Hi Jordan,

**Newmark’s influence chart** is used to determine the vertical pressure underside of uniformly loaded flexible areas for any shape of soil.

**This method is derived from the Boussinesq’s equation for point load by integration.**

**Construction and applications:**

Newmark’s influence chart is constructed by constructing a concentric circle. When the circles are equally by drawing radially lines, which are equally spaced. The radius of the circle is R/z values.

- z is the depth below to uniformly loaded area where increasing stress is obtained
- Today call length of chart B, plot the top view our plan for the loaded area of the corresponding scale.
- Newmark’s influence chart place over the point where the stress is determined by locating the center of the chart.
- Count the number of elements and the portion of the chat enclosed by the plan of the loaded area.

Hope you get the answer.