延性

Keywords:moment-resisting steel frames; structural influencing coefficient; ductility; overstrength; inelastic time history analysis

关键词］抗弯钢框架；结构影响系数；延性；超强；弹塑性时程分析方法

It is suggested to reduce earthquake actions, that is to say, R=3.5. According to statistical processing and analysis of 23 examples, variation regularities of structural coefficient, ductility coefficient, overstrength coefficient and displacement amplification coefficient are acquired.

通过对23组算例统计分析，研究层数、跨度、竖向恒载和跨数对结构影响系数、延性系数、超强系数以及位移放大系数的影响规律。

Involving effects of the number of stores and spans on structural ductility and overstrength capability, the structural influencing coefficient values are determined for moment-resisting steel frames under the action of the typical seismic wave.

考虑了结构层数、跨数等对结构延性和超强能力的影响，给出了在典型地震波作用下的各结构的结构影响系数值。

Three ductility degrees and corresponding force modification factors for different structure types are suggested in foreign seismic codes,and take into account overstrength factor varied.

国外多数抗震设计规范对各种类型结构建议了3档延性等级和地震力调节系数的可选择方案，并考虑了不同程度的超强，通过对我国9度区3跨6层钢筋混凝土框架结构进行的非线性动力反应分析，结果表明，赋予不同屈服水准的框架结构具有相近的超强水准。

Account overstrength coefficient which varies from structure type,ductility degree and degree of statical indeterminacy,and suggest smaller overstrength coefficient for these systems which have lesser degree of statical indeterminacy.

根据结构类型、延性等级以及结构的超静定次数的不同考虑了不同程度的超强，并对超静定次数偏少的结构采用偏低的地震力降低系数。

Three ductility degree s and corresponding force modification factors for different structure types are suggested in foreign seismic codes,and take into account overstrength factor varied.

国外多数抗震设计规范对各种类型结构建议了3档延性等级和地震力调节系数的可选择方案，并考虑了不同程度的超强，通过对我国9度区3跨6层钢筋混凝土框架结构进行的非线性动力反应分析，结果表明，赋予不同屈服水准的框架结构具有相近的超强水准。

The main works by this paper are as followings: In allusion to the concentrically braced frame, we make use of the STS program to design structure, after pushover analyzing with the program of SAP2000, through iteration and finally solve the structural influencing coefficientare, displacement coefficient, ductility coefficient and overstrength coefficient, then analyze the homologous variety regulation.

本文研究的主要内容如下：基于现行抗震设计规范，针对V型中心支撑钢框架，采用STS进行结构设计，借助于Sap2000程序进行Pushover静力推覆，通过迭代法求解了结构的结构影响系数、位移放大系数、超强系数、延性系数，并分析相应的变化规律。

The story drift can be represented by the drift of a typical beam/column sub-assemblage. Introducing the plastic deformation distribution factor x as a parameter, the relations among x, displacement ductility ratio μ〓 and column overstrength factorη〓, i. e. the x－μ〓－η〓 equations are presented.

提出用框架节的侧移要求来等效框架的层间位移要求，引入塑性变形分布因子x的概念，建立了x与位移延性系数μ〓、强柱系数η〓之间的关系，即x-μ〓-η〓关系。

Adopting the model of uniform load and triangular load separately,MRFs of different story numbers and bay numbers are analyzed by static Pushover analytical method,and the global capacity envelopes are obtained.Then,through a method for establishing the inelastic demand spectrum of design intensity and rare intensity based on elastic spectrum of seismic design code for buildings,the structural target displacement of design intensity and rare intensity are estimated by improved capacity spectrum method.The corresponding structural ductility reduction factor,the overstrength factor,the structural influencing coefficient and displacement amplification factor are determined.

分别采用水平均匀分布力和倒三角分布力加载模式对不同层数和跨数的钢框架结构进行了静力推覆分析，并得到了结构的能力曲线，在此基础上，应用改进的能力谱法，以规范反应谱为基础建立设防烈度和罕遇烈度下的弹塑性需求谱，确定出结构在设防烈度和罕遇烈度下的目标位移，进而求解出结构的延性折减系数、超强系数、结构影响系数和位移放大系数等参数；同时，分析了不同加载模式、层数和跨数等对各系数的影响。

Based on some principal rules of brittle rocks polyaxial tests and previous researches, three controlling failure types for brittle rock are obtained. The first type represents the brittle failure controlled by extension microcrack under the condition of lower hydrostatic pressure; the second represents the ductile failure controlled by friction sliding action under the condition of higher hydrostatic pressure when microcrack is close; and the third represents brittle-ductile failure type controlled by multiple factors mentioned above under the condition of high hydrostatic pressure when some microcracks are open and others are close.

通过分析脆性岩石多轴试验中的强度和破坏规律，在已有研究成果基础上，将其强度和破坏控制类型主要归结为3种：类型1，低静水压力时裂缝张开扩展，主要表现为张性微裂缝控制型脆性破坏；类型2，静水压力很高时，裂缝闭合，主要表现为摩擦滑移控制型延性破坏；类型3，处于两者之间时，微裂缝一部分张开，一部分闭合，主要表现为两者复合控制型脆延破坏。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失