Special Reinforced Concrete Shear Wall Design

Two weeks ago i had the chance to present to the young members group of the structural engineering association of metro washington on the topic of multi story light frame shear wall design with all of the large firms in the d c.

Special reinforced concrete shear wall design.

The design and detailing requirements for special reinforced concrete shear walls have undergone significant changes from aci 318 11 to aci 318 14. Reinforced concrete shear wall analysis and design a structural reinforced concrete shear wall in a 5 story building provides lateral and gravity load resistance for the applied load as shown in the figure below. Special reinforced concrete structural walls are walls that have been proportioned and detailed to meet special code requirements for resisting combinations of shear moment and axial force that result as a building sways through multiple displacement cycles during strong earthquake ground shaking. Based on aci 18 10 4 1 nominal shear strength v n of structural walls is not to exceed vn acv c f c t fy where c is a coefficient defining the relative contribution of concrete strength to wall strength given as follows.

A guide for practicing engineers the primary seismic force resisting elements in buildings are horizontal diaphragms vertical framing elements and foundations. A structural reinforced concrete shear wall in a 5 story building provides lateral and gravity load resistance for the applied load as shown in the figure below. A guide for practicing engineers learning objectives participants will 1. Seismic design of special reinforced masonry shear walls.

Specifically is monolithic emulation required for ipsw or is that the difference between the two systems. Be familiar with the special reinforced masonry shear wall design process 2. Reinforced concrete shear wall analysis and design. My understanding is that srcw requires monolithic emulation design but ipsw is primarily for typical large panel jointed precast walls which are coupled together for sharing dead load to resist overturning but no special reinforcement.

What is the difference in detailing for intermediate precast shear walls ipsw vs special reinforced concrete walls srcw made from precast elements. Area it wasn t a big surprise to find out that only about one third of the group had experience with light frame shear wall design. Strength of reinforced concrete sections amount of rebar a s the project calls for 5 10 and 5 12 are used. C 0 80 for hw.

The requirements of this section apply to special reinforced concrete structural walls serving as part of the earthquake force resisting system. Strength reduced from 136 7 to 114 9 in kips. Nist technical brief no. Figure 1 reinforced concrete shear wall geometry and loading.

The changes are a result of the unsatisfactory performance of many shear walls in the chile earthquake of 2010 and the christchurch new zealand earthquake of 2011. Shear wall section and assumed reinforcement is investigated after analysis to verify suitability for the applied loads. Together these elements comprise the seismic force resisting system sfrs. Seismic design of special reinforced masonry shear walls.