scholarly journals Numerical simulation of RC frames infilled with RC walls for seismic strengthening of existing structures

Author(s):  
Elpida Georgiou ◽  
Nicholas Kyriakides ◽  
Christis Z. Chrysostomou
2017 ◽  
Vol 143 (10) ◽  
pp. 04017144 ◽  
Author(s):  
Changhai Zhai ◽  
Xiaomin Wang ◽  
Jingchang Kong ◽  
Shuang Li ◽  
Lili Xie

2021 ◽  
Vol 248 ◽  
pp. 113261
Author(s):  
Sajad Veismoradi ◽  
Seyed Mohamad Mahdi Yousef-beik ◽  
Pouyan Zarnani ◽  
Pierre Quenneville

2013 ◽  
Vol 438-439 ◽  
pp. 829-833
Author(s):  
Long Chen ◽  
Xi Hua Chu ◽  
Yuan Jie Xu

The construction of underground infrastructures often requires to excavate in close vicinity of existing structures. In these conditions, the main design requirement is that of limiting ground deformations caused by excavation to ensure the safety of the structure. The diaphragm wall was used to meet this requirement on the background of a hydropower station in China. In this paper, a series of 3D finite element analyses was carried out for modeling the installation of diaphragm walls based on ABAQUS. The contact pair between the wall, the pile and soil was built by the master-slave method. The elastic model is adopted for the diaphragm wall and the pile, the elastic-plastic model based Mohr-Coulomb was applied to soil. The construction process and the running state were also simulated to estimate whether the plan was appropriate while considering the initial ground stress. The results obtain by numerical simulation agree with the observed data, the deformation process can be satisfactorily modeled. So this simulation method of the diaphragm wall can be used as reference for similar hydraulic projects.


2013 ◽  
Vol 479-480 ◽  
pp. 1175-1179
Author(s):  
Hee Cheul Kim ◽  
Jung Woo Park ◽  
Jin Young Park ◽  
Young Hak Lee ◽  
Dae Jin Kim

The effects of earthquakes can be devastating especially to existing structures that are not based on earthquake resistant design. This study proposes a steel grid shear wall that can provide a sufficient lateral resistance and can be used as a seismic retrofit method. An experiment was performed on reinforced concrete (RC) frames with and without the steel grid shear wall proposed in this study. These frame specimens were subjected to combined axial and cyclic lateral loads that were applied by using two actuators with a maximum capacity of 500 kN and a single actuator with a maximum capacity of 2,000 kN, respectively. The experimental results showed that the RC frame specimen with the proposed shear wall retained high lateral strength and ductility.


2021 ◽  
Vol 13 (4) ◽  
pp. 1864
Author(s):  
Vincenzo Manfredi ◽  
Giuseppe Santarsiero ◽  
Angelo Masi ◽  
Giuseppe Ventura

In Italy as well as in other earthquake-prone countries, the large number of existing buildings requiring seismic retrofitting calls for sustainable solutions able to reduce both costs and downtime. To this purpose, in this paper, the High-Performance Dissipating Frame system (HPDF), a new strengthening solution for the seismic rehabilitation of existing buildings, is presented. HPDF is based on external precast reinforced concrete (RC) frames rigidly connected to the existing structures and equipped with shear damper devices in order to provide high dissipation capacity. The proposed solution permits: (i) to increase sustainability through works made up from the outside without removing/demolishing infills/other non-structural components, (ii) rapid execution by adopting precast resisting members mutually restrained with steel connections, and (iii) effectiveness due to shear damper devices able to dissipate a large amount of shaking energy. In the paper, a displacement-based design procedure is proposed and applied to a numerical example.


Author(s):  
Wu Ke ◽  
Zhang zheng ◽  
Li Shuchen ◽  
Zhou leisheng ◽  
Zhao Jiahui ◽  
...  

AbstractIt is inevitable for the construction of subways to pass under the existing structures in the city; this will cause settlement of the existing structures and affect their safety. The soil is a complex mixture, and hence it is difficult to determine the damage caused by construction using tunnel boring machine (TBM) method to the stress balance of the surrounding soil. Normally, settlement and uplift of the surface are caused during tunneling. Therefore, large-scale 3D simulations are needed to study the interaction between mechanically driven tunnel construction and the surrounding soil to estimate the expected settlement and related damage risks to the existing structures, especially in tunnel construction in urban areas. Qingdao Metro Line 1 in the Haixiao section (Xiaocunzhuang and Haiboqiao stations) was taken up as the research object to study the trend and degree of the effect of TBM tunnel construction using the numerical simulation software Midas GTS NX. The numerical simulation results and measured data were used for the reliability analysis to study the influence of different digging speeds and pressures in TBM construction on ground subsidence, and the effect of vibrations generated at the tunnel face by the TBM cutter head on the ground structure. It is shown that when other factors remain unchanged, the faster the driving speed, the smaller the ground settlement; the higher the surrounding rock pressure, the smaller the ground settlement. The vibration of the ground structure caused by the TBM cutter head complies with the relevant specifications. During construction, the driving parameters should be selected suitably depending on the available budget.


2021 ◽  
Author(s):  
Wu Ke ◽  
Zheng Zhang ◽  
Chen Shu Li ◽  
Sheng Lei Zhou ◽  
Hui Jia Zhao ◽  
...  

Abstract It is inevitable for the construction of subways to pass under the existing structures in the city; this will cause settlement of the existing structures and affect their safety. The soil is a complex mixture, and hence it is difficult to determine the damage caused by construction using tunnel boring machine (TBM) method to the stress balance of the surrounding soil. Normally, settlement and uplift of the surface are caused during tunneling. Therefore, large-scale 3D simulations are needed to study the interaction between mechanically driven tunnel construction and the surrounding soil to estimate the expected settlement and related damage risks to the existing structures, especially in tunnel construction in urban areas. Qingdao Metro Line 1 in the Haixiao section (Xiaocunzhuang and Haiboqiao stations) was taken up as the research object to study the trend and degree of the effect of TBM tunnel construction using the numerical simulation software Midas GTS NX. The numerical simulation results and measured data were used for the reliability analysis to study the influence of different digging speeds and pressures in TBM construction on ground subsidence, and the effect of vibrations generated at the tunnel face by the TBM cutter head on the ground structure. It is shown that when other factors remain unchanged, the faster the driving speed, the smaller the ground settlement; the higher the surrounding rock pressure, the smaller the ground settlement. The vibration of the ground structure caused by the TBM cutter head complies with the relevant specifications. During construction, the driving parameters should be selected suitably depending on the available budget.


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