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1. Are these C25024 secondary purlins part of a proprietary roofing system like LYSAGHT purlins incorporating HOOK-LOK II bridging, or STRATCO purlins with RAPIDFIX bridging etc? Similar, but not the same. Our bridging is similar to that shown in their manual, except we donot use tie-rods 2...

Hi Could you elaborate a bit more what you mean by diaphragm. I am a mech. eng. so am not familiar with all the structural terms. A.

In reply they are C25024 purlins cold formed. But I still cant imagine using horz. bolts. WEudnt that reduce the twist resistance. A

Hi Glass It has 2 bolts I guess it's covered by the flange. Thanx for the tip. Ye the hole dia. is only 2mm over the bolt dia. I wouldn't be able to make the bracket the full height atleast not for the secondary purlin coz its larger than the bridging. Likewise secondary to main. Regards, A.

Sorry now I have Basically the attachment setup between purlins and b/w purlins and the tank wall is the same. I understand what ur saying glass99, but the objective is to prevent lateral torsional buckling by preventing twist and lateral movement. I can see that the compression flange may...

Hi BA, I have attached a sketch. A.

2 bolts /web (i.e 4 per plate) A.

Hi BA, Thanx for the reply. All the literature I've been reading suggests that the compression flange needs to be restrained. Hence, my doubt. Yes 2 bolts are used to the bolt the L Plate to the webs of the secondary and main. One more question- Would the spacing equations for the lateral...

Minor correction to my post above, the bridging are connected between the secondary purlins, not to the tank wall.

Hi guys, We make our roof structure for our circular tanks out of variously sized purlins. We have one end of 2 main purlins attached to a centre bracket and the other ends bolted to the tank wall. Now we have secondary smaller purlins regularly spaced attached to the main and the tank wall...

Hi We are erecting 2 water tanks about 12 metres high in a cyclonic region (wind speed 73m/s). Tanks are about 3 metres apart. We will be having a common platform between them. Should the base frame of the common platform be CHANNELS or I- BEAMS or dosen't make a difference. If I use channels...

Hi Would this be a solution. What if I had a 100mm overlap of the chequered plate over the other platform and left it unbolted at that end and bolted at the other (say 500mm long laying on the first platform bolted down with 4 M12). So basically it would be like a cantilever (bolted at one end...

Hi Guys, Thanx for the prompt replies. I aint a very experienced design engineer. Would anyone have any standard or e.g on how to make a sliding connection. Regards, A.

Hi Guys, We are erecting two tanks about 6450 mm (254 in) high at the top of shell (i.e top rim, not roof height), edge to edge distance about 1.9 m (75 in) b/w the two tanks. So we have 2 independent rest platforms rectangular at the top of shell on the outside of the tank (i.e not on the...

Hi guys, I am modeling an equipment skid (approx. 9 m x 4m) with tanks and a pump that is to be used somewhere in the dessert. It isnt bolted to the ground. It's self weight supported on top of the ground which is sand. My question is that since it does not have any fixed or pinned supports...