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Evidence Guide: AHCARB804 - Analyse tree structure and biomechanics

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

AHCARB804 - Analyse tree structure and biomechanics

What evidence can you provide to prove your understanding of each of the following citeria?

Determine existing physical loads and strengths of trees, branches and anchorage

  1. Determine existing physical loads affecting trees
  2. Identify source and factors causing stress on trees
  3. Assess root plate environment and history for damage
  4. Assess history of pruning operations to above and below ground components
  5. Determine presence and extent of defects on trunk and root system
  6. Assess strength and material properties of tree structural components
  7. Determine wind environment of tree
  8. Determine surface area of structure exposed to wind
  9. Determine crown surface area exposed to wind
  10. Assess aerodynamic drag factor of tree crown
  11. Estimate primary loads occurring in seasonal climatic events
  12. Determine wind-load of prevailing stormy weather
  13. Determine load and drag associated with saturated foliage
Determine existing physical loads affecting trees

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Identify source and factors causing stress on trees

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess root plate environment and history for damage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess history of pruning operations to above and below ground components

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine presence and extent of defects on trunk and root system

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess strength and material properties of tree structural components

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine wind environment of tree

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine surface area of structure exposed to wind

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine crown surface area exposed to wind

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess aerodynamic drag factor of tree crown

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Estimate primary loads occurring in seasonal climatic events

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine wind-load of prevailing stormy weather

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine load and drag associated with saturated foliage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine structural integrity by static load testing

  1. Determine static load on trees for structural integrity testing and estimate wind-equivalent load
  2. Calibrate static load testing instruments according to manufacturer instructions
  3. Conduct static tests according to instrument instructions and analysis procedures
  4. Monitor loads and forces on trees to ensure safe limits to prevent damage
  5. Record data from static tests according to workplace procedures
  6. Compare data with benchmarks obtained from stable tree populations
  7. Prepare a report on structural integrity testing of tree from the static load tests
Determine static load on trees for structural integrity testing and estimate wind-equivalent load

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calibrate static load testing instruments according to manufacturer instructions

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Conduct static tests according to instrument instructions and analysis procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Monitor loads and forces on trees to ensure safe limits to prevent damage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Record data from static tests according to workplace procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Compare data with benchmarks obtained from stable tree populations

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare a report on structural integrity testing of tree from the static load tests

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine tree dynamic response

  1. Investigate tree biomechanics using dynamic methods of analysis
  2. Review complex models of tree dynamics analyses
  3. Calculate mass of branches of tree to determine degree of open-grown
  4. Calculate vector of force on tree
  5. Determine tree dynamic response under defined wind loads
  6. Prepare a report on structural integrity testing of tree from dynamic load analysis
Investigate tree biomechanics using dynamic methods of analysis

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Review complex models of tree dynamics analyses

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate mass of branches of tree to determine degree of open-grown

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate vector of force on tree

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine tree dynamic response under defined wind loads

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare a report on structural integrity testing of tree from dynamic load analysis

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate and consolidate structural integrity data and create a structural integrity report

  1. Investigate level of contribution of material properties in tree dynamics
  2. Investigate dynamic effect of branches on natural oscillation frequency and damping effect
  3. Determine level of contribution of form and morphology in tree dynamics
  4. Review suitability of invasive and non-invasive methods of testing
  5. Evaluate and determine likelihood of structural failure
  6. Confirm level of anchoring potential of root system and stability of tree
  7. Prepare a structural integrity report and provide to client
Investigate level of contribution of material properties in tree dynamics

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate dynamic effect of branches on natural oscillation frequency and damping effect

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine level of contribution of form and morphology in tree dynamics

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Review suitability of invasive and non-invasive methods of testing

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Evaluate and determine likelihood of structural failure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Confirm level of anchoring potential of root system and stability of tree

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare a structural integrity report and provide to client

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

An individual demonstrating competency must satisfy all of the elements and performance criteria in this unit.

There must be evidence that the individual has analysed the structure and biodynamics of a minimum of five different trees, including performed the following:

five static load tests, and

five dynamic load analyses.

There must also be evidence that the individual has:

determined existing physical loads affecting trees

identified areas of high stress on trees and the factors that affect these areas of high stress

assessed root plate environment for damage

assessed history and effect of tree pruning operations on tree roots and stems

determined presence and extent of tree defects

assessed strength and material properties of tree structural components

determined wind environment of tree

determined surface area of structure exposed to wind

determined crown surface area exposed to wind

assessed aerodynamic drag factor of tree crown

estimated primary loads occurring in seasonal climatic events

determined wind-load of prevailing storms

determined load associated with saturated foliage

determined static load on trees for structural integrity testing as an estimate of a wind equivalent load

calibrated static load testing instruments

conducted static tests that must include:

loads to the tree

measures the trunk strength

assesses root plate anchorage

monitored loads and forces using electronic equipment

monitored trees to ensure loads are kept within safe limits to prevent damage

maintained records of all data from static tests

compared data against benchmarks from stable tree populations and prepared a report on structural integrity testing

investigated tree biomechanics using dynamic methods of analysis

reviewed complex models of tree dynamics analysis

calculated mass of branches to determine degree of open-grown form of tree

calculated vector of force on the tree

determined tree dynamic response under defined wind loads

investigated level of contribution of material properties in tree dynamics

investigated the dynamic effect of branches on frequency and damping

determined the level of contribution of form and morphology in tree dynamics

reviewed suitability of invasive and non-invasive methods of testing

evaluated and determined likelihood of structural failure

confirmed level of anchoring potential of root system and stability of tree

prepared a structural integrity report and provided to client.

An individual must be able to demonstrate the knowledge required to perform the tasks outlined in the elements and performance criteria of this unit. This includes knowledge of:

tree dynamics and impact of tree form and morphology

tree stability and physical loads affecting trees, particularly in high stress environments

root plate environment, including:

depth and consistency of soil

spatial limitations

site excavations and potential damage

arboricultural activity and impact on tree structure and stability, including:

pruning operations to branches and roots

presence and impact of defects on tree structure, including:

extent of decay and damage of trunk and root system

assessment of strength and material properties of structural wood

biomechanical impact of wind on tree structure, including:

seasonal wind patterns, and tree exposure

surface area and tree structure

aerodynamic drag factor of tree crown in relation to trunk diameter and extent of hollowness

estimation of primary loads occurring in seasonal climatic events

severe wind-load due to storms and extreme weather conditions

load associated with rain and snow saturated foliage

additional drag associated with saturated foliage

open-grown form of tree

testing principles for static load, including:

use and purpose of a static load on trees during structural integrity testing as an estimate of a wind equivalent load

calibrating static load testing instruments

limits of structural safety during a static testing

measurement of trunk strength

invasive and non-invasive methods of testing trees

assessment of root plate anchorage in the ground

methods and reasons for monitoring loads and forces on trees, including:

electronic monitoring

monitoring of tree to ensure loads are kept within safe limits

value and purpose of benchmarks obtained from stable tree populations

tree biomechanics studies using dynamic methods of analysis, including:

simple models of tree dynamics

complex models and finite element analyses

multimodal approaches representing dynamics of branches on trees

calculations required for structural and biomechanical assessments of trees, including:

mass of branches

vector of force on trees

tree dynamic response

wind velocity and direction

statistical analysis and interpretation of test results

dynamic effect of branch movement on tree stability and failure rate, including:

oscillation frequency

energy dissipation and damping effect of canopy structure

likelihood of structural failure

level of anchoring potential of root system

stability of tree

records and reporting procedures for analysis of structural integrity testing.