A turbine casing assembly , comprising: a turbine support case (TSC) having a TSC body defined about a center axis with a TSC flange ; and an exhaust case having an exhaust case body defined about the center axis with an exhaust case flange extending radially outwardly from the exhaust case body to a radially-outer wall defining an outer diameter (QJ) of the exhaust case flange , the exhaust case flange configured to attach the TSC to the exhaust case , the exhaust case having struts circumferentially spaced apart about the center axis , each of the struts extending radially from an inner end to an outer end attached to the exhaust case body , each of the struts extending between a leading edge portion and a trailing edge portion , at least a portion of the leading edge portion at the outer end of each of the struts being positioned radially inwardly of the exhaust case flange along a radial line (RL) extending from, and perpendicular to, the center axis through the exhaust case flange , wherein: the TSC body adjacent to the TSC flange is resiliently deformable such that it can deform temporarily and return to its original shape in response to a radial displacement of parts of the exhaust case due to thermal expansion; and the TSC flange has a TSC flange radially-outer wall , a radial thickness (FRT) of the TSC flange defined from the TSC body to the TSC flange radially-outer wall , characterized in the TSC flange including reinforced portions each being circumferentially aligned with one of the struts upon the TSC being attached to the exhaust case , the TSC flange including other portions each disposed circumferentially between adjacent reinforced portions of the TSC flange , the radial thickness (FRT1) of the reinforced portions being greater than the radial thickness (FRT2) of the other portions , and the exhaust case flange configured to be secured to the TSC flange to abut the TSC flange against the radially-outer wall of the exhaust case flange . a turbine support case (TSC) having a TSC body defined about a center axis with a TSC flange ; and an exhaust case having an exhaust case body defined about the center axis with an exhaust case flange extending radially outwardly from the exhaust case body to a radially-outer wall defining an outer diameter (QJ) of the exhaust case flange , the exhaust case flange configured to attach the TSC to the exhaust case , the exhaust case having struts circumferentially spaced apart about the center axis , each of the struts extending radially from an inner end to an outer end attached to the exhaust case body , each of the struts extending between a leading edge portion and a trailing edge portion , at least a portion of the leading edge portion at the outer end of each of the struts being positioned radially inwardly of the exhaust case flange along a radial line (RL) extending from, and perpendicular to, the center axis through the exhaust case flange , the TSC body adjacent to the TSC flange is resiliently deformable such that it can deform temporarily and return to its original shape in response to a radial displacement of parts of the exhaust case due to thermal expansion; and the TSC flange has a TSC flange radially-outer wall , a radial thickness (FRT) of the TSC flange defined from the TSC body to the TSC flange radially-outer wall , characterized in the TSC flange including reinforced portions each being circumferentially aligned with one of the struts upon the TSC being attached to the exhaust case , the TSC flange including other portions each disposed circumferentially between adjacent reinforced portions of the TSC flange , the radial thickness (FRT1) of the reinforced portions being greater than the radial thickness (FRT2) of the other portions , and the exhaust case flange configured to be secured to the TSC flange to abut the TSC flange against the radially-outer wall of the exhaust case flange . <EOS>