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Ultimate limit state (ULS) load combinations shall be as follows. There are two methods we used for dynamic analysis. Not only the material nonlinearity but also the load nonlinearity is also considered in the analysis. The dynamic action of the loads is considered in the analysis. Though the loads are considered as static, material nonlinear can be considered in the analysis. Accordingly, the base shear is distributed over the building.
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Mass of each floor is considered as a lump at floor level. We considered the slump mass method to analyze the structure in this method. Then the base shear is distributed over the structure according to its mass and height.įor example, consider a building having four floors. In this method, we calculate the base shear as per the relevant parameters. The main factor is the consideration of earthquake forces as static. We applied the seismic loads to the structure as static loads and carrying the static load analysis. Mainly there are two types of seismic analysis. Let’s move on to the main subject UBC 1997 Seismic Desing process. Mainly the following two concepts are adopted to the structural system. The location of the earthquake is found using the primary and secondary waves. There are three basic types of seismic waves. This results in a sudden release of energy and as a result, seismic waves are created. It is shaking and vibration at the surface of the earth due to the underground movement of a fault plane or due to volcanic activity. UBC 1997 seismic desing procedure is not a complicated process and it can be adapted to the design very easily though it is believed that those calculations are complicated.īefore studying the UBC 1997 seismic design process and UBC 1997 seismic design example, let’s discuss a few basics of seismic design.