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Xin R.,Xian University of Architecture and Technology | Xin R.,Central Research Institute of Building and Construction | Yao J.,Xian University of Architecture and Technology
World Information on Earthquake Engineering

According to the general laws of the earthquake damage phenomenon, three typical kinds of failure modes of multi-story masonry wall, i.e. window belly wall, window pier wall and mixed of the two and damage distribution were proposed. The characters of three different failure modes were analyzed and comparative study on seismic performance of structure with various failure modes was carried out. In respect to seismic behavior, the masonry structure with window belly wall is better than that with windew pier wall The shortcomings of the masonry structures design method expounded in current design codes of China were put forward which may provide a reference to the improvement and amendment of the current codes. Source

Xin H.,Central Research Institute of Building and Construction | Zhou X.,China Academy of Building Research
World Information on Earthquake Engineering

Liquefaction of low plasticity fine soils is observed during past earthquakes. It shall bear in mind at investigating seismic safety of engineering site that evaluation of liquefaction potential is carried out of the fine soils and the effective measure of liquefaction mitigation is taken. Based on recent earthquake discovery and research developments, the liquefaction criteria are suggested of the fine-grained soils to Chinese code for seismic design of buildings. Source

He Z.-Q.,Central Research Institute of Building and Construction | He Z.-Q.,China JingYe Engineering Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering

This project is one of the largest scale foundation pits in the central city of Beijing, and its depth is 15 m and floor area is 33000 m2. Many unidentified underpasses and caves are densely distributed, many line pipes with the maximum depth of 9.0 m exist along with the major road just beside the west side of the pit, and three first-class national protection trees are standing just beside the top fringe of the pit. For the protection of rare trees, the design takes the wind load into consideration and the support system is made up of shoring piles and two rows of prestressed anchors, and necessary watering is arranged to satisfy their growth needs, this method ensures the safety of those valuable trees. For the support system at the west side is the soil nailing wall of 7.0 m at the upper and shoring piles together with one row of anchors at the lower part, anchors are located on the capping beams and their angles are adjusted to avoid the 9 m-depth pipeline. For other areas the anchored soil nailing wall is successfully fulfilled with special treatments for all the possible underpasses and caves which may cause water flush during the raining period. The above methods are of some significance for similar foundation pits involved with issues about protection of adjacent trees and intricate underground circumstances. Source

Zhou C.,Beijing Jiaotong University | Zhou C.,Tongji University | Bai X.,Beijing Jiaotong University | Zhao F.,Central Research Institute of Building and Construction | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures

To study the axial compressive performance of circular concrete short columns strengthened with lateral pre-stressed fiber reinforced polymer (FRP), 25 specimens were manufactured and tested under axial compression. The main factors considered in the experiment included concrete strength, cross section size, spacing of stirrup, initial damage and surface treatment of the specimens, pre-stressing level, type and layers of FRP. The failure mode and the stress-strain curve of each specimen were obtained from the experiment and the impact on confining effect of various factors was analyzed. Experimental results show that the strength and ductility of circular concrete columns strengthened with lateral pre-stressed FRP can be improved significantly relative to the un-strengthened specimen, the stress hysteresis of lateral FRP can be avoided by pre-stressing, and the high strength of FRP can be better used. When the pre-stressing of lateral FRP within 0~0.20 times of its ultimate tensile strength, the strength and ductility of specimens increase with the increase of lateral FRP's pre-stressing. The strengthening effect will be reduced when the pre-stressing of lateral FRP reacheds 0.25 times of its ultimate tensile strength. So the pre-stressing of lateral FRP should be controlled within 0~0.20 times of its ultimate tensile strength in practice. Source

Qin S.,Wuhan University | Han D.,Central Research Institute of Building and Construction | Xu J.,Wuhan University | Liao H.,Wuhan University
Journal of Geomatics

In order to improve the accuracy of foundation pit settlement prediction, the paper, according to the characteristics of foundation pit deformation, builds reverse accumulative gray model based on the GM(1, 1) model. Combined with characteristics of accumulative sequences in opposite-direction, the paper puts forward a kind of GOM (1, 1) model whose integral parameter, initial value and background value are optimized at the same time, to improve the prediction results. In the end, an application is given to demonstrate that the optimized GOM (1, 1) model can improve the prediction precision of the foundation pit deformation, which proves the practicability and effectiveness of the optimized model. Source

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