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| Study on dynamic coefficient of beam members with linear hardening resistance model under blast load |
| Received:March 14, 2023 Revised:May 06, 2023 |
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| DOI：10.7511/jslx20230314002 |
| KeyWord:linear hardening resistance model blast load dynamic coefficient ductility ratio beam member |
| Author | Institution |
| 耿少波 |
中北大学 环境与安全工程学院, 太原 ;长安大学 公路大型结构安全教育部工程研究中心, 西安 |
| 韩晓丹 |
中北大学 环境与安全工程学院, 太原 |
| 牛艳伟 |
长安大学 公路大型结构安全教育部工程研究中心, 西安 |
| 韩云山 |
中北大学 环境与安全工程学院, 太原 |
| 马林林 |
中北大学 环境与安全工程学院, 太原 |
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| Abstract: |
| The ideal elastic-plastic resistance model is used extensively in the calculation of dynamic coefficients for beam members subjected to blast load.This conventional model restricts the refined analysis of blast resistant beam members with linear hardening resistance.In order to determine the dynamic coefficient of beam members with linear hardening resistance,according to the numerical relationship between resistance hardening coefficient and damping ratio,the analytical solutions of the dynamic coefficient based on the ductility ratio of flexible and rigid beam members are derived in three cases.The results of finite element analysis and specification comparison show that the derived theoretical formula has high accuracy and similar trend to the calculation results from blast resistant design specification formula.When the ductility ratio is 1,the hardening coefficient of resistance is independent of the dynamic coefficient.When the ductility ratio is greater than 1 and the hardening coefficient is less than 0.01,the influence of the hardening coefficient can be ignored.When the ductility ratio is greater than 2,the damping parameter should be considered in the beam blast resistant design analysis.When the ductility ratio is greater than 3 and the hardening coefficient is greater than 0.1,the linear hardening resistance model has better economic benefits. |
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