Zhidong Zhang

Johns Hopkins University | JHU · Department of Civil and Systems Engineering

The objective of this paper is to detail the ongoing development and validation of a high fidelity shell finite element model of steel sheet sheathed cold-formed steel (CFS)-framed shear walls. This effort is part of an ongoing research project: CFS-NHERI, which aims to advance the state of the art for seismic performance and design of mid-rise col...

The objective of this paper is to provide an introduction to a recently compiled database of cold-formed steel framed shear wall tests and demonstrate the application of this database for improving the understanding and modeling of cold-formed steel framed shear walls. Over the last 20 years a substantial number of cold-formed steel framed shear wa...

In the current research, distortional buckling of cold-formed stainless steel open-section beams was investigated. Four-point bending tests of eight C-section stainless steel beams, made of S30401 alloy, were carried out with global and local buckling precluded by careful design of specimen and test rigs. A detailed finite element model based on AB...

The main objective of this research is to experimentally characterize the performance of isolated single sheathing-to-framing fastener connections under cyclic load as utilized in emerging classes of cold-formed steel (CFS) framed steel sheet sheathed shear walls used for seismic lateral resistance. New shear wall variations include the use of stee...

The primary objective of this work is to provide connection-level force-deformation response appropriate for standard cold-formed steel (CFS) framed steel sheet sheathed shear walls under cyclic loads. Common CFS framing designs increasingly are exploring thicker framing options so that walls can meet gravity demands, overturning demands, and seism...

Many monotonic and cyclic tests have been conducted on cold-formed steel framed shear walls in the last 20 years. Cold-formed steel framed shear wall provisions in AISI S240, AISI S400, and ASCE 41 are supported by the data obtained through these tests. The main objective of this article is to introduce a recently compiled cold-formed steel framed...

A parametric investigation and design proposal for the back-to-back built-up cold-formed steel (CFS) channel sections with V-stiffeners and Σ-stiffeners under concentric and eccentric loading are presented in this paper. A nonlinear finite element model considering the initial geometric imperfection was developed and validated against experimental...

Cold-formed steel (CFS) structures are widely used in construction and infrastructure due to their lightweight and high-strength properties. However, their thin-walled nature makes them geometrically sensitive to compressive loading. The Digital Twin (DT)-based numerical simulation method is developed using the actual geometries of CFS shapes, whic...

The objective of this paper is to evaluate the impact of applying the ASCE 41-17 performance-based design provisions on a 2-story building previously designed and tested during the CFS-NEES research project. The latest version of the American Society of Civil Engineers Standard 41 (ASCE 41-17) incorporates new provisions for the assessment of cold-...

The testing investigates the fastener-level force-deformation response appropriate for cold-formed steel (CFS) framed steel sheet sheathed shear walls under cyclic loads. A total of 156 tests were completed in a lap shear testing configuration. The work is intended to provide critical missing information of the fastener behaviors in CFS-framed stee...

The objective of this paper is to reassess the resistance factor for cold-formed steel-framed shear walls for both Canadian Limit States Design and American Load and Resistance Factor Design in light of a recently compiled database of cold-formed steel shear wall tests and consistent with current seismic practice established in the North American S...

To explore the potential of using stainless steel structurally, extensive research has been carried out to study the structural behavior of stainless steel member as associated with the nonlinear stress-strain relationship. Hollow flange sections feature improved structural efficiency and a unique issue of web distortion. Steel hollow flange sectio...

In order to reduce wind loads and improve the wind-resistant performance of high-rise buildings, three rigid high-rise building models, including a baseline model with the square cross-section, a corner recessed model, and a corner recessed and air-suction controlled model, were made based on the principle of the same-height and same-volume, and th...