Probabilistic evaluation of maximum dynamic traffic load effects on cable-supported bridges under actual heavy traffic loads

Abstract

The traffic load has grown significantly in recent years, which might be a threat for the service safety of existing bridges. Thus, it is an urgent task to assess the actual traffic load effects on bridges, considering actual heavy traffic load instead of design traffic load. This study presents a framework for extrapolating maximum dynamic traffic load effects on large bridges using site-specific traffic monitoring data. The framework involves vehicle–bridge interaction analysis and probabilistic modelling of extreme values. The weigh-in-motion measurements of a busy highway in China were collected for stochastic traffic load modelling. Case studies of two long-span cable-supported bridge based on the weigh-in-motion measurements were conducted to demonstrate the effectiveness of the proposed framework. It is demonstrated that Rice’s level-crossing approach can capture both dynamic and probabilistic characteristics of the traffic load effects. The root-mean-square displacement of the cable-stayed bridge follows a C-type distribution, and the one for the suspension bridge follows an M-type distribution, which is associated with the first-order mode shapes of the two types of bridges. The amplification factors for the cable-stayed bridge and the suspension bridge are 5.9% and 3.6%, respectively. The numerical analysis indicates that the dynamic effect for extrapolation is weaker with the increase in bridge span length, but the effect of traffic volume growth will be more significant.

Research on the longitudinal movement and influence of restraint parameters of the long-span suspension bridge’s main girder

“…The vehicle load under bridge operation is complicated and random (Liu et al, 2021), in order to reflect the vehicle load on the bridge, the random traffic flow is perceived as the traffic load in the finite element model analysis to ensure that the vehicle load can include the probable various most adverse load combination so that the analysis results are more suitable for bridge operation.…”

Çelik Doğal Gaz Boru Hatlarının Güvenli Gömme Derinliği

“…Deprem etkilerine karşı gömülü boru hatlarının davranışı hususu literatürde araştırılmaya devam edilen bir konu olup dolgu zeminin kendi ağırlığının etkisi yanı sıra boru hatları üzerindeki etkisi son derece ehemmiyet arz eden zemin hareket miktarının tahmini de ayrı bir çalışma alanı olarak değerlendirilmektedir [2][3][4]. [11] Trafik yüklerinin dinamik etkileri köprü gibi sanat yapıları için önem arz etmekte olup doğalgaz üst yapı tesislerinde de çarpma etkisi anlamında dikkate alınması gereken bir durum olarak değerlendirilmektedir [5][6][7].…”

“…Trafik yüklerinin dinamik etkileri köprü gibi sanat yapıları için önem arz etmekte olup doğalgaz üst yapı tesislerinde de çarpma etkisi anlamında dikkate alınması gereken bir durum olarak değerlendirilmektedir [5][6][7].…”

Study and Analysis on Stress Safety Judgment Method of Heavy Vehicle Rolling on Long-Distance Pipeline

“…Once an accident occurs in a gas pipeline, it will not only cause direct losses to the pipeline itself and reduce the economic benefits of the pipeline companies but also cause a huge security threat to the residents and factories around the pipeline and bring serious property losses to the society. Based on this, the test on the influence law of heavy vehicle rolling on the actual pipeline safety in service is carried out, and the monitoring data are analyzed, forming the influence law of heavy vehicle rolling on the pipeline [5][6][7][8].…”