Hi, First of all, the basement curtains and raft base defined in the first model you added are not defined in the second model. (For this reason, the bottom edge of the ladder remains free and the deformation is incorrect.) Additional suggestions; - "Apply TS 500 redistribution clause" option can be checked in Analysis Settings dialog/Load Security Tab. -To increase the "bj" width in the Join Interrupt Security control; If the architectural design allows, the misalignment of the K02-K03 beams is 5 cm. The misalignment of the K09-K10 beams is 45 cm. It can be edited as defined.