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IS 4907:2004 is the Indian Standard (BIS) for method of testing timber connector joints. This standard outlines the procedure for testing timber connector joints under static loading. It specifies the requirements for specimen preparation, testing equipment, and loading methodologies to accurately determine the yield load, ultimate load, and slip characteristics of the joints.
! Ensure load is applied continuously and uniformly without shock to prevent premature failure of the joint.
! Moisture content of the timber must be tested immediately after failure by taking samples near the joint area, as moisture drastically affects structural strength.
! Dial gauges should be mounted symmetrically on both sides of the specimen to average out any eccentric or rotational slip during testing.
Standard Test Methods for Mechanical Fasteners in Wood
Sections 9 to 15 specifically cover testing bolted and timber connector joints, aligning closely with the IS code's scope.
AS 1649-2001 (R2016)Standards Australia, Australia
HighCurrent
Timber - Methods of test for mechanical fasteners and connectors
Provides test methods to determine strength and stiffness of joints with various connectors, including dowel-types.
ISO 6891:1983International Organization for Standardization
MediumWithdrawn
Timber structures — Joints made with mechanical fasteners — General principles for the determination of strength and deformation characteristics
Outlines general principles for testing, forming the basis for many modern standards, rather than a specific test method.
Key Differences
≠IS 4907 specifies a fixed rate of loading (head movement) of 2.5 mm/min, whereas ASTM D1761 specifies a slower rate of 0.03 in./min (approx. 0.76 mm/min), which can affect the observed load-slip behavior and ultimate strength.
≠The termination criteria for the test differs. IS 4907 requires the test to continue until the ultimate load is reached. ASTM D1761 allows termination either at ultimate load or when a slip of 0.5 inches (13 mm) is reached, whichever comes first.
≠IS 4907 provides prescriptive dimensions for test members based on connector size (e.g., 75 mm main member for a 65 mm ring). In contrast, ASTM D1761 is more performance-based, stating that member thickness should be that for which the connector is designed.
≠IS 4907 does not specify a minimum number of test replicates, stating 'a sufficient number'. AS 1649 is more prescriptive, requiring a minimum of five replicate tests for statistical validity.
Key Similarities
≈All standards utilize a similar fundamental test setup, typically a three-member joint (one main member, two side members) with the load applied axially in compression to evaluate the connector's shear performance.
≈A core requirement across all equivalent standards is the continuous measurement and recording of load versus slip (relative displacement between members) to produce a load-slip curve, which is used for analysis.
≈All standards acknowledge the critical influence of wood moisture content on joint performance, requiring tests to be conducted under controlled conditions (either 'green' or conditioned to a standard equilibrium moisture content, typically ~12%) and for the MC to be recorded.
≈The principle of measuring slip is consistent, involving monitoring the relative displacement between the connected wood members at points close to the connector to accurately capture joint deformation.
Parameter Comparison
Parameter
IS Value
International
Source
Rate of Loading (Head Movement)
2.5 mm/min
0.03 in/min (≈ 0.76 mm/min)
ASTM D1761-20
Test Termination Criteria
Continue until ultimate load is reached.
Continue until ultimate load or 0.5 in. (13 mm) slip is reached.
ASTM D1761-20
Minimum Number of Replicates
Not specified ('a sufficient number')
5
AS 1649-2001
Slip Measurement Precision
Accurate to 0.025 mm
Readings to 0.001 in. (≈ 0.025 mm)
ASTM D1761-20
Moisture Content Conditioning
Condition until weight change is <2% in 24h.
Condition to constant weight at specified temp/RH (e.g., 20°C/65% RH).
ASTM D1761-20
Test Specimen Assembly
Typically a three-member compression joint.
Typically a three-member compression joint.
ASTM D1761-20
⚠ Verify details from original standards before use
It provides a standardized method to evaluate the strength and slip modulus of timber joints connected via mechanical fasteners under static load.
What equipment is required to measure joint slip?+
Dial gauges or linear variable differential transformers (LVDTs) with a minimum least count of 0.01 mm are required.
Why is moisture content evaluation mandatory after the test?+
Timber strength and connector bearing capacity vary significantly with moisture levels, requiring the test results to be correlated with the moisture content at the time of testing.