• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.12
• /
• pp.845-856
• /
• 2020

This study proposes a bridge evaluation system for indivisible permit vehicles such as hydraulic cranes. The permit loads for the bridge evaluation are divided into three categories: routine permit loads, special permit 1 loads, and special permit 2 loads. Routine permit and special permit 1 vehicles are allowed to cross a bridge with normal traffic. For these two permits, the standard lane model in the Korean Highway Bridge Design Code was adopted to consider normal traffic in the same lane. Special permit 2 vehicles are assumed to cross a bridge without other traffic. Structural analyses of two prestressed-beam bridges and two steel box girder bridges were conducted for the proposed permit loads. The rating factors of the four bridges for all permit loads were calculated as sufficiently large values for the moment and shear force so that crossing the bridges can be permitted. A reliability assessment of the bridges was performed to identify the reliability levels for the permit vehicles. It was confirmed that the reliability level of the minimum required strength obtained by the load-resistance factors yields the target reliability index of the design code for the permit vehicles.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.4 no.4
• /
• pp.211-218
• /
• 2000

Many bridges are severely damaged by the overloaded heavy vehicle and the trend will become more serious because the traffic volume is continuously increasing. Currently, the vehicles with gross weights over 40 tonf or axle weight over 10 tonf are not allowed on the public road. However, this regulation is not based on a systematic study on the bridge capacity and assumed to be much too conservative depending on the vehicle types and bridge types. In this study, the permit weights of heavy vehicles of diverse axle spacings and axle load distribution are calculated considering the structural characteristics of bridge superstructures. In order to consider the various load effects of heavy weight vehicle crossings, three conditions are considered in the calculation of permit vehicle load. From the results, the permit vehicle weights of the simple girder bridges are calculated.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2000.04b
• /
• pp.222-229
• /
• 2000

Malty bridges are severely damaged by the overloaded heavy vehicle and tile trend will become more serious because the traffic volume is continuously increasing. Currently, the vehicles with gross weights over 40 tons or axle weight over 10 tons are not allowed on the public road. However, this regulation is not based on a systemetic study on the bridge capacityand assumed to be much too conservative depending on the vehicle types ans bridge types. In this study, the permit weights of heavy vehicles of diverse axle spacings and axle load distribution are calculated considering the structural characteristics of bridge superstructures. In order to consider the various load effects of heavy weight vehicle crossings, three conditions are considered in the calculation of permit vehicle load. From the results, the permit vehicle weights of bridges are calculated and simplified formulas which can be used in the case when only the vehicle dimension are known are presented.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2007.12a
• /
• pp.283-286
• /
• 2007

최근 우리나라 여러 주요 항만에 해상교량의 건설이 진행 중이거나 계획 중에 있는데, 이들 교량의 설치 위치나 규모가 주로 경제적인 측면만을 강조하여 이루어짐으로써, 선박 동항안전에 위협을 주고 있으며, 이해 당사자 간의 갈등이 고조되고 있는 현실이다. 따라서 이 연구에서는 선박 통항로 상에 많은 해상교량을 가지고 있는 미국의 해상교량 관련 법령과 절차를 조사${\cdot}$연구하여 우리나라의 제도를 제안하는데 참조하고자 한다.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.5 no.1
• /
• pp.169-175
• /
• 2001

Bridge load rating calculations provide a basis for determining the safe load capacity of bridge. Load rating requires engineering judgement in determining a rating value that is applicable to maintaining the safe use of the bridge and arriving at posting and permit decisions. Load testing is an effective means in calculating the rating value of bridge. In Korea, load carrying capacity of bridge is modified by response modification factor that is determined from comparisons of measured values and analysis results. The response modification factor may be corrupted by vehicle location error that is defined as the gap of test vehicle location between load testing and analysis. In this study, the effects of vehicle location error to structural response and response modification factor are investigated, and a new method for evaluating response modification factor is proposed. The random data analysis shows that the proposed method is less sensitive to vehicle location error than the present method.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2000.10b
• /
• pp.1273-1278
• /
• 2000

