Abstract
This paper proposes a hybrid coupled partially encased composite (PEC) wall system, obtained through the connection of two PEC walls by means of the shear critical steel coupling beams with an innovative welded connection. This structural solution is designed to take advantage of both the stiffness of the PEC walls (required to limit building damage under frequent earthquakes) and the ductility of the steel coupling beams (necessary to dissipate energy under medium-intensity and high-intensity earthquakes). The connection performance of an innovative rigid joint with different configurations in this system is studied through pseudostatic analysis, and the seismic performance of the proposed hybrid coupled PEC wall system is evaluated through multirecord nonlinear dynamic analysis of a set of case studies. Adopted finite element models are developed and validated against the available experimental results. A summary of the results is presented and discussed to highlight the potential of the proposed hybrid coupled PEC wall systems. The key feature of this system is development of a reasonable two-level yielding mechanism (the first level is the yielding of the coupling beams, and the second level is the yielding of the PEC wall) without damage to the welded joints.
Highlights
A partially encased composite (PEC) structure has been known for its attractive combination of high elastic stiffness and superior inelastic performance characteristics
(a) 6000 4000 2000 0 –2000 0 –4000 –6000 –8000 (b) design loads, i.e., self-weight and permanent and live loads. e lowest six vibration modes are shown in Figure 15, and the natural period of vibration calculated by ABAQUS and YJK is reported in Table 3. e response results show a satisfactory agreement between the period of vibration calculated by ABAQUS and that calculated by YJK
In a hybrid coupled PEC wall system, coupling beams dissipate the energy induced by earthquake loads through inelastic deformation. e structure could resist the loads by severe earthquakes, and there was no danger of structure collapse
Summary
A partially encased composite (PEC) structure has been known for its attractive combination of high elastic stiffness and superior inelastic performance characteristics It has great potential as a seismic-resistant solution if properly designed to exploit the stiffness contribution of the concrete material and the dissipative capacity of the steel components. Yunan et al developed a design procedure for the considered PEC wall system according to the results of the tests [12] In this way, PEC structures could be utilized in midrise buildings in seismic regions. E proposed hybrid coupled PEC wall system is composed of two single PEC walls connected by means of steel coupling beams. This paper discusses the connection performance of the innovative rigid joints with different configurations in this system through pseudostatic analysis and investigates the seismic performance of the hybrid coupled PEC wall through multirecord nonlinear dynamic analysis. A set of case studies was used to gain insight into the seismic performance of structures both at the element level, e.g., local stress and strain in the rigid joints, and at the structural level, e.g., lateral displacements, yielding and damage sequence, and performance at assigned seismic intensities
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