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[highlight #FCE94F]You only mentioned 1 out of 5 walls for this "room" in this problem. Without the other 5, we don't know enough to begin. Also, the fabric temperature is (almost) meaningless compared to the room average air temperature. [/highlight] Assume that the other walls, ceiling are...

Hi, Maybe someone can point me in the correct direction, I am a structural engineer with a small thermal problem. I have a large section (50'x 50') of tensioned fabric membrane (very thin, R = 0.6) that provides a boundary between the interior and exterior of a small building (acts as a...

This is the first time I have run ABAQUS explicit. Naturally, I want to check the ABAQUS results against hand calculations when I can. In this particular model, I have a simple rectangular plate, pinned boundary conditions on all 4 sides and a non-dynamic uniform load applied (load is applied...

I am currently involved in modeling a large inflated structure. The structure wind coefficients were obtained from wind tunnel testing. In reviewing the wind tunnel testing report, the author explains that a ASCE wind requirement of say 160 mph 3 sec gust at 10 meters needs to be adjusted...

Well, I am going to ask the question: Why have an IBC (INTERNATIONAL Building Code) ? I do not practice in the traditional structural engineering field, and I thought that IBC was a world wide code adopted by other countries. Is this not true ? Thanks.

I have a few projects where I need to select design wind speeds in foreign countries - Italy, Greece, Turkey, etc.. In looking at the wind provision of the IBC - they refer to the ASCE-07 code. No problem, but ASCE 07 has wind contours for the US only. Where can I get design speed wind...

I read that Kevlar degrades at about 800 deg F. This info is all over the www. What I need to know is as the temperature approaches the 800 deg F limit, does the Kevlar change strength / tensile properties ? If I expose Kevlar to 700 deg F for 10 min and then quickly return it to room...

I have a building that is shaped like a cylinder split down the middle – 1/2 cylinder - placed on its side. THe building is about 180 ft long. The problem is to find the wind coefficients at the building ends when the wind is acting along the cylinder axis (parallel to the cylinder long...

I am building a pressure system made up of 2 blowers mounted onto a metal skid assembly. What is the proper method to gound the blowers onto the skid using a standard ground lug ? I am asking what sequence of components (washer, star washer, ground lug, lock washer, etc..) should I use when...

I am using the 2025 model Dwyer gage in a 1/4" dia tube system that can be in tube lengths of 50 ft to 600 ft. I would like to know what tubing diameter allows the Dwyer gage to show changes in pressure when the changes in differential pressure are as small as 1" water pressure. My...

Hello, I am presently involved with measuring the stress strain relationship of a pretensioned sample of fabric material. Needless to say, the strains that I measuring are much larger than typically seen for aluminum and steel. Since the strains are "larger", it occurred to me that possibly I...

I am running a static stress analysis interested in stresses with a side interest in displacements. The element is membrane type - i.e. no bending stress. Material is not modeled as a composite - it is modeled as an Orthotropic type.

Is there any guidelines on when the tangent and when the secant modulus should be used in modeling ? I am modeling fabric material so the behavior is non-linear but several people at my office think tangent modulus should be used whereas others think secant modulus should be used in modeling...

I have a question related to wind pressure coefficients presented in the ASCE/SEI 7-05 - Minimum Design Loads for Buildings and Other Structures. My question relates to the wind pressure coefficients that are defined in this document for standard rectangular buildings. In a typical wind tunnel...

I am in the process of checking a HVAC system for seismic requirements per IBC 1621.3 - a customer requirement. However, in looking at the IBC 2006 document, I do not se 1621.3 anywhere. Does anyone know what was the last year section 1621.3 was included in the IBC for seismic loading ?

I am involved in using fabric materials for making large structures. Fabric tensile strength after UV exposure is required to determine the amount of material property degradation as a function of UV exposure. At present we just set some samples on a QUV machine for a few thousand hours and...

I have searched the internet and see LOTS of "high-build organic coating systems" - Can anyone recommend a specific "high-build organic coating system (probably with a zinc-based primer or thermal spray base layer)" ? Is there an ASTM that provides a standard for the high-build organic...

For years I have used the ASTM A123 standard for Zinc coating my exposed structural steel materials (angle sections, etc..). I just learned that an alternative method is ASTM B695-04 - Standard for coatings of Zinc Mechanically Deposited on Iron and Steel. Apparently, this ASTM standard...

SDZ, True that 180 mph occurs very infrequent. However, even if it occurs 2 times in 12 years, 8% of the total fatigue life is used. This being a soft joint is resulting in the pretension load being added to the induced wind loading. If this joint were a hard joint, the preload could be made...

I agree, for normal building structure construction, wind does not become important. The reason is that the joint is a RIGID joint. So, as long as the preload is high and is greater than the service load stress range, no additional effort is required on the joint design. My problem described...