Define seismic load and wind load in etabs tutorial using ubc 97 code duration. Special seismic load combinations has to consider as well for both allowable stress design and strength design in accordance to ubc97 section 1612. Load combination ubc 97 and aci beam structure reinforced. Dear all please explain how etabs v 9 create load combinations, the load combinations for seismic zone 2b and soil profile sd is not matching with the load combinations made by etabs v9 i am attaching the load combination of ubc 97 calculated manually. Earthquake resistant design according to 1997 ubc pdf4pro. Seismic load combinations structural engineering general. According to the documents the load combinations are based on ubc 97 asce7. Evaluation of ubc94 provisions for seismic design of rc structural walls. Here in this article we shall cover the method of calculating seismic forces defined in ubc 97. Then go to design concrete frame design view revise preferences and.
In fact, most of the building design result is governs with the seismic loads. Define seismic load and wind load in etabs using ubc 97 code. Define seismic load and wind load in etabs tutorial using. Therefore, peak modal responses must be combined based. These checklists are comprehensive and, as a result, somewhat lengthy. The output of the tests is load capacity, displacement and strain distribution occurred in the flange walls from both. Ubc97 code seismic force equation intergraph cadworx. The structure is analyzed for unamplified load cases separately e. Ubc97 load combinations in etabs v 9 software issues. Define seismic load and wind load in etabs tutorial using ubc 97. Because earthquake loads together with the wind loads considerations have a huge impact on the design result. Response spectrum modal combinations zpeak modal responses do not occur at the same time, that is, the peak rooftime, that is, the peak roof displacement for mode displacement for mode one occurs at t 1, whereas the peak displacement for mode two occurs at t 2, and so on.
A seismic analysis in the design of buildings especially high rise towers is a very important factor to consider. Widely accepted codes for calculation of seismic loads are, uniform building code 1997 ubc 97, international building code ibc, asce710, building code of pakistan seismic provisions, indian standard is1893. Based on section 1612 of ubc, structures are to resist the most critical effects from the following combinations of factored loads. Load combinations strength design and working stress design. Ubc 97 design procedure of chapter 19 which is aci 31899. Etabs 2015 tutorial 3 assigning seismic loads and load. Apply earthquake loads to building and apply wind load to building. The load combinations using strength design is changed with less seismic load multiply factor, for instance.