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Hi everyone, Has anybody run structural analysis of the precast multi-cell concrete tanks. The way this tanks constructs is pouring cast in place base slab usually 12" thick with grooves 4" deep at the location of exterior walls and interior wall dividing the cells and the groove is about 7"...

Hi Everyone Does anyone have a suggestion of a study guide or a source of Sample exams or previous solved civil service exams for Associate Civil Engineer Exam. Iam taking the Exam in Suffolk County - NEW YORK STATE. The exam is going to be in the following areas: 1.Principles and practices...

Hi everyone, I would appreciate if anybody has experience with design of overhead pipe steel frame support and supports base foundation can guide me. I need to get to any website that offer design aid or has design examples. I working on a project that has 24" line of fiberglass duct that...

Hi everyone, I am reviewing a concrete mix for tanks walls and the contractor proposing to pour grout mix at the bottom of the tank walls to avoid separation and honeycomb at the bottom of the walls. The grout mix consists of Portland cement, sand, water and admixture (Glenium 3030). I would...

Hi The building is 28' x 64' x 13' high. There are about 4 louvers 2'x2' located all the way at the top of the wall and thier lintels are at the same level as the bond beam. the wall is 12" CMU. Thanks

The building is under construction but the bond beam and the steel lintel have not been constructed yet.

Hi The wall is CMU single wythe and the steel lintel at the same elevation of the bond bbeam at top of the CMU wall. Thanks

Hi everyone, During the construction of a one story building a conflict on the architectical plans has been discovered between the doors and louvers lintel elevation and bond beam elevation. The contractor wants to stop the bond beam where it meets the lintels and add a small bond beam above...

Hi everyone, Is there any limit by code specifing the maximum number of courses per day for a concrete block wall supporting a roof slab for one story building (10 feet high)? Is block settling should be an issue to compress the mortar between the courses if the whole height built on one day...

Hi everyone, I am reviewing design calculation for a precast concrete building (10'x20'x9') to be used as a control building. The roof slab, wall and floor slab are pre-cast concrete connected with steel brackets at 6 locations on top and bottom of the wall. What are the loading cases should be...

Hi I attached another photo to show the worst location where the supporting plate is severely corroded. Few locations are like that but the rest are similar to the photo attached to the original thread on June 9th. Thanks...

Is covering the supporting angles after sandblasting the rusted areas with non-shrink grout consider a good option to protect the bottom of the cradles from the water accumulation at the bottom slab. The grout surface can be pitched to prevent water accumulation on the surface. Thanks

Hi everyone I am working on a project of Two outdoor round oil tanks restoration. The tanks are supported by steel cradels anchored to concrete pad. The steel cardels are showing damage(rust)due to the location of the tanks ( 20 ft from the shore). I am looking of the best way to restore the...

What is the recommended concrete cover for wastewater concrete tanks permanently in contact with corrosive soil? Is there any reference of minimum 3" cover for concrete cover on earth side? How about if ground water level is high? Thanks

Gary, This is my first time designing an odor control system to replace an old odor control system in a weaste treatment plant; I’m hoping you can educate me. The ductwork on the original odor control system ran below the ground, and was constantly filled with water and therefore did not work...

Hi everyone, I am reviewing a large collection system plan that includes sections crossing parkways and sewer jacking to be used under the main highways. The plans call for 18" SDR 35 PVC pipe as a carrier and 28" steel casing. Is the SDR pipe acceptable as a carrier or should DR 18 or...

Hi everyone, Is anybody familiar with PVCO pipe and the main differences between C909 and C900. Is there any Deflection issue using C909 since it has less wall thickness than C900. Is there any website to get more information? I was looking for any evaluation study for C909 VS C900. Thank You

Hi everyone, I am working on design of 45'x 45' wastewater tank cover and our O&M department is interested in Aluminum flat cover (Aluminum deck supported with Aluminum built up hollow rectangular beeams). Is there any standard tables for aluminum hollow sections or any other design aid...

The wall originally designed to support the full unbalanced load but the seven holes have been cored later to use both tanks at the same time without shut-off mechanism. Thanks

Hi every body, I am reviewing a design of reinforced concrete section to close seven circular opens ( one foot diameter each and one foot apart (edge to edge) . the seven opens are located at the corner of dividing wall between a 22'x 60'tank and 18' x 60'tank with 15' hieght and the seven open...