鋼筋混凝土墩柱沖擊動(dòng)力響應(yīng)簡(jiǎn)化分析

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中圖分類(lèi)號(hào)：U441 文獻(xiàn)標(biāo)志碼：A

本文引用格式：.鋼筋混凝土墩柱沖擊動(dòng)力響應(yīng)簡(jiǎn)化分析[J].華東交通大學(xué)學(xué)報(bào)，2025，42（3）：22-30.

Simplified Analysis on Impact Dynamic Response ofReinforced Concrete Columns

RenLiang，F(xiàn)angZhou，ZhengShengpei

（SchoolofCivilEngineeringandArchitecture，EastChinaJiaotong UniversityNanchang33oo13，China）

Abstract： Investigation of the dynamic response of reinforced concretecolumns under impact，relying on the two-degree-of-freedom mass-spring-damper model and combining with the OpenSees computing platform，on the basis of clarifying the equivalent resistance-displacement curve of reinforced concrete columns，a simplified impact analysis method for reinforced concrete columns integrating material nonlinearity and impact strain rate effects is proposed.By comparing with the drop hammer impact test ofreinforced concrete columns，the validity of the proposed two-degree-of-freedom simplified analysis method is verified.Onthis basis，the impacts of sensitive parameters like impact velocity，impact mass，axial compression ratio and longitudinal reinforcement ratio on the drop hammer impact response of reinforced concrete columns are explored.The results showed that the peak impact force calculated by the proposed simplified analysis method has a deviation of approximately 4.30% from the test value，and the deviation of the peak displacement at mid-span is approximately 2.16% . With the increase of the impact velocity and impact mass，the peak impact force and the peak displacement at the mid-span of the column gradually increased，but the increase of the impact velocityand impact masswould lead toa delayed characteristic of the peak displacementat the mid-span of the column.With the increase of the axial compresionratio and the longitudinalreinforcement ratio，the peak impact force of the column gradually increased， while the peak displacement at the mid-span showed a gradually decreasing trend. Moreover，the change of the longitudinal reinforcement ratio had a significantly greater influence on the secondary impact in the impact force time history curve than the change of the axial compression ratio.

Key words： reinforced concrete columns; impact dynamic response; mass-spring-damper model; simplified analysis

Citation format：RENL，F(xiàn)ANG Z， ZHENG S P.Simplified analysis on impact dynamic response of reinforced concrete columns[J]. Journal ofEast China Jiaotong University，2025，42（3）： 22-30.

作為橋梁的主要受力和傳力構(gòu)件，墩柱在服役過(guò)程中可能面臨車(chē)輛、船舶、落石及漂浮物等外物的撞擊風(fēng)險(xiǎn)[1-3]。（剩余11566字）