Measuring Floor Deflection

Hello i am designing a 34 feet simply supported floor steel beam with a uniform load and a number of point loads on it including two 13 kips loads in the mid span areas.

Measuring floor deflection. When it s time to get new flooring fitted excitement can sometimes be mixed with dread. Daunting prospects include moving all the furniture out and thereby discovering exactly what s been lurking behind the couch for 10 years but before even that there is the measuring up to do. See the table below. I know it will be the servicability criteria which would govern the design of this beam plus the.

Floor deflection test molly the deflection has to be measured along any span within the area of the floor. I use a dial indicator with a 1 inch travel for measuring deflection accurately. Have an engineer or someone who can calculate the predicted deflection using the load span joist size species etc. You re looking at the difference in height where the laser level may show an exterior wall up 1 2 and the interior dividing wall down 1 2 that s a difference of 1 in level across the floor.

25 50 mm measuring ranges. So for my 28 edge with a 5 aileron the manufacturer recommends 16 degrees at low rate and 23 degrees for high. Typically the test is done with a 50 pound weight centered between joists or supports. Zaralynda you assume that the level of the floor doesn t change significantly from one side of the wall to the other.

The live load will depend according to the floor. Where equals the deflection of the surface equals the length of the surface from hinge line to trailing edge and equals the angle of deflection in degrees here is a picture to help explain. 1 25 mm and 2 5 mm. Take the dread and doubt out of the scenario with our handy guide to help you calculate for.

For example the allowable deflection of a 12ft span floor joist with plaster l 360 is 0 4 12ft divided by 360. Load the floor with a known load at mid span or uniformly along the joist. Allowable floor beam deflection nickky structural op 9 dec 10 02 01. To come up with the deflection limit divide the joist span length with a number.

Most of the time the length is divided by 360 inches. The world s easiest astm e1155 aci 360 r 10 compliant floor flatness levelness joint deflection measurement system brought to you by the somero matson group. If that same joist had gypsum ceiling l 240 the allowable deflection is 0 6. With gauge lengths of 1 and 2 inches 25 and 50 mm and measuring ranges of 0 050 and 0 100 inches 1 2 and 2 5 mm the model 3442ra1 was designed for applications where tensile or compressive strength tests on small rock concrete and other small compression samples is desired.

Step 4 determining the live load. The optimum deflection limit on your floor joist is an inch for every 360 inches. Note it gives the allowable deflection based on a fractional span quantity so a larger denominator will yield less deflection.