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For two way slabs there is a great discussion and analysis of this system in the 12th ed of Design of Concrete Structures by Arthur N. Nilson. If you look in chapter 12 on Edge Supported Slabs, you will fill useful tables for 9 separate boundary conditions for negative and positive moments and...

These steel tanks are typically 9-12' in diameter and are supported by 4 or 6 equally spaced vertical steel posts with base plates. I am checking the uplift forces due to seismic full, seismic empty and wind empty. I am also designing the anchorage in accordance with API 650 Section 5.12.13...

Hello: I am designing cast-in-place steel anchor bolts (ASTM F1554 Gr 36) to be used to anchor vertical steel tank support legs to concrete. Due to the relatively low seismicity I frequently calculate that the legs do not go into tension. Seismic shear and wind shear are present of course...

I have a shotcrete wall tilted back 45 degrees toward the heel side. The wall acts as erosion protection. Is there a relatively simple way to calculate the active pressure coefficient without having to use the DEEP Ex program? It seems to me that as the wall is tilted back, the active soil...

Hello All: I have a project that requires part of the external tank shell of a 50' diameter AWWA steel water tank to be partially below grade. The tank shell height is 14 feet and the users want to bury the tank 9 feet max into the ground. Any help on how to design the tank shell below grade...

thread809-137782 I would like further clarification about how PEStructural used both Roark's Table 35 case 19b and AWWA. Did you use AWWA equation 3.33 and set the variable h equal to the variable l in Roark's equation case 19b? I have a similar condition where a 50 diameter tank will be...

We have a client who has shown inlet and outlet wing wall lengths and wall slopes on his drawings which differ from the ADOT (Arizona DOT) standards in relation to concrete box culverts and concrete pipe culverts. I am having difficulty in determining when an analysis should be done when the...

In the design of lifting lugs in accordance with the ASME BTH-1 standard, there are three basic equations listed which define the allowable tension strength though the pin hole, and two more equations for strength beyond the pinhole. One of the variables in equation 3-51 is the letter "a" which...