Leaderboard

Providing 12" PCC cannot controll the settelments because on the application of load this PCC layer will be crushed and will change in to a powder form.

You can use the shorter direction of two way slab and plug it in the beam deflection formula. That would be a conservative approach. Thanks.

Your understanding is correct. Settlement of Raft has to do with every layer beneath raft to a certain depth and their response to consolidation. Good thinking- change your geotech consultant. Thanks.

A progressive collapse is a catastrophic partial or total structural failure that ensues from an event that causes local structural damage that cannot be absorbed by the inherent continuity and ductility of the structural system. If i understood your question correctly then your above statement states that progressive collapse happens due to 1. lack of redundant elements "A redundant or indeterminate structure has more structure than is absolutely necessary. " 2. lack of continuation Simply supported beam vs 3 span beam. Which one has better moment redistribution? 3. lack of ductility Shear wall system vs moment frame. Which one has better ductility.

IMO, it is not an error, rather it is a warning message indicating that UBC wind analysis results might not be reliable, if the building being analyzed is more than 400 feet high. This is in accordance with requirements of UBC-97 section 1615, which requires that approved national standards (e.g., ASCE 7 etc), shall be used for wind design of buildings over 400 feet in height, among others. Moreover,AFAIK, you may still run your model (even after display of this warning message), by pressing OK button again and again (although analysis results might not be acceptable). Regards.

Basic Building Parameters The basic parameters that define a pre-engineered building are: Building Width, Building Length, Building Height, Roof Slope, End Bay Length, Interior Bay Length, and Design Loads. BUILDING WIDTH: No matter what primary framing system is used, the building width is defined as the distance from outside of eave strut of one sidewall to outside of eave strut of the opposite sidewall. Building width does not include the width of Lean-To buildings or roof extensions. BUILDING LENGTH The longitudinal length of the building measured from out to out of end wall steel lines. BUILDING HEIGHT: Building height is the eave height which usually is the distance from the bottom of the main frame column base plate to the top outer point of the eave strut. When columns are recessed or elevated from finished floor, eave height is the distance from finished floor level to top of eave strut. ROOF SLOPE: This is the angle of the roof with respect to the horizontal. The most common roof slopes are 0.5/10 and 1/10. Any practical roof slope is possible. END BAY LENGTH: The distance from outside of the outer flange of endwall columns to center line of the first interior frame column. INTERIOR BAY LENGTH: The distance between the center lines of two adjacent interior main frame columns. The most common bay lengths are 6 m, 7.5 m and 9 m. DESIGN LOADS: Unless otherwise specified Steel pre-engineered buildings are designed for the following minimum loads: Roof Live Load: 0.57 kN/m2 Design Wind Speed: 110 km/h Design for snow loads, earth quake loads, collateral loads, crane loads or any other loading condition, if required must be specified. Source: zamilsteel.com