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<br /> <br />Chapter VI: General Design Practices <br />Elevation <br /> <br />Seismic Analysis: There are no "typical" formulas for <br />houses since the calculation of seismic loads depends upon <br />the building code in use and the size and shape of the house. <br />The governing building code will clearly spell out the <br />correct procedure to follow. Some houses will be more <br />complex due to their shape. However, the general proce- <br />dure, as illustrated in Chapter IV, is presented below, <br /> <br />. Calculate dead loads by floor, These include permanent <br />dead loads (roof, floor, walls, and building materials) <br />and permanent fixtures (cabinets, mechanical/electrical <br />fixtures, stairs, new locations for utilities, etc,), <br /> <br />. Determine if the snow load must be included in the dead <br />load analysis. Most building codes require the snow load <br />to be included for heavy snow regions, The building <br />code will list these requirements, <br /> <br />. Determine the seismic zone and importance factors, <br /> <br />. Determine the fundamental period of vibration (height <br />of structure materials used in building), <br /> <br />. Determine total seismic lateral force by analyzing site <br />considerations, building weights, and the type of resist- <br />ing system. <br /> <br />. Distribute the loads vertically per the building code, <br />keeping in mind additional force at the top of the build- <br />ing. <br /> <br />. Distribute the loads horizontally according to the build- <br />ing code and the stiffness of resisting elements, The <br />code-prescribed minimum torsion of the building (center , <br />of mass vs, center of rigidity), shear walls, bracing, and <br />frames must be considered. <br /> <br />VI - E.36 <br /> <br />Engineering Principles and Practices of Retrofitting Flood-Prone Residential Structures <br />January 1995 <br />