Components & Cladding¶

The Components & Cladding section calculates the design pressures on individual building elements per ASCE 7 Chapter 30: wall panels, windows and doors, roof decking and its fasteners, and parapets. Pressures are tabulated by zone against the effective wind area of the element, so the same region serves a small window and a large curtain wall panel.

Chapter 30 is numbered differently in each edition. Section, figure, and equation numbers in the text are ASCE 7-22 unless another edition is named, and the Code Reference table gives the numbers for ASCE 7-10 and 7-16.

Key Features¶

• Region types for walls of buildings with h at or below 60 ft, walls above 60 ft, roofs, and parapets
• External pressure coefficients GCp read from the Chapter 30 figures for each zone and effective area
• Pressures for both internal pressure cases, with the zone figure a click away
• Any list of effective wind areas, with a row added for each element size you design
• GCp values shown beside the pressures when you want to check them

Adding the Section¶

1. Click the + beside the section tabs
2. Select Components & Cladding

The section starts empty. + Add C&C Region opens the list of region types.

C&C Region Types¶

The h ≤ 60 ft regions follow Part 1 of Chapter 30, which covers buildings with h of 60 ft or less. ASCE 7 uses the term low-rise building for a narrower group: h of 60 ft or less and not greater than the least horizontal dimension. Rooftop structures and equipment take their pressures from the Chapter 29 forces of Section 29.4.1 (Section 30.8).

Each region has a header with a three-dot menu (⋮) to duplicate or delete it.

Walls¶

The walls region takes the building geometry the figure needs:

Below the inputs, the region shows the internal pressure coefficient from General Requirements, the Edge Region Distance a, the wind directionality factor Kd, and the velocity pressure qh at the mean roof height. Click the zone figure to enlarge it.

Zones and Effective Areas¶

The design pressure table has a tab for Case 1 (+GCpi) and Case 2 (-GCpi). Each row is an effective wind area, with the pressure for every zone of the figure, positive and negative. The region starts with areas of 10, 20, 50, 100, and 200 sq ft.

• Add Effective Area adds a row; type the area of the element you are designing
• Show GCp Values adds the external pressure coefficient beside each pressure, for checking against the figure
• The trash button at the end of a row removes it

Roofs and Parapets¶

The Roofs region takes the roof shape, mean roof height, slope, and least horizontal dimension, and tabulates the pressures by roof zone for both cases. Include Overhang adds the overhang zones of the figure. In ASCE 7-22, only Figure 30.3-2A, for roof slopes of 7 degrees or less, has overhang curves; for other roofs, Section 30.7 takes the overhang coefficient as the roof GCp plus the GCp of the adjacent wall.

The Parapets region takes the parapet height and effective area, the wall zone below the parapet (4 or 5), the roof zone at the parapet (2 or 3), and the parapet porosity, and calculates the two load cases of Section 30.6: Case A for the windward parapet and Case B for the leeward parapet, each with positive and negative internal pressure.

Summary View¶

The summary on the right lists each region with its inputs, the coefficients, and the full pressure table for both internal pressure cases, with the figure reference for the coefficients. The outline button at the top jumps to a region.

Code Reference¶