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| Simulation analysis and experimental study on the damage of bridge structure caused by tilt collapse and rockfall on the slope of Lalin railway#br# |
| WANG Xiang1，2，PAI Lifang2，3，WU Honggang2，4，5#br# |
(1. School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China；2. Northwest Research Institute Co.，Ltd.，of C.R.E.C，Lanzhou，Gansu 730000，China；3. China Academy of Railway Sciences，Beijing 100081，China；4. Western Environmental Rock and Soil Remediation Technology Engineering Laboratory，Lanzhou，Gansu 730000，China；5. China Iron Landslide Engineering Laboratory，Gansu，Lanzhou 730000，China)
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Abstract There are still many problems to be solved due to the complex structure and various factors of rockfall，especially the dynamic response of railway bridge engineering to the impact of rockfall is one of the key problems to be solved. This paper takes a typical bridge engineering site of La-Ling Railway as an example，using Rocfall simulation，focuses on the dynamic analysis of the total kinetic energy of translational velocity，spring height and so on caused by rock mass collapse and rock falling on the same structural plane with different slope inclinations，based on the above analysis，combined with the model test acceleration response test，using SPECTR calculating program of the acceleration，velocity and displacement features of the dynamic response spectrum analysis and evaluation. The results：(1) The rockfall movement is mainly related to the slope dip angle. The slope dip angle is relatively large，the rock falling from the slope is mainly rolling movement；The slope angle is small，and the falling stone mainly slides from the slope. (2) Under the influence of dynamic friction and recovery coefficient，the falling rock of the dangerous rock will have a nonlinear decrease in the process of each impact on the concrete bridge deck. (3) Rock mass rockfall has a large short-term acceleration pulse effect on the impact of structure. When the fundamental frequency of structure is the same，the spatial change of rock fall movement from the slope is the main factor causing the significant difference in response of vibration characteristics. (4) Speed response time history curve approximation shows "cosine" type，the overall even increase over time and present nonlinear changes，increase or decrease its speed and large angle slope angle response peak slightly bigger than the small angle，slope angle rockfall impact time effect of structure on the associated with the slope angle，slope angle，the greater the triggering time effect，the more obvious，the longer duration of vibration effectively. (5) When the damping ratio is between 10% and 20%，the attenuation range of the response spectrum curve is the most significant，and when the value is between 30% and 40%，the acceleration response spectrum curve shows obvious difference. Therefore，the design should encourage the increase of the bridge¢s flexible anti-impact performance. The above research results have engineering guiding significance for the construction of new bridges in mountainous areas of Sichuan—tibet railway.
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2020, Vol. 39 
