Risk Assessment of Building Damage Potential Adjacent to a Braced Excavation

Abstract eng:
This paper presents a method for the risk assessment of building damage potential adjacent to an excavation. Herein, the random finite element method (RFEM), which is combined random fields of soil properties with the finite element method through Monte Carlo simulation, is used to estimate the maximum wall deflection. The maximum settlement and settlement profile caused by excavation are estimated by a simplified model. The angular distortion of buildings, which is adopted as the damage criteria in this paper, can thus be obtained provided the settlement profile is available. Finally, the analysis method is then presented and demonstrated with a case history. Figure 1 displays the probability of exceedance of angular distortion at final excavation stage. This chart is useful to evaluate the probability of excedance of angular distortion of a building. For example, if the allowable building angular distortion is equal to 1/500, which is a safe limit for buildings where cracking is not permissible (Bjerrum, 1963), the probability of exceedance are equal to 0.1% and 48.6% at Bay 1 and the other Bays, respectively. The result of case history study reveals the analysis method enables a probabilistic assessment of the excavation-induced building damage potential.

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