带暗支撑低矮剪力墙抗震性能试验及承载力计算

提出了钢筋混凝土带暗支撑剪力墙 ,进行了 11个 1 3缩尺的低矮剪力墙模型的低周反复荷载试验 ,重点分析了暗支撑的倾角和配筋比对剪力墙抗震性能的影响 ,给出了带暗支撑剪力墙承载力的计算方法 ,计算结果与实测结果符合较好。提出了供抗震设计参考的建议     

内置型钢桁架高强混凝土中高剪力墙抗震性能试验研究

为了研究内置型钢桁架高强混凝土中高剪力墙的抗震性能,采用不同的暗柱类型及不同的暗柱和暗支撑型钢配钢率,设计制作了3片1/4缩尺、剪跨比1.8、混凝土强度等级为C70的内置型钢桁架高强混凝土中高剪力墙试件,对其进行水平往复加载试验,比较3片高强混凝土中高剪力墙试件的受力过程、破坏形态、滞回性能、位移延性以及侧向刚度退化特征。试验结果表明:内置型钢桁架高强混凝土中高剪力墙试件的最终破坏形态主要为弯曲型破坏,相比于普通高强混凝土中高剪力墙,其位移延性以及后期侧向刚度退化都有明显改善;增加暗柱型钢配钢率能提高试件的水平承载力,但会降低延性性能;增加暗支撑型钢配钢率能显著改善试件的延性,但承载力变化不明显,说明型钢暗支撑对改善高强混凝土中高剪力墙的抗震性能更为有效。     

设置暗支撑钢筋混凝土剪力墙的抗震性能试验研究

24片剪力墙缩尺模型试件按剪跨比1.0、1.5、2.0分为三组,每组试件中分别有普通剪力墙、设置型钢暗柱剪力墙、设置型钢暗支撑和钢筋支撑剪力墙,并对其进行了低周反复荷载作用抗震性能试验,探讨了设置暗支撑剪力墙的承载力、变形、刚度衰减、滞回曲线和破坏形态,并与普通剪力墙进行对比。试验表明,设置暗支撑剪力墙的开裂荷载和开裂位移与普通剪力墙相差很小,但极限承载力、极限位移显著增加,当λ=1.0、1.5、2.0时,极限承载力平均提高了44.0%、75.0%、37.0%,极限位移平均增加了26.0%、45.0%、46.0%,延性和耗能能力显著提高。研究表明,设置暗支撑的极限承载力与本文采用的计算模型计算结果吻合较好。暗支撑的设置明显提高了剪力墙的抗震性能。     

钢筋混凝土带暗支撑L形截面短肢剪力墙抗震性能试验研究

钢筋混凝土短肢剪力墙结构是一种新型的中高层住宅结构体系,已有较多的工程应用,但是短肢剪力墙的抗震性能较差,如何提高短肢剪力墙的抗震性能是目前工程界十分关注的问题。本文提出了带暗支撑短肢剪力墙结构,通过1/2缩尺的墙肢截面高厚比分别为5.0、6.5、8.0的3个L形截面带暗支撑短肢剪力墙和3个L形截面普通短肢剪力墙模型抗震性能试验的对比研究,分析了L形截面短肢剪力墙的破坏特征、承载力、刚度及其衰减过程、延性及滞回特性。试验表明,带暗支撑L形截面短肢剪力墙比普通L形截面短肢剪力墙的抗震性能明显提高。     

钢筋混凝土带暗支撑双功能低矮剪力墙抗震性能试验研究

本文提出了带暗支撑剪力墙,并将其与双功能剪力墙组合应用,通过6个1/3缩尺的低矮剪力墙模型的低周反复荷载试验,重点分析了不同设计型式剪力墙的承载力、刚度及其衰减过程、延性、耗能、滞回特性和破坏特征,给出了承载力计算方法,计算结果与实测值符合较好。加设暗支撑可明显改善低矮剪力墙的抗震性能。     

