Abstract
This study was performed to evaluate the probabilistic characteristics of the flexural strength of reinforced concrete (RC) flexural members adopted for underground box culverts. These probabilistic models were developed to be adopted for the development of limit state load combination formats for underground RC box culverts. The probabilistic models of uncertainties inherent in the basic design variables were developed to evaluate flexural strength using field material test data as well as field survey data collected from various domestic construction sites of underground box culverts in Korea. The basic design variables include concrete strength, steel rebar strength, and section dimensions, such as slab thickness and rebar locations. Some design variables are assumed to have inherent construction error characteristics, which may be different from those inherent in the RC members for buildings and bridges. The bias models on flexural strength were evaluated based on the experimental results of four-point flexural tests on one-way RC slabs, which were fabricated following the general practice adopted in the local underground box culvert construction process. Based on the probabilistic models of basic design variables, as well as the bias models of flexural strength, Monte Carlo simulations were performed to examine the probabilistic characteristics of both ultimate flexural strength and yield moment strength of RC slab members. Some sensitivity analyses were performed to confirm the soundness of various probability models and the assumptions adopted in the development procedure. The proposed procedure may be applied to develop probabilistic resistance models for structural members, in which the construction error characteristics are assumed to be different from other practices.
Highlights
The utilization of underground space has become quite important in urban areas due to the increasing demand for city infrastructure
Underground reinforced concrete (RC) box culverts are widely adopted for utility tunnels for electricity power lines, water pipes, and communications lines
To develop probabilistic models of flexural strengths for slab members adopted in underground RC box culverts in Korea, probabilistic models of basic design variables were established based on material testing data of concrete and reinforcements, and field measurement data on the sectional properties, which were collected from the construction sites for underground RC box culverts in Korea
Summary
The utilization of underground space has become quite important in urban areas due to the increasing demand for city infrastructure. Underground RC box culverts are widely adopted for utility tunnels for electricity power lines, water pipes, and communications lines. Most underground box culverts are constructed along existing urban highways. Most studies [4,5,6,7] adopted probabilistic models of geometric dimensions, as well as the experimental strength bias values in relation to flexural strength, from Ellingwood’s [1] models, in which geometric dimension errors measuredfoundation based on building and The the cover flexural strength not large due to thewere strengthened under themembers bottom slab
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