THEORY AND EXAMPLES

IDEA StatiCa Connection – unique inovative solution

General model - CBFEM• Plates – elastic/plastic model, 5% strain• Bolts – standard bolts, preloaded bolts, anchors• Welds – elastic or plastic model• Contacts – one-way constrain between plates• Concrete for anchoring – contact stress, break-out cones

2

ANSYS/ABAQUS for everyday life….

There are 2 models in the application:• Structural (what we see)• Analysis (how it is calculated)And there is the Chinese wall between them

Analytical-scientific (CBFEM) engine is the core of the product, it is the must for the success. But it is also critical that it is hidden.

The key for success is the structural model based on manufacturing operations. Majority of engineers understand what is a plate or bolt and where they want to put it in the joint. It is no rocket science, it is daily life.

3

News in version 7.1

4

Overall presentation of all results on one picture is still missing.

Solution?Traffic lights!

Presentation of checks -> traffic lights

5Steel joints – where we are

6Steel joints – where we are

Presentation of checks -> traffic lights

7Přípoje – teorie a praxe

Presentation of checks -> traffic lights

WELDS

Welds are model by a special elastoplastic element which is added between the plates. The nonlinear material analysis is applied and elastoplastic behavior in equivalent weld solid is determinate. Ideal plastic model is used and the plasticity state is controlled by stresses in the weld throat section.

The results are significantly more accurate (long welds, not fully stiffened joints).Method of weld modeling from version 7.0 (and previous) can be still used for fast pre-design of complex connections.

New analysis model of welds with plastic behavior

9Steel joints – where we are

Why, where to use

……

Why we have two approaches

10Steel joints – where we are

New analysis model of welds with plastic behavior

11Steel joints – where we are

12Steel joints – where we are

EXAMPLEWelds – elastic and plastic model

BOLTS AND CONTACTS

Contact surfaces (elements)

14Steel joints – where we are

Contacts take 100% of pressure, but no tension.

Interaction tension-shear in the model of bolt

Result „Bearing“ Check in 7.0 Interaction formula v 7.0

Results „Interaction“ Check 7.1 Interaction diagram

15Steel joints – where we are

Tables of bolts checks

16Steel joints – where we are

We have reorganized bolts checks tables and separated them into groups:• Bolts• Preloaded bolts• Anchors

17

EXAMPLEBolts and contacts

TEKLA LINK

Tekla Structures – story behind the link

19

1st version developed in 4Q 2015

Continuous improvements for Tekla 21.0 and 21.1

Big change with TS 2016 – API adjusted, ribbon not working etc. (“setback”)

TS 2016i – solved most of the issues, caught up with changes

Know limitations/remarks, tips and tricks

Trimble/Tekla likes it by they do not like to work on it – it is all on IDEA and partially on Construsoft

Two-way link not in the near future

Tekla Structures – tips and tricks, limitations

20

Link now works for a wide variety of connections/joints. However, please take into account yet unsupported functionality:

Holes in membersImport the whole joint and manually add openings in IDEA StatiCa Connection.

Anchoring and base plateImport the whole joint and manually add base plate in IDEA StatiCa Connection.

Welded and composed cross-sections. Properly define cross-sections in Tekla

Welded and composed cross-sections General CSS are not supported yet.

21Steel joints – where we are

EXAMPLESTekla link

STIFFNESS

Rotational capacity of the connection

23Steel joints – where we are

Rotational capacity provides information about connection ductility and ability of seismic energy absorption. Its value is calculated for 15% plastic deformation and can be found in the results table.

24Steel joints – where we are

EXAMPLEStiffness

Stiffening member

25Steel joints – where we are

Segments of hot rolled or cold formed profiles can be used for stiffening of steel joint.

Stiffening members behave in the joint the same way as basic steel members – all manufacturing operations can be applied on them.

Stiffening members cannot take loads.

They are not a part of 3D global model of the structure.

PRELOADED BOLTS

Preloaded bolts – friction connections

Standard bolts transfer shear force by bearing.

Preloaded bolts transfer shears force by friction between plates into all directions around the bolt. The connection is much better from the point of view of deformations. On the other hand the resistance is lower.

IDEA StatiCa Connection check the limit state „slip“ in the model. The resistance is set in the moment of the slip. Limit resistance of the connection „after slip“ can be checked by bearing like for standard bolts.

27Steel joints – where we are

Standard bolt

Preloaded bolt

28Steel joints – where we are

Preloaded bolts – friction connections

29Steel joints – where we are

EXAMPLEPreloaded bolts

SEISMIC DETAILS

31Local mechanisms

Recommended Beam to Column Connections in moment resisting frames

Bolted beam flanges and web

Welded flanges and bolted web Reduced beam section

(dog bone)

Check of dissipative elements

Rotation Capacity of steel connection

32

Ductility U.S. Europe

Medium 20 25

High 40 35

Non-dissipative connections are designed on the bending moment calculated from the maximal capacity of connected (dissipative) member.

Check of non dissipative elements

Capacity Design

Will be in the upcoming release of the IDEA StatiCa.

33

𝑅𝑑≥1,1𝛾𝑜𝑣𝑅𝑓𝑦