Hi all,
A client has a home on the banks of a river in Washington State. During flood conditions the bank undergoes scouring. The bottom of the scoured area is 3 feet above the current water lever and goes up another 2 feet with a horizontal dimension of 18 to 20 inches. The supports for the...
I have a three span beam with two-three foot overhangs. I treated the ends with the overhangs as pinned and did one moment distribution using modified stiffness (0.75*stiffenss) at the pinned ends and one without modified stiffness. They both converge to within two decimal places (using Excel)...
Hi all,
This is not a question it is a solution to a problem I have had for quite some time. I hope it helps. When importing AutoCad drawings into Mathcad The lineweight would either be so fine it would not reproduce well or it would be so heavy that things became unreadable.
I...
I am looking for advice or references to determine the number and depth of soil nails on a slope of 45 to 55 degrees. The soil is fine grained sand with just enough silt to cause it to form lumps that can be broken by hand when dug.
Thanks,
DPA
I am looking for information to help determine the quantity, spacing and depth of soil nails. The site is a steep slope about 45 to 55 degrees and about 150 feet high. Soil is fine sand with just enough silt to form solid but easily broken lumps when dug with a shovel. Lab tests will be...
Occasionally I get a call to do some structural analysis of a mobile home or double wide. Usually it is in an area that is totally inappropriate for the structure such as snow load or earthquake that far exceeds the capacity of the structure. The latest is a request for drawings and calcs to...
I have a situation where I need to add anchors to an existing stem wall. I can't drill in and epoxy threaded rod without cutting through existing horizontal rebar. What I think I need to do is chip out some of the existing stem wall all the way to the footing while leaving the existing rebar...
I have a beam situation that doesn't match anything in my handbooks. The equations for the bending and shear change at x=a. Setting up
M(x) = xxxx if x<a
M(x) = yyyy if x>a
works for both bending and shear. But when I try to find deflection by doing an integral of M(x)*m(x)dx/EI where...
I am searching for the mathematical relationship between candlepower, footcandles etc to lumens. I am trying to compare the intensity of different lighting fixtures in a catalog some are listed one way some the other.
Thanks,
DPA
I have a situation where a 7x7 PSL column is sitting on top of a 15 inch log wall and at the top it supports a very large (19" dia) ridge beam. The owners are very earthquake conscious and want some kind of mechanical connectors, the builder says the end gable framing should be sufficient to...
Hope this is not too far off the topic. I have a Confederate sword that typifies why the South lost the Civil War. Basically it is a poor hand made example done by a blacksmith who was not a sword maker. Cracks in the blade have been repaired with what the previous owner referred to as...
I am working on a stormwater design for a small businss. The county is requiring that in addition to collecting and infiltrating all the stormwater that results from property improvements the owner also has to provide catch basins and collect all of the runoff from the adjacent county road. An...
Does anyone know of any data or even SWAGs for the amount of runoff you get when it rains on snow? For example,
Does the rain melt the snow and double or triple the amount of runoff in the same time of concentration?
Or does the rain melt the snow but the time of concentration increase...
I have a paper which discusses the rational method and the calculations for sizing trench or perforated pipe infiltration systems. In the paper the hydraulic gradient is defined as the (average hydraulic head + distance to the water table)/distance to the water table. I am confused about what...
I have isopluvial maps of my state but what I really need is to determine intensity for various time periods. Is there a way to use the isopluvial value for a given spot and adapt it to a synthetic storm curve Type II in this case?
Does anyone have the numbers used to assemble the SCS storm...
I have a project where the native soil is very porous sand and gravel. The county officials have raised the question of whether it will be necessary to place engineered soils to prevent wastewater and stormwater runoff from reaching the ground water too quickly.
I have heard the term before...
I have a problem posed by the local county officials. They are concerned that the soils on a site that is being developed for recycling are too porous and that rain water may pass too quickly into the groundwater for any treatment of contaminants to occur.
1. What is the best way to figure...
I have a problem posed by the local county officials. They are concerned that the soils on a site that is being developed for recycling are too porous and that rain water may pass too quickly into the groundwater for any treatment of contaminants to occur.
1. What is the best way to figure...
I would appreciate any comments on the use of engineered wood and moment resisting plate connections for building moment frames. Sizing bolt holes is a particular concern. It seems if you make the bolt holes too tight there is bound to be splitting due to shrinkage but if the bolt holes are...
I have a house plan in which the front and back walls of the main part of the house are almost entirely accordian shaped. That is the walls zigzag and are mostly 45 degrees to the centerline of the house. Is it reasonable to calculate their shear resistance as sin(45 degrees) times the shear...
