Seismic Shear Demand on RC Structural Walls: Review and Bibliography

Abstract eng:
Effect of higher vibration modes on the seismic shear demand of reinforced concrete cantilever walls has been studied since the 1970’s. The shear amplification becomes more important with increasing fundamental period (tall buildings) and increasing ductility demand (R or q factors). Yet, studying the relevant recommendations of structural engineering researchers and provisions of various seismic codes reveals that there is no consensus regarding the extent of shear amplification and of the inter-wall distribution of shear demand in structural systems comprising walls of different lengths. Paper presents the available formulas for predicting shear amplification in ductile walls and dual systems (wall-frames), as well as techniques for estimating the shear distribution among interconnected unequal walls. The consideration, or absence, of these effects by leading seismic code provisions is also noted. One effect that impacts the shear amplification is shear cracking mainly in the plastic hinge zone of the wall near the base resulting in very low effective shear stiffness. Also, deliberately allowing development of plastic hinging along the wall height (contrary to standard code requirements) has been suggested. These appear to lead to appreciably lower shear amplification than previously predicted. Finally, an extensive bibliography (circa 100 refs.) is provided.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket