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| Test and numerical study on seismic performance of demountable and replaceable steel beams connected with T-shape steel |
| MEN Jinjie1, ZHANG Qian1, LI Jiafu2, WANG Jiachen1, ZHANG Huihuang1, XU Chao2 |
| 1. School of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, China;
2. MCC Capital Engineering & Research Incorporation Limited, Beijing 100176, China |
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Abstract This paper proposed a replaceable steel beam connected by T-shape steel plate. The T-shape connections dissipate the seismic energy under earthquakes, and be replaced after earthquakes to achieve the restoration of structural function. A yielding mechanism in which the T-shaped connections concentrate on damage dissipation and the central and cantilever sections of the steel beam remain elastic is achieved by rationally designing the bending capacity relationship between the T-shaped connections, the central section and the cantilever section of the steel beam and by defining the range of values for the design capacity weakening coefficient. To achieve the optimal damage and energy dissipation, four T-shape connections with different cross-sections and different materials for webs were designed. Pseudo static test and finite element analysis were carried out on replaceable steel beam specimens. Results show that the replaceable steel beams with T-shape connections can achieve the expected yielding mechanism and achieve the purpose of concentrated energy dissipation in T-shape connections. The residual deformation of the webs and bolt deformation values could allow the dismantling and replacement to be carried out. The structural function remains consistent after replacement, which indicates that the desirable replaceable mechanism is achieved. T-shape connectors with dog-bone web sections have more uniform plastic deformation, larger energy-consuming areas and an increase in energy-consuming efficiency of approximately 30%, with little difference in dismantling and replacement time and residual deformation compared to normal sections, so it is recommended that dog-bone sections be used for webs. Low yield point steel can improve the energy dissipation efficiency by about 40%, and can be selected for T-connections webs with reasonable values of the design load factor. Finally, based on the test and finite element results, and considering the dismantling and replacement of the T-shape connections and material utilization, it is recommended that the weakening coefficient of design load-bearing capacity be taken as 0.65~0.85.
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Received: 11 May 2023
Published: 15 April 2024
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