Abstract
This research proposes a beam-column hinged joint with additional replaceable energy-dissipating elements, which is highly industrialized and fully fabricated. In this structure, steel beam and steel column are hinged with pins, at which corners a replaceable energy dissipation element is added. The energy dissipation element is rigidly connected to the steel column through a section of H-beam and high-strength bolts and is hinged to the steel beam using high-strength bolts. The main materials, such as energy dissipation elements, steel columns, and steel beams, are all steel with a design yield strength of 345 MPa. Under the condition that the vertical clear distance between the energy dissipation element and the steel beam is constant at 0.2 m, and the size and section of the beams and columns remain unchanged, six groups of different test samples are constructed by changing the thickness and the horizontal length of the energy-dissipating element. Through the experimental research and numerical simulation of 6 groups of specimens, the strength, stiffness, ductility, hysteresis curve, energy dissipation coefficient, equivalent viscous damping coefficient, and failure mechanism of the joints are obtained, and the horizontal section of the energy dissipation element is mainly analyzed. The effects of parameters such as the ratio of length to span and its ratio to the linear stiffness of steel beams on the seismic performance of the joints were compared with those of traditional welded steel frame beam-column joints. The research results show that the joints can be fully assembled, the energy-consuming components can be replaced, and the beam-column connection joints can be controlled in practical applications. The deviation between the experimental results and the numerical simulation results is less than 10%, which is in good agreement. The failure mode of the node conforms to the seismic performance concept of “energy-dissipating elements are destroyed first and easily replaced after earthquakes”; when the ratio of the horizontal length to the span of the energy-consuming components is 0.225, and the ratio to the linear stiffness of the steel beam is 0.7, the seismic performance is close to or superior to that of traditional welded steel frame beam-column joints, that is, equal to or better than traditional welded steel frame beam-column joints.
Highlights
IntroductionHyogoken–Nanbu Earthquake in Japan, through on-site inspection of buildings with steel frame structure system, the beam-column joints connected by welding showed various forms of damage or brittle fracture and some even collapsed due to their existence
The research was focused on the main seismic performance evaluation factors such as failure mode, strength, stiffness, ductility, hysteresis curves, and energy dissipation capacity
The research was focused on the main seismic performance evaluatio through the experimental study and finite element numerical simulation of 6 groups of as failure mode, strength, stiffness, ductility, curves, steel frames with replaceable energy dissipation elements,hysteresis and compared with theand finiteenergy element of the traditional welded steel finite frame
Summary
Hyogoken–Nanbu Earthquake in Japan, through on-site inspection of buildings with steel frame structure system, the beam-column joints connected by welding showed various forms of damage or brittle fracture and some even collapsed due to their existence It causes a lot of waste of resources and economic losses [4–6], and the restoration of buildings and urban functions are seriously affected. Based on the reduction or avoidance of on-site welding work, the use of fully assembled steel beam-column joints is a good choice, that is, through reasonable building structure design, the components are connected by high-strength bolts or rivets, etc. Investigate the seismic performance differences between the joints with replaceable energy-dissipating elements, fully fabricated and traditional all-welded steel frame beam-column joints, and find out reasonable design principles or methods. In the investigation, when this new type of fabricated beam-column connection with replaceable energy dissipation elements is applied to actual projects, the PPSD method [25] will be used to evaluate the long-term behavior of the structure, using the TF method [26] to examine the effects of seismic or civil engineering equipment on the structure
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