钢筋混凝土带暗支撑双肢剪力墙抗震性能试验研究

提出了一种新型钢筋混凝土延性双肢剪力墙,即带暗支撑双肢剪力墙,进行了3个四层双肢剪力墙1/4缩尺模型的抗震性能试验研究。较系统地分析了结构的刚度及其衰减过程,以及承载力、延性、耗能、破坏机制和破坏特征等。试验结果表明在连梁中加配交叉斜筋对提高承载力和延性效果显著,但对两道抗震防线的控制不太理想;两墙肢加设暗支撑后,两墙肢抗震能力明显增强,有明确的两道抗震防线,同时结构整体变形和耗能能力显著增强,带暗支撑双肢剪力墙的关键在于合理地控制了剪力墙的破坏机制。文中还建立了带暗支撑双肢剪力墙的力学模型、承载力计算公式,计算结果与实测值符合较好。     

带不同类型组合暗支撑剪力墙抗震性能试验研究

本文选取剪力墙结构体系中较为薄弱的抗震构件一字形截面剪力墙,采用不同类型的暗支撑进行了4个1/3缩尺的带暗支撑剪力墙构件的低周反复荷载试验,4个模型分别为普通剪力墙、带钢筋暗支撑剪力墙、带型钢暗支撑剪力墙、带钢筋-型钢暗支撑剪力墙。试验表明,带暗支撑剪力墙的主斜裂缝角度有明显向暗支撑的角度逼近的趋势,其裂缝细密且分布区域较大,墙体耗能能力较强。带暗支撑剪力墙比普通剪力墙底部塑性耗能区的高度显著增大。与普通剪力墙相比,带暗支撑剪力墙的屈服荷载、极限荷载明显提高,后期刚度稳定性较好,延性系数及耗能能力显著提高,滞回环饱满,抗震性能比普通剪力墙显著改善,特别是带钢筋-型钢组合暗支撑剪力墙的抗震性能提高最为显著。     

不同暗支撑型式的带暗支撑双肢剪力墙抗震性能试验研究

在已有钢筋混凝土带暗支撑双肢剪力墙研究的基础上,设计了3个不同暗支撑配筋型式的四层双肢剪力墙和1个普通四层双肢剪力墙1/4缩尺模型,并进行了在低周反复荷载作用下与普通双肢剪力墙的对比试验研究。较系统地分析了结构的承载力、延性、耗能、用钢量和破坏特征等。还建立了带暗支撑双肢剪力墙的力学模型、承载力计算公式,计算结果与实测值符合较好。     

再生骨料掺量对中高剪力墙抗震性能影响试验研究

为了研究不同再生骨料掺量、配筋形式的剪力墙抗震性能,进行5个中高剪力墙的低周反复荷载试验研究。在试验的基础上,分析各剪力墙的滞回特性、承载力、延性、刚度及其退化过程、耗能及破坏特征。研究表明:再生骨料掺量的增加,使再生混凝土中高剪力墙的抗震性能有所降低;钢筋混凝土格构暗支撑能明显改善再生混凝土中高剪力墙的抗震性能。经过合理设计,再生混凝土剪力墙可以满足建筑结构抗震要求。     

内藏钢桁架组合中高剪力墙的抗震性能

为了研究内藏钢桁架组合中高剪力墙的抗震性能,进行了6个1/3缩尺的中高剪力墙低周反复荷载试验,其中包括2个普通混凝土剪力墙、2个内藏钢框架混凝土剪力墙和2个内藏钢桁架混凝土剪力墙,轴压比分别是0.2、0.5。在试验研究基础上,对比分析了两种轴压比下各剪力墙的承载力、刚度、延性、滞回特性、耗能能力及破坏特征。试验及分析表明:在不同轴压比下,内藏钢桁架混凝土组合中高剪力墙的抗震性能比普通混凝土中高剪力墙的抗震性能显著提高;高轴压比下各剪力墙的承载力比低轴压比下相应剪力墙的承载力明显提高,但其延性及耗能能力降低。     

