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한범성 ( Han Bum-sung ),이상달 ( Lee Sang-dal ),이상순 ( Lee Sang-soon ),우정원 ( Woo Jeong-won ),서상길 ( Seo Sang-gul ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
Reinforced concrete members are shortened or elongated due to creep, drying shrinkage, temperature and so on. In many cases, bridge superstructures are free to shortening and elongation without constraint and stresses will not be induced by creep, drying shrinkage and temperature. But if bridge superstructure are constraint due to wrong setting and functional defects of bridge bearing, very large constraint forces can be induced. In this paper, some defects due to constraint are presented and the effects of restraint forces on shear and flexural load carrying capacity are investigated.
내부침 투수가 철근콘크리트 바닥판의 내구성과 안전성에 미치는 영향
한범성 ( Han Bum-sung ),이상달 ( Lee Sang-dal ),이상순 ( Lee Sang-soon ),신재인 ( Shin Jae-in ),서상길 ( Seo Sang-gul ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
Reinforced concrete deck slabs are directly affected by traffic loads and they are also susceptible to weather-related problems, such as cracking, reinforcement corrosion, spalling, scaling, delamination, leakage, efflorescence and so on. Some of these defects are caused by water which seeps through pavements and trapped between pavements and deck slabs. For durability of reinforced concrete deck slabs and pavements, it is very important to protect deck slabs and drain the trapped water out. In order to investigate the effects of the trapped water on the durability and safety of RC deck slab, deck slab and pavement conditions of six bridges are inspected and some tests are performed to determine chloride content, reinforced potential, concrete deterioration and concrete cover thickness of RC deck slab. The effects of the defects caused by the trapped water on the bending and punching shear strength of RC deck slab are also studied.
신재인 ( Shin Jae-in ),이상순 ( Lee Sang-soon ),한범성 ( Han Bum-sung ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
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. This paper presents the development of a method for determining the response modification factor, using traffic load. The proposed method is based on the results of computer simulations of traffic action effects. The simulation program generates random traffic actions for defined traffic conditions and determines the frequency distribution of maximum traffic action effects. A comparison between the proposed method and present method shows good agreement in estimating the modified load carrying capacity of bridges.