Introduction

ProtaStructure calculates non-structural member forces
according to EC8 Chapter 4.3.5.

In the current document, calculations details about non-structural
members earthquake force and parameters such as seismic coefficient are
explained.

Building Model Details

Ensure that Building Analysis is successfully completed.  Check and verify the analysis results is correct using procedures in this article :  Building a Model Guideline

User Interface

1. The Non Structural Member Force Calculator will be launched. 

1. The other parameters such as seismic coefficient and member forces are calculated according to EC8 Chapter 4.3.5
   

S          :
Soil factor

T_a           :
Fundamental vibration period of the non-structural element

T₁           :
Fundamental vibration period of the building in the relevant direction

z          : Height of the non-structural
element above the level of application of the seismic
   action
(foundation or top of a rigid basement)

H         :
Building height measured from the foundation or the top of a rigid basement

Seismic Force

According to EC8 4.3.5.2 (2) horizontal seismic force, F_a, is defined as,”
the horizontal seismic force, acting at the center of mass of the
non-structural element in the most unfavorable direction”. Calculation details
are given in subclause 4.3.5.2 (3) which states the formula (4.24)  given below.

S_a        : Seismic
coefficient applicable to non-structural members