高含钢率对裂面销栓力的影响,故建议采用暗柱的初始含钢率进行修正。

轴压荷载作用下双钢板-混凝土组合剪力墙中钢板屈曲性能研究

双钢板-混凝土组合剪力墙作为建筑物中的抗侧力构件,具有承载力高、耗能能力强和延性好等优点。在高层和超高层建筑结构中,双钢板-混凝土组合剪力墙需要承担一定的竖向荷载,钢板在正常使用阶段要求不发生弹性屈曲。钢板初始几何缺陷是影响双钢板-混凝土组合剪力墙轴压荷载下钢板屈曲应力的重要指标,而在以往的研究中,钢板屈曲应力的计算方法并未予以考虑。基于前期的双钢板-混凝土组合剪力墙轴压试验研究,采用分析软件ABAQUS建立了双钢板-混凝土组合剪力墙轴压试件有限元模型,模型中引入了钢板的初始几何缺陷,从钢板屈曲应变、荷载-位移曲线和破坏模态等方面与试验结果进行对比,验证了模型分析结果的合理性。在此基础上进行参数分析,系统研究了钢板初始几何缺陷、钢板距厚比和钢材屈服强度等参数对钢板屈曲性能的影响规律,基于试验和数值模拟分析结果,提出了考虑钢板初始几何缺陷影响的双钢板-混凝土组合剪力墙钢板屈曲应力计算方法。

带PEC柱钢板剪力墙结构(弱轴连接)抗震性能有限元分析

为研究边缘柱为部分外包混凝土组合柱的钢板剪力墙结构(弱轴连接)的抗震性能,使用有限元软件ABAQUS完成1榀边缘柱为H型钢柱、5榀边缘柱为PEC柱的钢板剪力墙结构(弱轴连接)在循环荷载作用下的有限元数值模拟,得到结构的应力分布、破坏模式、滞回曲线、耗能性能、骨架曲线以及刚度退化曲线,并完成了1榀带PEC柱的钢板剪力墙结构(弱轴连接)的试验,验证了有限元模拟的正确性.分析表明在钢板剪力墙结构中(弱轴连接),将PEC柱作为剪力墙的边缘框架柱,同样可以很好的约束屈曲后的钢板剪力墙,使其充分发挥屈曲后的性能,显著提升整体结构的抗侧刚度、承载力以及耗能性能.

三边连接K形屈曲约束钢板墙受力性能研究

为解决三边连接屈曲约束钢板墙在自由边两个角部首先发生破坏的问题,文中提出了一种新型三边连接K形屈曲约束钢板墙。采用ABAQUS有限元软件对三边连接矩形和K形屈曲约束钢板墙进行受力性能分析,获得了屈曲约束钢板墙的屈服荷载、初始刚度、荷载位移曲线、塑性应变分布和屈服区分布。结果表明K形屈曲约束钢板墙的屈服荷载、初始刚度以及荷载位移曲线与矩形屈曲约束钢板墙相差不大,但在延性和耗能能力方面表现更佳。最后,提出了形式简洁计算精度较高的该类新型屈曲约束钢板墙的理论计算公式,可为K形屈曲约束钢板墙的工程设计提供参考。

钢板-混凝土组合剪力墙裂缝控制及监测分析

以实际工程为背景,对1.7 m厚钢板-混凝土组合剪力墙的裂缝控制及监测进行分析。大体积混凝土构件,由于其水化热比较高容易产生温度裂缝,基于此首先对原材料及配合比进行优化设计,降低混凝土水化热。然后对大厚度组合剪力墙浇筑后采取合理的养护措施控制其内部温度以及对裂缝发生情况进行实测分析,最后经过一系列针对性的裂缝控制措施及监测结果表明,采用优化设计对大厚度组合剪力墙的裂缝控制优于同类工程的裂缝控制效果。

纤维增强钢复合板剪力墙力学性能研究

为了提升钢板剪力墙的力学性能,文中主要对不同纤维粘贴方式下纤维复合板剪力墙的拉伸、压缩及弯曲性能进行研究。结果表明,与纯钢板相比,水平纤维钢板的极限拉伸荷载、极限压缩荷载以及极限弯曲荷载分别增加32.5%、43.3%及67.8%。垂直纤维钢板与纯高强钢板的刚度值基本一致,而水平纤维钢板的拉伸刚度较纯高强钢板高21.5%,压缩刚度较纯高强钢板高27.2%,弯曲刚度较纯高强钢板高114.3%,耗散能能量为38.2 kJ。与钢板墙相比,水平纤维增强钢复合板剪力墙耗散能力提升16.3%,初始刚度提升14.6%。

超高层核心筒异形超厚钢板剪力墙施工技术分析

文中以某超高层建筑项目为例,探析了超高层核心筒异形超厚钢板剪力墙施工技术,采用BIM技术模拟深化,以优化安装顺序、焊接工艺流程,并对焊缝变形提出有效的控制措施。结果表明,除外观质量外,其余检查项目合格率均超过95%,符合国家规范要求,表明该技术方案能够取得良好的应用效果。

双向加劲肋钢板剪力墙深化设计与施工技术

通过工程实例,讲述双向加劲肋钢板剪力墙施工技术。重点介绍利用BIM模型对钢板剪力墙进行分段,确定各段加工尺寸及吊装、焊接加固顺序,施工前通过对进场构件尺寸核对、现场安装尺寸调整、焊接工艺复核等,有效地保证了钢板剪力墙施工质量。通过对工程实例中钢板剪力墙的分析、设计方案以及施工问题的探讨,为钢板剪力墙的施工处理提供了一定的借鉴作用。

组合钢板剪力墙分层浇筑模拟及温度场分析

由于雄安新区创新研究院科研园区项目钢板混凝土组合剪力墙高度较高,并且要求普通混凝土强度等级达到C50及以上,混凝土下落高度过大,易产生离析现象,影响工程质量,所以采取逐层浇筑、逐层振捣的施工方式进行模拟。该方法下,墙体温度场无法通过理论计算得出,故基于ABAQUS2021进行有限元模拟,编写Hetval子程序对混凝土水化放热过程进行精确模拟,得到了分层浇筑措施下组合钢板剪力墙的混凝土水化放热温度场,为工程顺利完工交付提供了技术支持。