Applied Mechanics and Materials Vols. 94-96

Abstract: To study the effect of transverse stiffness on the mechanical behavior of reinforced concrete rigid-frame arch bridge, an integral model was set up by using the spatial finite element analysis software, four different spans rigid frame arch bridges were analyzed and the influence of transverse load distribution coefficients on different deck stiffness was studied. Compared with the results of deflection method, it shows that the transverse load distribution coefficient calculated by elastically supported continuous beam method is smaller; also, the transverse stiffness is directly related to the magnitude of transverse load distribution of the bridge and a serious difference of the forces calculated with traditional design theory, which should be modified in the design.

Abstract: After determining the height of rectangular extended foundation that meeting punching shear, if the height is larger, the foundation may be divided into two or three steps. The height and width of each step is divided average generally, I think that this method is not appropriate through analyzing, the minimum plane size of upper step can be get through direct solving, all the size that is greater than the minimum plane size can meet the punching shear requirements of step, a program based on MATLAB is worked out for everyone to use.

Abstract: This paper collects earthquake damage data and research on tunnel in recent years(Wenchuan earthquake,Ms 8.0;Yushu earthquake, Ms 7.1, Chi-Chi Earthquake,Ms 7.6 and so on). Damage patterns and characteristics of mountain tunnels in severe earthquake region are classified: Slope failure near tunnel portal; Spalling and collapse of tunnel portal and end wall; Lining collapse; Longitudinal and transverse cracks of lining; Slant and transverse fracture of lining; Sheared off lining in fault region; Steel frame damage of primary support; pavement or bottom cracks. The damage mechanisms are analyzed and some proposals are put forward for tunnel rehabilitation and new tunnel construction: It is suggested that in strong earthquake areas, a comprehensive aseismic design should be conducted considering tunnel portal structure and slope. Line selection should avoid or reduce passing through active faults and avoid placing tunnels too close to slope faces when planning future tunnels. The paper provides a reference for seismic design and construction procedures of tunnel.

Abstract: Load-carrying system of reinforced concrete structure on construction is different from load-carrying system on service life. This temporary load-carrying system is composed of shores and concrete members of early age on construction. Geometrical model and material property of structure are time-varying on construction. Through secondary development of ANSYS, the processes of placing concrete and removing shore are simulated on construction. Critical effect factors are determined through the analysis on mechanical property of temporary load-carrying system, such as shore stiffness, foundation stiffness and diurnal temperature difference. Results of analog calculation to temporary load-carrying system will provide basis for shoring system design and structure reliability analysis on construction.

Abstract: Clay brick generated from construction project sites is usually delivered to landfills for disposal and thus they can damage environment. The use of crushed clay brick can solve the environmental problem. This paper presents the possible use of crushed clay brick as a construction material. This new material gathered from some construction project sites in Iran is used as 100% aggregate in the production of concrete. The results indicated that the crushed clay brick reduced the unit weight and compressive strength of concrete, and increase the water absorption value. This new concrete can be used in non-structural products.

Abstract: In order to study the seismic performance of the concrete sandwich panel structure,design a 1:2.8 scale model, an experiment was conducted, in which the low cyclic reversed load was applied to the model . The results such as the failure forms, hysteresis curve, stiffness degradation and ductility are analyzed. The test results indicate that the mechanical properties of the structure model is similar with shear wall; the failure pattern is the destruction of the weak parts;a good seismic and energy dissipation behavior. Finally, set up a finite element model, do the preliminary analysis.The result reveals that it is coincide with the expermiental study in terms of capacity,so the finite element method can be used stimulate structure to analyzed and calculated.

Abstract: The problem that the large span steel pedestrian bridge has a too large vertical amplitude is very common in every major cities. This document analyzes the problem and finds out the cause of the problem , which is the first frequency of pedestrian bridge is very close to the people walking frequency , and leading to the occurrence of resonance. To avoid resonance, this document proposes the optimal design scheme

Abstract: Structural health monitoring system for high-rising buildings is a new structural effort that tries to make proper maintaining strategy to extend structural life of the building by collecting structural performance data under normal loads as well as severe weather conditions. This paper introduces the monitoring items of Shanghai Tower.

Abstract: Bicycle Stadium in Jinan Olympic Sports Center adopts spatial truss structure with steel tube. The design and analysis of the roof structure are introduced in detail. By applying the program SAP2000 and STCAD, the static and dynamic properties of the roof structure are obtained. In addition, the design of the cast steel support joint are studied, which focuses on analyzing the static behavior of the typical cast steel support by using the program ANSYS. The results prove that the spatial truss structure is reasonable, which can satisfy the requirements of safety of the building. For the complex support joints subjected to large reaction forces, cast steel support joints can meet the architectural and structural requirements. The research results in this paper can provide references for the design of similar engineering.

Abstract: Aimed at the human comfort problem with cantilevered floors arising from normal human activities, the Tuned Mass Dampers are used to control the vibration of the steel cantilevered floors which span 16.3m. Based on studies on the dynamic characteristics of the overall structure, with the position of TMDs optimized and the parameters set reasonably, the vertical vibration response of the cantilevered floors under different cases of pedestrian walking loads is calculated. The results show that the TMD system can effectively reduce the dynamic response of the cantilevered floors, in order to meet the requirements of human comfort.