钢筋混凝土带暗支撑筒体抗震性能试验研究

钢筋混凝土筒体是高层建筑中最主要的抗侧力体系,目前对钢筋混凝土筒体的试验研究较少,且提高筒体抗震性能的措施研究方面更少。在暗支撑剪力墙研究的基础上,本文进一步提出了钢筋混凝土带暗支撑筒体,通过1个1/6缩尺的带暗支撑筒体与1个普通筒体的低周反复荷载试验,对比分析破坏特征、承载力、刚度、延性、滞回特性、耗能能力及钢筋应变。试验表明,与普通核心筒体相比,带暗支撑筒体的抗震耗能能力显著提高,抗震性能明显改善。     

Experimental study on seismic behavior of mid-rise RC shear wall with concealed truss

In this paper, mid-rise shear wall with concealed truss was proposed. This new composite shear wall includes two kinds of composition: one is the composition of two bearing systems, including truss and shear wall, and the other is the composition of two materials, including steel and concrete. Therefore, it is a double composite shear wall. The experimental study on the seismic behavior of six 1/3 scale mid-rise shear walls, including an ordinary mid-rise shear wall, a mid-rise shear wall with steel frame, and four mid-rise shear wall with concealed truss made of different materials, was studied. Based on the experimental study, the stiffness and its attenuation, bearing capacity, ductility, hysteretic property, energy dissipation, and failure phenomena of each shear wall were contrastively analyzed. The formulas of bearing capacity and stiffness were established. The results obtained from the formulas and those from experiment are in good agreement. Some suggestions for seismic design of shear wall are given in this paper. The experimental results show that the seismic behavior of the mid-rise shear wall with steel frame and that of every truss with different materials is obviously improved.     

Experimental study on seismic behavior of mid-rise RC shear wall with concealed truss

In this paper, mid-rise shear wall with concealed truss was proposed. This new composite shear wall includes two kinds of composition: one is the composition of two bearing systems, including truss and shear wall, and the other is the composition of two materials, including steel and concrete. Therefore, it is a double composite shear wall. The experimental study on the seismic behavior of six 1/3 scale mid-rise shear walls, including an ordinary mid-rise shear wall, a mid-rise shear wall with steel frame, and four mid-rise shear wall with concealed truss made of different materials, was studied. Based on the experimental study, the stiffness and its attenuation, bearing capacity, ductility, hysteretic property, energy dissipation, and failure phenomena of each shear wall were contrastively analyzed. The formulas of bearing capacity and stiffness were established. The results obtained from the formulas and those from experiment are in good agreement. Some suggestions for seismic design of shear wall are given in this paper. The experimental results show that the seismic behavior of the mid-rise shear wall with steel frame and that of every truss with different materials is obviously improved.     

底层大空间带暗支撑剪力墙结构振动台试验研究

进行了2个1/8缩尺的底层大空间部分框支剪力墙结构模型(其中一个模型的两片落地剪力墙配有暗支撑)的振动台试验,试验结构经历了弹性阶段、开裂直至破坏全过程,研究了结构在各个阶段的动力特性变化及动力反应,比较了两个结构模型的破坏形态,进行了弹性和非线性有限元时程反应分析。试验及分析结果表明,在混凝土开裂前的弹性阶段,带暗支撑剪力墙结构的抗震性能与普通剪力墙结构基本相同;在混凝土开裂后的弹塑性阶段,带暗支撑剪力墙结构的结构抗力明显大于普通剪力墙结构的结构抗力,带暗支撑剪力墙结构模型的底层最大层间位移反应比普通剪力墙结构模型的底层最大层间位移反应显著减小,带暗支撑剪力墙与普通剪力墙的破坏形态不同,带暗支撑剪力墙底部塑性铰区的高度显著大于普通剪力墙底部塑性铰区的高度。