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📺Curved members and segmented members

The first set of excerpts focuses on modeling curved geometries such as arches and circles. A preliminary method involves selecting a straight member, splitting it into multiple components (e.g., 18 components), and then adjusting the coordinates of the nodes to position them along a curve or circle. For defining a circle, parameters like radius, center, and angular increment are used. For defining an arch, the "position on arch" function is used, specifying a start and end node and defining the camber (or rise).

Crucially, this segmented approach results in members that are "little straight facets" rather than physical curves. For proper structural representation, "proper curves" or "physical curved members" are required. These can be created directly using several methods:

By Height: Defining the start and end nodes and specifying a height, curving the member about its major or minor axis.
Center, Start, and End: Defining the center point of the curve, followed by the start and end points . The order of start and end points influences the resulting curve due to an anti-clockwise fashion convention .
Three Points: Defining the start, finish, and a third point inside the curve .

Physical curved members are considered more useful because they are correctly recognized for area loading and can be physically designed as curved members, whereas faceted members would be treated as complex polygonal surfaces for loading purposes .

Start Time	End Time	Summary of Content
00:00:07,520	00:00:17,560	Introduction to curved members, arches, and circles.
00:00:40,440	00:00:56,000	A member is selected and split into 18 components to prepare for curving.
00:01:07,040	00:01:23,960	Nodes are moved into a curve or circle using the position coordinates menu, which offers circles and arches, unlike the change coordinates menu.
00:01:38,880	00:02:07,120	Demonstrating creating a segmented circle in plan view by specifying the center and setting the radius (e.g., 5).
00:02:23,039	00:02:44,880	The circle is completed by setting the start angle to 0 and the increment to 20 degrees for 18 segments.
00:03:02,480	00:03:12,400	An undo operation is performed, and the focus shifts to the more powerful position on arch tool.
00:03:36,960	00:03:58,800	An arch is created using the camber setting (e.g., 3 meters rise), which lifts the member from the horizontal theoretical line .
00:04:11,840	00:04:22,240	The equal spacing option is used to space the nodes equally around the arch, rather than retaining the original local axis positions .
00:04:56,520	00:05:18,440	By setting the rotation to 90 degrees, the arch is transformed into a horizontal curve .
00:05:38,000	00:05:40,720	It is noted that the resulting shapes are little straight facets, not physical curved members .
00:06:05,800	00:06:19,040	The process shifts to creating a proper curved member directly, rather than just playing with coordinates .
00:06:19,680	00:06:59,750	A single curved member is created from existing facets; although it is a single curved member, it retains the nodal definitions in the background .
00:07:59,120	00:08:03,840	Three different methods for defining physical curve members directly (Add a curved member) are introduced .
00:08:05,200	00:08:24,800	Method 1: Curving by Height about its major axis .
00:08:44,720	00:09:00,400	Demonstrating Method 1 for a curved balcony using the minor axis .
00:09:12,240	00:09:41,040	Method 2: Defining the curve using Center, Start, and End points (curving with the minor axis) .
00:10:02,000	00:10:18,400	Adjusting the center point results in a more accentuated pushed out curve .
00:10:27,840	00:10:38,480	The order of selecting start and end points is important, as the curve generally follows an anti-clockwise fashion .
00:12:08,080	00:12:12,080	Method 3: Curving between three points .
00:12:44,240	00:13:03,200	The three-point method requires selecting the start, finish, and then the third point (inside the curve), demonstrated using the minor axis .
00:13:34,400	00:15:02,800	Applying the position on arch function to curve a whole facade horizontally (using 90 degrees rotation and 3-meter camber), noting that retaining local values brings the columns out with the curve .
00:15:20,880	00:15:56,080	Following the facade curve, the members are still straight facets and require converting using the create curve tool if physical curves are desired .
00:16:00,400	00:17:09,200	A key benefit of physical curved members is that they are correctly recognized for area loading and can be physically designed as curved members, which is more useful than faceted members .