Win for coached rowers
The rowers Lex, Casper, Lucas and Bram, again coached by Eef Siemelink this season, won the 2,500 m C4x+ race for boys aged 17 and 18 on the Amstel by more than 12 seconds.
Customer ratings for the Siemelink stand at the Eigen Huis (Ver)Bouwen + Inrichten fair
After the fair, several visitors gave a score for the information they received at the Siemelink stand. The scores ranged from 7 to 9 out of 10. Where the answers to customers’ questions had not initially been entirely clear, the score was 7.
Read moreTrade fair participation
On 21, 22 and 23 March, Firma Siemelink will be at the Jaarbeurs in Utrecht (Netherlands) at the EIGEN HUIS (VER)BOUWEN + INRICHTEN home renovation fair, stand 10.C20 in hall 10. We are happy to help visitors with structural questions. If you have them, it is best to bring your (possibly old) […]
Read moreProjects for a haulage company
First project Siemelink was asked to check whether a 68-tonne load could be moved on eight crossed timber cribs (supports made of azobé hardwood). His calculation showed that the move could even be done with six cribs. He of course took into account the reduced compressive strength perpendicular to the grain and the […]
Read moreBuilding an aviary
A request came from Switzerland to build an extra-large aviary. Extrapolating from other aviaries seemed irresponsible, so a structural calculation was requested, along with the question of whether, within limited dimensions, anything general could be said in parametric form about the required member sizes for aviaries […]
Read moreFire station conversion
Conversion of a fire station into a house on Stieltjeslaan in Utrecht In the south-west wall on the garden side, the client wanted as many openings as possible into an extension. We chose two adjacent openings of about 4.5 m, framed by two portal frames with downstand beams. A soil investigation showed that the ground had poor bearing capacity […]
Read moreNon-destructive measurement of insulation value
If you measure the difference between the indoor air temperature and the inside surface temperature, and also measure the outdoor temperature, the insulation value of the construction can be calculated. Siemelink did this with a suitable thermometer, so the client learned the existing insulation value without […]
Read moreMunicipal checks
In a municipality in South Holland, I was assisting a client who had to obtain municipal approval again to install a staircase. I found that the previously approved reinforcement was inadequate. See the calculation below. Floor span l = 5.15 + 0.125 + 0.09 = 5.365 m Design load per m² pd = 1.2 × 0.22 […]
Read moreDynamic calculations
For a client, I calculated the natural frequency of a planned chimney and compared it with the wind excitation frequency. This led to a revised design in which the chimney’s natural frequency lies well above the wind frequency.
Read moreHealthy insights inspired by engineering
My dream is that fewer people suffer from psychosomatic complaints. In my view, engineers do not have these complaints as often. I think I know why: technical insight can also help put things into perspective in other areas. I am thinking of the following: When my weight presses on a floor, the floor pushes back with the same force. […]
Read more