Urbach Tower: Integrative structural design of a lightweight structure made of self-shaped curved cross-laminated timber. Structures, (33):3667--3681, ELSEVIER SCI LTD, October 2021. [PUMA: surface-active knippers engineering shell 2021 digital structure itke from:petraheim fabrication menges cross-laminated curved folded Timber aldinger crossing-screw CLT lightweight integrative self-shaping design connection urbach wood computational architecture bechert tower]