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If you have an existing light source and you add another new light source over the existing, are the foot-candle readings cumulative

I have a simple question concerning the results of RISA analysis as follows. I have a single story framing system and the axial load between the top of the column and the bottom of the column is consistently 3.245 kips; however, my column only weighs .431 kips and there are no other additional...

I am in the process of evaluating light fixture hangers that are ~10 to 20 years old. Is there a particular code and/or design standard associated with the evaluation of existing hangers or the requirements for new hangers (i.e., material, safety factors, etc.)?

I am currently in the initial stages of design for a small (~8 ft dia.) rotating light platform that will be protected from direct contact with weather elements, however, this system must be very reliable with very minimal need for servicing/maintenance due to very restricted access conditions...

I am currently in the initial stages of design for a small (~8 ft dia.) rotating light platform that will be protected from direct contact with weather elements, however, this system must be very reliable with very minimal need for servicing/maintenance due to very restricted access conditions...

Is there a way to insert penetrations into a large concrete wall panel within RISA or do you have to "build" the model around each penetration?

We are working on a project with concrete walls (~18" thick) that are 16 feet tall to support roof trusses over a bulk materials handling area. These walls are to be designed as potential push walls from front end loaders. Any thoughts on the spacing of both vertical (and potentially...

Are control joint spacing requirements the same for interior walls as for exterior walls?

I am working on a project that has an interior CMU wall system that is supporting 12" deep steel joists spaced on 24" centers for a mezzanine floor. These walls intersect into other CMU walls that do not support joists. As suc, the elevations are established. The joists ends are to bear on...

I am in the process of designing the support system for the attachment of a Hubbell secondary rack unit. The ANSI document pertaining to the design of secondary racks indicates that for a deadend condition, the maximum load per insulator is 3,000 pounds. The particularly rack that our client...

Project in NYS with an interior scaffolding system that will be utilized for large vehicle maintenance activities. This system will be mobile with select portions that are non-mobile. This is not a temporary structure. Any thoughts/direction regarding: 1. Seismic design requirements. 2...

I am in the process of beginning to perform a field evaluation of a 40 year old, 3 pipe column, sign structure that is approximately 50 feet in height. I have a preliminary procedure in performing this work, however, I was wondering if anyone has any links to references associated with field...

I have completed the entry of members, loads, etc. and are in the initial process of running a batch solution for the model. I am receiving the following error: Error Code 1048 - No eligible members found in plane of area load. Unfortunately, I cannot decipher where this area is occurring. Any...

Does anyone know of an actual design reference, guide or book pertaining to poured gypsum roof decks?

Working on a project where the existing building is constructed of light steel frame members and wood exterior panels. The client wants to install an overhead crane system (~38 ft long; 15ton capacity) within the existing building. The building clearance is limited. Thinking about bracing the...