To investigate the temperature field and residual bearing capacity of the sandwich wall panels with GFRP skins and a wood-web core under a fire,three sandwich walls were tested.One of them was used for static load tes...To investigate the temperature field and residual bearing capacity of the sandwich wall panels with GFRP skins and a wood-web core under a fire,three sandwich walls were tested.One of them was used for static load test and the other two for the one-side fire tests.Besides,temperature probe points were set on the sandwich walls to obtain the temperature distribution.Meanwhile,the model of the sandwich wall was established in the finite element software by the method of core material stiffness equivalent.The temperature distribution and performance reduction of materials were also considered.The residual bearing capacity of specimens after fire exposure were simulated considering the effects of web spacing,wall panel thickness and fire exposure time.Because the sandwich wall panels were stressed by eccentric compression after a fire,the residual compressive strength of the wall panel after the fire can be calculated through the eccentric loading analysis.Compared with the numerical results,it can be concluded that the effectiveness of calculation method of residual bearing capacity after fire exposure was proved.展开更多
In this article,several spectral models describing the stationary stochastic process of earthquake ground motion are explored and compared.The Hu-Zhou spectrum,which is regarded as an improved model of the Kanai-Tajim...In this article,several spectral models describing the stationary stochastic process of earthquake ground motion are explored and compared.The Hu-Zhou spectrum,which is regarded as an improved model of the Kanai-Tajimi spectrum,is concerned.It is proven that the earthquake-induced ground acceleration process described by the Hu-Zhou spectrum is a twice filtered white noise process in essence,and two filters for modifying low-frequency components and moderate-and high-frequency components respectively are investigated.A total of 1946 strong earthquake records at different sites were employed to determine the parameters of spectral models,including the Kanai-Tajimi spectrum,the Clough-Penzien spectrum and the Hu-Zhou spectrum.The results showed that the Hu-Zhou spectrum fits well with the actual observed ground motions over the whole frequency range,and that it is not only distinct in physical meaning and concise in mathematical expression,but also reasonable in practice.展开更多
文摘To investigate the temperature field and residual bearing capacity of the sandwich wall panels with GFRP skins and a wood-web core under a fire,three sandwich walls were tested.One of them was used for static load test and the other two for the one-side fire tests.Besides,temperature probe points were set on the sandwich walls to obtain the temperature distribution.Meanwhile,the model of the sandwich wall was established in the finite element software by the method of core material stiffness equivalent.The temperature distribution and performance reduction of materials were also considered.The residual bearing capacity of specimens after fire exposure were simulated considering the effects of web spacing,wall panel thickness and fire exposure time.Because the sandwich wall panels were stressed by eccentric compression after a fire,the residual compressive strength of the wall panel after the fire can be calculated through the eccentric loading analysis.Compared with the numerical results,it can be concluded that the effectiveness of calculation method of residual bearing capacity after fire exposure was proved.
基金the partial support of the Joint Research Fund for Earthquake Science launched by the National Natural Science Foundation of China and China Earthquake Administration(Grant No.U2039208)Postgraduate Research&Practice Innovation Program of Jiangsu Province(Grant No.KYCX22_1322).
文摘In this article,several spectral models describing the stationary stochastic process of earthquake ground motion are explored and compared.The Hu-Zhou spectrum,which is regarded as an improved model of the Kanai-Tajimi spectrum,is concerned.It is proven that the earthquake-induced ground acceleration process described by the Hu-Zhou spectrum is a twice filtered white noise process in essence,and two filters for modifying low-frequency components and moderate-and high-frequency components respectively are investigated.A total of 1946 strong earthquake records at different sites were employed to determine the parameters of spectral models,including the Kanai-Tajimi spectrum,the Clough-Penzien spectrum and the Hu-Zhou spectrum.The results showed that the Hu-Zhou spectrum fits well with the actual observed ground motions over the whole frequency range,and that it is not only distinct in physical meaning and concise in mathematical expression,but also reasonable in practice.
