5. Phase 4 - Reporting
Phase 4 concerns the final assessment of the existing situation. For NLTH, in this phase the NLKA is performed for the NSCEs which were left out of the FEM-model. Only in case of an object with monumental status the BSC report will be created in this phase, and will only contain the results of the performed analyses without strengthening. For other objects it is advised not to generate the report yet.
Figure 5.1 Phase 4 - Reporting.
Note
For each phase, various steps need to be performed. The number assigned at the left side of the step description is used to identify the step and to link it with the corresponding item in the python-script. It is not necessary to perform the steps in the presented order. However all steps in a certain phase should be completely finished before moving forward to the next phase.
5.1. Step A9: NLKA
Both structural and non-structural elements of the building should be evaluated for the seismic actions in the out-of-plane (OOP). In the OOP assessment, the element is evaluated to observe if it can sustain seismic load due to its own weight in its weak direction. The OOP for structural and non-structural members of the building should be calculated in a separate table, because they correspond to different return periods and the consequences of failure might be different.
Regarding non-structural elements, in The Netherlands, cavity walls are common (example: terraced houses largely widespread in Groningen). A cavity wall consists of two walls (named leaves) separated by a cavity of usually 80 mm to 100 mm. The inner leaf is generally made in calcium silicate bricks and the outer leaf is made usually in clay bricks (this is the wall viewed from the outside of the building). The inner and the outer leaf are then connected by wall ties in order to act together as one wall, but in most of the cases, due to the age of the building, the wall ties can be damaged and corroded, and therefore not sufficient anymore (good state of anchors should be assessed by inspections). In NLTH they are other non-structural risky elements to evaluate for the OOP are chimneys and gables.
The procedure to perform the NLKA is described in the how to guide: NLKA for PSSE assessment
5.2. Step R2: Engineering report
Note
Currently this step only needs to be performed when the object has a monumental status. In all other situations it is advised not to generate the report yet, to utilise the full automation for the TVA phase.
Refer to Overview and Instruction of
the Reporting guide for information on this step of the reporting process. The
viia_create_report() function has been developed to automatically get the right
templates and insert some object-specific information. Consult
Automated Reporting for information on how to use this function. Do not
yet generate the report if you have measures (or if you’re uncertain).
Note
If your object does not need strengthening, you can continue directly with Step R2 for TVA (see Reporting Overview).
5.3. Step C3: Review (peer/lead)
Note
Only when the object has a monumental status the BSC is created and only requires review if the report is sent to the client.
Once the first draft of the BSC is ready, the document is to be reviewed by another VIIA project engineer. After the review of the document, modifications or corrections are to be done and agreed upon. Once the peer review is concluded, the document is sent to the lead engineer, he/she will provide additional feedback.
After completing all the steps of the BSC reporting model phase you can continue working on the ‘Strengthening phase’.