NEHRP Clearinghouse

Guidelines for Mitigation of Seismic Hazards in Tilt-Up-Wall Structures. Phase I.
Adham, S. A.
National Science Foundation, Washington, DC. Office of Planning and Resources Management., February 1981, 97 p.
Efforts to mitigate seismic hazards in tilt-up-wall (TUW) construction are evaluated. Analytical methods that can be used to determine the seismic response of TUW structures are described. Seismic response of a typical warehouse building with plywood roof diaphragms supported on TUW panels was studied using a lumped parameter model. Experimental data on loading and unloading of plywood diaphragms were idealized. A nonlinear stress/strain relationship was included in the model together with viscous damping. A strong motion earthquake record was used as input to the analyses which indicate that the interaction of plywood diaphragms and panels during earthquakes results in amplified forces at the panel connections to the diaphragms, and in amplified moments at the mid-height of the panel. These efforts determine what studies are necessary to achieve guidelines that can be used to provide seismic resistance of these types of components while keeping their cost to a minimum. Specific experimental and analytical studies are recommended for Phase II.
Seismic design; Earthquake resistant structures; Precast concrete; Tilt up walls; Mathematical models; Walls; Dynamic response; Buildings; Earthquake engineering; Panels; Stress analysis