Composite members and hybrid systems are to be widely used in the high-rise buildings to make full use of structural steel and concrete. By employing the steel reinforced concrete (SRC) wall system, structural engineers expect to obtain the increase of stiffness, strength, ductility and fire resistance capacity; the compact cross-section of high-rise systems; and the reduction of construction cost and time. Due to the deficiencies in the present codes and in the research base, however, better rules for determining shear carrying capacity of SRC walls are needed. This paper is focusing on the tests and formulations of SRC coupled walls (SCW) and SRC tubes (ST). Three 1/5 scaled specimens of SCW were tested under cyclic loading and constant axial force, while three ST specimens were subjected to reversed loading without axial force. These specimens were measured with the time history and observed failing in shear. The formulae of ultimate shear strength of SCW and ST were then established on the basis of the shear-bearing mechanism analysis of RC structural walls. Predictions of shear strength from the proposed method are compared with experimental results. Taking the safety margin of the design into consideration, formulae of SRC walls proposed here are suitable for the implementation in a code of practice.

This paper presents a comprehensive investigation on viscous wall dampers (VWD) used for seismic response mitigation of reinforced concrete (RC) frames. First, a shaking table test on a large-scaled three-story RC frame with VWD and another identical three-story RC frame without any dampers was carried out. A total of three types of earthquake excitations were inputted to the shaking table to evaluate the effects of VWD on seismic response mitigation. The influence of different earthquake input intensities on seismic performance of VWD were also examined. From the experiment, this paper further assessed the performance of VWD on seismic retrofitting of a partly damaged RC frame. The test results show that the main effect of installing VWD is to provide a large amount of supplemental damping to the RC frame, and at the same time the stiffness of the structure is also raised moderately as an accessorial effect. As a result, the displacement responses of the RC frame can always be reduced significantly, while the acceleration responses and the base shear of the RC frame were reduced in some test cases, but increased in other cases. The test results of seismic retrofit also show that seismic responses of the damaged RC frame can be alleviated evidently by the installation of VWD and, therefore, installing VWD is an effective retrofitting approach for RC frames. After test investigation, elastic and inelastic seismic responses of the RC frame were numerically simulated using finite element software Sap2000 and Canny99, respectively. A good agreement of experimental results and analysis results verified the analytical method and model used for RC structures with VWD.

本文根据振动台模型试验的经验，介绍了模拟地震振动台试验设计的实用流程和设计思路；提出了不用明确求出π数表达式的似量纲分析法，来求解各相似常数；并阐明考虑模型混凝土强度和钢筋强度之间采用不同的相似系数的原则以及模型设计中的一些注意事项。

In China, the irregular high-rise buildings are beconung more extensive. Considering the irregularities and complexities of these buildings, it is significant to verify the safety and rationality of their seismic design through effective means including small scale dynamic model tests, refined numerical analysis and large scale joint tests. The target building of this paper is Shanghai International Design Center (SHIDC), which has two different-height connected towers designed by Japanese Architect Tadao Ando. The hybrid system of reinforced concrete core walls in conjunction with perimeter steel frames is out of Chinese code in the plan and elevation layouts. Thus, scaled model was carefully tested on the shaking table to obtain the weak position, dynamic characteristics, inter-story drift, and shear force of the structure. A linear dynamic analysis by ETABS was performed to compare, check, and support the experimental results. On the basis of those results, the seismic performance of the complex irregular structure was evaluated and the suggestions to the same type of structural design were given.

为解决在钢筋混凝土结构、钢结构的振动台试验模型中，相似理论与实际模型设计之间的差异问题，以实现对原型结构合理模拟进行的研究，针对不同材料结构按构件等效设计的原则，分别得到钢筋混凝土结构、钢结构模型的设计计算公式，并给出计算实例，以指导振动台试验模型设计。