Distributed mass effects on building pounding analysis
This paper challenges the view that building pounding can be adequately modelled with rigid diaphragms at each floor. Two existing low rise RC frame buildings located in Wellington, New Zealand are subjected to an abridged El Centro record. Non linear time history simulations are undertaken with both lumped mass (rigid diaphragm) and distributed mass (flexible diaphragm) assumptions. Multiple building configurations are modelled to allow floor-to-floor and floor-to-column contact to occur at different points on the two structures. Building displacements are found to be sensitive to diaphragm flexibility only in specific circumstances. However, significant sensitivity is shown in the shears of columns that come in contact with adjacent floors, with shear results differing by up to 18 %. The consequences of pounding on the two low rise structures are also presented, and show critical element failures as a result of floor-to-column pounding.