XBRACING screenshot
DEVELOPER :Alex Tomanovich
PLATFORM :Spreadsheet
LICENSE :Freeware
DOWNLOADS :UserDownloads:1220
XBRACING Description

XBRACING is a spreadsheet program written in MS-Excel for the purpose of analyzing X-braced bents with tension-only systems. From 1-story up to 10-story bents may be analyzed. Specifically, given the bent width, the story heights, and the lateral story loads, all the member (segment) forces are determined, as well as the horizontal and vertical reactions at the supports, and the individual story drifts (horizontal deflections).

This program is a workbook consisting of eleven (11) worksheets, described as follows:

  • Doc - Documentation sheet
  • X(1) - Analysis of 1-story bent with tension-only X-bracing
  • X(2) - Analysis of 2-story bent with tension-only X-bracing
  • X(3) - Analysis of 3-story bent with tension-only X-bracing
  • X(4) - Analysis of 4-story bent with tension-only X-bracing
  • X(5) - Analysis of 5-story bent with tension-only X-bracing
  • X(6) - Analysis of 6-story bent with tension-only X-bracing
  • X(7) - Analysis of 7-story bent with tension-only X-bracing
  • X(8) - Analysis of 8-story bent with tension-only X-bracing
  • X(9) - Analysis of 9-story bent with tension-only X-bracing
  • X(10) - Analysis of 10-story bent with tension-only X-bracing

Program Assumptions and Limitations:

1. This program assumes that the vertical bent is fully braced, between every story, utilizing a tension-only X-bracing system.

2. In a tension-only bracing system, one brace is assumed effective in tension while the other brace is assumed to buckle (in compression), requiring the tension brace to take all of the load.

3. This program uses the "Method of Virtual Work" to determine the horizontal deflections at each of the story levels. The horizontal deflection at a particular story level is determined by first applying a "dummy" unit load at that level. Then, the member forces from the unit load are determined. With the member forces due to the applied lateral loads already having been calculated, the horizontal deflection at that story level is:

Dn = S F*u*L/(A*E)

where:Dn = horizontal deflection at particular story level number considered (inches)

F = force in each member due to all applied lateral story loads (kips)

u = force in each member due to unit load applied at paricular story, 'n'

L = length of each member in bent (inches)

A = area of each member in bent (in.^2)

E = modulus of elasticity of members in bent, all assumed equal (ksi)

The horizontal deflections (story drifts) determined are for the joints at the left side of the bent, with all members (segments) assumed pinned at both ends.

* XBRACING download link provides freeware version of the software.

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