SILVIA CONTI's Communities Activities

STATIC SEISMIC ANALYSIS

SILVIA CONTI — Fri, 07 Aug 2020 20:44:50 GMT

Good evening,

I need to perform static seismic analysis according to Eurocode Standard (evaluation of equivalent lateral forces of a structure at each level/floor). Is it possible with STAAD_Pro ? Is there a procedure to follow or some examples availabe?

Thank you,

SConti

STAAD PRO V22 - RESULTING OF APPLIED FORCES

SILVIA CONTI — Tue, 10 Nov 2020 09:42:36 GMT

Good morning,

I'm performing static analysis for a concrete sleeper (see the attached model). My question is if it possible to obtain form STAAD Pro output, the resulting of the applied forced at the bottom of the foundation slab for each load case or, for each load combination, the poin of application (for example referring to center foundation base) in order to check, trought hand calcultion sheet, the overturning, the bearing capacity of the soil and also slinding verification.

Thank you in advance,

Silvia Conti

communities.bentley.com/.../SLEEPERS-4000m-piu-caricata-_2D00_-Prova1.std

STAAD_Pro v22 - weight calculation

SILVIA CONTI — Tue, 22 Sep 2020 22:11:54 GMT

Good evening

I have performed a lifting analysis considering the attached model. With an hand calculation check, pipe weight results equal to 2816.18 kg (27.61 kN) for a lenght of 12m.

Performing STAAD Pro analysis, the following results is:

Not in compliace with my check. Please, see the attached model.

communities.bentley.com/.../30inch.STD

STAAD.Pro Concrete Desing

SILVIA CONTI — Tue, 15 Sep 2020 09:26:51 GMT

Good Morning,

I have tried to run an old STAAD model created with V8i licence where I performed concrete slab design according to ACI318 code.

Now, with my current version STAAD Pro Connect Edition V22, I don't manage any more. Is it necessary to request STAAD. Pro Advanced in order to perform concrete design (bending checks, cracking and also punching verification with ACI Standard and Eurocode)?

Which STAAD version can be considered more suitable for the porpoise?

communities.bentley.com/.../2021.Structure1.std

STAAD PRO TUTORIAL

SILVIA CONTI — Tue, 15 Sep 2020 09:03:18 GMT

Good morning,

I have tried to see some tutorial course, but I don't manage.

The following error message occours.

How can i solve it?

RESPONSE SPECTRUM MODAL ANALYSIS

SILVIA CONTI — Thu, 23 Jul 2020 09:26:59 GMT

Good morning,

I'm trying to perform response spectrum modal analysis with Response spectrum user define data option on a multistory concrete building. The porpoise is to introduce in the FE model, seismic actions according to Italian design code (NTC2018) or, at least, Eurocode.

The problem is to manage to introduce, for seismic calculation, also non structural loads (different from self weight) that are represented , for example, by member loads (distributed and/or concentrated) or nodal forces directly assigned to elements with the aim to make STAAD compute them as structural mass.

Is there a specified procedure to follow?

If consider the attached model, in the SEISM +X load case, I have defined:

- the self weight of the structure in X direction because I want to calculate seism effects in X direction;

- user defined response spectrum in X direction;

- distributed member load equal to 2 kN/m in X direction. Running the analysis, I have noticed that this load has not been considered in the calculation of structural mass and so in the evaluation of global seismic effects on the structure. Therefore, how can I define this load correctly in order to make it consider in seismic calculation?

Thank you, regards

communities.bentley.com/.../Response_5F00_Spectrum_5F00_Analysis.std

Silvia

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Wed, 29 Jul 2020 00:41:57 GMT

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Static Analysis VS Modal Analysis

SILVIA CONTI — Wed, 08 Apr 2020 14:15:04 GMT

Good evening,

I'm going to perform seismic calculation of steel pipe rack represented in figure below that has no rigid diaphragms (in horizontal plane) at each floor level

Which analysis can I run in order to simulate seismic actions on the structures in compliance with its dynamic characteristic?

Is it correct to perform static seismic analysis instead of modal analysis due to absence of rigid diaphragms even if its dynamic behavior, probably, is not dominated by the first structural dynamic mode?

Is in STAAD_Pro a nodal modal analysis implemented?