Bridge load rating calculations provide a basis for determining the safe load capacity of bridge. Load rating requires engineering judgement in determining a rating value that is applicable to maintaining the safe use of the bridge and arriving at posting and permit decisions. Load testing is an effective means in calculating the rating value of bridge. In Korea, load carrying capacity of bridge is modified by stress modification factor that is determined from comparisons of measured values and analysis results The stress modification factor may be corrupted by vehicle location error that is defined as the gap of test vehicle location between load testing and analysis. In this study, the effects of vehicle location error to structural response and stress modification factor are investigated, and a new method for evaluating stress modification factor is proposed. The random data analysis shows that the proposed method is less sensitive to vehicle location error than the present method.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2007.12a
• /
• pp.287-289
• /
• 2007

최근 우리나라 여러 주요 항만에 해상교량의 건설이 진행 중이거나 계획 중에 있는데, 이들 교량의 설치 위치나 규모가 주로 경제적인 측면만을 강조하여 이루어짐으로써, 선박 통항안전에 위협을 주고 있으며, 이해 당사자 간의 갈등이 고조되고 있는 현실이다. 이에 본 연구에서는 국내 해상교량 관련 법령과 절차에 대한 조사 및 연구를 통하여 현행 제도에 대한 문제점을 파악해 보고자 한다.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2006.05a
• /
• pp.350-353
• /
• 2006

We enhance the stability of SaeManGeum Drainage Sluice Gate Bridge. We prevent a destruction disaster of it. We extend the life cycle of it. So We have developed the safety control system to manage the facility of bridge to the continuance. In this study, sensitive sensor and measuring instrument has been taken to consider the characteristic of the box-girder type concrete bridge. And CDMA type has adapted for wireless communication. Control program has been developed on web base. In this program, the advanced systems have applied like this; the setup of control range for management from the statistical analysis, the evaluation system for force and deformation and the control system for a heavy vehicle permit.

• Structural Engineering and Mechanics
• /
• v.29 no.2
• /
• pp.171-186
• /
• 2008

The seismic response analysis of an existing bridge needs a mathematical model that can be calibrated with measured dynamic characteristics. These characteristics are the periods and the associated mode shapes of vibration and the modal damping coefficients. This paper deals with the measurements and the interpretation of the results of ambient vibration tests done on a newly erected cable stayed bridge across the Oued Dib River at Mila city in Algeria. The signal analysis of ambient vibration records will permit to determine the dynamic characteristics of the bridge. On the other hand, a 3-D model of the bridge is developed in order to assess the frequencies and the associated modes of vibration. This information will be necessary in the planning of the test on the site (locations of the sensors, frequencies to be measured and the associated mode shapes of vibration). The frequencies predicted by the finite element model are compared with those measured during full-scale ambient vibration measurements of the bridge. In the same way, the modal damping coefficients obtained by the random decrement method are compared to those of similar bridges.

• Structural Engineering and Mechanics
• /
• v.30 no.5
• /
• pp.559-576
• /
• 2008

Having established the initial geometry and cable force of a typical three span suspension bridge under permanent load, the additional maximum response of the cable and the stiffening girder due to live load are determined, by means of an analytic procedure, considering the girder first hinged at its ends and then continuous through the main towers. The problem of interaction between the cable and the stiffening girder is examined taking under due consideration the second order effects, whereby, through the analogy to a fictitious tensioned beam under transverse load, a closed -form solution is achieved by means of a simple quadratic equation. It is found that the behavior of the whole system is governed by five simple dimensionless parameters which enable a quick determination of all the relevant design magnitudes of the bridge. Moreover, by introducing these parameters, a set of diagrams is presented, which enable the estimation of the influence of the geometric and loading data on the response and permit its immediate evaluation for preliminary design purposes.