With the change of the main influencing factors such as structural configuration and impact conditions,reinforced concrete slabs exhibit different mechanical behaviors with different failure patterns,and the failure m...With the change of the main influencing factors such as structural configuration and impact conditions,reinforced concrete slabs exhibit different mechanical behaviors with different failure patterns,and the failure modes are transformed.In order to reveal the failure mode and transformation rule of reinforced concrete slabs under impact loads,a dynamic impact response test was carried out using a drop hammer test device.The dynamic data pertaining to the impact force,support reaction force,structural displacement,and reinforcement strain were obtained through the use of digital image correlation technology(DIC),impact force measurement,and strain measurement.The analysis of the ultimate damage state of the reinforced concrete slab identified four distinct types of impact failure modes:local failure by stamping,overall failure by stamping,local-overall coupling failure,and local failure by punching.Additionally,the influence laws of hammerhead shape,hammer height,and reinforcement ratio on the dynamic response and failure mode transformation of the slab were revealed.The results indicate that:(1)The local damage to the slab by the plane hammer is readily apparent,while the overall damage by the spherical hammer is more pronounced.(2)In comparison to the high reinforcement ratio slabs,the overall bending resistance of the low reinforcement ratio slabs is significantly inferior,and the slab back exhibits further cracks.(3)As the hammer height increases,the slab failure mode undergoes a transformation,shifting from local failure by stamping and overall failure by stamping to local-overall coupling failure and local failure by punching.(4)Three failure mode thresholds have been established,and by comparing the peak impact force with the failure thresholds,the failure mode of the slab can be effectively determined.展开更多
In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation...In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation mathematical model of fluid-structure interaction(FSI)was developed.Then,the transfer matrix method(TMM)was used to calculate the modal frequency,modal shape and frequency response.The results were compared with that in experiment to verify the correctness of the TMM and the results show that the fluid-structure coupling has a greater impact on the modal frequencies than the modal shape.Finally,the influence on the response spectrum of different damping ratios was studied and the results show that the natural frequency under different damping ratios has changed little but there is a big difference for the pressure spectrum.With the decreasing of damping ratio,the damping of the system on frequency spectrum is more and more significant and the dispersion and dissipation is more and more apparent.Therefore the appropriate damping ratio should be selected to minimize the effects of the vibration of the FSI.The results provide references for the theory research of FSI in the transient process.展开更多
泵站、长距离供水等有压输水系统中,精准、高效的水力计算对于系统水力安全、智慧调控至关重要。然而,现有的水锤计算大多基于稳态摩阻假定,低估了水锤衰减;尤其是采用的特征线法因插值计算或调整波速,常会引起计算误差。为了精准、高...泵站、长距离供水等有压输水系统中,精准、高效的水力计算对于系统水力安全、智慧调控至关重要。然而,现有的水锤计算大多基于稳态摩阻假定,低估了水锤衰减;尤其是采用的特征线法因插值计算或调整波速,常会引起计算误差。为了精准、高效地模拟水锤问题,构建了Urbanowicz and Zarzycki简化加权类动态摩阻水锤模型,采用二阶Godunov格式进行模型求解,并设计搭建了水锤试验台,将所建模型计算结果与Zielke模型、Brunone模型、传统的特征线法结果、试验结果进行对比分析。结果表明,所建模型可以精准仿真水锤压力的波动峰值与周期,与试验结果基本吻合;Zielke模型与所建模型具有基本一致的计算精度,纳什效率系数可达0.94,但Zielke模型计算耗时量巨大;Brunone模型计算效率略优于所建模型,但计算精度较差,纳什效率系数为0.87;当库朗数小于1时,特征线法会出现严重的数值耗散,而本文模型仅有轻微的数值衰减。可见,所建模型提供了一种精准、高效、稳定的水锤模拟方法。展开更多
基金Supported by the National Natural Science Foundation of China(Grant No.52078283)Shandong Provincial Natural Science Foundation(Project No.ZR2024MA094)。
文摘With the change of the main influencing factors such as structural configuration and impact conditions,reinforced concrete slabs exhibit different mechanical behaviors with different failure patterns,and the failure modes are transformed.In order to reveal the failure mode and transformation rule of reinforced concrete slabs under impact loads,a dynamic impact response test was carried out using a drop hammer test device.The dynamic data pertaining to the impact force,support reaction force,structural displacement,and reinforcement strain were obtained through the use of digital image correlation technology(DIC),impact force measurement,and strain measurement.The analysis of the ultimate damage state of the reinforced concrete slab identified four distinct types of impact failure modes:local failure by stamping,overall failure by stamping,local-overall coupling failure,and local failure by punching.Additionally,the influence laws of hammerhead shape,hammer height,and reinforcement ratio on the dynamic response and failure mode transformation of the slab were revealed.The results indicate that:(1)The local damage to the slab by the plane hammer is readily apparent,while the overall damage by the spherical hammer is more pronounced.(2)In comparison to the high reinforcement ratio slabs,the overall bending resistance of the low reinforcement ratio slabs is significantly inferior,and the slab back exhibits further cracks.(3)As the hammer height increases,the slab failure mode undergoes a transformation,shifting from local failure by stamping and overall failure by stamping to local-overall coupling failure and local failure by punching.(4)Three failure mode thresholds have been established,and by comparing the peak impact force with the failure thresholds,the failure mode of the slab can be effectively determined.
文摘In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation mathematical model of fluid-structure interaction(FSI)was developed.Then,the transfer matrix method(TMM)was used to calculate the modal frequency,modal shape and frequency response.The results were compared with that in experiment to verify the correctness of the TMM and the results show that the fluid-structure coupling has a greater impact on the modal frequencies than the modal shape.Finally,the influence on the response spectrum of different damping ratios was studied and the results show that the natural frequency under different damping ratios has changed little but there is a big difference for the pressure spectrum.With the decreasing of damping ratio,the damping of the system on frequency spectrum is more and more significant and the dispersion and dissipation is more and more apparent.Therefore the appropriate damping ratio should be selected to minimize the effects of the vibration of the FSI.The results provide references for the theory research of FSI in the transient process.
文摘泵站、长距离供水等有压输水系统中,精准、高效的水力计算对于系统水力安全、智慧调控至关重要。然而,现有的水锤计算大多基于稳态摩阻假定,低估了水锤衰减;尤其是采用的特征线法因插值计算或调整波速,常会引起计算误差。为了精准、高效地模拟水锤问题,构建了Urbanowicz and Zarzycki简化加权类动态摩阻水锤模型,采用二阶Godunov格式进行模型求解,并设计搭建了水锤试验台,将所建模型计算结果与Zielke模型、Brunone模型、传统的特征线法结果、试验结果进行对比分析。结果表明,所建模型可以精准仿真水锤压力的波动峰值与周期,与试验结果基本吻合;Zielke模型与所建模型具有基本一致的计算精度,纳什效率系数可达0.94,但Zielke模型计算耗时量巨大;Brunone模型计算效率略优于所建模型,但计算精度较差,纳什效率系数为0.87;当库朗数小于1时,特征线法会出现严重的数值耗散,而本文模型仅有轻微的数值衰减。可见,所建模型提供了一种精准、高效、稳定的水锤模拟方法。
