Browsing by Subject "Structural frames"
Now showing 1 - 6 of 6
Results Per Page
Sort Options
Item Analysis of plates and slabs on elastic foundations(Texas Tech University, 1972-08) McGuire, Ralph LymanNot availableItem Bracing design requirements for inelastic members(2002-05) Li, Guzhao; Yura, J. A.Using properly spaced and designed bracing can substantially increase the buckling capacity of a member. A brace needs to satisfy both stiffness and strength requirement. Significant research has been done for the bracing requirements of elastic members. Relatively little work has been performed for the bracing design of inelastic members. This research focuses on the brace design requirements for structures that rely on plastic redistribution or energy absorption. The finite element analysis results for lateral bracing behavior in inelastic beams are presented. The research focuses on the lateral bracing requirements to achieve a specified rotation capacity in braced members subjected to uniform moment and moment gradient. The brace stiffness and lateral brace force requirements for inelastic steel members are evaluated considering the effects of unbraced length, flange slenderness and web slenderness. The results show that the current AISC-LRFD requirements for brace stiffness are adequate and not sensitive to rotation capacity. Brace forces, however, increase as rotation capacity increases. Brace forces also increase significantly when local flange and web buckling occur. The factors affecting beam rotation capacities and lateral brace forces are discussed. A design formula for beam rotation capacities is proposed. The lateral bracing behavior of inelastic beams under cyclic loading were investigated both experimentally and analytically. The bracing requirements for inelastic columns were also considered.Item Natural frequencies of two elementary rigid frames(Texas Tech University, 1964-05) Shadden, James ArthurThe natural frequencies of two elementary rigid frames, the rectangular bent and the two member frame, were determined for various ratios of length, moment of inertia, and mass per unit length of the vertical and horizontal members. The natural frequencies were found by solving the frequency equation which was obtained from the partial differential equation of motion of a distributed mass and elasticity beam. Both motion in the plane of the frame and motion perpendicular to the plane were considered. To verify the analysis, the natural frequencies were determined by an experimental method, and the two results compared.Item Seismic performanc of link-to-column connections in steel eccentrically braced frames(2004) Okazaki, Taichiro; Engelhardt, Michael D.Item Seismic strengthening by providing structural diaphragm(2006) Wang, Renjun; Jirsa, J. O. (James Otis); Wood, Sharon L.There are a large number of precast frame buildings used in Turkey for industrial facilities. One-story warehouses are the most common structural configurations. Because there was little redundancy in the lateral load resisting system, many precast buildings were damaged beyond repair during the 1999 earthquakes in Turkey. In the present study, a rehabilitation scheme is proposed to add a structural diaphragm at the roof level by adding diagonal bracing. With the diaphragm action developed, the lateral forces can be transmitted among the cantilever columns, and to the vertical diagonal braces on the periphery, thus the seismic performance can be enhanced. An analysis method is also developed for the rehabilitation design.Item Wind effects on a full-scale frame(Texas Tech University, 2002-12) Jain, ShikhaThe design of structural members entails computation of members' stresses generated due to various loads such as dead load, live load, wind load, earthquake load etc. This study restricts itself to the determination of load effects arising out of wind load. The subject of this research is the building located in the WERFL field site, Texas Tech University, Lubbock. The building is comprised of three portal frames. The focus is on determining load effects at three locations for the middle frame of the building Influence coefficients are obtained for various tap locations on the building. The pressure coefficients obtained from model scale testing of WERFL at UWO boundary layer wind tunnel are combined with the influence coefficients to obtain the desired load effects. This has been enabled through MATLAB programs developed for this research. The marginal relative frequency distribution for these load effects is compared to Gaussian and Gamma distributions to understand the applicability of these distributions in generalizing the wind tunnel results. Load effects are computed for this building using ASCE 7 recommended pressure coefficients. These values have been compared with wind tunnel load effects. The magnitude of load effect obtained using ASCE 7-98 pressure coefficient values is higher than the mean value obtained using wind tunnel data for all load effects except for uplift in leeward column and is observed to lie in the tail region of the marginal distribution of load effect generated using wind tunnel data.