外接撑杆钢板剪力墙滞回性能试验研究
Experimental Study on Hysteretic Behavior of Steel Plate Shear Wall with External Strut
钢板剪力墙的拉力场会对框架柱产生不利横向作用,易导致柱提前破坏;同时,墙板对框架梁的弯曲变形存在嵌固作用,会阻碍塑性铰发展,难以实现“强柱弱梁”的设计目标。针对这一问题,文中提出了一种外接撑杆钢板剪力墙结构,该结构由撑杆、内框架和墙板组成。其中内框架与墙板构成钢板剪力墙单元,经撑杆与主框架连接形成抗侧力结构。该结构利用钢板剪力墙单元屈曲后的拉力场提供主要抗侧刚度和承载力,并通过撑杆将拉力场作用力直接传递至主框架的梁柱节点,从而消除了对框架柱的不利影响,同时避免了墙板对框架梁的嵌固作用。基于该结构的受力机理推导了抗剪承载力和撑杆轴力的计算公式,并据此设计制作了2个外接撑杆钢板剪力墙试件和1个无墙板的对比试件。通过拟静力试验获得滞回曲线、骨架曲线、特征荷载及位移等指标,分析延性、耗能、承载力与刚度退化等性能,并明确了各试件的屈服顺序和破坏机制。研究结果表明:该新型结构具有良好的滞回性能,加载全过程中未出现整体失稳现象;墙板在往复荷载作用下的裂缝贯通对撑杆破坏起控制作用;撑杆轴力和抗剪承载力计算公式与试验结果吻合良好。
The tension field of steel plate shear wall has an adverse transverse effect on the frame column, which is easy to lead to the advance failure of the column, and the steel plate has an embedded effect on the bending deformation of the frame beam, which makes it difficult to develop the plastic hinge and implement the "strong column and weak beam". To solve this problem, a steel plate shear wall structure with external strut is proposed in this study, which is composed of strut, inner frame and steel plate. The inner frame and the steel plate constitute the steel plate shear wall unit, which is connected with the main frame through the strut to form the lateral force-resisting structure. The tension field of the steel plate shear wall unit is used to provide the main lateral stiffness and bearing capacity, and the force of the tension field is directly transferred to the beam-column joints of the main frame through the strut, thus eliminating its adverse influence on the frame column and avoiding the embedded effect of the wall plate on the frame beam. Based on the mechanism of the structure, the formulas for calculating the shear capacity and the axial force of the strut were derived, and two steel plate shear walls with external strut and one comparison specimen without wall plate were designed. The hysteretic curve, skeleton curve, characteristic load and displacement were obtained by quasi-static test. The ductility, energy dissipation, bearing capacity and stiffness degradation were analyzed, and the yield sequence and failure mechanism of each component were determined. The results show that the new structure has better hysteretic performance, and the global instability will not occur during the whole loading process. The crack penetration of the steel plate under the cyclic load controls the damage of the strut. The formulas for calculating the axial force of the strut and shear capacity are in good agreement with the test results.
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国家自然科学基金(52378189)
国家自然科学基金(51808436)
陕西省重点研发计划(2023QCY-LL-27)
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