建筑英文期刊及中英文翻译(2)

5.结论 验证结果与实验室试验结果尽可能相同。本研究结果可总结如下：

该nlfea最终阶段使用的宇宙是有限元软件对三

（二）修改边界条件，通过分配约束在x方向的所有板的边缘，完全约束在墙底端被认为是适当的，在创造一个双曲率剖面预计在筒中筒模型。

（三）nlfea在筒中筒建筑表现良好，使用非线性混凝土应力-应（一）季度模型具有非线性行为到极限状态。

维模型地变曲线多达32步的非线性和产量的最终行为高层建筑。 进行了成功修改。够捕获所了。 有的非线性行为的负载进

展。然而， 一个完善的模型可

Proceedings of the 6th Asia-Pacific Structural Engineering and Construction Conference (APSEC 2006), 5 ?6 September 2006, Kuala Lumpur, Malaysia

（四）模型其中包括全配置的剪力墙，发现是适当的建模的筒

因此，行为的耦合光束成功地提出该系统能中筒高层建筑作为四分之一部分。

以进行有

限元参

数，从而

Abstract: The non-linear finite element analysis (NLFEA) has

usable and reliable means for analyzing of civil structures with the availability of computer technology. The structural behaviors and mode of failure of reinforced concrete tube in tube tall building via application of computer program namely COSMOS/M are presented. Three dimensional quarter model was carried out and the method used for this study is based on non-linearity of material. A substantial improvement in accuracy is achieved by modifying a quarter model leading deformed shape of overall tube in tube tall building to double curvature. The ultimate structural behaviors of reinforced concrete tube in tube tall building were achieved by concrete failed in cracking and crushing. The model presented in this paper put an additional recommendation to practicing engineers in conducting NLFEA quarter model of tube in tube type of tall building structures.

INTRODUCTION

NONLINEAR FINITE ELEMENT ANALYSIS OF REINFORCED CONCRETE TUBE IN TUBE OF

TALL BUILDINGS

Tube in tube concept in tall building had led to significant improvement in structural efficiency to lateral resistance. In its basic form, the system comprising a central core surrounded by perimeter frames which consists of closed spaced perimeter column tied at each floor level by spandrel beams to form a tubular structure. Usually these buildings are symmetrical in plan, and their dominant structural action take place in the four orthogonal frames forming the perimeter tube and in the central core (Avigdor Rutenberg and Moshe Eisenberger, 1983). Under the lateral load, a frame tube acts like a cantilevered box beam to resist the overturning moment and the central core acting like second tube within the outside tube. In order to get the more accurate result of analysis, the central core may be designed not only for gravity loads but also to resist the lateral loads. The floor structure ties the exterior and interior tubes together to make then act as a single unit and their mode of interaction depending on the design of floor system. No torsion effect was considered in this study, thus the floor system is effectively pin jointed to allow horizontal forces transmission before primary vertical structural elements of the building.

Combining shear wall and frame structures has proven to provide an appropriate lateral stiffening of tall building. As the shear wall deflects, shear and moments are induced in connecting beam and slabs which later induced axial forces in walls. The perimeter frame and the central wall act as a composite structure and deformed as in Figure 1. The lateral force is mostly carried by the frame in the upper portion of the building and by the core in the lower portion. The deflected shape has a flexural profile in the lower part and shear profile in the upper part. The axial forces causing the wall to shed the frame near the base and the frames to restrain the wall at the top.

The main purpose of this study is to predict the ultimate failure behavior of overall reinforced concrete tube in tube tall building. Hence, non-linear analysis has to be carried out in this study for better understanding of failure mode. Non linear analysis is a modelling of

structural behavior to the ultimate state while linear analysis is a conventional analysis that

does not pretend to be accurate (Aldo Cauvia, 1990). A sysmetrical tube in tube

reinforced A-161

Proceedings of the 6th Asia-Pacific Structural Engineering and Construction Conference (APSEC 2006), 5 ?6 September 2006, Kuala Lumpur, Malaysia

concrete tall building as shown in Figure 2, three dimensional (3D) quater model was

implemented with finite element analysis method and take into account material non linearity.

( a ) ( b ) ( c )

Figure 1 (a) Deform shape of frame; (b) Deform shape of shear wall; (c)Deformshapeofcombineframe+shearwall

METHOD OF ANALYSIS Description of Model

The NLFEA model is a 16 stories reinforced concrete tube in tube tall building with typical storey height of 3.50m except ground floor is 6.0m heights. The full tube model is symmetrical in both axes in plan. The internal tube 7.50m x 7.50m is surrounded by perimeter frame tube 22.50m x 22.50m. All perimeter columns were arrange closely spaced at 4.5m center to center with the size of 0.90m x 0.90m from ground floor up to level 10 and 0.75m x 0.75m column after level 10. The spandrel beams are dimensioned 250mm thick and 750mm depth and tied to the perimeter column to form a perimeter tube. The thickness for slab is 175mm and presumed to act as a horizontal diaphragm to transfer the lateral load as well as vertical loads. The internal tube is formed by square perforated shear wall with the thickness of 350mm and the coupling beam is kept similar as thickness of the shear wall with the depth of 1000mm. COSMOS/M 2.0 (64K Versio …… 此处隐藏：6590字，全部文档内容请下载后查看。喜欢就下载吧 ……