预应力网架结构的简捷计算法及施工张拉全过程分析

本文引入初内力的概念，提出并建立初内力准则方程式来简化分析计算预应力网架结构。这种简捷计算法在分析各种预应力工况时，只要一次性建立、分解和应用网架的总刚度矩阵，使计算工作量大为简化。当单根杆件施加预应力、多根杆件施加预应力、同一杆件各股分别施加预应力以及分级分批施加预应力时，采用本文提出的方法可方便求得各工况下预加应力全过程的网架内力和变位及其变化规律，并可一次性地完成预应力施加工作。文中附有多个算例，计算结果表明，本文提出的简捷计算法是正确、可靠和有效的。

A Simple Computation Method of Prestressed Space Truss and Its Global process Pretensioning Analysis

Based on a definition of preliminary internal force, a simple computation method of prestressed space truss is put forward in this paper by means of establishing a criterion equation of preliminary internal force. Using this method, the global stiffness matrix is established, decomposed and applied only once so as to greatly reduce the calculating work. Furthermore, the internal forces and displacements when pretensioning the structure can be obtained easily by means of the suggested method under many conditions such as pretensioning a tendon, pretensioning several tendons simulta neously, pretensioning one strand in a tendon or pretensioning tendors by stages and in groups. In this paper, several examples are presented and proved that proposed method is correct, reliable and effective.