The Effect of Lateral Load Pattern on Optimum Location of Outrigger and Belt Truss in Tall Buildings

In this paper, the effect of rectangular, triangular and trapezoidal lateral loadings pattern on the optimum location of outrigger and belt truss based on energy concept have been investigated. The effect of outrigger-belt truss on shear core system response is modeled by a rotational spring at the outrigger-belt truss location. Optimum location of this spring is obtained when energy absorbed by the spring is maximized. Optimum location of outrigger and belt truss under the effect of three types of lateral loadings pattern for structure with one, two, three and four outriggers and belt trusses is calculated. Results obtained from the proposed method for 60 story tall building are compared to those obtained using a standard finite element computer package. The approximate analyses are found to yield reasonable results and give a fairly good indication of actual structure’s response.