In this study the fire test was performed to investigate the mechanic behaviors and failure patterns of precast normal weight concrete (NWC) and lightweight concrete (LWC) walls with three types of commonly used steel connectors, namely dry (61), wet (81), and bearing (56E) connectors. For the LWC wall specimens, on lateral application of tension, the cracking load values of the dry, wet, and bearing-type connectors were 95.1%, 86.3%, and 83.0%, respectively, of the original loads, and their ultimate load values were 81.6%, 90.7%, and 85.0%, respectively, of the original. In the shearing test after the fire resistance test, the cracking load value of the bearing-type connector was 88.2% of the original load. Moreover, all specimens exhibited a considerable loss in the ductility ratio after the fire resistance test. However, the hysteresis energy that can be absorbed and the seismic resistance of the LWC wall were superior to those of the NWC wall. Therefore, alt-hough the LWC and NWC walls exhibited similar failure patterns, steel connectors exhibited superior fire resistance for precast LWC walls.
Chi, Jen-Hao; Chi, Maochieh; and Huang, Yue-Lin
"Fire Resistance of Steel Connectors of Precast Lightweight Concrete Walls,"
Journal of Marine Science and Technology: Vol. 29:
4, Article 4.
Available at: https://jmstt.ntou.edu.tw/journal/vol29/iss4/4