Mass eccentricity
Mass eccentricity
(OP)
Anyone ever heard of studies made on structures with mass eccentricity, i.e. the center of mass of adjaent floors do not have the same location???
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Mass eccentricity
Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...
RE: Mass eccentricity
RE: Mass eccentricity
Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...
RE: Mass eccentricity
I do not understand the question. Regularly, buildings are analyzed and designed with the mass not at the same location on all floors. The location of the center of mass for each level must be considered in the analysis.
RE: Mass eccentricity
It's a condition that would generally disqualify a building for the simplified equivalent static method of seismic analysis under the Canadian Building Code. Seismic response would generally be the big issue for me.
RE: Mass eccentricity
In the codes, you have certain criteria that define each irregularity. For example, the torsional sensitivity irregularity is defined by the B factor. If the latter is greater than 1.7, then the structure is considered torsionally sensitive and it was shown that it cannot be satisfactorily analysed by the ELF method. This particular definition was developed of stiffness in-plan irregular structure. But what about the in-plan mass eccentric systems? Is there a value ( max eccentricty expressed as a % of the plan dimension of the floor) that was found and that allows to make the difference between a mass eccentric torsionally sensitive and non-sensitive system?
Hope it is clearer now, let me know if you have any questions... Or if you have an answer!
RE: Mass eccentricity
Being defined this way means that it takes into account both eccentricity due to location of load and eccentricity due to location of resistance. The two items can't really be looked at independently anyway, since it's the relation between the two locations that creates the torsion to begin with. Don't forget to include any code required additional assumed eccentricity when you're checking this.