## A Structural Engineers Practical Guide To Seismic Design: Fundamental Period

A Structural Engineers Practical Guide To Seismic Design: Fundamental Period You can determine the approximate fundamental period of a structure from ASCE 7 Eqs. 12.8-7, 12.8-8, or 12.8-9. The type of SFRS you have will determine what equation you use. The approximate period helps determine initial loading. Your computer model…

## Modulus of rupture

According to ACI 318-19 For fy exceeding 550 MPa, the calculated deflection limits in 8.3.2 shall be satisfied assuming a reduced modulus of rupture fr =0.41(fc’)^0.5 . Note that fr used in CSI Programs like (SAFE) equal 0.33(fc’)^0.5 this value is recommended by ACI 435R-95 when using FEA.

## Slab design by sheet Excell according program results of M1-1 and M2-2

If an Engineer like to design Slab by sheet Excell according program results of M1-1 and M2-2 only with ignoring M1-2 should set M1-2 Modifier equal zero, is this a proper solution? ACI -447-18: Design Guide for Twisting Moments in Slabs give the answer for this question , yes set…

## What is the difference between membrane and shell in ETABS?

Not just ETABS. This is a global differentiation in all the finite element software. Membrane elements are used to represent only inplane stiffness of members. It acts like the bedsheet on your bed. The bedsheet does not have any kind of bending stiffness and so it bends without any resistance.…

## An ETABS file of a 40 story tower was shared with the problem.

An ETABS file of a 40 story tower was shared with the problem. The advance solver cannot run P Delta, the standard solver cannot complete the run for more than 48 hours run time…modal results were not seen…. The engineer tried to run the analysis for more than a week…also…