Experimental and numerical investigation on punching shear behavior of an enhanced embedded column base for CFSTs
Experimental and numerical investigation on punching shear behavior of an enhanced embedded column base for CFSTs
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DOI：
10.1007/s43452-023-00693-9
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发表时间：
2023-05
影响因子：
4.4
通讯作者：
Shasha Tan;Lanhui Guo;Chen Jia
中科院分区：
文献类型：
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作者：
Shasha Tan;Lanhui Guo;Chen Jia
为提高钢管混凝土柱的抗冲切性能，提出了一种加强型预埋式钢管混凝土柱脚，即在钢管预埋区通过横隔板设置一对加强梁。首先对8个柱脚试件进行了冲切试验，研究了这种柱脚的工作机理。试验参数包括加固梁的长度和埋深。试验结果表明，冲切截面从横隔板开始，扩大了冲切锥，提高了冲切抗力。还进行了数值模拟。首先，建立有限元模型，并根据测试结果进行验证。然后开发了全尺寸模型，以进行参数研究并丰富数据库。最后，提出并验证了预埋式柱脚抗冲切承载力的计算方法。该计算方法考虑了粘结力、临界截面混凝土和箍筋的抗力、横隔板和加固梁的贡献。
To improve the punching shear resistance, an enhanced embedded column base for concrete-filled steel tubes has been proposed, where a pair of strengthening beams are installed on the embedded region of the steel tube by the diaphragm plates. Punching tests were first conducted on eight specimens to investigate the working mechanism of this kind of column base. The test parameters included the length and embedded depth of the strengthening beam. The test results indicated that the punching shear section initiated from the diaphragm plate, which enlarged the punching cone and improved the punching shear resistance. The numerical modelling was also performed. First, finite element models were established and validated against the test results. Full-scale models were then developed to conduct the parametric studies and enrich the database. Finally, a calculation method to evaluate the punching shear resistance of the enhanced embedded column base was proposed and validated. This calculation method takes into account the bonding force, the resistance of the concrete and stirrups on the critical section, and the contribution of the diaphragm plates and strengthening beams.