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Seismic Design Of Reinforced Concrete And Masonry Buildings

The safety and stability of roadways is greatly influenced by the complex geological conditions present in the Sanmenxia Bauxite Mine, Henan Province, China. In this study, based on data from field survey, advanced detection methods, numerical studies, and monitoring studies, we have adopted the method of steel fiber-reinforced shotcrete to improve the excavation rate of roadways and guarantee the safety of the tunnel when it passes through unfavorable geological bodies, such as shale rocks and broken argillaceous limestone. Field surveys showed that the stability of roof rocks is the major problem faced by engineers; however, tunnel construction using cast-in-situ concrete, which is the method currently applied, costs too much time, resulting in an excavation rate that is too slow to meet the requirements of the Sanmenxia Bauxite Mine. Here, we propose an optimized scheme which, when combined with numerical simulations and data from advanced detection techniques and field monitoring surveys, can improve the efficiency of roadway roof support. During the implementation of the new scheme, the geological anomalies ahead of the working face were detected in advance. It is assumed that the supporting effect of the steel fiber-reinforced shotcrete is equivalent to that of the cast-in-situ concrete as long as a certain thickness is reached. Moreover, the steel fiber-reinforced shotcrete has better mechanical properties than cast-in-situ concrete and achieves a better combination effect with surrounding rock masses. Based on geological conditions and numerical results, the shotcrete should be thickest in the middle area along the roadway axis passing through the unfavorable geological bodies, and gradually become less thick from the middle to both ends. Field tests were carried out to verify the effectiveness of the scheme. The monitoring results show that the roadway passing through broken argillaceous limestone was stable after being supported by shotcrete (at least 80 mm); its thickness should reach at least about 120 mm when passing through shale rock mass. The results indicate that the use of steel fiber-reinforced shotcrete can considerably shorten the construction time compared with cast-in-situ concrete support. The scheme has proved to be a feasible, economical, and time-saving method for underground excavation in the Sanmenxia Bauxite Mine.

The stability and roof-support optimization of roadways passing through unfavorable geological bodies using advanced detection and monitoring methods, among others, in the Sanmenxia Bauxite Mine in China’s Henan Province

Towards probabilistic forecasting of flash floods: The combined effects of uncertainty in radar-rainfall and flash flood guidance

Seismic response and shear mechanism of engineered cementitious composite (ECC) short columns

In-plane seismic behavior of autoclaved aerated concrete block masonry walls retrofitted with high ductile fiber-reinforced concrete

Replacement of existing unreinforced masonry (URM) walls, commonly used as a non-structural member in apartments, with new reinforced concrete (RC) components has been used as a reliable method when remodeling is carried out. However, special care needs to be taken when URM walls are removed not to waste construction time and materials. Therefore, retrofitting existing URM walls can be deemed a better solution rather than replacing URM walls with RC ones. Using shotcrete is one of retrofitting techniques of URM walls. However, using normal shotcrete cannot improve adequate ductility and may cause brittle failure at a wall frame or slab connection. Therefore, new materials, such as engineered cementitious composite (ECC) and ultra-high performance concrete (UHPC) have emerged to resolve the problem of normal shotcrete by increasing ductility and toughness of retrofitting materials. In this study, sprayed ECC was used to increase both strength and ductility of existing URM walls. The results of two retrofitted URM walls under lateral quasi-static loading were compared to non-retrofitted one. One strengthened wall, retrofitted masonry wall (RTM)-ECC, was just sprayed and anchored to a wall base. Another strengthened wall, RTM-ECC-WM, was the same as RTM-ECC except for addition of wire mesh. The retrofitted specimens showed significant increase of strength, ductility, and energy dissipation capacity in comparison with the control one. In addition, RTM-ECC-WM indicated higher strength degradation due to the load transferring effect of wire mesh than RTM-ECC.

Lateral Resistance of Unreinforced Masonry Walls Strengthened With Engineered Cementitious Composite

Experimental study on the cyclic behavior of steel fiber reinforced high strength concrete columns and evaluation of shear strength

Sung-Joo Yoon 1)·Jonghwan Son2)·Hyeongjun Park2)·Junghoon Seo2)· Yoojin Lee2)·Seunghwan Ban3)·Jae-Seung Choi4)·Byung-Guk Kim5)·Hyun jik Lee6)· Kyu-sung Lee5)·Ki-Eok Kweon7)·Kye-Dong Lee8)·Hyung-sup Jung9)·Yun-Jae Choung10)· Hyun Choi11)·Daesung Koo12)·Myungjin Choi13)·Yunsoo Shin14)·Jaewan Choi15)· Yang-Dam Eo16)·Jong-chul Jeong17)·Youkyung Han18)·Jaehong Oh19)· Sooahm Rhee20)·Eunmi Chang21)·Taejung Kim 5) 22)†

CAS 500-1/2 Image Utilization Technology and System Development: Achievement and Contribution

Evaluation of punching shear strength of voided slabs considering the effect of the ratio b0/d

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Hyun Choi

Papers

Lateral Resistance of Unreinforced Masonry Walls Strengthened With Engineered Cementitious Composite

Experimental study on the cyclic behavior of steel fiber reinforced high strength concrete columns and evaluation of shear strength

CAS 500-1/2 Image Utilization Technology and System Development: Achievement and Contribution

Evaluation of punching shear strength of voided slabs considering the effect of the ratio b0/d

Comparative Analysis of Generalized Intersection over Union and Error Matrix for Vegetation Cover Classification Assessment