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Laboratory report _ Title: Compressive & Bending tests of steel and timber

Name
Student Number
Group No.
Subgroup No.
Module Name	Construction Materials
Module Code	CN117

1. Compressive tests:

1.1 Steel Cylinder
Diameter (mm): …………… Height (mm): ……………	Results Load at yield (kN): ……………

1.2 Timber
Loading direction parallel to the grain	Loading direction perpendicular to the grain
b (mm): …………… d (mm): …………… h (mm): …………… Results: Maximum load (kN):……………	b (mm): …………… d (mm): …………… h (mm): …………… Results: Maximum load (kN) ……………

2. Bending tests

Bending Load (P)= Load cell 1 + Load cell 2

Steel beam	Timber beam
a (mm): …………… b (mm): …………… t (mm): …………… beam length (mm): …………… span length (mm): ……………	c (mm): …………… d (mm): …………… beam length (mm): …………… span length (mm): ……………

List of contents:

The contents of the 2nd lab report should include the items listed below:

Detailed calculations for all the questions must be provided in the report.

1. Compressive tests:

Calculate the following:

1.1 Compressive yield stress of steel. ( 10%)

1.2 Compressive strength (maximum stress) of timber for loading direction parallel to the grain. ( 10%)

1.3 Compressive strength (maximum stress) of timber for loading direction perpendicular to the grain. ( 10%)

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In addition to the detailed compressive strength calculations for timber (ii & iii), it is essential to provide adequate information about the loading direction. In your final report, include one of the following figures (1, 2 or 3) before the strength calculations for loading direction parallel to the grain (ii), and another one (1, 2 or 3) before the strength calculations for loading direction perpendicular to the grain (iii). This will indicate the loading direction of the specimens tested in the lab.

1.	2.	3.
Loading surface ( b d)	Loading surface ( d h)	Loading surface ( b h)

2. Bending tests

2.1 Plot the load-deflection diagram of the steel beam tested in the lab. (15%)

2.2 Calculate the stiffness () of the steel beam tested in the lab. (10%)

2.3 Plot the load-deflection diagram of the timber beam tested in the lab. (15%)

2.4 Calculate the stiffness () of the timber beam tested in the lab. (10%)

2.5 Find the stiffness (K’timber) of a timber beam with a hollow cross section equal to the one of the steel beam tested in the lab, and the stiffness (K’steel) of a steel beam with a ‘solid’cross section equal to the one of the timber beam tested in the lab (considering that the loading setup remains the same). (20%)

Timber beam with a hollow cross section	Steel beam with a ‘solid’ cross section
K’timber = ?	K’steel = ?

For this question and for beams with exactly the same cross section (and same loading setup) the following equation can be used:

where:

Ktimber: is the stiffness of a timber beam,

Ksteel: is the stiffness of a steel beam,

Etimber: is the modulus of Elasticity of timber - For this question Etimber=10 GPa,

Esteel: is the modulus of Elasticity of steel - For this question: Esteel=200 GPa .

Solution

Laboratory report _ Title: Compressive & Bending tests of steel and timber

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