静力荷载

In present research, the extremal ice force and dynamic ice force are the main ice force.

目前在对冰荷载的研究上，主要有极值静冰力和交变冰力两种。

Impact buckling which has few study findings relatively. So some viewpoints have not been consistent. Systematic study is made on dynamic buckling of axial compression member under impact load in this paper for that reasons.

动力屈曲问题由于时间参数的引入相比静力屈曲问题要复杂得多，特别是对冲击荷载作用下的动力屈曲问题尤甚，研究成果相对较少，对许多问题的认识尚未达成一致。

Second, dynamic buckling condition is erected after analysis of perfect axial compression member with different boundary conditions, by which dynamic buckling critical load and corresponding buckling modal are obtained. These indicate the difference between dynamic buckling and static one.

其次，通过对不同边界条件理想轴心受压构件进行分析，建立动力屈曲条件，获得了动力屈曲临界荷载及相应屈曲模态，表明了动力屈曲与静力屈曲的差异。

A theoretical model was developed based on the relation between hysteresis coefficient of strain in the steel and degradation of bond strength, for the load bearing capacity of corroded RC beams. The model reflects the mechanical characteristics and failure mechanism of the beam under static and repeated loading.

通过研究腐蚀梁中钢筋应变滞后系数与粘结强度退化比的关系，建立静荷载和重复荷载下与腐蚀梁的受力特征和破坏机理相一致的承载力计算模型。

This paper is based on the former research taking the No.1 Tong-Lv Bridge as an example; the large universal finite element program Midas/Civil is adopted, a three-dimensional finite element model is established. The static performance, the comparative analysis of influence surfaces, the experimental study and the analysis of a local finite element model of the new style three-span continuous through type bow-string arch bridge is made. With these studies, this paper is aimed at revealing the performance of this kind of construction.

本文在前人研究的基础上，以通吕一号桥为背景，采用空间有限元法对结构形式新颖的三跨连续下承式系杆拱桥的静力性能、影响面比较分析、实桥荷载试验、局部节点分析等进行研究，旨在深入理解该结构形式桥梁的力学性能，为今后相同结构体系桥梁的结构分析提供可以参考的建议。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。