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1·The simplified expression of plastic hinge is presented on the basis of existing equations.

综合比较梁、柱的塑性铰公式，建立简化塑性铰长度表达式；

2·The position of plastic hinge will effect the direction and ability of moment redistribution.

预应力框架中塑性铰形成的位置不同，弯矩重分布的方向和能力也不相同。

3·Studies indicate that the connection with welded haunch shifts plastic hinge away from the face of the column.

加腋型节点的塑性铰在远离柱翼缘面的梁上形成。

4·In order to improve the inadequacy of the current strut model, a more reasonable model is applied based on the mid-strut plastic hinge theory.

针对目前杆件力学模型存在的不足，基于杆中部塑性铰模型的思想提出了一个更加合理的力学模型。

5·According to capacity design philosophy, brittle shear failure inside ductile members must be inhibited, to insure adequate rotation capacity of the plastic hinge.

按照能力设计思想，必须防止延性构件内部发生脆性剪切破坏，以确保塑性铰的转动能力。

6·The fixed end behaves as a plastic hinge, and the plastic region near the point where the concentrated load acts is developing, while that near the fixed end unloading.

固支端保持为塑性铰，集中荷载作用点附近塑性区扩展而固支端附近塑性区卸载阶段。

7·The negative plastic hinge line in the plate was evaluated by using variational approach, then an equation for calculating the ultimate load carrying capacity was developed.

首先利用变分原理确定板的负塑性铰线方程，继而推导出极限承载力的表达式。

8·The loci of plastic hinge line and the maximum load during first roof weighting are determined by using kinematical method, and the minimum span of roof key stratum is derived.

利用机动法确定了老顶岩板初次来压时载荷的上限值和塑铰线的位置，得到了顶板岩体关键层的最小破断跨距。

9·With the help of plastic hinge theory and collapse theory, the formulas for calculating strength failure load and the method for computing collapse load were established respectively.

分别利用塑性铰理论和压溃理讨论了强度计算问题，提出了强度承载能力计算公式和压溃荷载计算方法。

10·By summarizing domestic actual anti-seismic design method, steel of high-performance for anti-seismic is needed to achieve beam plastic hinge collapse mechanism which is required in the code.

通过对我国现行抗震设计方法的简要概述，得出为了实现规范要求的钢框架梁铰倒塌机制，需要使用抗震性能好的钢材。