The complex flow structure around bridge piers is challenging for both experimental and numerical studies. Therefore, investigating the capabilities of Computational Fluid Dynamics (CFD) tools in resolving mechanism sediment entrainment into out scour hole remains a task. In this study, depth an oblong pier bed shear stress distributions time space were numerically investigated using tool Sedim...

The purpose of this work was to validate and apply a commercial computational fluid dynamics code with a hybrid RANS/LES turbulence computational model for a flow past a bluff body ultimately to help in the design of the caisson anchoring system during construction of a new adjacent span of the Tacoma Narrows Bridge. INTRODUCTION The new Tacoma Narrows Bridge will be designed as a suspension br...

A prototype self-centering prestressedconcrete (SCPC) bridge pier andconventional reinforced concrete (RC) with similar backbone curves are designed and modeled. The objective of this study is to investigate the seismic performance SCPC considering effect vertical earthquake ground motions. Under a severe motion, RC damage much greater than pier. shows great capability in reducing residual drif...

In this paper we describe our initial experiences with deploying and running PIER, a distributed query processor, on 200 nodes of the PlanetLab network testbed. Through use cases, we show that PIER is flexible and can easily incorporate new data sources without a priori knowledge of their schemas. We highlight of number of important features in PIER used in our use cases, including in-network a...

Abstract Employment of protective structures is vital for reducing the effect local scour created surrounding bridge piers. One most effective used controlling and piers collars. Hence, research on mechanism scouring combination pier collar as well reduction great significance. In this study, various width-to-pier width ratios parameters rectangular has been investigated experimentally in 180-d...

The most important causes of bridge failure are local scour. In this study, laboratory experiments were conducted to investigate the effectiveness of slot as a protection device in reduction of depth of scour at cylindrical piers under clear water flow conditions. The development time of scour depth at the circular pier with and without a slot as a protection device was conducted. The experimen...

The use of precast post-tensioned segmental (PPS) piers is growing in the bridge industry, particularly Accelerated Bridge Construction (ABC). To increase their high-seismicity regions, this study focuses on seismic performance PPS under pulse-like near-field earthquakes. Two ensembles 40 ground motions and 44 far-field along with three various heights are used a series incremental dynamic anal...

The migration of a waved-shape accumulation ice particles under an cover (referred to as “ice wave” in this study) is phenomenon transport during process rivers. wave will affect the pier scour. On other hand, local scour at waves. interaction between waves and around very complicated since not only channel bed deforms, but also jam develops simultaneously. By conducting series flume experiment...

This paper deals with the economic optimization of reinforced concrete road vaults and with the optimization of rectangular hollow section bridge piers typically used in road construction. It shows the efficiency of a heuristic optimization by the threshold accepting algorithm. The evaluation of solutions follows the Spanish Code for structural concrete. Design loads are in accordance to the na...