Things need to consider in trusses inspection for civil and structural engineer

When the design of prefabricate trusses have been approved. It will under go fabrication in factory. Upon completion of fabrication of trusses,Guest Posting it will deliver to site for construction. As a civil and structural engineer, one of the duty of engineer is to inspect the trusses.

Engineer has to make sure the design of trusses (theory) has been properly transfer into actual product.

When trusses deliver to site, site agent or engineer needs to verify the quality of timber product. Timber has to be treated to avoid attack by termites. Normally the color of pressure treated wood is in green color. Moreover, whenever a section of timber is being cut, it will show that the green color chemical will penetrate from surface of timber into it. Certificate of treated timber must be obtained from supplier for record purpose.

Then timber trusses have to check on the timber defect such as rotten timber, damage timber. Any defect found must be rejected immediately. Such check mainly by visual inspection. In found any suspect member, engineer can request for sample testing to any approved laboratory.

Further from what mention above, engineer needs to check the timber sizes. It to ensure that the sizes provided are according to trusses design sizes. This can carry out by using measuring tape. Sometime, it is impossible to insect every single item of timber. Therefore, engineer has to use based on his best knowledge to has randomly sampling inspection. One of the way is to inspection on the critical trusses.

Whenever, the connection of trusses is done by bolts and nuts. First, engineer must visually inspection the bolt holes. It is common that contractor simply open the hole for bolting, until sometime the hole just at side of timber member such as 5-10mm from edge of member. This hole will easy loosen out from timber and affect the integrity of timber truss structure. The position of bolt holes on timber is important. It must according to truss design.