Effect of Load Fluctuations on Failure Mechanisms of Road Bridge RC Deck Slabs and Evaluation of Fatigue Resistance

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420464
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Nihon University
• Principal Investigator: ABE Tadashi 日本大学, 生産工学部, 教授 (80060218)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: RC床版 / 荷重変動 / 走行一定荷重 / 走行振動荷重 / 押抜きせん断耐荷力 / 耐疲労性 / S-N曲線

Outline of Final Research Achievements

It is considered that one of the causes of damage to road bridge RC slabs is the effect of load vibrations due to fluctuating loads from heavy-duty vehicles generated near steps at expansion joints. As a result of load vibrations generated by heavy-duty vehicles due to expansion joints or evenness in the road surface, or the difference in levels, shock loading is applied that exceeds the design values.
In this report, fatigue tests under constant traveling loads and tests under fluctuating loads, namely vibrating loads with a sinusoidal wave form, were carried out. From these the fatigue resistance was evaluated relative to the number of load repetitions of an RC slab on which fatigue tests with constant traveling loads only were carried out. Also, consistency of the results with an S-N curve equation for predicting the life of an RC slab proposed by the authors was verified.

Free Research Field

構造工学・地震工学・維持管理工学