Eurocode Wind UK NA 1991-1-4:2005
Setting | Description | ||||||||
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Direction | Select the directions in which the wind forces are to be generated. | ||||||||
Building Height, h | Specify the building height directly or by selecting one of the calculated directions. | ||||||||
Building Width, b | Specify the building width as the maximum exposure dimensions or by specifying the width for wind in each direction. | ||||||||
Natural Frequency | For each direction, specify a natural frequency or use the program-calculated value. | ||||||||
Wind Force |
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Terrain and Location | Select either Town, Country, or Sea for the Terrain Category. Type the Distance to Sea, Distance to Town, and Displacement height in both X and Y directions. | ||||||||
Basic Wind Velocity, Vb | Type the factors used to calculate the basic wind velocity, vb. | ||||||||
Orography Factor, co(z) | Type a value to use for Orography Factor, co(z) or select the Use Calculated option and then specify the values as needed per Annex A.3. | ||||||||
Generate Additional Load Cases for Analysis with Tension-Only Members |
RAM Frame utilizes a nonlinear analysis algorithm to keep track of tension-only members during solution of the structural model under applied loads. Since the process has a nonlinear (iterative) nature, analysis results can not be simply superposed with other results as in load combination option in RAM Frame. Therefore, each lateral load case (wind or seismic) are solved separately. Since the direction of the lateral loads become important in an iterative analysis, RAM Frame provides an option such that additional load cases can be created upon user request. When Generate Additional Load Cases for Analysis with Tension-Only Members in generating lateral load cases (wind and seismic load cases only) is invoked, additional load cases are created. For instance, there are 12 load cases generated for a regular IBC 2000 (ASCE 7-98) Wind load case. If this box is checked, the number of the load cases becomes 22. Additional load cases are created to account for directional effects of applied loads so that the most severe loading case is captured. |