University of California Berkeley Spring Semester 2024 Civil Environmental Engineering Instructor Alan Kren CEE 247 Homework 4 Assigned March 12 2022 Due March 21 2022 Eccentric Load Design The attached detail shows the support for a precast concrete panel The panel imposes a 5 280 pound point load on the floor 1 7 outboard of the supporting girder s centerline Your task is to complete the detail as listed below The connection supports an additional vertical seismic load equal to 0 20xSds For this building Sds 1 10 Show required weld sizes on the detail Plates are ASTM A572 Gr 50 Bolts are ASTM F3125 Grade A325 installed snug tight in standard holes threads included in shear plane Shapes are ASTM A992 group the plate 1 Verify the capacity of the x5 shear tab to transfer the eccentric moment to the resisting bolt a Verify Mn vs Mu of the shear tab b Size the weld between the x5 shear and the W27 web Use a fillet weld one side of 2 Verify the capacity of diameter ASTM F3125 Grade A bolt group to resist the eccentric moment Assume tear out and yielding in the plates works check only the bolts using tables 7 1 and 7 4 a Verify using the elastic method shown in class b Verify using the plastic method shown in class c Verify using the instantaneous center of rotation method by using Table 7 12 there is one bolt per vertical row d Compare the demand to capacity ratios determined by each method 3 Verify the capacity of the x8 x8 plate to transfer the eccentric moment to the W8 bottom flange 4 Size the welds between the x8 x8 plate and the W8 bottom flange Use a fillet weld on the near side and a partial penetration weld on the far side a Why is a partial penetration weld used on the far side of the plate Sketch showing the 8x8 plate sitting against the 5 shear tab 5 Verify the capacity of the W8 to resist the eccentric moment Note that the eccentric moment is constant but that the resisting moment arm varies as you verify the different connection elements The bolts in the W8 are centered on the W8 s longitudinal axis PRECAST PANEL WP B O BENT PL 5 280 LBS 6 0 TO CL ADJACENT BM W27x84 0 3 TYP 0 5 PL3 8x8x8 Q E Q E W8x18 1 7 1 2 2 0 PL3 8x5 WP CL FLANGE 1A S1 01 1 SECTION 1 1 0 1A SECTION 1 1 0 HW 4 PC PANEL Date Drawn By Scale 2024 03 12 AHK 1 1 0 S1 01 M P 0 1 6 0 2 1 4 2 0 2 2 1 3 PRECAST PANEL WP B O BENT PL 5 280 LBS 6 0 TO CL ADJACENT BM W27x84 W8x18 1 SECTION 1 1 0 5 4 3 2 1b 1a 4 WELD 3 PL 3 8 1b WELD 1A PL 3 8 2 BOLT GROUP HW 4 CALC MAP Date Drawn By Scale 2024 03 12 AHK 1 1 0 S1 02 M P 0 1 6 0 2 1 4 2 0 2 2 1 3