A concept development and proposed design procedure for rocking precast hollow core wall in warehouse

Abstract

Precast hollow core unit is commonly used in the construction of flooring system in precast reinforced concrete building in Malaysia. One of the technical challenges is to design and use precast hollow core unit without any transverse reinforcement bars to resist earthquake loading. One of the approachable methods is to combine the basic concept of rocking structure together with Damage Avoidance Design (DAD) philosophy. Moreover, Performance-Based Seismic Engineering Design concept is also incorporated in this study so that reinforced concrete structure can survive under Design Basic Earthquake (DBE) and Maximum Considered Earthquake (MCE). In this study, the total effective viscous damping ξeff plays an important role in designing seismic wall panel which comprises of hysteresis damping (ξeq), radiation damping (ξrock) and intrinsic damping (ξinst). Another attributes which also plays a significant role in plotting capacity-demand spectrum for any location in seismic regions is damping reduction factor (B). By combining the capacity-demand spectrum and concept of rocking structure, a proposed design procedure of warehouse buildings using PHCW is developed and proposed. The proposed design procedure consists of seven steps which are determination of seismic demand, maximum response displacement for MCE and DBE, estimation of total effective damping, calculation of base shear, design of energy dissipator and unbonded tendons, evaluation hysteresis and total damping, and finally, the assessment of seismic capacity of rocking wall. In this study, it is expected that the rocking precast hollow core wall can reduce a substantial amount of structural damage and remain functional after an earthquake.