1. Jin, J and Meng, B (2011) "Computation of Wave Loads on the Superstructures of Coastal Highway Bridges", Ocean Engineering, 38(17-18), pp.2185-2200 Abstract: Recent hurricanes have caused severe structural damages to a number of coastal highway bridges along the US coast of the Gulf of Mexico. A large amount of bridge superstructure sections were displaced or pushed off the substructure by storm surge and wave action. To prevent such structural failure of coastal bridges, wave loads on bridge superstructures need to be quantified. In this study, two different numerical models were used to analyze wave-structure interaction and compute wave loads. Computational Fluid Dynamics (CFD) Software Flow-3D was used to analyze the effects of green water loading and superstructure elevation on wave forces. A 2D potential flow model was developed for computation of wave loads on bridge superstructures fully submerged in water. Wave induced pressure on bridge superstructures was obtained by solving complex velocity potential from Laplace's equation and boundary conditions using finite difference method. The 2D potential flow model was validated by large-scale laboratory measurements, and then used to perform parametric study using a range of wave parameters, water depth and bridge superstructure width. Equations for calculating wave loads on bridge superstructures were developed using results of the parametric study.
Key Words: Bridge design; Bridge loads; Wave loads; Wave action; Computational fluid dynamics; CFD
2. Jin, J and El-Tawil, S. (2005) "Seismic Performance of Steel Frames with Reduced Beam Section Connections" Journal of Constructional Steel Research, 61(4), pp.453-471 Abstract: Reduced beam section (RBS) moment resisting connections are among the most economical and practical rigid steel connections developed in the aftermath of the 1994 Northridge, California, earthquake. Although extensive experimental testing and some numerical simulations have shed light on the behavior of this type of connection, system level studies of RBS steel frames are still quite limited. As part of this research, nonlinear pushover and transient analyses of 4-, 8-, and 16-story frames with RBS connections are conducted with the objective of developing a better understanding of RBS frame behavior and exercising as well as critiquing the recently published FEMA-350 design specifications. The analyses confirm that in spite of inherently low overstrength, RBS frames are capable of economically providing good seismic performance in regions of high seismic risk. Other structural behavior issues with design implications are also discussed.
Key Words: Panel zone; Inelastic; Seismic; Steel; Moment; Frames; Northridge; Analysis; Reduced beam section; Overstrength; FEMA-350
3. Jin, J and El-Tawil, S. (2005) "Evaluation of FEMA-350 Seismic Provisions for Steel Panel Zones" Journal of Structural Engineering, 131(2), pp.250-258 Abstract: Steel panel zone design provisions have undergone large changes in the past four decades. The recently introduced FEMA-350 (2000) guidelines are substantially different from previous provisions, and are no longer a function of the plastic strengths of the panel zone and adjoining beams. Rather, they are based on the premise that the framing beams and the panel zone both yield simultaneously to promote controlled inelastic participation of both components. This paper evaluates and discusses the new provisions based on an examination of published test data and the results of transient analyses of buildings with four-, eight-, and sixteen-story moment resisting steel frames. The limited test results reviewed do not confirm the adequacy of the new panel zone provisions and furthermore suggest that panel zone deformation demands could be affected by connection detailing. The frame analysis results show that the FEMA-350 provisions lead to a rather low level of panel zone participation. A discussion of design implications and research needs is provided.
Key Words: Steel; Panels; Frames; Beam columns; Connections; Deformation; Design; Fractures
4. Jin, J and El-Tawil, S. (2003) "Inelastic Cyclic Model for Steel Braces" Journal of Engineering Mechanics, 129(5), pp.548-557 Abstract: A beam - column element that can accurately model the inelastic cyclic behavior of steel braces is presented. A bounding surface plasticity model in stress-resultant space coupled with a backward Euler algorithm is used to keep track of spread of plasticity through the cross section. Deterioration of cross-section stiffness due to local buckling is accounted for through a damage model. The proposed formulation has been implemented in a large deformation analysis program and is shown to be capable of predicting with reasonable accuracy the experimentally observed inelastic behavior of a variety of members subjected to reversed cyclic loading and a subassemblage under simulated seismic conditions.
Key Words: Buckling; Postbuckling; Bounding surface; Plasticity; Cyclic loads; Bracing; Steel
4. Jin, J., Yeung, N., Pan, A.D.E. and Chan, H.C. (1998) "An Experimental Study on Viscous-Damping Walls", Sixth East Asia-Pacific Conference on Structural Engineering & Construction, Taipei, Republic of China. (Download here).
Key Words: Structural materials; Mechanical properties; Construction materials; Buildings; Walls; Damping; Vibration effects; Stiffness; Dampers; Materials selection; Simulation; Seismic phenomena
5. Yeung, N., Jin J. and Pan, A.D.E. (1997) "Wind Tunnel Investigation of A Building Model with Viscous Damping Walls for Vibration Control", Proceedings of the 3rd Sino-Japan Technical Interchange Conference on Building Structures, Shenzhen, China.
2. Jin, J. (1996) "Numerical Simulation of the Relative Motion between Mooring Yoke and FPSO under Wind, Wave and Current" (In Chinese), Research Report, Tianjin Neptune Vibration Reduction Tech. Development Co. Ltd.