系船柱基础预埋锚栓采用钻孔植筋工艺,因锚栓直径较大,锚固承载力检验值达到830 k N,常规的锚杆拉拔设备及检验技术难以对此类大直径锚栓的施工质量进行抗拉拔检验。受基桩竖向抗拔承载力检验方法的启发,采用基桩静载荷测试分析系统对...系船柱基础预埋锚栓采用钻孔植筋工艺,因锚栓直径较大,锚固承载力检验值达到830 k N,常规的锚杆拉拔设备及检验技术难以对此类大直径锚栓的施工质量进行抗拉拔检验。受基桩竖向抗拔承载力检验方法的启发,采用基桩静载荷测试分析系统对大直径锚栓进行抗拉拔检验。在实际工程中共检测56根大直径锚栓,其中54根锚固承载力合格,2根在加荷过程中锚固破坏,锚栓被拔出,施工质量检验效果良好。展开更多
The potential of externally applied FRP （fiber-reinforced plastic） sheets, being employed in retrofitting schemes aimed to repair and strengthen RC （reinforced concrete） structural elements damaged by prototype st...The potential of externally applied FRP （fiber-reinforced plastic） sheets, being employed in retrofitting schemes aimed to repair and strengthen RC （reinforced concrete） structural elements damaged by prototype strong earthquakes, is presented and discussed in this study. The limitation of the debonding mode of failure of these FRP sheets is highlighted and the necessity to develop efficient anchoring devices for these FRP sheets is underlined. The behavior of such a novel HAD （hybrid anchoring device） capable of anchoring CFRP （carbon fiber reinforcing plastic） sheets to RC structural elements, is presented and discussed. The behavior of the device itself was studied through a 3D non-linear numerical simulation at the preliminary design stage in order to establish certain desired features such as the ductile behavior of the device itself as well as the satisfactory performance of the FRP sheets wrapped around this device. This HAD was next applied as part of a strengthening scheme aimed to upgrade the flexural capacity of an RC bridge-type pier specimen subjected to a cyclic seismic-type loading sequence. The obtained results demonstrated an increase in the specimen＇s flexural capacity by 100% as well as a similar increase in its capability of dissipating energy in a ductile manner during the cyclic load sequence. Moreover, the employed 3D non-linear numerical simulation yielded reasonably good agreement between the measured and the predicted cyclic response of this specimen strengthened by CFRP layers, which were anchored by the novel HAD. The successful behavior of this novel HAD, which has been patented with No. WO2011073696, is currently being tried with a number of other retrofitting schemes employing FRP sheets externally attached on RC structural elements.展开更多
文摘系船柱基础预埋锚栓采用钻孔植筋工艺,因锚栓直径较大,锚固承载力检验值达到830 k N,常规的锚杆拉拔设备及检验技术难以对此类大直径锚栓的施工质量进行抗拉拔检验。受基桩竖向抗拔承载力检验方法的启发,采用基桩静载荷测试分析系统对大直径锚栓进行抗拉拔检验。在实际工程中共检测56根大直径锚栓,其中54根锚固承载力合格,2根在加荷过程中锚固破坏,锚栓被拔出,施工质量检验效果良好。
文摘The potential of externally applied FRP （fiber-reinforced plastic） sheets, being employed in retrofitting schemes aimed to repair and strengthen RC （reinforced concrete） structural elements damaged by prototype strong earthquakes, is presented and discussed in this study. The limitation of the debonding mode of failure of these FRP sheets is highlighted and the necessity to develop efficient anchoring devices for these FRP sheets is underlined. The behavior of such a novel HAD （hybrid anchoring device） capable of anchoring CFRP （carbon fiber reinforcing plastic） sheets to RC structural elements, is presented and discussed. The behavior of the device itself was studied through a 3D non-linear numerical simulation at the preliminary design stage in order to establish certain desired features such as the ductile behavior of the device itself as well as the satisfactory performance of the FRP sheets wrapped around this device. This HAD was next applied as part of a strengthening scheme aimed to upgrade the flexural capacity of an RC bridge-type pier specimen subjected to a cyclic seismic-type loading sequence. The obtained results demonstrated an increase in the specimen＇s flexural capacity by 100% as well as a similar increase in its capability of dissipating energy in a ductile manner during the cyclic load sequence. Moreover, the employed 3D non-linear numerical simulation yielded reasonably good agreement between the measured and the predicted cyclic response of this specimen strengthened by CFRP layers, which were anchored by the novel HAD. The successful behavior of this novel HAD, which has been patented with No. WO2011073696, is currently being tried with a number of other retrofitting schemes employing FRP sheets externally attached on RC structural elements.
