焊接栓钉型钢混凝土柱压扭抗震性能及其承载力
胡强 , 肖传远 , 陈宇良 , 吉云鹏 , 叶培欢
地震工程与工程振动 ›› 2026, Vol. 46 ›› Issue (4) : 201 -211.
焊接栓钉型钢混凝土柱压扭抗震性能及其承载力
Compression-torsion seismic performance and bearing capacity of welded stud steel reinforced concrete column
为研究压扭复合作用下焊接栓钉型钢混凝土(stud steel reinforced concrete,SSRC)柱的抗震性能,以轴压比和栓钉布置形式为变化参数对7个焊接栓钉型钢混凝土柱和1个型钢混凝土(steel reinforced concrete,SRC)柱试件进行拟静力低周往复加载试验。观察试件的破坏过程,获取其扭矩-扭转角滞回曲线、峰值荷载和破坏荷载等特征参数,分析了各变化参数对其抗震性能指标的影响。研究表明,压扭复合作用下,各试件均发生扭转破坏,试件最终破坏形态与栓钉布置形式无明显关联;试件的扭矩-扭转角滞回曲线呈倒S形;增大轴压比及在型钢上布置栓钉均可增大焊接栓钉型钢混凝土柱的抗扭承载力和扭转耗能,但增大轴压比会降低试件的变形能力;轴压比由0增大到0.4时,试件的峰值荷载提高了20.6%;各栓钉布置形式均可提高试件的峰值荷载,其中腹板布置栓钉提高效果最显著,提高了18.1%;栓钉在型钢上呈腹板、对称、X形布置时其抗震性能优于其余栓钉布置形式;最后,提出了焊接栓钉型钢混凝土柱的实用抗扭承载力计算公式,计算结果误差小于3%,具有比较好的适用性,为SSRC柱的抗震设计及应用提供参考依据。
To study the seismic behavior of welded stud steel reinforced concrete (SSRC) columns under the combined action of compression and torsion, quasi-static low-cycle reciprocating loading tests were conducted on seven welded stud steel reinforced concrete columns and one steel reinforced concrete (SRC) column specimen, with axial compression ratio and stud arrangement as variable parameters. The failure process of each specimen was observed, and the characteristic parameters such as the torque-torsion angle hysteresis curve, peak load, and failure load were obtained. The influence of each variable parameter on its seismic behavior index was analyzed. The results indicate that under the combined action of compression and torsion, torsion failure occurs in each specimen, and the final failure mode of the specimen has no significant relation to the arrangement of studs. The torque-torsion angle hysteresis curve of the specimen is in an inverted S-shaped. Increasing the axial compression ratio and arranging studs on the steel can increase the torsional bearing capacity and torsional energy dissipation of the welded stud steel reinforced concrete column, yet increasing the axial compression ratio will reduce the deformation capacity of the specimen. When the axial compression ratio increases from 0 to 0.4, the peak load of the specimen increases by 20.6%. Each stud arrangement can boost the peak load of the specimen, and the web stud arrangement has the most significant effect, which is increased by 18.1%. When the studs are arranged in web, symmetry, or X-shaped configuration on the section steel, their seismic behavior is superior to that of the other studs. Finally, a practical formula for calculating the torsional bearing capacity of welded stud steel reinforced concrete columns is proposed. The error of the calculation results is less than 3%, indicating good applicability. This study provides a reference for the seismic design and application of SSRC columns.
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国家自然科学基金项目(52368013)
国家自然科学基金项目(51908141)
中国博士后科学基金项目(2021M693854)
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