Design of Multi-Column Intersection Steel Joint for the China Resources Headquarter Tower

Yongjun Huang
Director/Vice GM/Chief Engineer 1RS-PRC/Professorate Senior Engineer
Shenzhen Aube Architectural Engineering Design, Shenzhen

The China Resources Headquarter Tower with building height of 400m is located in the Shenzhen Bay of Shenzhen City, Guangdong province, as an important component of the super headquarters base of Shenzhen Qianhai. It looks like a bamboo shoots in spring distinctively to imply brilliant future, and is the tallest building in the block.

It has a tube-in-tube structural system, and the perimeter steel tube consists of inclining columns and beams. So, many complex multi-column crossing joints are coming to fit the building shape, and a waist (minimum cross section) with three-dimensional stress state is formed. Plates in the joint zone are dislocated obviously as each column is distributed in different planes, and the docking is difficult to form the waist shape.

The process of design and verification of the bottom multi-column crossing joint is introduced, starting with the path of force transmission in this presentation. Connection scheme of joint slabs (plates of columns and beams in the joint zone), slab thickness optimization and detail construction are also recommended. Usually, the joint will be simplified so that machining and setting up can be more easily. However, this simplified process (flatting joint panel) may produce additional force to the joint. Flatting the joints panel might bring a secondary stress up to 40% of the initial stress, as extra moment exists. Its influence cannot be ignored. The verification test results show that the finite element analysis results are coincident with that of the test, and the joint designed reasonably will be elastic under the design load.

From the above, comprehensive analysis of the force transfer path and the constructional details is conducted to ensure the structure safety.