钢筋砼框架结构1/10模型的三维振动台试验研究

A 1/10 scale model of reinforced conorete (R.C.) frame structure was tested on the 15t-shaking table of State Key Laboratory, Tongji University. The structural prototype was a 10-storey office building that was damaged in the 1985 Mexico major earthquake[1]. The original acceleration records in the earthquake were applied as the input waves In the test. The dynamical test model was designed according to the general law of similarity, and the effect of the shortage of artificial quality was considered. The model was carefully made of fine gravel concrete and galvanized iron wire. The damage of test model is in good agreement with that of archetypal building in the experiment.     

汶川地震震害对建筑结构设计提出的思考

结合汶川地震震害调查报告会及对汶川地震中建筑物震害的资料研究,分析汶川地震中砌体、框架、砌体——钢筋混凝土混合结构3种结构体系的震害特点和震害原因,探讨这3种结构体系的抗震性能,总结了一些经验和教训,在此基础上,提出了建筑结构抗震设计中应注意的问题和改进建议,供实际工程设计参考。     

Shaking Table Test on Out-of-Plane Stability of Infill Masonry Wall

The behaviors of infill wall in earthquakes show that infill masonry walls,which are used as nonstructural elements of concrete frames,are vulnerable when they are subjected to earthquake.In order to achieve an optimal antiseismic behavior,or even stability,two methods of connection are investigated.The shaking table tests,with 1:3 scale walls of two-storey model subjected to horizontal earthquake loads,were carried out to investigate the out-of-plane behaviors with different connections between walls and beams.The test results show that the connection methods employed between walls and beams have a significant effect on the out-of-plane stability of infill walls.The walls bound by bars with the beams perform better than those with inclined bricks without gaps.     

Earthquake Analysis for the System of RC Building with a Steel Tower

The damping ratios of RC buildings and steel tower are 0. 05 and 0. 01 respectively, so a steel tower topping an RC building comprises a non-proportional damping system[1,2]. Due to the difficulty of dynamic analysis for non-proportional damping systems[3-5] , these systems are usually simplified as proportional damping ones with equivalent damping ratio. The equivalent damping ratio takes a value more than 0.01 and less than 0. 05. To compare the results calculated using the non- proportion…     

狠抓文化建设 创建文化名城

一个现代化的城市不仅要重视物质建设,更重要的是重视文化建设,才能成为和谐文明的文化名城。为把唐山打造成文化名城,文章从发扬抗震精神,建设文化人才的培养基地,重视本地文化名人的培养和待遇,形成文化精品产出机制,以及提高市民的文化素质五个方面进行分析,给出了具体实施措施。     

试论延性钢筋混凝土框架结构的设计要点及其意义

钢筋混凝土抗震结构不仅要满足强度要求,还必须满足延性要求。建筑结构的延性是保证建筑物在受到地震力、风力等荷载的作用下具有一定的耗能能力、产生可控塑性变形破坏、避免突然脆性破坏的主要条件。文章介绍了框架结构概念设计和延性设计的意义,通过分析多次震害框架结构破坏特点,提出了延性设计的一些思路和方法。     

Elastic-plastic study on high building with SRC transferring story

INTRODUCTION Due to the increasing number of building story braced by transferring member during development of high or superhigh rise buildings, and the many de-mands and restrictions on floor height and space in architecture, it is necessary to use steel reinforced concrete (SRC) materials in transferring structure. SRC has high bearing capacity, good stiffness and relatively less section dimension, and ductility, dura-bility and aseismic behavior better than that of rein-forced concre…     

裂纹尺寸对混凝土断裂韧度的影响

利用断裂力学方法对含有裂纹混凝土试件的断裂韧度进行了研究。通过预制不同裂纹深度的混凝土试件,采用三点弯曲试验方法对含裂纹混凝土梁的断裂韧度进行实验,同时利用ABAQUS软件,采用最大主应力牵引损伤开裂准则与线性软化损伤模型进行数值模拟。结果表明,实验结果和数值模拟比较一致,最大误差不超过15%,当初始缝纹长度为40~120 mm时,起裂断裂韧度KiniIC变化幅度较小,失稳断裂韧度KunIC有明显的减小趋势。     

Torsional effect of space structure in frequent earthquakes

Taking a concrete frame supporting space structure as the research object, we systematically studied its lateral-torsion coupling effect of reverse problems in consistent earthquake excitation. Firstly, based on its reverse forms and features, we put forward a mechanical analysis model (flexibility layer model) and a calculation method using the response spectrum method and the weighted average method, and verified their validity and feasibility using case analysis. The result shows that the translation displacement change trend of the space structure is basically the same whether reverse exists in the supporting structure or not, but the supporting structure torsion has an effect on the displacement with a relative increase of 10?.     