Thank you, regards

ACI318 SLAB DESIGN

SILVIA CONTI — Tue, 24 Mar 2020 14:50:17 GMT

Googevening,

performing concrete slab verification with staad pro (ACI Code), I noticed some discrepancies between input data definition, as reported below:

and output results obtanained from calculations are listed below:

in particular the following results report in STAAD_Pro output are not in compliance:

- concrete cover definition that must be equal to 75mm but staad defines cover at top and bottom equal to 19.05 mm

- concrete strength that must be 14.16 N/mm2 but staad defines 27.58 MPa

- steel reinforcement strength 450 N/mm2 but staad defines 413.68 MPa.

How these parameters are evaluated by STAAD?

How can I set in a correct way these input data?

Regards

Ask A Question II

Tue, 24 Mar 2020 12:00:29 GMT

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CONCRETE SLAB DESIGN PROCEDURE

SILVIA CONTI — Tue, 18 Feb 2020 16:29:28 GMT

Good evening,

in order to perform design of concrete slab/shell elements, which procedure is better to follow? Considering STAAD Pro options, it is possibile to consider two main ways:

1) SECTION MODELING - DESIGN - CONCRETE (as represeted below)

2) Selecting Concrete Design as indicated in figure reported below, where, for example, it possible to select more type of standard codes.

Therefore, I don't understand the difference between procedure 1) and 2). What is the best one and must be selected in order to design a concrete shell elements?

Thank you, regards,

Silvia

CONCRETE SLAB DESIGN OUTPUT UNIT OF MEASURE

SILVIA CONTI — Tue, 18 Feb 2020 15:57:25 GMT

Good evening,

I’d like to ask if it possible to change the unit of measure relating to STAAD concrete slab design, in particular, relating to longitudinal an transversal reinforcements as indicated below:

In the previous figure, the program gives the minimum steel reinforcement required expressed in mm^2 /mm. For convenience, I prefer to obtain results in mm^/m. Is there a command or a function to set in order to change output unit of measure?

Thank you, regard

Silvia

FLOOR LOAD ASSIGNMENT

SILVIA CONTI — Thu, 09 Jan 2020 16:50:32 GMT

Good evening

I’m writing to ask clarifications about floor load assignment in STAAD Pro. In particular, considering the figure reported below and according also with real structure behavior, I’d like to assign floor load only to transversal beams where grating loads are directed applied (please, consider one way distribution condition only to red beams where floor load must be applied) without assigning floor load to in plane bracing.

Is there a procedure in staad?

Regards

Silvia Conti

PLATE STRESS AT TOP AND BOTTOM SIDE

SILVIA CONTI — Thu, 28 Nov 2019 09:50:03 GMT

Good morning,

I have to make question about STAAD Pro output plate stress ; in particular, I'm going to make a post processor excel file aimed to design concrete reinforcement of a slab according to ACI Code. Is It possible, for each shell, to obtain stress at the bottom and at the top side?

Is there a procedure to follow or a command that allow to have plate stress output (Mx, My, Myx, Sx, Sy, Sxy, SQx, SQy) at each side of the slab?

Thank you, regards

Silvia Conti

SEISMIC STATIC ANALISYS

SILVIA CONTI — Wed, 04 Sep 2019 15:18:09 GMT

Good Morning,

I’m writing to ask clarification about STAAD Pro static seismic analysis to be performed in a drain pit structure (modeled with shell elements) as indicated below:

In particular, I have to generate automatically horizontal nodal forces due to earthquake considering in main direction +X, -X, +Z, -Z:

Structure self weight
Permanent weight on central slab due the presence of the equipment (2 kN/m2 in gravity direction but I’m not confident that the sign is correct)
Permanent weight due to soil vertical pressure applied only to external shells as represented in figure below (20 kN/m2 in gravity direction but I’m not confident that the sign is correct)

Therefore, I have considered the following procedure:

Definition of seismic input (Seismic definition item in load & definition list) specifying only self weight as follow:

Definition Load case detail as follow

SEISM +X

SEISM –X

SEISM +Z

SEISM –Z

HORIZZONTAL PRESSURE DUE TO SOIL

VERTICAL PRESSURE TO EQUIPMENT (CENTRAL SLAB)

VERTICAL PRESSURE TO SOIL WEIGHT (EXTERNAL SLAB)

In this first phase, to evaluate structural results, I have create only one load combination:

To simulate foundation interaction with soil, I have consider support for foundation (winkler methodology) which properties are represented in figure below:

If I run analysis, I note that there are support with negative reactions that are not in compliance with soil spring model (spring must be compressed and not in tension) with the following warning message:

How can I eliminate tension springs?

(figure with tension springs)