Abstract
Compared with the traditional steel rigid connection, the beam-column connections with weakened beam end have better ductility, but the local buckling in the weakened zone and the overall lateral deformation may occur in strong earthquake. The replaceable steel connection with low yield point metal is proposed based on the concept of earthquake resilient structure. In this connection, the weakened parts in the flange slab and web plate are filled with low yield point metal, and the metal firstly yields and dissipates energy sufficiently in earthquake; hence, the main parts are intact and the yield point metal can be replaced. The seismic performances of the three types of connections which include traditional connection, beam end weakened connection, and replaceable connection with low yield point steel under low cycle reciprocating load are studied. In addition, the energy dissipation capacity and damage characteristics of different connections are compared. The multiscale finite element models for the steel frames with different connections are analyzed by time-history method; both the computational efficiency and the accuracy are assured. The analysis results approve that the replaceable connection can confine the major damage in the replacement material and have better energy dissipation ability, safety reserves, and resilient ability.
Highlights
Steel frames are commonly used in multistory and high-rise buildings
The deformation of the replaceable connection 2 is similar to the traditional connection but the plastic hinge moves to the replaceable metal zone, and the local buckling and energy dissipation occur mainly in the low yield point metals while the damage in the main material is minor
The results show that all the hysteresis curves have plump shapes and satisfactory ductility, and the size of the replaceable parts has less impact on the energy dissipation capacity of the connections
Summary
Steel frames are commonly used in multistory and high-rise buildings. In seismic design and maintenance of steel frames, the construction form and energy dissipation capacity of the beam-column connections are important and directly affect the safety and reliability of the total steel structures. In view of the backgrounds above, a new type of replaceable steel beam-column connection with low yield point metal is proposed in order to overcome current deficiencies of the beam end weakened steel connection In this new connection, the weakened parts in the flange slab and web plate are filled with low yield point metal, and the low yield point metal firstly yields and dissipates energy sufficiently in earthquake; the integral seismic performance is improved. The seismic performances of the three types of connections which include traditional connection, beam end weakened connection, and replaceable connection are studied with low cycle quasistatic simulation, and the energy dissipation capacity and damage characteristics of different connections are compared. The superiority of replaceable connection for seismic damping is verified
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