建筑结构抗震的发展及前景展望

地震是一种危害性极大的自然灾害。地震造成的惨重人员伤亡和巨大的财产损失，主要是由建筑物的破坏所引起。抗震就是和地震这种自然灾害进行斗争。本文通过对抗震设计理论，抗震试验，抗震设计原则阐述，并讲述了我国建筑结构抗震的现状，探讨了建筑结构抗震在二十一世纪的发展趋势。     

Static and dynamic damage analysis of mass concrete in hydropower house of Three Gorges Project

This paper establishes a 3D numerical model for 15# hydropower house of the Three Gorges Project (TGP) and performs a nonlinear static and dynamic damage analysis. In this numerical model, a coupling model of finite and infinite elements for simulating infinite foundation of hydropower station is adopted. A plastic-damage model based on continuum damage mechanics, which includes the softening and damage behavior under tension is considered for the concrete material. The dynamic equilibrium equations of motion are solved by using the HilberHughes-Taylor (HHT) time integration method. Firstly, the static damage response analysis of the hydropower station is conducted due to high tensile stress resulting from large water head and diameter of an inlet pipe. Then, on the basis of static simulation, the dynamic damage analysis of hydropower house subjected to earthquake motion is simulated. Numerical results show that under large water head and diameter of an inlet pipe of the project, the damages are mainly located near the top of the spiral case from the inlet section to the 0° section; under combined loadings of static loads and earthquake, the damages of the concrete surrounding the spiral case increase insignificantly; however, some damages occur on the side walls of the main powerhouse.     

东日本大地震对避难所规划和建设的启示

东日本大地震给日本和全世界带来了巨大灾难。一方面从震后灾民避难生活暴露出的城镇避难所规划与建设的隐患和不足中汲取教训,另一方面日本救灾体制健全,建筑物抗震性能高,国民防灾意识强．大量建设避难场所,重视防震减灾及相关学科的科研工作等,都为我国地震避难所的规划和建设提供了一些有益的启示。     

基于地震灾害防控的图书馆建筑研究

图书馆的基本功能是传播科学知识和传承历史文化。本文主要通过研究图书馆建筑抗震性弱的原因及给人们带来的生命财产损失为切入点,具体分析和构建基于地震灾害防控的新型抗震图书馆建筑模式。防震与抗灾结合的图书馆观念对图书馆建筑的设计理念将产生越来越重要的影响。     

Occupant friendly seismic retrofit by concrete plates

Abstract： An innovative occupant friendly retrofitting technique has been developed for reinforced concrete （RC） building structures with hollow brick infill wails used as partition walls which constitute the major portion of the existing building stock in Turkey. The idea is to convert the existing hollow brick infill wall into a load carrying system acting as a cast-in-place RC wall by reinforcing it with relatively thin concrete plates bonded to the mortar coated infill wall by use of tile adhesive and fixed by qb6 （6 mm diameter） bolts. Test parameters were the shape and thickness of the plates, presence of reinforcement in plates, number and arrangement of O6 bolts. It was observed that lateral strength, stiffness, energy dissipation capacity, and ductility of the strengthened infill walls were improved and behaviour was enhanced by the proposed technique. Plates with two different basic shapes were used to strengthen the test specimens.     

Temporal variation in modal properties of a base-isolated building during an earthquake

Temporal variation of dynamical modal properties of a base-isolated building is investigated using earthquake records in the building. A batch processing least-squares estimation method is applied to segment-wise time-series data. To construct an input-output system, an auto-regressive model with exogenous input （ARX） of second-order including a forgetting coefficient as a weighting coefficient is used for the estimation of modal parameters. The fundamental and second natural frequencies and the damping ratios of the fundamental and second natural modes of the base-isolated building are identified in the time domain. The identified results are consistent with the results obtained from the micro-tremor vibration data, forced-vibration test data and earthquake records in the present base-isolated building in the case of taking into account the amplitude-dependency of the iso- lators and viscous dampers. It is finally pointed out that several factors, e.g., amplitude dependency of the isolator and damper system and special characteristics of the series-type viscous damper system, may be related complicatedly with the temporal variation in modal properties of the above-mentioned system.     

混凝土单轴抗压强度尺寸效应的数值模拟

采用随机骨料模型模拟混凝土的细观结构，利用有限元方法数值模拟混凝土试件单轴抗压的细观损伤断裂，并重点对单轴抗压强度尺寸效应进行研究。     

典型矮塔斜拉桥地震风险概率评估方法研究

鉴于矮塔斜拉桥受力性能的特殊性,引入增量动力分析（IDA）和拉丁超立方体抽样（LHS）评估该结构在地震激励下发生损伤的风险概率。首先采用LHS考虑桥梁构件材料的随机性,与事先选取的地震波相结合形成桥梁-地震动样本集合;其次在确定桥梁有限元模型主要构件损伤指标的基础上采用基于蒙特卡罗（MC）抽样的IDA进行地震易损性分析和地震风险概率评估。为验证方法的正确性和有效性,对一预应力混凝土独塔双索面矮塔斜拉桥结构模型进行地震风险概率评估,结果表明:该方法既充分考虑了材料和地震输入双重随机性又避免了繁琐的积分过程,同时也提高了工程计算的效率及精度。     

混凝土单轴抗压强度尺寸效应的数值模拟

采用随机骨料模型模拟混凝土的细观结构,利用有限元方法数值模拟混凝土试件单轴抗压的细观损伤断裂,并重点对单轴抗压强度尺寸效应进行研究。     

地震动特性及引起的结构破坏机理浅析

地震是一种破坏性极强的自然灾害, 本文以近年来部分地震震害的实例,对地震动特性以及地震动作用下引起结构的破坏进行分析, 以便进行结构抗震概念设计.     

提高村镇建筑抗震设防能力的基本对策

本文通过分析目前村镇建筑在抗震设防方面存在的诸多问题,从规划、设计、管理等几方面提出了基本满足现阶段抗震防灾需要,又切实可行的对策和措施,对村镇建设有一定的借鉴意义。