摘要
为了满足建筑功能的需求,正交方向布置的一字形墙通常被连接成一体,形成不同截面形式的带翼缘剪力墙.T形截面剪力墙作为其中最典型的墙肢组合形式,其截面的不对称性会导致不同受力方向下的变形性能和塑性铰长度存在明显差异.为了揭示T形截面钢筋混凝土(RC)剪力墙塑性铰的形成和发展机制,建立了T形墙精细化有限元分析模型.在验证模型有效性的基础上,通过分析T形墙沿高度方向的应变和曲率分布,定义了T形墙塑性铰长度的取值方法,进而分析了塑性铰长度在全过程受力中的变化规律,并结合T形墙的损伤机理和截面应变分布详细阐释了不同设计参数对塑性铰长度的影响.研究结果表明:T形墙在翼缘受拉方向的塑性铰长度主要由受压混凝土的压碎范围决定,且取值相对较小,在整个加载历程中呈现先快后慢再快的增长趋势;而翼缘受压方向的塑性铰长度完全由受拉钢筋的屈服范围决定,其增长速率呈现不断减小的趋势.基于参数分析结果,提出了一种考虑弯矩梯度、剪切效应和纵筋滑移贡献的T形墙塑性铰长度简化计算公式.通过与试验结果的比对,验证了简化公式的准确性.所提公式符合T形墙的变形特征,且可应用于L形墙.研究成果可为带翼缘面RC剪力墙基于变形的抗震设计和性能评估提供依据.
To meet architectural requirements,rectangular walls arranged in orthogonal directions are commonly connected to form flanged shear walls with different section types.The T-shaped shear wall,as the most typical combination form of wall segments,demonstrates different deformation performances and plastic hinge lengths under various loading directions due to the asymmetry of its cross section.To reveal the formation and the development mechanism of the plastic hinge of reinforced concrete(RC)shear walls with flange,a refined finite element analysis model for the T-shaped RC shear wall was established.Based on the verified model,the method to determine the plastic hinge length of the T-shaped RC wall was defined by analyzing the distributions of strain and curvature along the wall height.The variation of the plastic hinge length over the whole loading process was then analyzed.Combined with the damage mechanism and sectional strain distribution of the T-shaped wall,the influence of different design parameters on the plastic hinge length was elaborated.Results show that the plastic hinge length of the T-shaped wall under the flange-in-tension loading is mainly determined by the crushing range of compressive concrete.In addition,the derived value is relatively small,showing an initial growth trend of fast,then slow,and finally fast.For the flange-in-compression case,the plastic hinge length is completely determined by the yielding range of the tensile reinforcement,and the growth rate shows a decreasing trend.Based on parametric analysis results,simplified formulas for calculating the plastic hinge length of the T-shaped wall were proposed,which takes into account the contribution of the moment gradient,shear effect,and longitudinal bar slippage.The accuracy of the simplified formulas was verified by a comparison with experimental results.The proposed formulas conform to the deformation characteristics of the T-shaped walls and can also be applied to L-shaped walls.Research results can provide references for the defor
作者
王斌
史庆轩
吴梦臻
Wang Bin;Shi Qingxuan;Wu Mengzhen(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Laboratory of Structural Engineering and Seismic Resistance,Ministry of Education(XAUAT),Xi’an 710055,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2022年第8期848-861,共14页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51808435,51878540)
陕西省高校科协青年人才托举计划资助项目(20190419).
关键词
钢筋混凝土
T形墙
有限元分析
塑性铰长度
简化计算
reinforced concrete
T-shaped wall
finite element analysis
plastic hinge length
simplified calculation
