混凝土密柱石膏复合墙板结构性能及简化分析模型

对混凝土密柱石膏复合墙板的水平剪力传递机理进行分析,发现石膏板肋能有效地在混凝土芯柱间传递水平剪力,对复合墙板结构性能有较大影响。在此基础上,提出混凝土密柱石膏复合墙板的等效带缝剪力墙简化分析模型,剪力墙竖缝布置以保证等效带缝剪力墙与复合墙板具有相同弹性抗侧刚度为原则确定。对混凝土密柱石膏复合墙板及等效带缝剪力墙的结构性能进行比较分析表明,混凝土密柱石膏复合墙板与带缝剪力墙受力机理相似,等效带缝剪力墙弹性及塑性阶段都能很好地反映混凝土密柱石膏复合墙板的结构性能。     

钢框架内嵌带竖缝钢筋混凝土剪力墙的内力计算模型

对《高层民用建筑钢结构技术规程》(JGJ 99—98)中钢框架内嵌带竖缝钢筋混凝土剪力墙的等效交叉支撑和等效剪切板模型进行考察,指出了在确定等效构件时考虑钢框架梁剪切变形的必要性,同时指出两种模型均不能正确地给出钢框架梁的剪力,也不能反映钢框架梁弯曲变形对整体刚度的影响。因此提出壁式框架的计算模型,对各部分的刚度给出了计算建议,对模拟钢框架内嵌带竖缝钢筋混凝土剪力墙肢的壁柱,通过对轴压刚度取小值以实现带竖缝钢筋混凝土剪力墙不承担竖向荷载的设计要求。对壁式框架模型和两种等效模型进行比较表明,在层数少、剪切变形占主导地位时,壁式框架模型的刚度略小;层数增加,三种模型结果相似。但壁式框架模型能够给出钢框架梁的剪力,并反映钢框架梁变形对抗侧刚度的影响。     

论带竖缝钢筋砼结构中的剪力墙的设计

带竖缝的钢筋混凝土剪力墙是抗震区采用的一种抗侧力结构,由于设置了竖缝,剪力墙的抗侧刚度大大减弱,克服了现浇整体剪力墙整体刚度大、地震力大的缺点。本文对钢框架带竖缝剪力墙结构中梁端承载力、墙板与钢梁连接件、钢梁腹板以及墙板预埋件的设计计算进行考察,提出为实现竖缝剪力墙的设计原则而引人的补充设计规定。     

钢筋混凝土剪力墙板的剪切滞回性能试验研究

为提高低矮钢筋混凝土剪力墙板的数值模拟精度,完善混凝土在循环荷载作用下的剪切本构理论,进行6个钢筋混凝土剪力墙板的循环剪切试验,研究配筋率及钢筋角度对钢筋混凝土剪力墙板在循环剪切应力作用下滞回性能及累积耗能能力的影响,得到试件的滞回曲线、骨架曲线、延性、刚度退化、累积耗能能力等。试验结果表明：所有试件均发生剪切破坏模式。配筋率对钢筋混凝土剪力墙板的抗剪承载力有一定影响,对其变形能力影响不明显。钢筋角度对钢筋混凝土剪力墙板的滞回曲线有显著影响,分布钢筋与剪力墙剪切斜裂缝夹角越小,其滞回曲线越饱满,累积塑性剪切角、累积延性比、等效黏滞阻尼比及累积塑性耗能系数越大,但其初始剪切刚度反而越低。该文的试验结果可为完善混凝土的本构理论提供参考。     

带缝钢板剪力墙弹塑性简化分析模型

基于带缝钢板剪力墙的基本受力特点和变形特征,提出了一种弹塑性简化分析模型,并分别定义了模型的几何参数与非线性参数。为验证简化模型的正确性,分别对带缝钢板剪力墙以及钢框架带缝钢板剪力墙结构进行Pushover分析。分析结果表明：简化模型计算得到的荷载位移曲线与试验及有限元分析结果较为接近,可反映带缝钢板剪力墙的主要受力特征;简化模型可较为准确地反映协同工作时墙板对周边框架的附加作用力。     

