本文提出了双重抗震结构体系，并讨论了其抗震设计原则。论文介绍了经受95 年神户大地震的一个双重抗震结构工程实例。对基于双重抗震概念提出的一种新型剪力墙的抗震性能进行了试验研究。在基于单自由度体系的非线性动力分析，研究了双重抗震结构体系的设计参数。

双功能带缝剪力墙是根据抗震控制概念提出的一种新型剪力墙，为了解其受力性能，并为进一步的试验研究参数确定提供依据，本文利用有限元方法，对双功能带缝剪力墙进行了弹性受力分析，研究了双功能带缝剪力墙在弹性受力阶段的性能、受力特点和连接键参数的影响。分析结果表明，双功能带缝剪力墙在弹性阶段具有一定整体工作，侧移刚度可比开缝墙明显提高。同时分析还表明，在连接键总长相等的情况下，设置多个短的连接键对提高墙体侧移刚度和实现“双功能”控制作用更为有效。根据分析结果，本文提出了双功能带缝剪力墙在弹性阶段的侧移刚度计算公式

本文从结构抗震设计方法的发展历史，总结了结构抗震性能与结构抗震能力的关系，以及抗震性能指标之间的关系，建议以承载力和能综合反映结构滞回耗能和损伤的等效延性系数（位移）作为抗震性能设计指标。随后又进一步讨论了抗震设防水准与结构抗震性能需求之间的关系。根据能力设计方法的概念，研究了具有多道抗震防线结构的性能、抗震设防水准和地震位移反应模式，指出将多道抗震防线概念、能力设计方法与位移模式结合的基于性能/位移抗震设计方法，可更易把握结构的抗震性能和性能目标的确定，从而易于实现基于性能／位移抗震设计方法。

利用阻尼耗能是减小结构地震反应的有效方法。根据振动等能量准则，由地震动力能量方程推导了具有不同阻尼的单自由度（SDOF）弹性体系的地震最大位移反应与结构阻尼比的关系。与地震动力时程数值分析方法计算得到的结果对比表明：本文理论分析结果较好地反映SDOF结构的实际最大地震位移反应。对于在地震动特征周期处产生类共振时阻尼减震效果更为显著的现象，从一般能量准则进行了分析说明。利用振动等能量准则方法可较为 简便地确定阻尼减震结构体系的最大位移反应，且可进行减震设计。

本文根据近年来国内外高强混凝土的研究成果，总结了高强混凝土有关强度指标的换算关系，建议了用于正截面承载力计算的高强混凝土受压应力-应变曲线。采用所建议的关系和曲线分析了高强混凝土构件的正截面承载力，提出了应力-应变曲线参数的取值。在此基础上，进一步给出了等效矩形应力图形系数。

本文根据国内外对钢骨混凝土结构的研究，介绍了钢骨混凝土结构的发展和特点，钢骨与混凝土的共同工作，梁、柱构件的正截面和斜截面受力性能、刚度和裂缝、抗震性能及其有关计算理论，梁柱节点的受力性能和适合我国工程应用的梁柱节点连接构造形式及试验研究，还介绍了钢骨混凝土结构在我国的工程应用情况。

Seven specimens were tested to investigate shear strength of reinforced concrete columns strengthened by wrapping carbon fiber reinforced plastic sheet. All specimens were tested under lateral reversal cyclic loading and a constant axial load. The main parameters considered were CFRP sheet amount, shear span/depth ratio and axial load ratio. Many strain gauges were attached to CFRP sheet to obtain its shear contribution. It was found that the shear behavior of RC part of the strengthened column was almost the same as that of the unstrengthened one. The parameters were found to have an influence on the shear contribution of CFRP sheet, which could be explained by truss-arch shear resistance mechanism. A simple superposition method is suggested to calculate the shear strength of the strengthened column, in which a shear coefficient (ν) is proposed to evaluate the shear contribution of CFRP sheet based on the test results. The calculated results of suggested method are shown to be in reasonable agreement with test ones.

A new type of passive controlled RC shear wall, called dual function slitted shear wall (DFW wall), was proposed by the first author. DFW wall is formed by setting connectors in the vertical slits of RC slitted wall. DFW wall can provide larger stiffness and strength than RC slitted wall under small and moderate earthquake, and performs a ductile flexure failure as RC slitted wall with the failure of connectors under severe earthquake. Experimental studies to investigate the seismic behaviors of DFW wall, including seven wall specimens and thirteen connector specimens, were introduced firstly in this paper. Then an analytical model was proposed to calculate the full skeleton load-displacement relation for DFW wall. The analysis results were found agree well with test ones. A dual seismic structure model was used to study the dynamic response of DFW wall using time history analysis method. The experimental research and analysis demonstrated the dual control functions, and showed that DFW wall has better seismic performance than the corresponding slitted shear wall.

Eight specimens, including two strengthened after loaded to yield level to imitate strengthening with some damage and one strengthened under a sustained axial load to imitate strengthening under service condition, were tested under constant axial load and lateral cyclic load to investigated seismic performance of RC columns strengthened with carbon fiber reinforced polymer sheet (CFRP sheet). The ductility increment with the confinement of CFRP sheet was studied by the strain development and distribution of CFRP sheet. Based on the experimental results, a confinement factor of CFRP and an equivalent transversal reinforcement index were suggested. Thus, the seismic design method of current Chinese seismic design code for RC column can be directly used in determining seismic strengthening amount of CFRP sheet.

Based on the visual graphical procedure of capacity spectrum method (CSM), a new method, called capacity-demand curves method (CDCM), is proposed for performance/displacement seismic design in this paper. The new method can be drawn from CSM but could avoid its disadvantages in difficult determination of demand point and larger error induced for long period system. Then the method is developed to determine the seismic performance/displacement including damage degree of structures and the corresponding probability under multiple earthquake hazard levels. All the procedures are presented in illustrative format which are easy to be understood and the values are easy to be determined. The demand curves, reflecting the relations of elastic and inelastic response, are based on the suggestion of R-μd relations in previous studies, and comparison of different models is discussed.