Advances in Civil Engineering, CEBM 2011

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Authors: Ai Fei Li, Si Hai Luo, Yue Gui
Abstract: During the Canister Retrieval Test (CRT), the temperature around the deposition hole DD0092G01 was elevated and the stress in the rock was consequently increased. This report concerns the study to investigate if the increased stress around the deposition hole has led to micro fracturing in the surrounding rock and if the temperature and possible heat induced damage can be predicted by numerical simulation.The temperature field from thermal analysis generally matches the measured results well, whereas the calculated temperature is much higher than measured.The damage analysis might be a quite reasonable simplification for the area near the middle height of the hole. For the other part, the influence due to tunnel excavation or the end effect should have more important influence.
Authors: Hong Zhang, Chun Ling Wang, Ai Qin Wang
Abstract: The analytic solutions of steady vibration of a rectangular plate loaded with vertical force on the semi-infinite elastic foundation were given by combining the general solution of double trigonometrically sine series with supplementary terms with the dynamic integral representations for displacements of the semi-infinite elastic foundation loaded with arbitrary vertical force. Some computational results were presented. The agreements were found to be satisfactory which proved the validity of the new method in solving the problem. This new method would be feasible in practical applications.
Authors: Hong Zhang, Xiao Hui Ren
Abstract: An Optimality Criteria method for topology optimization of continuum structures based on Solid Isotropic Material with Penalization (SIMP) was proposed. The minimum compliance of structures was selected as the objective function of the problem. A mathematical model for topology optimization design of statically loaded structures and the update scheme for the design variables were set. The examples showed that the algorithm has good convergence and application values.
Authors: Er Jun Wu, Jian Long Xing, Zhao Quan Zhu
Abstract: This paper develops a new-typed high-durability RC structures in which the steel stirrups are replaced by mesh stirrups weaved with soft high performance fiber belt. The experiments are carried out to investigate the shear property of six beams with soft aramid fiber mesh stirrups and one common RC beam and the results show that the failure state in the slope sections of the RC beams with fiber belt mesh stirrups is similar to the common RC beam. It was also found the shear property of beams with lean fiber mesh stirrups is better than that with vertical and horizontal mesh stirrups, and with the high-elastic- modulus fiber stirrups better than the low-elastic-modulus’s. In addition, the distributions of fiber stirrups strain at slope section are also observed. Based the experimental results, a model for beams with fiber mesh stirrups was established and the formula of shear bearing capacity was suggested.
Authors: Jin Qing Jia, Wei Qing Zhu, Gang Meng, Da Li Yao
Abstract: This paper proposes a new model to predict the horizontal shear strength of SRC, especially SRHC/SRUHC, beam-column connections on the basics of previous models developed for RC and RCS connections. The model divides the contributions to shear strength of a connection into three parts, the contribution of steel web, inner strut and outer strut. The predicted values coincide with experiment results very well, which proves that the model is suitable for SRC connections. It is found that the inner strut plays a dominant role in the strength mechanisms in SRC joints, so adequate web stiffeners in joints should be provided. It is the stirrups in a joint, rather than concrete strut, that usually determine how much contribution the outer strut mechanism provides to the joint.
Authors: Zhi Wei Chai, Qing Zhang, Ming Liu
Abstract: For the assembling adjustment of deck sheets in the frame construction block of the offshore platform, the optimized mathematical model is established oriented to reducing the overall error of steel structure based on transformation of coordinates and the least squares method. On the basis of measurement, a comprehensive analysis of column centerline offset, deck degree of level, the deck height request is conduct to guide deck sheet positioning and improve the accuracy of block installation. The critical error columns are identified by the error analysis to reduce the modified workload of the deck.
Authors: Guo Dong Zheng
Abstract: For un-cracked reinforced concrete beam with FRP, the adjusted effective modulus theory (AEMM theory) is applied and the calculation method of internal force and stress redistribution of various materials under creep is given with the transformed section method. A comparative analysis is carried out from height change of the concrete beams, reinforcement ratio, FRP layers and the initial stress. The stress of the bars and FRP will increase over time and the degree of increase will be more obvious with the height of the beam and the reinforcement increased, but the concrete stress will be reduced accordingly. The conclusion plays an important role for the performance evaluation of the long-term stress and deformation of concrete beam reinforced with FRP.
Authors: Arash Naderi, Mohammad Reza Sohrabi
Abstract: Using OBS (Off-center Bracing System) is one of the methods to make buildings resistant to the lateral Loads. This kind of brace has a great tendency to out of plane buckling. So, due to the lack of formal regulations, analyzing out of plane effective length of its members is important. In this paper, buckling load of 15 one-story frames is obtained and then out of plane effective length factor of the longer member is calculated. Finally, as buckling of one of the members causes the system to lose its stability, the mentioned effective length factor is introduced as out of plane effective length factor for all OBS members.

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