改善高强混凝土剪力墙抗震性能的试验研究

通过四片高强度混凝土剪力墙试件）有整体墙和墙板中开竖缝墙）在低周反复荷载作用下的试验，研究开竖缝数量及长度（即墙板柱的剪跨比）对剪力墙的刚度、载力、延性、能耗、破坏形态等抗震性能的影响，结果表明，在剪力墙板中合理地设置竖缝，可使其弹性刚度、承载力变化不大的情况下，较大幅度地提高它的延性，塑性变形和耗能力。     

低周反复荷载作用下带竖缝高强混凝土剪力墙承载力研究

通过对4片高强混凝土剪力墙试件(有整体墙和在墙板中开竖缝墙)在竖向力和低周反复水平荷载作用下的试验研究,探讨了开竖缝对墙板水平承载力的影响,并根据带竖缝剪力墙的受力特点和试验结果,建立带竖缝墙的承载力计算模型,导出其实用的设计计算公式,给出了初步的设计建议,为工程设计和进一步研究提供参考。     

钢筋混凝土空心剪力墙抗震性能分析

通过对普通钢筋混凝土剪力墙、钢筋混凝土空心剪力墙及钢筋混凝土带缝空心剪力墙等不同形式的剪力墙板的试验，对这几种墙板的承载力、变形特征、延性、截面钢筋的应变情况及耗能能力进行了比较。     

开缝钢板墙抗震性能的试验研究

为了研究开缝形式对开缝钢板墙抗震性能的影响,完成了6组共12片1∶4比例的开缝钢板墙试件的往复加载试验。试验结果表明:开单层竖缝钢板墙的屈曲形态是竖缝间板带的单独扭转屈曲形态(第一类屈曲形态),屈服与破坏集中在竖缝的端部,造成竖缝间板带逐渐断裂,导致试件的刚度与承载力逐渐下降,滞回曲线出现剪切滑移现象;开双层竖缝钢板墙的屈曲是板内对角方向形成斜拉带的整板屈曲形态(第二类屈曲形态),到剪切位移角超过4%,试件的承载力没有出现下降,且滞回曲线相对饱满;竖缝间板带的长宽比越大,试件的抗侧刚度与屈服承载力越低;与开单层竖缝试件相比,开双层竖缝墙板的抗侧刚度与屈服承载力均明显提高。建议的试件初始刚度和承载力理论计算结果与试验得到的结果基本一致。     

提高钢筋混凝土空心剪力墙抗震性能的对比性研究

通过对空心剪力墙板、带翼缘和带缝空心剪力墙板的1/2模型的低周反复荷载试验研究,对比分析了这几种不同形式的空心剪力墙板的承栽力、变形性能、延性以及耗能能力.     

整体式与带缝分体式空心RC剪力墙抗震性能试验研究

进行了四个整体式及四个带缝分体式空心钢筋混凝土剪力墙试件在低周反复水平荷载下的试验,研究了试件的承载力、刚度及衰减过程、延性、耗能性能、滞回特性、破坏特征、钢筋的应变情况。结果表明:整体式空心剪力墙的裂缝分布形态主要以剪切斜裂缝为主,呈现出剪切破坏形态;带缝分体式空心钢筋混凝土剪力墙以弯剪裂缝为主,呈现出延性的弯剪破坏形态;改变带缝空心钢筋混凝土剪力墙竖缝两侧暗柱配筋,可使墙体抗剪承载力不降低而其延性与变形能力得到提高。     

Nonlinear hysteretic behavior simulation of reinforced concrete shear walls using the force analogy method

Reinforced concrete (RC) shear walls that provide high strength and stiffness are widely used in buildings to resist lateral loads. It often exhibits complex and multiple hysteretic behaviors, including shear behavior, flexural behavior, strength softening, and deterioration, which are often influenced by the reinforcement and concrete material characteristics, vertical loads, and so on. Significant effort has gone toward developing accurate and efficient models, and these models fall into two categories: macroscopic and microscopic models. The microscopic models are accurate but computationally expensive and need more material information and experimental results for calibration. The present research is to implement an existing macroscopic model for use in the force analogy method, which is an accurate, efficient, and stable algorithm for conducting dynamic analysis when coupled with the state space formulation. The RC shear wall model with two vertical sliding hinges and one horizontal sliding hinge assigned to capture the relationship of the lateral deflection or rotation versus the RC shear wall force is validated against prior experimental results. The proposed model is also implemented in a frame, in which inelastic response occurs in both the frame and the RC shear wall members, to demonstrate the application of the model and the potential for simulating complex inelastic dynamic RC frame‐wall structural behavior with the force analogy method. Copyright © 2014 John Wiley & Sons, Ltd.     

