Designated Seismic Systems – Where and How it’s used ?

Designated Seismic Systems –  Where and How it’s used ? The term “Designated Seismic Systems” – where and how it is used in our codes and standards – has caused a certain amount of confusion. The purpose of this article is to dispel that confusion – to the extent possible. In the 2012 IBC, the […]

[Part 2] Step by Step Analysis Procedure of Seismic Loads Based on IBC2012/ASCE7-10

[Part 2] Step by Step Analysis Procedure of Seismic Loads Based on IBC2012/ASCE7-10 After the huge response of the first article of [Part 1] Step by Step Analysis Procedure of Seismic Loads Based on IBC2012/ASCE7-10 , here we go with the second part of the article . In the first part of the article, we have elaborated the […]

When does a mezzanine need to be considered a story for seismic design ?

When does a mezzanine need to be considered a story for seismic design ? Mezzanine is defined in 2012 IBC Section 202 as “An intermediate level or levels between the floor and ceiling of any story and in accordance with Section 505.”  2012 IBC Section 505.2 requires: “The aggregate area of a mezzanine or mezzanines […]

[Part 1] Step by Step Analysis Procedure of Seismic Loads Based on IBC2012/ASCE7-10

[Part 1] Step by Step Analysis Procedure of Seismic Loads Based on IBC2012/ASCE7-10 Check  also [Part 2] Step by Step Analysis Procedure of Seismic Loads Based on IBC2012/ASCE7-10 First of all, I would like to thank all our followers and engineers who were motivating us with the good feedback of our content. After a long detailing […]

Why do Buildings Sink into the Ground during Earthquakes?

Why do Buildings Sink into the Ground during Earthquakes? What is Liquefaction of Soils? A special situation arises during earthquake shaking in sandy (cohesionless) soils that are loose and saturated with water. Horizontal shaking of the earth at the bedrock level is transmitted upwards to overlying layer(s) of soil. Saturated loose cohesionless soils have voids between soil particles filled with water. […]

IBC/ASCE 7 Seismic Provisions for Seismic Design Category A Structures

IBC/ASCE 7 Seismic Provisions for Seismic Design Category A Structures Did you know that if a structure is assigned to Seismic Design Category (SDC) A, you need not comply with the seismic provisions subsequent to ASCE 7-10 Section 11.7? In fact, you will not find mention of SDC A in any section after Section 11.7 […]

How can Non-structural Elements be protected against Earthquakes?

How can Non-structural Elements be protected against Earthquakes? How can Non-structural Elements be protected against Earthquakes? Non-Structural Elements Structural Elements (SEs) in a building have a primary role of resisting the effects of earthquakes ground shaking, and of protecting life and property of building occupants. But, buildings contain many other items, such as contents, appendages […]

What Harms Load Paths in Buildings?

What Harms Load Paths in Buildings? Buildings with Moment Resisting Frames Smooth transfer of inertia forces in a Moment Resisting Frame (MRF) building is critically dependent on the geometry of the frame grid. Some desirable features of a frame grid include: (a) Several distinct planar, regular MRFs placed parallel to each other, in each of […]

Risk Category: What’s It All About?

Risk Category: What’s It All About? Table 1604.5 of the 2012 IBC sets forth Risk Category descriptions for buildings and other structures. The basic underlying principle in assigning Risk Category is to recognize the impact of a structural failure. An obvious illustration of this is the very different impacts of structural failures of an uninhabited […]

Why are Load Paths Important in Buildings?

Why are Load Paths Important in Buildings? What are Load Paths? Mass is present all through in a building – from roof parapet to foundation. Earthquake ground shaking induces inertia forces in a building where mass is present. These inertia forces are transferred downwards through horizontally and vertically aligned structural elements to foundations, which, in […]

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