短肢多腔钢混凝土组合剪力墙性能与设计

Reinforced Concrete Short-legged Shear Walls (RCSSW) have been used widely in high-rise buildings in China, with their distinctive advantages such as various cross-sectional shapes, flexible positioning, and beautiful combination of both load bearing and space planning requirements. In order to improve RCSSW bearing capacity and earthquake resistance performance, this application proposes a new type of shear wall, which is composed of multi-partition hollow steel sections filled with concrete and named “Short-legged Multi-partition Steel-concrete Composite Shear Wall (SMSCSW)”. Maintaining the features of RCSSW, the new SMSCSW can achieve a higher bearing capacity, better energy absorption and deformation ability through the composite action between multi-partition steel tubes and in-filled concrete. Moreover the multi-partition steel tubes can also be used as load bearing members and concrete forms in the process of construction, which provides great convenience to the site work. This research focuses on L-shape and T-shape short-legged multi-partition composite shear walls. Their mechanical behavior under axial compression, combined compression and bending, hysteretic loadings will be extensively investigated. The related affecting factors including torsion will also be considered. This research will reveal the fundamental working mechanism of SMSCSW, and will obtain the calculation methods and then design methods for SMSCSW under compression, combined compression and bending, shear and hysteretic loadings. Furthermore, the maximum width-to-thickness ratio of multi-partition tubes, and appropriate axial load ratio under different aseismic levels will also be proposed.

钢筋混凝土短肢剪力墙以截面形式多样、设置部位灵活、承载方式与空间使用能巧妙结合等优势，在高层建筑中被大量采用。本项目针对传统钢筋混凝土短肢剪力墙承载力和抗震性能方面的弱点，提出了一种由多腔钢管和混凝土组成的新型 “短肢多腔钢混凝土组合剪力墙”，这种新型短肢组合剪力墙继承了钢筋混凝土短肢剪力墙的优点，通过多腔钢管与混凝土的组合作用克服了钢筋混凝土短肢剪力墙的缺点，在外荷载作用下表现出良好的承载、耗能和变形性能；多腔钢管还可作为施工时的承载骨架和混凝土模板，使施工便捷。本项目主要研究工程上常用的L形、T形短肢多腔组合剪力墙，研究其在轴压和压弯荷载作用下的性能，并考虑扭转等诸多因素的影响；研究短肢多腔组合剪力墙的滞回性能；本项目研究将深入揭示短肢多腔组合剪力墙的工作机理，得到其轴压、压弯和抗剪承载力以及抗震性能指标的计算方法和设计方法，给出考虑不同抗震等级的钢板宽厚比限值、构件的合理轴压比。

钢筋混凝土短肢剪力墙以截面形式多样、设置部位灵活、承载方式与空间使用能巧妙结合等优势，在高层建筑中被大量采用。本项目针对传统钢筋混凝土短肢剪力墙承载力和抗震性能方面的弱点，提出了一种由多腔钢管和混凝土组成的新型“短肢多腔钢混凝土组合剪力墙”，这种新型短肢组合剪力墙继承了钢筋混凝土短肢剪力墙的优点，通过多腔钢管与混凝土的组合作用克服了钢筋混凝土短肢剪力墙的缺点，在外荷载作用下表现出良好的承载、耗能和变形性能；多腔钢管还可作为施工时的承载骨架和浇筑混凝土的模板，使施工便捷。. 本项目采用试验研究与有限元分析相结合的方法研究了一字型、十字形、T形和L形短肢多腔组合剪力墙轴压短构件的截面承载力，研究表明此类组合剪力墙具有较高的承载力和良好的延性，多腔组合剪力墙的内隔板对核心混凝土有较好的约束作用，其承载力比相同截面矩形钢管混凝土略高；在此基础上进行了轴压长构件和压弯构件的试验研究和有限元分析，对于异形多腔短肢组合剪力墙，由于截面相对开展，在常用试件高度范围内，构件具有较高的稳定承载力，截面扭转对构件稳定承载力的影响较小，通过大量参数分析提出压弯构件的承载力计算方法；最后对构件的压弯滞回进行了理论分析与试验研究，研究结果表明：实际结构中内隔板不承担竖向荷载，仅起到加劲和约束作用，构件的轴压比越高，对应的滞回曲线越饱满；短肢组合剪力墙的钢板宽厚比限值可按照有关矩形钢管混凝土的设计规定选用；在异形组合剪力墙端部设置截面宽厚比较小的钢管可显著提高构件的承载力和延性；短肢组合剪力墙的轴压比和层间位移角限值可借鉴《钢板剪力墙技术规程》中组合剪力墙的相关规定。