钢筋混凝土剪力墙剪切刚度计算的斜向腹筋桁架-拱模型

钢筋混凝土剪力墙构件腹板为双向配筋,其剪切刚度的传统计算方法忽略竖向钢筋的作用,低估了剪力墙构件的剪切刚度和受剪承载力。为考虑双向配筋对剪力墙剪切刚度的影响,提出等效斜向腹筋桁架-拱模型,与传统桁架-拱模型不同,模型中桁架作用的腹杆由斜向等效受拉钢筋及斜裂缝间的混凝土斜压杆构成,斜向等效钢筋的方向与裂缝处两个方向钢筋的合力方向一致。采用最小能量原理推导了斜向压杆倾角的理论算式,在已有试验数据的基础上,对压杆角度理论算式进行简化,提出了便于工程应用的简化算式。斜向开裂后剪力墙的有效剪切刚度为斜向腹筋桁架模型剪切刚度与拱模型剪切刚度的叠加,采用该模型分别对现有的剪力墙试件进行计算,并将计算值与实测值进行了比较,结果表明,提出的斜向腹筋桁架-拱模型可以较为准确地计算钢筋混凝土剪力墙构件斜向开裂后的有效剪切刚度。     

带缝钢筋砼剪力墙的非线性地震反应分析

对作者提出的一种抗震自控结构——带竖缝剪力墙作了非线性地震反应分析.分析中运用了具有足够精度的带缝剪力墙结构的简化计算模型,使计算大大简化而结果的可靠性不减,旨在考察带缝剪力墙的实际动力反应和抗震自控效果.计算结果表明,带缝剪力墙中缝槽间连梁的不断屈服能明显减弱整体结构的动力反应;而且通过设计连梁的屈服强度值,能优化控制带缝剪力墙的地震反应.     

Experimental Study on Low Cyclic Loading Tests of Steel Plate Shear Walls with Multilayer Slits

A new type of earthquake-resisting element that consists of a steel plate shear wall with slits is introduced. The infill steel plate is divided into a series of vertical flexural links with vertical links. The steel plate shear walls absorb energy by means of in-plane bending deformation of the flexural links and the energy dissipation capacity of the plastic hinges formed at both ends of the flexural links when under lateral loads. In this paper, finite element analysis and experimental studies at low cyclic loadings were conducted on specimens with steel plate shear walls with multilayer slits. The effects caused by varied slit pattern in terms of slit design parameters on lateral stiffness, ultimate bearing capacity and hysteretic behavior of the shear walls were analyzed. Results showed that the failure mode of steel plate shear walls with a single-layer slit was more likely to be out-of-plane buckling of the flexural links. As a result, the lateral stiffness and the ultimate bearing capacity were relatively lower when the precondition of the total height of the vertical slits remained the same. Differently, the failure mode of steel plate shear walls with multilayer slits was prone to global buckling of the infill steel plates; more obvious tensile fields provided evidence to the fact of higher lateral stiffness and excellent ultimate bearing capacity. It was also concluded that multilayer specimens exhibited better energy dissipation capacity compared with single-layer plate shear walls.     

预制装配式钢筋混凝土一体化剪力墙抗震性能研究及构造方案优化

针对预制装配式剪力墙结构,提出了内置空心管的混凝土填充墙与实体剪力墙墙肢一同浇筑生产、安装施工的预制一体化剪力墙结构。通过5个外形尺寸、墙肢和连梁配筋相同的混凝土双肢剪力墙的拟静力试验,探究了无填充、砌块砌体填充和一体化整体填充的剪力墙抗震性能,总结了这三类墙体的破坏形态、受力特点、承载与变形能力、刚度、延性和耗能能力的特点。试验结果表明：预制一体化剪力墙在水平往复荷载作用下发生弯剪破坏,相比于无填充墙试件和砌体填充试件,其抗侧刚度和受剪承载力有明显提高,同时具有良好的抗震性能。最后,基于OpenSEES平台对拟静力试验结果进行了有限元验证,得到了吻合程度较好的滞回曲线、骨架曲线及墙肢纵筋应变;根据试验结果与有限元分析,提出了预制一体化混凝土剪力墙结构合理的填充墙构造方案。     

