Load Bearing Capacity Testing of Dowel Pin Anchorage in Granite Cladding
Junru Tan1, Baofeng Huang2, Wensheng Lu3, Khalid M. Mosalam4
1 Tongji University
No. 1239 Siping Road, Shanghai, China
tan_junru@163.com
2 Nanjing Tech University
No. 30 South Puzhu Road, Nanjing, China
baofeng@njtech.edu.cn
3 Tongji University
No. 1239 Siping Road, Shanghai, China
wally@tongji.edu.cn
4 University of California
Berkeley, United States.
mosalam@berkeley.edu
Abstract. The dowel pin anchorage of granite cladding is important for the seismic performance of this type of cladding in high-rise buildings located in seismic regions. It is an essential part in the earthquake initiated inertia force transfer path. Limited analytical and experimental studies were found in literature for this type of anchorage. Current code provisions are usually not adequate when this anchorage is applied in earthquake-prone areas. Therefore, experimental research is necessary to understand the seismic performance especially the failure mode of the anchorage. To investigate the load bearing capacity of such anchorage, monotonic tests were performed. Results show that the ideal failure mode of the dowel pin cladding system is the plastic shear or the shear and bending deformation of the steel pin prior to the rupture of the dowel. This mode has very clear signs before failure. Thus, corrective measures can be timely taken once it is observed. It was also found that the maximum load bearing capacity of 5 mm pin with sleeve is 30% higher than that without sleeve, while the 8 mm pin system with sleeve is only 6% higher than that without sleeve, which means that existence of the sleeve contributes to the load bearing capacity to some extent. Cladding with 5 mm steel pin has two failure stages, namely, pin yielding and panel rupture, which allow steel pins to deform plastically and dissipate energy before total failure of the anchorage. While cladding with 8 mm pin has only one failure stage, namely sudden rupture of the panel without any prior warning signs. Thus, 8 mm pins are suggested not to be used in practical structural engineering designs of granite cladding. The rupture surface of the panel has the angle of 24° to 29° on the side surface, and 27° to 33° on the top surface. More comprehensive experimental and analytical studies are needed to develop a reliable calculation method of the failure load.
Keywords: Dowel pin anchorage; Failure modes; Granite cladding; Load bearing capacity; Static tests.
