set the loading
| surfLoadIntensity | VariationAttr or double | surface load intensity |
| areaLoadFactorExpr | optional string | Any function of area that evaluates to a number, note all numbers must be in US English, i.e. "1.2", not the current locale (e.g. Italian/Swedish/French "1,2") |
| Return value | Pointer to this object | Allows multiple function calls to be chained together |
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