足尺水泥聚苯模壳格构式混凝土填充墙钢筋混凝土框架抗震性能试验研究

为研究水泥聚苯模壳(EPSC)格构式混凝土填充墙钢筋混凝土(RC)框架的抗震性能,对一足尺单层EPSC格构式混凝土填充墙RC框架模型进行了振动台试验。试验中考虑了墙体开洞及墙体与RC框架的连接方式,研究了不同强度地震动作用下模型结构的动力特性、加速度反应、位移反应、层间剪力和动应变反应。研究结果表明：连续强震动作用下EPSC裂缝数量较多,部分格构柱水平开裂,而RC框架未发现损伤,EPSC格构式混凝土填充墙RC框架具有良好的抗震性能;模型最大层间位移角仅为1/513,格构式混凝土墙体的存在极大增强了RC框架的抗侧刚度;墙体与RC框架设置不同间距、长度的拉结筋均能提高墙体的平面外稳定性能,可控制墙体与框架协同工作。     

Bilinear Load–Displacement Curve of Semi-supported Steel Shear Walls

Elastic stiffness and ultimate shear capacity are two main parameters of a structural system to obtain its ideal bilinear load–displacement. In the previous studies, the ultimate shear capacity of semi-supported steel shear walls (SSSW) which are a new lateral resisting system, has been determined. In this system, wall plates do not have any direct connection to the main columns of structure and they are connected to secondary columns which do not carry the gravity loads. The used thin plate in the SSSW elastically buckles at low levels of lateral loads and the wall plate stays on a fairly vast region with elastic post-buckling behavior (elastic stiffness). In this study, the Von-Karman plate equations are solved by the Galerkin method to find displacement field of the wall plate in the elastic post-buckling region as well as the maximum shear load after which the plasticity expand in the wall plate. Thus, the elastic stiffness of system is calculated. As the analytical procedure is complicated, the method is applied on 144 examples with different material and geometrical properties. Using linear regression technique, a concise formula is proposed to predict the elastic stiffness of system. The dimensions of wall plate are only the effective parameters in the suggested formula and the elastic stiffness is independent of the overturning moment, section of secondary columns and yield stress of material. Using the ultimate shear capacity and elastic stiffness, an ideal bilinear curve is obtained for the lateral load versus the horizontal displacement. The shear capacity at the end of elastic post-buckling region and out of plane displacement are acceptably validated with those of FE analysis for some examples.     

高轴压比钢骨混凝土剪力墙抗震性能试验研究

为研究高轴压比钢骨混凝土剪力墙的抗震性能,完成了6片剪跨比为2.43、轴压比试验值为0.33~0.35的钢筋、钢骨和钢管混凝土剪力墙试件的往复水平力加载试验。试验表明:试件的纵筋和钢骨(钢管)受压屈服先于受拉屈服。试件的破坏形态为底部混凝土压碎剥落,约束边缘构件内的纵筋和钢骨(钢管)压曲,试件丧失竖向承载力。钢骨和钢管提高了试件的正截面承载力,且随位移增大试件能稳定地保持最大承载力。配置工字钢、槽钢和方钢管的试件的极限位移角为1/73~1/59,与钢筋混凝土试件基本相同;配置圆钢管的试件的极限位移角达1/44,墙端约束边缘构件配置圆钢管对提高高轴压比剪力墙的变形能力有显著作用。根据试验结果,提出了高轴压比钢骨混凝土剪力墙屈服、承载力极限状态和变形极限状态的截面应变、应力分布,建立了正截面承载力的计算式和顶点水平位移计算式,计算结果与试验结果符合较好。     

不同钢—混凝土组合剪力墙抗震性能对比分析

钢—混凝土组合剪力墙中钢板的布置形式是影响其抗震性能的一个主要因素。通过对两组内置钢板混凝土组合剪力墙和内藏钢桁架混凝土组合剪力墙试验的模拟,确定计算模型的建立方法,并选取两片相同含钢率的内置钢板混凝土组合剪力墙和内藏钢桁架混凝土组合剪力墙进行在侧向低周反复荷载作用下的计算分析,对比了两片剪力墙的承载力、刚度及其退化过程、延性、耗能特性及滞回特性。研究结果表明:在相同含钢率的条件下,内藏钢桁架混凝土组合剪力墙与内置钢板混凝土组合剪力墙相比,承载力、延性、耗能能力均有较明显提高。